Staging: comedi: remove RT code

This removes the unused RT code from the comedi subsystem.

A lot of drivers needed to then include interrupt.h on their own, as they
were picking it up through the comedi_rt.h inclusion.

Cc: Ian Abbott <abbotti@mev.co.uk>
Cc: Frank Mori Hess <fmhess@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

48 files changed, 38 insertions, 1495 deletions

diff --git a/drivers/staging/comedi/Kconfig b/drivers/staging/comedi/Kconfig
index 0759c98f8e1c..86991f657900 100644
--- a/drivers/staging/comedi/Kconfig
+++ b/drivers/staging/comedi/Kconfig
@@ -13,13 +13,6 @@ config COMEDI_DEBUG
 	  This is an option for use by developers; most people should
 	  say N here. This enables comedi core and driver debugging.
 
-config COMEDI_RT
-	tristate "Comedi Real-time support"
-	depends on COMEDI && RT
-	default N
-	---help---
-	  Enable Real time support for the Comedi core.
-
 config COMEDI_PCI_DRIVERS
 	tristate "Comedi PCI drivers"
 	depends on COMEDI && PCI
diff --git a/drivers/staging/comedi/Makefile b/drivers/staging/comedi/Makefile
index afd1a19c1b87..05811f79d85b 100644
--- a/drivers/staging/comedi/Makefile
+++ b/drivers/staging/comedi/Makefile
@@ -1,5 +1,4 @@
 obj-$(CONFIG_COMEDI) += comedi.o
-obj-$(CONFIG_COMEDI_RT) += comedi_rt.o
 
 obj-$(CONFIG_COMEDI)	+= kcomedilib/
 obj-$(CONFIG_COMEDI)	+= drivers/
@@ -11,7 +10,3 @@ comedi-objs :=		\
 	drivers.o	\
 	comedi_compat32.o \
 	comedi_ksyms.o	\
-
-comedi_rt-objs :=	\
-	rt_pend_tq.o	\
-	rt.o
diff --git a/drivers/staging/comedi/comedi_fops.c b/drivers/staging/comedi/comedi_fops.c
index 9713fc746561..61b586477c10 100644
--- a/drivers/staging/comedi/comedi_fops.c
+++ b/drivers/staging/comedi/comedi_fops.c
@@ -1079,13 +1079,6 @@ static int do_cmd_ioctl(struct comedi_device *dev, void *arg, void *file)
 
 	comedi_set_subdevice_runflags(s, ~0, SRF_USER | SRF_RUNNING);
 
-#ifdef CONFIG_COMEDI_RT
-	if (async->cmd.flags & TRIG_RT) {
-		if (comedi_switch_to_rt(dev) == 0)
-			comedi_set_subdevice_runflags(s, SRF_RT, SRF_RT);
-	}
-#endif
-
 	ret = s->do_cmd(dev, s);
 	if (ret == 0)
 		return 0;
@@ -1720,12 +1713,6 @@ void do_become_nonbusy(struct comedi_device *dev, struct comedi_subdevice *s)
 	struct comedi_async *async = s->async;
 
 	comedi_set_subdevice_runflags(s, SRF_RUNNING, 0);
-#ifdef CONFIG_COMEDI_RT
-	if (comedi_get_subdevice_runflags(s) & SRF_RT) {
-		comedi_switch_to_non_rt(dev);
-		comedi_set_subdevice_runflags(s, SRF_RT, 0);
-	}
-#endif
 	if (async) {
 		comedi_reset_async_buf(async);
 		async->inttrig = NULL;
@@ -1952,8 +1939,6 @@ static int __init comedi_init(void)
 		}
 	}
 
-	comedi_rt_init();
-
 	comedi_register_ioctl32();
 
 	return 0;
@@ -1974,8 +1959,6 @@ static void __exit comedi_cleanup(void)
 
 	comedi_proc_cleanup();
 
-	comedi_rt_cleanup();
-
 	comedi_unregister_ioctl32();
 }
 
@@ -2015,15 +1998,8 @@ void comedi_event(struct comedi_device *dev, struct comedi_subdevice *s)
 
 	if (async->cb_mask & s->async->events) {
 		if (comedi_get_subdevice_runflags(s) & SRF_USER) {
-
 			if (dev->rt) {
-#ifdef CONFIG_COMEDI_RT
-				/* pend wake up */
-				comedi_rt_pend_wakeup(&async->wait_head);
-#else
-				printk
-				    ("BUG: comedi_event() code unreachable\n");
-#endif
+				printk("BUG: comedi_event() code unreachable\n");
 			} else {
 				wake_up_interruptible(&async->wait_head);
 				if (s->subdev_flags & SDF_CMD_READ) {
diff --git a/drivers/staging/comedi/comedi_ksyms.c b/drivers/staging/comedi/comedi_ksyms.c
index 6e6fb979ef54..a732e342dcd2 100644
--- a/drivers/staging/comedi/comedi_ksyms.c
+++ b/drivers/staging/comedi/comedi_ksyms.c
@@ -46,13 +46,6 @@ EXPORT_SYMBOL(range_bipolar2_5);
 EXPORT_SYMBOL(range_unipolar10);
 EXPORT_SYMBOL(range_unipolar5);
 EXPORT_SYMBOL(range_unknown);
-#ifdef CONFIG_COMEDI_RT
-EXPORT_SYMBOL(comedi_free_irq);
-EXPORT_SYMBOL(comedi_request_irq);
-EXPORT_SYMBOL(comedi_switch_to_rt);
-EXPORT_SYMBOL(comedi_switch_to_non_rt);
-EXPORT_SYMBOL(rt_pend_call);
-#endif
 #ifdef CONFIG_COMEDI_DEBUG
 EXPORT_SYMBOL(comedi_debug);
 #endif
diff --git a/drivers/staging/comedi/comedi_rt.h b/drivers/staging/comedi/comedi_rt.h
deleted file mode 100644
index cddd5406abfc..000000000000
--- a/drivers/staging/comedi/comedi_rt.h
+++ /dev/null
@@ -1,150 +0,0 @@
-/*
-    module/comedi_rt.h
-    header file for real-time structures, variables, and constants
-
-    COMEDI - Linux Control and Measurement Device Interface
-    Copyright (C) 1997-2000 David A. Schleef <ds@schleef.org>
-
-    This program is free software; you can redistribute it and/or modify
-    it under the terms of the GNU General Public License as published by
-    the Free Software Foundation; either version 2 of the License, or
-    (at your option) any later version.
-
-    This program is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    GNU General Public License for more details.
-
-    You should have received a copy of the GNU General Public License
-    along with this program; if not, write to the Free Software
-    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
-
-*/
-
-#ifndef _COMEDI_RT_H
-#define _COMEDI_RT_H
-
-#ifndef _COMEDIDEV_H
-#error comedi_rt.h should only be included by comedidev.h
-#endif
-
-#include <linux/kdev_t.h>
-#include <linux/slab.h>
-#include <linux/errno.h>
-#include <linux/spinlock.h>
-#include <linux/delay.h>
-#include <linux/interrupt.h>
-
-#ifdef CONFIG_COMEDI_RT
-
-#ifdef CONFIG_COMEDI_RTAI
-#include <rtai.h>
-#include <rtai_sched.h>
-#include <rtai_version.h>
-#endif
-#ifdef CONFIG_COMEDI_RTL
-#include <rtl_core.h>
-#include <rtl_time.h>
-/* #ifdef RTLINUX_VERSION_CODE */
-#include <rtl_sync.h>
-/* #endif */
-#define rt_printk rtl_printf
-#endif
-#ifdef CONFIG_COMEDI_FUSION
-#define rt_printk(format, args...) printk(format , ## args)
-#endif /* CONFIG_COMEDI_FUSION */
-#ifdef CONFIG_PRIORITY_IRQ
-#define rt_printk printk
-#endif
-
-int comedi_request_irq(unsigned int irq, irq_handler_t handler,
-		unsigned long flags, const char *device,
-		struct comedi_device *dev_id);
-void comedi_free_irq(unsigned int irq, struct comedi_device *dev_id);
-void comedi_rt_init(void);
-void comedi_rt_cleanup(void);
-int comedi_switch_to_rt(struct comedi_device *dev);
-void comedi_switch_to_non_rt(struct comedi_device *dev);
-void comedi_rt_pend_wakeup(wait_queue_head_t *q);
-extern int rt_pend_call(void (*func) (int arg1, void *arg2), int arg1,
-	void *arg2);
-
-#else
-
-#define comedi_request_irq(a, b, c, d, e) request_irq(a, b, c, d, e)
-#define comedi_free_irq(a, b) free_irq(a, b)
-#define comedi_rt_init() do {} while (0)
-#define comedi_rt_cleanup() do {} while (0)
-#define comedi_switch_to_rt(a) (-1)
-#define comedi_switch_to_non_rt(a) do {} while (0)
-#define comedi_rt_pend_wakeup(a) do {} while (0)
-
-#define rt_printk(format, args...)	printk(format, ##args)
-
-#endif
-
-/* Define a spin_lock_irqsave function that will work with rt or without.
- * Use inline functions instead of just macros to enforce some type checking.
- */
-#define comedi_spin_lock_irqsave(lock_ptr, flags) \
-	(flags = __comedi_spin_lock_irqsave(lock_ptr))
-
-static inline unsigned long __comedi_spin_lock_irqsave(spinlock_t *lock_ptr)
-{
-	unsigned long flags;
-
-#if defined(CONFIG_COMEDI_RTAI)
-	flags = rt_spin_lock_irqsave(lock_ptr);
-
-#elif defined(CONFIG_COMEDI_RTL)
-	rtl_spin_lock_irqsave(lock_ptr, flags);
-
-#elif defined(CONFIG_COMEDI_RTL_V1)
-	rtl_spin_lock_irqsave(lock_ptr, flags);
-
-#elif defined(CONFIG_COMEDI_FUSION)
-	rthal_spin_lock_irqsave(lock_ptr, flags);
-#else
-	spin_lock_irqsave(lock_ptr, flags);
-
-#endif
-
-	return flags;
-}
-
-static inline void comedi_spin_unlock_irqrestore(spinlock_t *lock_ptr,
-	unsigned long flags)
-{
-
-#if defined(CONFIG_COMEDI_RTAI)
-	rt_spin_unlock_irqrestore(flags, lock_ptr);
-
-#elif defined(CONFIG_COMEDI_RTL)
-	rtl_spin_unlock_irqrestore(lock_ptr, flags);
-
-#elif defined(CONFIG_COMEDI_RTL_V1)
-	rtl_spin_unlock_irqrestore(lock_ptr, flags);
-#elif defined(CONFIG_COMEDI_FUSION)
-	rthal_spin_unlock_irqrestore(lock_ptr, flags);
-#else
-	spin_unlock_irqrestore(lock_ptr, flags);
-
-#endif
-
-}
-
-/* define a RT safe udelay */
-static inline void comedi_udelay(unsigned int usec)
-{
-#if defined(CONFIG_COMEDI_RTAI)
-	static const int nanosec_per_usec = 1000;
-	rt_busy_sleep(usec * nanosec_per_usec);
-#elif defined(CONFIG_COMEDI_RTL)
-	static const int nanosec_per_usec = 1000;
-	rtl_delay(usec * nanosec_per_usec);
-#else
-	udelay(usec);
-#endif
-}
-
-#endif
diff --git a/drivers/staging/comedi/comedidev.h b/drivers/staging/comedi/comedidev.h
index 753d3ab312c0..0bfb58cb2936 100644
--- a/drivers/staging/comedi/comedidev.h
+++ b/drivers/staging/comedi/comedidev.h
@@ -523,8 +523,6 @@ struct usb_device;	/* forward declaration */
 int comedi_usb_auto_config(struct usb_device *usbdev, const char *board_name);
 void comedi_usb_auto_unconfig(struct usb_device *usbdev);
 
-#include "comedi_rt.h"
-
 #ifdef CONFIG_COMEDI_PCI_DRIVERS
 	#define CONFIG_COMEDI_PCI
 #endif
diff --git a/drivers/staging/comedi/drivers/cb_das16_cs.c b/drivers/staging/comedi/drivers/cb_das16_cs.c
index 7b064d5df6ff..7af245b42e51 100644
--- a/drivers/staging/comedi/drivers/cb_das16_cs.c
+++ b/drivers/staging/comedi/drivers/cb_das16_cs.c
@@ -31,6 +31,7 @@ Status: experimental
 
 */
 
+#include <linux/interrupt.h>
 #include "../comedidev.h"
 #include <linux/delay.h>
 #include <linux/pci.h>
diff --git a/drivers/staging/comedi/drivers/cb_pcimdas.c b/drivers/staging/comedi/drivers/cb_pcimdas.c
index c69ec5d51e76..57d250c73abc 100644
--- a/drivers/staging/comedi/drivers/cb_pcimdas.c
+++ b/drivers/staging/comedi/drivers/cb_pcimdas.c
@@ -43,6 +43,7 @@ See http://www.measurementcomputing.com/PDFManuals/pcim-das1602_16.pdf for more
 #include "../comedidev.h"
 
 #include <linux/delay.h>
+#include <linux/interrupt.h>
 
 #include "comedi_pci.h"
 #include "plx9052.h"
diff --git a/drivers/staging/comedi/drivers/comedi_rt_timer.c b/drivers/staging/comedi/drivers/comedi_rt_timer.c
deleted file mode 100644
index 0453a983571c..000000000000
--- a/drivers/staging/comedi/drivers/comedi_rt_timer.c
+++ /dev/null
@@ -1,756 +0,0 @@
-/*
-    comedi/drivers/comedi_rt_timer.c
-    virtual driver for using RTL timing sources
-
-    Authors: David A. Schleef, Frank M. Hess
-
-    COMEDI - Linux Control and Measurement Device Interface
-    Copyright (C) 1999,2001 David A. Schleef <ds@schleef.org>
-
-    This program is free software; you can redistribute it and/or modify
-    it under the terms of the GNU General Public License as published by
-    the Free Software Foundation; either version 2 of the License, or
-    (at your option) any later version.
-
-    This program is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    GNU General Public License for more details.
-
-    You should have received a copy of the GNU General Public License
-    along with this program; if not, write to the Free Software
-    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
-
-**************************************************************************
-*/
-/*
-Driver: comedi_rt_timer
-Description: Command emulator using real-time tasks
-Author: ds, fmhess
-Devices:
-Status: works
-
-This driver requires RTAI or RTLinux to work correctly.  It doesn't
-actually drive hardware directly, but calls other drivers and uses
-a real-time task to emulate commands for drivers and devices that
-are incapable of native commands.  Thus, you can get accurately
-timed I/O on any device.
-
-Since the timing is all done in software, sampling jitter is much
-higher than with a device that has an on-board timer, and maximum
-sample rate is much lower.
-
-Configuration options:
-  [0] - minor number of device you wish to emulate commands for
-  [1] - subdevice number you wish to emulate commands for
-*/
-/*
-TODO:
-	Support for digital io commands could be added, except I can't see why
-		anyone would want to use them
-	What happens if device we are emulating for is de-configured?
-*/
-
-#include "../comedidev.h"
-#include "../comedilib.h"
-
-#include "comedi_fc.h"
-
-#ifdef CONFIG_COMEDI_RTL_V1
-#include <rtl_sched.h>
-#include <asm/rt_irq.h>
-#endif
-#ifdef CONFIG_COMEDI_RTL
-#include <rtl.h>
-#include <rtl_sched.h>
-#include <rtl_compat.h>
-#include <asm/div64.h>
-
-#ifndef RTLINUX_VERSION_CODE
-#define RTLINUX_VERSION_CODE 0
-#endif
-#ifndef RTLINUX_VERSION
-#define RTLINUX_VERSION(a, b, c) (((a) << 16) + ((b) << 8) + (c))
-#endif
-
-/* begin hack to workaround broken HRT_TO_8254() function on rtlinux */
-#if RTLINUX_VERSION_CODE <= RTLINUX_VERSION(3, 0, 100)
-/* this function sole purpose is to divide a long long by 838 */
-static inline RTIME nano2count(long long ns)
-{
-	do_div(ns, 838);
-	return ns;
-}
-
-#ifdef rt_get_time()
-#undef rt_get_time()
-#endif
-#define rt_get_time() nano2count(gethrtime())
-
-#else
-
-#define nano2count(x) HRT_TO_8254(x)
-#endif
-/* end hack */
-
-/* rtl-rtai compatibility */
-#define rt_task_wait_period() rt_task_wait()
-#define rt_pend_linux_srq(irq) rtl_global_pend_irq(irq)
-#define rt_free_srq(irq) rtl_free_soft_irq(irq)
-#define rt_request_srq(x, y, z) rtl_get_soft_irq(y, "timer")
-#define rt_task_init(a, b, c, d, e, f, g) rt_task_init(a, b, c, d, (e)+1)
-#define rt_task_resume(x) rt_task_wakeup(x)
-#define rt_set_oneshot_mode()
-#define start_rt_timer(x)
-#define stop_rt_timer()
-
-#define comedi_rt_task_context_t	int
-
-#endif
-#ifdef CONFIG_COMEDI_RTAI
-#include <rtai.h>
-#include <rtai_sched.h>
-#include <rtai_version.h>
-
-/* RTAI_VERSION_CODE doesn't work for rtai-3.6-cv and other strange versions.
- * These are characterized by CONFIG_RTAI_REVISION_LEVEL being defined as an
- * empty macro and CONFIG_RTAI_VERSION_MINOR being defined as something like
- * '6-cv' or '7-test1'.  The problem has been noted by the RTAI folks and they
- * promise not to do it again. :-) Try and work around it here. */
-#if !(CONFIG_RTAI_REVISION_LEVEL + 0)
-#undef CONFIG_RTAI_REVISION_LEVEL
-#define CONFIG_RTAI_REVISION_LEVEL	0
-#define cv	0
-#define test1	0
-#define test2	0
-#define test3	0
-#endif
-
-#if RTAI_VERSION_CODE < RTAI_MANGLE_VERSION(3, 3, 0)
-#define comedi_rt_task_context_t	int
-#else
-#define comedi_rt_task_context_t	long
-#endif
-
-/* Finished checking RTAI_VERSION_CODE. */
-#undef cv
-#undef test1
-#undef test2
-#undef test3
-
-#endif
-
-/* This defines the fastest speed we will emulate.  Note that
- * without a watchdog (like in RTAI), we could easily overrun our
- * task period because analog input tends to be slow. */
-#define SPEED_LIMIT 100000	/* in nanoseconds */
-
-static int timer_attach(struct comedi_device *dev, struct comedi_devconfig *it);
-static int timer_detach(struct comedi_device *dev);
-static int timer_inttrig(struct comedi_device *dev, struct comedi_subdevice *s,
-	unsigned int trig_num);
-static int timer_start_cmd(struct comedi_device *dev, struct comedi_subdevice *s);
-
-static struct comedi_driver driver_timer = {
-	.module = THIS_MODULE,
-	.driver_name = "comedi_rt_timer",
-	.attach = timer_attach,
-	.detach = timer_detach,
-/*	.open = timer_open, */
-};
-
-COMEDI_INITCLEANUP(driver_timer);
-
-struct timer_private {
-	comedi_t *device;	/*  device we are emulating commands for */
-	int subd;		/*  subdevice we are emulating commands for */
-	RT_TASK *rt_task;	/*  rt task that starts scans */
-	RT_TASK *scan_task;	/*  rt task that controls conversion timing in a scan */
-	/* io_function can point to either an input or output function
-	 * depending on what kind of subdevice we are emulating for */
-	int (*io_function) (struct comedi_device *dev, struct comedi_cmd *cmd,
-		unsigned int index);
-/*
-* RTIME has units of 1 = 838 nanoseconds time at which first scan
-* started, used to check scan timing
-*/
-	RTIME start;
-	/*  time between scans */
-	RTIME scan_period;
-	/*  time between conversions in a scan */
-	RTIME convert_period;
-	/*  flags */
-	volatile int stop;	/*  indicates we should stop */
-	volatile int rt_task_active;	/*  indicates rt_task is servicing a struct comedi_cmd */
-	volatile int scan_task_active;	/*  indicates scan_task is servicing a struct comedi_cmd */
-	unsigned timer_running:1;
-};
-#define devpriv ((struct timer_private *)dev->private)
-
-static int timer_cancel(struct comedi_device *dev, struct comedi_subdevice *s)
-{
-	devpriv->stop = 1;
-
-	return 0;
-}
-
-/* checks for scan timing error */
-inline static int check_scan_timing(struct comedi_device *dev,
-	unsigned long long scan)
-{
-	RTIME now, timing_error;
-
-	now = rt_get_time();
-	timing_error = now - (devpriv->start + scan * devpriv->scan_period);
-	if (timing_error > devpriv->scan_period) {
-		comedi_error(dev, "timing error");
-		printk("scan started %i ns late\n", timing_error * 838);
-		return -1;
-	}
-
-	return 0;
-}
-
-/* checks for conversion timing error */
-inline static int check_conversion_timing(struct comedi_device *dev,
-	RTIME scan_start, unsigned int conversion)
-{
-	RTIME now, timing_error;
-
-	now = rt_get_time();
-	timing_error =
-		now - (scan_start + conversion * devpriv->convert_period);
-	if (timing_error > devpriv->convert_period) {
-		comedi_error(dev, "timing error");
-		printk("conversion started %i ns late\n",
-			timing_error * 838);
-		return -1;
-	}
-
-	return 0;
-}
-
-/* devpriv->io_function for an input subdevice */
-static int timer_data_read(struct comedi_device *dev, struct comedi_cmd *cmd,
-	unsigned int index)
-{
-	struct comedi_subdevice *s = dev->read_subdev;
-	int ret;
-	unsigned int data;
-
-	ret = comedi_data_read(devpriv->device, devpriv->subd,
-		CR_CHAN(cmd->chanlist[index]),
-		CR_RANGE(cmd->chanlist[index]),
-		CR_AREF(cmd->chanlist[index]), &data);
-	if (ret < 0) {
-		comedi_error(dev, "read error");
-		return -EIO;
-	}
-	if (s->flags & SDF_LSAMPL) {
-		cfc_write_long_to_buffer(s, data);
-	} else {
-		comedi_buf_put(s->async, data);
-	}
-
-	return 0;
-}
-
-/* devpriv->io_function for an output subdevice */
-static int timer_data_write(struct comedi_device *dev, struct comedi_cmd *cmd,
-	unsigned int index)
-{
-	struct comedi_subdevice *s = dev->write_subdev;
-	unsigned int num_bytes;
-	short data;
-	unsigned int long_data;
-	int ret;
-
-	if (s->flags & SDF_LSAMPL) {
-		num_bytes =
-			cfc_read_array_from_buffer(s, &long_data,
-			sizeof(long_data));
-	} else {
-		num_bytes = cfc_read_array_from_buffer(s, &data, sizeof(data));
-		long_data = data;
-	}
-
-	if (num_bytes == 0) {
-		comedi_error(dev, "buffer underrun");
-		return -EAGAIN;
-	}
-	ret = comedi_data_write(devpriv->device, devpriv->subd,
-		CR_CHAN(cmd->chanlist[index]),
-		CR_RANGE(cmd->chanlist[index]),
-		CR_AREF(cmd->chanlist[index]), long_data);
-	if (ret < 0) {
-		comedi_error(dev, "write error");
-		return -EIO;
-	}
-
-	return 0;
-}
-
-/* devpriv->io_function for DIO subdevices */
-static int timer_dio_read(struct comedi_device *dev, struct comedi_cmd *cmd,
-	unsigned int index)
-{
-	struct comedi_subdevice *s = dev->read_subdev;
-	int ret;
-	unsigned int data;
-
-	ret = comedi_dio_bitfield(devpriv->device, devpriv->subd, 0, &data);
-	if (ret < 0) {
-		comedi_error(dev, "read error");
-		return -EIO;
-	}
-
-	if (s->flags & SDF_LSAMPL)
-		cfc_write_long_to_buffer(s, data);
-	else
-		cfc_write_to_buffer(s, data);
-
-	return 0;
-}
-
-/* performs scans */
-static void scan_task_func(comedi_rt_task_context_t d)
-{
-	struct comedi_device *dev = (struct comedi_device *) d;
-	struct comedi_subdevice *s = dev->subdevices + 0;
-	struct comedi_async *async = s->async;
-	struct comedi_cmd *cmd = &async->cmd;
-	int i, ret;
-	unsigned long long n;
-	RTIME scan_start;
-
-	/*  every struct comedi_cmd causes one execution of while loop */
-	while (1) {
-		devpriv->scan_task_active = 1;
-		/*  each for loop completes one scan */
-		for (n = 0; n < cmd->stop_arg || cmd->stop_src == TRIG_NONE;
-			n++) {
-			if (n) {
-				/*  suspend task until next scan */
-				ret = rt_task_suspend(devpriv->scan_task);
-				if (ret < 0) {
-					comedi_error(dev,
-						"error suspending scan task");
-					async->events |= COMEDI_CB_ERROR;
-					goto cleanup;
-				}
-			}
-			/*  check if stop flag was set (by timer_cancel()) */
-			if (devpriv->stop)
-				goto cleanup;
-			ret = check_scan_timing(dev, n);
-			if (ret < 0) {
-				async->events |= COMEDI_CB_ERROR;
-				goto cleanup;
-			}
-			scan_start = rt_get_time();
-			for (i = 0; i < cmd->scan_end_arg; i++) {
-				/*  conversion timing */
-				if (cmd->convert_src == TRIG_TIMER && i) {
-					rt_task_wait_period();
-					ret = check_conversion_timing(dev,
-						scan_start, i);
-					if (ret < 0) {
-						async->events |=
-							COMEDI_CB_ERROR;
-						goto cleanup;
-					}
-				}
-				ret = devpriv->io_function(dev, cmd, i);
-				if (ret < 0) {
-					async->events |= COMEDI_CB_ERROR;
-					goto cleanup;
-				}
-			}
-			s->async->events |= COMEDI_CB_BLOCK;
-			comedi_event(dev, s);
-			s->async->events = 0;
-		}
-
-	      cleanup:
-
-		comedi_unlock(devpriv->device, devpriv->subd);
-		async->events |= COMEDI_CB_EOA;
-		comedi_event(dev, s);
-		async->events = 0;
-		devpriv->scan_task_active = 0;
-		/*  suspend task until next struct comedi_cmd */
-		rt_task_suspend(devpriv->scan_task);
-	}
-}
-
-static void timer_task_func(comedi_rt_task_context_t d)
-{
-	struct comedi_device *dev = (struct comedi_device *) d;
-	struct comedi_subdevice *s = dev->subdevices + 0;
-	struct comedi_cmd *cmd = &s->async->cmd;
-	int ret;
-	unsigned long long n;
-
-	/*  every struct comedi_cmd causes one execution of while loop */
-	while (1) {
-		devpriv->rt_task_active = 1;
-		devpriv->scan_task_active = 1;
-		devpriv->start = rt_get_time();
-
-		for (n = 0; n < cmd->stop_arg || cmd->stop_src == TRIG_NONE;
-			n++) {
-			/*  scan timing */
-			if (n)
-				rt_task_wait_period();
-			if (devpriv->scan_task_active == 0) {
-				goto cleanup;
-			}
-			ret = rt_task_make_periodic(devpriv->scan_task,
-				devpriv->start + devpriv->scan_period * n,
-				devpriv->convert_period);
-			if (ret < 0) {
-				comedi_error(dev, "bug!");
-			}
-		}
-
-	      cleanup:
-
-		devpriv->rt_task_active = 0;
-		/*  suspend until next struct comedi_cmd */
-		rt_task_suspend(devpriv->rt_task);
-	}
-}
-
-static int timer_insn(struct comedi_device *dev, struct comedi_subdevice *s,
-	struct comedi_insn *insn, unsigned int *data)
-{
-	struct comedi_insn xinsn = *insn;
-
-	xinsn.data = data;
-	xinsn.subdev = devpriv->subd;
-
-	return comedi_do_insn(devpriv->device, &xinsn);
-}
-
-static int cmdtest_helper(struct comedi_cmd *cmd,
-	unsigned int start_src,
-	unsigned int scan_begin_src,
-	unsigned int convert_src,
-	unsigned int scan_end_src, unsigned int stop_src)
-{
-	int err = 0;
-	int tmp;
-
-	tmp = cmd->start_src;
-	cmd->start_src &= start_src;
-	if (!cmd->start_src || tmp != cmd->start_src)
-		err++;
-
-	tmp = cmd->scan_begin_src;
-	cmd->scan_begin_src &= scan_begin_src;
-	if (!cmd->scan_begin_src || tmp != cmd->scan_begin_src)
-		err++;
-
-	tmp = cmd->convert_src;
-	cmd->convert_src &= convert_src;
-	if (!cmd->convert_src || tmp != cmd->convert_src)
-		err++;
-
-	tmp = cmd->scan_end_src;
-	cmd->scan_end_src &= scan_end_src;
-	if (!cmd->scan_end_src || tmp != cmd->scan_end_src)
-		err++;
-
-	tmp = cmd->stop_src;
-	cmd->stop_src &= stop_src;
-	if (!cmd->stop_src || tmp != cmd->stop_src)
-		err++;
-
-	return err;
-}
-
-static int timer_cmdtest(struct comedi_device *dev, struct comedi_subdevice *s,
-	struct comedi_cmd *cmd)
-{
-	int err = 0;
-	unsigned int start_src = 0;
-
-	if (s->type == COMEDI_SUBD_AO)
-		start_src = TRIG_INT;
-	else
-		start_src = TRIG_NOW;
-
-	err = cmdtest_helper(cmd, start_src,	/* start_src */
-		TRIG_TIMER | TRIG_FOLLOW,	/* scan_begin_src */
-		TRIG_NOW | TRIG_TIMER,	/* convert_src */
-		TRIG_COUNT,	/* scan_end_src */
-		TRIG_COUNT | TRIG_NONE);	/* stop_src */
-	if (err)
-		return 1;
-
-	/* step 2: make sure trigger sources are unique and mutually
-	 * compatible */
-
-	if (cmd->start_src != TRIG_NOW && cmd->start_src != TRIG_INT)
-		err++;
-	if (cmd->scan_begin_src != TRIG_TIMER &&
-		cmd->scan_begin_src != TRIG_FOLLOW)
-		err++;
-	if (cmd->convert_src != TRIG_TIMER && cmd->convert_src != TRIG_NOW)
-		err++;
-	if (cmd->stop_src != TRIG_COUNT && cmd->stop_src != TRIG_NONE)
-		err++;
-	if (cmd->scan_begin_src == TRIG_FOLLOW
-		&& cmd->convert_src != TRIG_TIMER)
-		err++;
-	if (cmd->convert_src == TRIG_NOW && cmd->scan_begin_src != TRIG_TIMER)
-		err++;
-
-	if (err)
-		return 2;
-
-	/* step 3: make sure arguments are trivially compatible */
-	/*  limit frequency, this is fairly arbitrary */
-	if (cmd->scan_begin_src == TRIG_TIMER) {
-		if (cmd->scan_begin_arg < SPEED_LIMIT) {
-			cmd->scan_begin_arg = SPEED_LIMIT;
-			err++;
-		}
-	}
-	if (cmd->convert_src == TRIG_TIMER) {
-		if (cmd->convert_arg < SPEED_LIMIT) {
-			cmd->convert_arg = SPEED_LIMIT;
-			err++;
-		}
-	}
-	/*  make sure conversion and scan frequencies are compatible */
-	if (cmd->convert_src == TRIG_TIMER && cmd->scan_begin_src == TRIG_TIMER) {
-		if (cmd->convert_arg * cmd->scan_end_arg > cmd->scan_begin_arg) {
-			cmd->scan_begin_arg =
-				cmd->convert_arg * cmd->scan_end_arg;
-			err++;
-		}
-	}
-	if (err)
-		return 3;
-
-	/* step 4: fix up and arguments */
-	if (err)
-		return 4;
-
-	return 0;
-}
-
-static int timer_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
-{
-	int ret;
-	struct comedi_cmd *cmd = &s->async->cmd;
-
-	/* hack attack: drivers are not supposed to do this: */
-	dev->rt = 1;
-
-	/*  make sure tasks have finished cleanup of last struct comedi_cmd */
-	if (devpriv->rt_task_active || devpriv->scan_task_active)
-		return -EBUSY;
-
-	ret = comedi_lock(devpriv->device, devpriv->subd);
-	if (ret < 0) {
-		comedi_error(dev, "failed to obtain lock");
-		return ret;
-	}
-	switch (cmd->scan_begin_src) {
-	case TRIG_TIMER:
-		devpriv->scan_period = nano2count(cmd->scan_begin_arg);
-		break;
-	case TRIG_FOLLOW:
-		devpriv->scan_period =
-			nano2count(cmd->convert_arg * cmd->scan_end_arg);
-		break;
-	default:
-		comedi_error(dev, "bug setting scan period!");
-		return -1;
-		break;
-	}
-	switch (cmd->convert_src) {
-	case TRIG_TIMER:
-		devpriv->convert_period = nano2count(cmd->convert_arg);
-		break;
-	case TRIG_NOW:
-		devpriv->convert_period = 1;
-		break;
-	default:
-		comedi_error(dev, "bug setting conversion period!");
-		return -1;
-		break;
-	}
-
-	if (cmd->start_src == TRIG_NOW)
-		return timer_start_cmd(dev, s);
-
-	s->async->inttrig = timer_inttrig;
-
-	return 0;
-}
-
-static int timer_inttrig(struct comedi_device *dev, struct comedi_subdevice *s,
-	unsigned int trig_num)
-{
-	if (trig_num != 0)
-		return -EINVAL;
-
-	s->async->inttrig = NULL;
-
-	return timer_start_cmd(dev, s);
-}
-
-static int timer_start_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
-{
-	struct comedi_async *async = s->async;
-	struct comedi_cmd *cmd = &async->cmd;
-	RTIME now, delay, period;
-	int ret;
-
-	devpriv->stop = 0;
-	s->async->events = 0;
-
-	if (cmd->start_src == TRIG_NOW)
-		delay = nano2count(cmd->start_arg);
-	else
-		delay = 0;
-
-	now = rt_get_time();
-	/* Using 'period' this way gets around some weird bug in gcc-2.95.2
-	 * that generates the compile error 'internal error--unrecognizable insn'
-	 * when rt_task_make_period() is called (observed with rtlinux-3.1, linux-2.2.19).
-	 *  - fmhess */
-	period = devpriv->scan_period;
-	ret = rt_task_make_periodic(devpriv->rt_task, now + delay, period);
-	if (ret < 0) {
-		comedi_error(dev, "error starting rt_task");
-		return ret;
-	}
-	return 0;
-}
-
-static int timer_attach(struct comedi_device *dev, struct comedi_devconfig *it)
-{
-	int ret;
-	struct comedi_subdevice *s, *emul_s;
-	struct comedi_device *emul_dev;
-	/* These should probably be devconfig options[] */
-	const int timer_priority = 4;
-	const int scan_priority = timer_priority + 1;
-	char path[20];
-
-	printk("comedi%d: timer: ", dev->minor);
-
-	dev->board_name = "timer";
-
-	ret = alloc_subdevices(dev, 1);
-	if (ret < 0)
-		return ret;
-
-	ret = alloc_private(dev, sizeof(struct timer_private));
-	if (ret < 0)
-		return ret;
-
-	sprintf(path, "/dev/comedi%d", it->options[0]);
-	devpriv->device = comedi_open(path);
-	devpriv->subd = it->options[1];
-
-	printk("emulating commands for minor %i, subdevice %d\n",
-		it->options[0], devpriv->subd);
-
-	emul_dev = devpriv->device;
-	emul_s = emul_dev->subdevices + devpriv->subd;
-
-	/*  input or output subdevice */
-	s = dev->subdevices + 0;
-	s->type = emul_s->type;
-	s->subdev_flags = emul_s->subdev_flags;	/* SDF_GROUND (to fool check_driver) */
-	s->n_chan = emul_s->n_chan;
-	s->len_chanlist = 1024;
-	s->do_cmd = timer_cmd;
-	s->do_cmdtest = timer_cmdtest;
-	s->cancel = timer_cancel;
-	s->maxdata = emul_s->maxdata;
-	s->range_table = emul_s->range_table;
-	s->range_table_list = emul_s->range_table_list;
-	switch (emul_s->type) {
-	case COMEDI_SUBD_AI:
-		s->insn_read = timer_insn;
-		dev->read_subdev = s;
-		s->subdev_flags |= SDF_CMD_READ;
-		devpriv->io_function = timer_data_read;
-		break;
-	case COMEDI_SUBD_AO:
-		s->insn_write = timer_insn;
-		s->insn_read = timer_insn;
-		dev->write_subdev = s;
-		s->subdev_flags |= SDF_CMD_WRITE;
-		devpriv->io_function = timer_data_write;
-		break;
-	case COMEDI_SUBD_DIO:
-		s->insn_write = timer_insn;
-		s->insn_read = timer_insn;
-		s->insn_bits = timer_insn;
-		dev->read_subdev = s;
-		s->subdev_flags |= SDF_CMD_READ;
-		devpriv->io_function = timer_dio_read;
-		break;
-	default:
-		comedi_error(dev, "failed to determine subdevice type!");
-		return -EINVAL;
-	}
-
-	rt_set_oneshot_mode();
-	start_rt_timer(1);
-	devpriv->timer_running = 1;
-
-	devpriv->rt_task = kzalloc(sizeof(RT_TASK), GFP_KERNEL);
-
-	/*  initialize real-time tasks */
-	ret = rt_task_init(devpriv->rt_task, timer_task_func,
-		(comedi_rt_task_context_t) dev, 3000, timer_priority, 0, 0);
-	if (ret < 0) {
-		comedi_error(dev, "error initalizing rt_task");
-		kfree(devpriv->rt_task);
-		devpriv->rt_task = 0;
-		return ret;
-	}
-
-	devpriv->scan_task = kzalloc(sizeof(RT_TASK), GFP_KERNEL);
-
-	ret = rt_task_init(devpriv->scan_task, scan_task_func,
-		(comedi_rt_task_context_t) dev, 3000, scan_priority, 0, 0);
-	if (ret < 0) {
-		comedi_error(dev, "error initalizing scan_task");
-		kfree(devpriv->scan_task);
-		devpriv->scan_task = 0;
-		return ret;
-	}
-
-	return 1;
-}
-
-/* free allocated resources */
-static int timer_detach(struct comedi_device *dev)
-{
-	printk("comedi%d: timer: remove\n", dev->minor);
-
-	if (devpriv) {
-		if (devpriv->rt_task) {
-			rt_task_delete(devpriv->rt_task);
-			kfree(devpriv->rt_task);
-		}
-		if (devpriv->scan_task) {
-			rt_task_delete(devpriv->scan_task);
-			kfree(devpriv->scan_task);
-		}
-		if (devpriv->timer_running)
-			stop_rt_timer();
-		if (devpriv->device)
-			comedi_close(devpriv->device);
-	}
-	return 0;
-}
diff --git a/drivers/staging/comedi/drivers/daqboard2000.c b/drivers/staging/comedi/drivers/daqboard2000.c
index ff0ca2c51ce6..d4526c616a99 100644
--- a/drivers/staging/comedi/drivers/daqboard2000.c
+++ b/drivers/staging/comedi/drivers/daqboard2000.c
@@ -119,6 +119,7 @@ Configuration options:
 #include "../comedidev.h"
 
 #include <linux/delay.h>
+#include <linux/interrupt.h>
 
 #include "comedi_pci.h"
 #include "8255.h"
diff --git a/drivers/staging/comedi/drivers/das16.c b/drivers/staging/comedi/drivers/das16.c
index c0fbb8516730..59af86a8bbfb 100644
--- a/drivers/staging/comedi/drivers/das16.c
+++ b/drivers/staging/comedi/drivers/das16.c
@@ -79,6 +79,7 @@ Computer boards manuals also available from their website www.measurementcomputi
 */
 
 #include <linux/pci.h>
+#include <linux/interrupt.h>
 #include <asm/dma.h>
 #include "../comedidev.h"
 
diff --git a/drivers/staging/comedi/drivers/das16m1.c b/drivers/staging/comedi/drivers/das16m1.c
index a0e405fc4c67..3da8bf47cbf6 100644
--- a/drivers/staging/comedi/drivers/das16m1.c
+++ b/drivers/staging/comedi/drivers/das16m1.c
@@ -59,6 +59,7 @@ irq can be omitted, although the cmd interface will not work without it.
 */
 
 #include <linux/ioport.h>
+#include <linux/interrupt.h>
 #include "../comedidev.h"
 
 #include "8255.h"
diff --git a/drivers/staging/comedi/drivers/das1800.c b/drivers/staging/comedi/drivers/das1800.c
index 5d67d2359add..a3434088c9e6 100644
--- a/drivers/staging/comedi/drivers/das1800.c
+++ b/drivers/staging/comedi/drivers/das1800.c
@@ -100,6 +100,7 @@ TODO:
 	read insn for analog out
 */
 
+#include <linux/interrupt.h>
 #include "../comedidev.h"
 
 #include <linux/ioport.h>
diff --git a/drivers/staging/comedi/drivers/das6402.c b/drivers/staging/comedi/drivers/das6402.c
index 37611ef80f5f..0114eb935305 100644
--- a/drivers/staging/comedi/drivers/das6402.c
+++ b/drivers/staging/comedi/drivers/das6402.c
@@ -38,6 +38,7 @@ Devices: [Keithley Metrabyte] DAS6402 (das6402)
 This driver has suffered bitrot.
 */
 
+#include <linux/interrupt.h>
 #include "../comedidev.h"
 
 #include <linux/ioport.h>
diff --git a/drivers/staging/comedi/drivers/das800.c b/drivers/staging/comedi/drivers/das800.c
index ef64a20d836b..70e9d699c7a3 100644
--- a/drivers/staging/comedi/drivers/das800.c
+++ b/drivers/staging/comedi/drivers/das800.c
@@ -62,6 +62,7 @@ cmd triggers supported:
 
 */
 
+#include <linux/interrupt.h>
 #include "../comedidev.h"
 
 #include <linux/ioport.h>
diff --git a/drivers/staging/comedi/drivers/dmm32at.c b/drivers/staging/comedi/drivers/dmm32at.c
index 5a53c61ddbdf..573cbe72b20b 100644
--- a/drivers/staging/comedi/drivers/dmm32at.c
+++ b/drivers/staging/comedi/drivers/dmm32at.c
@@ -74,6 +74,7 @@ Configuration Options:
  * options that are used with comedi_config.
  */
 
+#include <linux/interrupt.h>
 #include "../comedidev.h"
 #include <linux/ioport.h>
 
diff --git a/drivers/staging/comedi/drivers/dt2811.c b/drivers/staging/comedi/drivers/dt2811.c
index a112324fc45d..7853902be621 100644
--- a/drivers/staging/comedi/drivers/dt2811.c
+++ b/drivers/staging/comedi/drivers/dt2811.c
@@ -45,6 +45,7 @@ Configuration options:
   [4] - D/A 1 range (same choices)
 */
 
+#include <linux/interrupt.h>
 #include "../comedidev.h"
 
 #include <linux/ioport.h>
diff --git a/drivers/staging/comedi/drivers/dt2814.c b/drivers/staging/comedi/drivers/dt2814.c
index c639d7415ce7..5906ddddf65c 100644
--- a/drivers/staging/comedi/drivers/dt2814.c
+++ b/drivers/staging/comedi/drivers/dt2814.c
@@ -39,6 +39,7 @@ a power of 10, from 1 to 10^7, of which only 3 or 4 are useful.  In
 addition, the clock does not seem to be very accurate.
 */
 
+#include <linux/interrupt.h>
 #include "../comedidev.h"
 
 #include <linux/ioport.h>
diff --git a/drivers/staging/comedi/drivers/dt3000.c b/drivers/staging/comedi/drivers/dt3000.c
index 6ece082583c9..2af8b59f9061 100644
--- a/drivers/staging/comedi/drivers/dt3000.c
+++ b/drivers/staging/comedi/drivers/dt3000.c
@@ -59,6 +59,7 @@ AO commands are not supported.
 
 #define DEBUG 1
 
+#include <linux/interrupt.h>
 #include "../comedidev.h"
 #include <linux/delay.h>
 
diff --git a/drivers/staging/comedi/drivers/gsc_hpdi.c b/drivers/staging/comedi/drivers/gsc_hpdi.c
index dedd0df37549..b156ae717ae4 100644
--- a/drivers/staging/comedi/drivers/gsc_hpdi.c
+++ b/drivers/staging/comedi/drivers/gsc_hpdi.c
@@ -45,6 +45,7 @@ support could be added to this driver.
 
 */
 
+#include <linux/interrupt.h>
 #include "../comedidev.h"
 #include <linux/delay.h>
 
diff --git a/drivers/staging/comedi/drivers/icp_multi.c b/drivers/staging/comedi/drivers/icp_multi.c
index 4cfdfc55b6ed..984f995149b6 100644
--- a/drivers/staging/comedi/drivers/icp_multi.c
+++ b/drivers/staging/comedi/drivers/icp_multi.c
@@ -50,6 +50,7 @@ Options:
  [1] - PCI slot number
 */
 
+#include <linux/interrupt.h>
 #include "../comedidev.h"
 
 #include <linux/delay.h>
diff --git a/drivers/staging/comedi/drivers/me4000.c b/drivers/staging/comedi/drivers/me4000.c
index bf7833011a4c..236845871735 100644
--- a/drivers/staging/comedi/drivers/me4000.c
+++ b/drivers/staging/comedi/drivers/me4000.c
@@ -51,6 +51,7 @@ broken.
 
  */
 
+#include <linux/interrupt.h>
 #include "../comedidev.h"
 
 #include <linux/delay.h>
diff --git a/drivers/staging/comedi/drivers/me_daq.c b/drivers/staging/comedi/drivers/me_daq.c
index 0f023d009e61..f21cecaa2e09 100644
--- a/drivers/staging/comedi/drivers/me_daq.c
+++ b/drivers/staging/comedi/drivers/me_daq.c
@@ -50,6 +50,7 @@ from http://www.comedi.org
 
 */
 
+#include <linux/interrupt.h>
 #include "../comedidev.h"
 
 #include "comedi_pci.h"
diff --git a/drivers/staging/comedi/drivers/multiq3.c b/drivers/staging/comedi/drivers/multiq3.c
index b3412241633a..f7cce6cc7766 100644
--- a/drivers/staging/comedi/drivers/multiq3.c
+++ b/drivers/staging/comedi/drivers/multiq3.c
@@ -29,6 +29,7 @@ Devices: [Quanser Consulting] MultiQ-3 (multiq3)
 
 */
 
+#include <linux/interrupt.h>
 #include "../comedidev.h"
 
 #include <linux/ioport.h>
diff --git a/drivers/staging/comedi/drivers/ni_6527.c b/drivers/staging/comedi/drivers/ni_6527.c
index 491bdf22cd3e..67adc97265bd 100644
--- a/drivers/staging/comedi/drivers/ni_6527.c
+++ b/drivers/staging/comedi/drivers/ni_6527.c
@@ -41,6 +41,7 @@ Updated: Sat, 25 Jan 2003 13:24:40 -0800
 #define DEBUG 1
 #define DEBUG_FLAGS
 
+#include <linux/interrupt.h>
 #include "../comedidev.h"
 
 #include "mite.h"
diff --git a/drivers/staging/comedi/drivers/ni_65xx.c b/drivers/staging/comedi/drivers/ni_65xx.c
index 8c3cbf9f0e11..35708503dec3 100644
--- a/drivers/staging/comedi/drivers/ni_65xx.c
+++ b/drivers/staging/comedi/drivers/ni_65xx.c
@@ -50,6 +50,7 @@ except maybe the 6514.
 #define _GNU_SOURCE
 #define DEBUG 1
 #define DEBUG_FLAGS
+#include <linux/interrupt.h>
 #include "../comedidev.h"
 
 #include "mite.h"
diff --git a/drivers/staging/comedi/drivers/ni_660x.c b/drivers/staging/comedi/drivers/ni_660x.c
index 68a6ec8fd1a0..11e9b0411805 100644
--- a/drivers/staging/comedi/drivers/ni_660x.c
+++ b/drivers/staging/comedi/drivers/ni_660x.c
@@ -40,6 +40,7 @@ DAQ 6601/6602 User Manual (NI 322137B-01)
 
 */
 
+#include <linux/interrupt.h>
 #include "../comedidev.h"
 #include "mite.h"
 #include "ni_tio.h"
diff --git a/drivers/staging/comedi/drivers/ni_670x.c b/drivers/staging/comedi/drivers/ni_670x.c
index 7bb22919eb8f..71f7d3ab3aa1 100644
--- a/drivers/staging/comedi/drivers/ni_670x.c
+++ b/drivers/staging/comedi/drivers/ni_670x.c
@@ -41,6 +41,7 @@ Commands are not supported.
 
 */
 
+#include <linux/interrupt.h>
 #include "../comedidev.h"
 
 #include "mite.h"
diff --git a/drivers/staging/comedi/drivers/ni_at_a2150.c b/drivers/staging/comedi/drivers/ni_at_a2150.c
index 4f348b77bb4a..45c6809031db 100644
--- a/drivers/staging/comedi/drivers/ni_at_a2150.c
+++ b/drivers/staging/comedi/drivers/ni_at_a2150.c
@@ -64,6 +64,7 @@ TRIG_WAKE_EOS
 
 */
 
+#include <linux/interrupt.h>
 #include "../comedidev.h"
 
 #include <linux/ioport.h>
diff --git a/drivers/staging/comedi/drivers/ni_atmio.c b/drivers/staging/comedi/drivers/ni_atmio.c
index c39d388c90f2..8839447538f2 100644
--- a/drivers/staging/comedi/drivers/ni_atmio.c
+++ b/drivers/staging/comedi/drivers/ni_atmio.c
@@ -93,6 +93,7 @@ are not supported.
 
 */
 
+#include <linux/interrupt.h>
 #include "../comedidev.h"
 
 #include <linux/delay.h>
diff --git a/drivers/staging/comedi/drivers/ni_atmio16d.c b/drivers/staging/comedi/drivers/ni_atmio16d.c
index 67034380af3a..1a8c2ab20d3d 100644
--- a/drivers/staging/comedi/drivers/ni_atmio16d.c
+++ b/drivers/staging/comedi/drivers/ni_atmio16d.c
@@ -35,6 +35,7 @@ Devices: [National Instruments] AT-MIO-16 (atmio16), AT-MIO-16D (atmio16d)
  *
  */
 
+#include <linux/interrupt.h>
 #include "../comedidev.h"
 
 #include <linux/ioport.h>
diff --git a/drivers/staging/comedi/drivers/ni_daq_700.c b/drivers/staging/comedi/drivers/ni_daq_700.c
index 6a69d36018e0..e34948205320 100644
--- a/drivers/staging/comedi/drivers/ni_daq_700.c
+++ b/drivers/staging/comedi/drivers/ni_daq_700.c
@@ -41,6 +41,7 @@ emu as port A output, port B input, port C N/A).
 IRQ is assigned but not used.
 */
 
+#include <linux/interrupt.h>
 #include "../comedidev.h"
 
 #include <linux/ioport.h>
diff --git a/drivers/staging/comedi/drivers/ni_daq_dio24.c b/drivers/staging/comedi/drivers/ni_daq_dio24.c
index 7f378e529d0f..a8ac02febc66 100644
--- a/drivers/staging/comedi/drivers/ni_daq_dio24.c
+++ b/drivers/staging/comedi/drivers/ni_daq_dio24.c
@@ -40,6 +40,7 @@ the PCMCIA interface.
 /* #define LABPC_DEBUG */   /*  enable debugging messages */
 #undef LABPC_DEBUG
 
+#include <linux/interrupt.h>
 #include "../comedidev.h"
 
 #include <linux/ioport.h>
diff --git a/drivers/staging/comedi/drivers/ni_labpc.c b/drivers/staging/comedi/drivers/ni_labpc.c
index 435e34a838aa..30e11f46a640 100644
--- a/drivers/staging/comedi/drivers/ni_labpc.c
+++ b/drivers/staging/comedi/drivers/ni_labpc.c
@@ -76,6 +76,7 @@ NI manuals:
 #undef LABPC_DEBUG
 /* #define LABPC_DEBUG    enable debugging messages */
 
+#include <linux/interrupt.h>
 #include "../comedidev.h"
 
 #include <linux/delay.h>
diff --git a/drivers/staging/comedi/drivers/ni_mio_common.c b/drivers/staging/comedi/drivers/ni_mio_common.c
index 476f30a13d16..d727d7533fc8 100644
--- a/drivers/staging/comedi/drivers/ni_mio_common.c
+++ b/drivers/staging/comedi/drivers/ni_mio_common.c
@@ -61,6 +61,7 @@
 /* #define DEBUG_STATUS_A */
 /* #define DEBUG_STATUS_B */
 
+#include <linux/interrupt.h>
 #include "8255.h"
 #include "mite.h"
 #include "comedi_fc.h"
diff --git a/drivers/staging/comedi/drivers/ni_pcidio.c b/drivers/staging/comedi/drivers/ni_pcidio.c
index cbc203fd066f..6b86a39aac5e 100644
--- a/drivers/staging/comedi/drivers/ni_pcidio.c
+++ b/drivers/staging/comedi/drivers/ni_pcidio.c
@@ -69,6 +69,7 @@ comedi_nonfree_firmware tarball available from http://www.comedi.org
 /* #define DEBUG 1 */
 /* #define DEBUG_FLAGS */
 
+#include <linux/interrupt.h>
 #include "../comedidev.h"
 
 #include "mite.h"
diff --git a/drivers/staging/comedi/drivers/pcl711.c b/drivers/staging/comedi/drivers/pcl711.c
index 01faaf95d199..7b72b7af75c8 100644
--- a/drivers/staging/comedi/drivers/pcl711.c
+++ b/drivers/staging/comedi/drivers/pcl711.c
@@ -58,6 +58,7 @@ supported.
 
  */
 
+#include <linux/interrupt.h>
 #include "../comedidev.h"
 
 #include <linux/ioport.h>
diff --git a/drivers/staging/comedi/drivers/pcl812.c b/drivers/staging/comedi/drivers/pcl812.c
index 46fad0393e31..dd91fe9f5f51 100644
--- a/drivers/staging/comedi/drivers/pcl812.c
+++ b/drivers/staging/comedi/drivers/pcl812.c
@@ -107,6 +107,7 @@ Options for ACL-8113, ISO-813:
         3= 20V unipolar inputs
 */
 
+#include <linux/interrupt.h>
 #include "../comedidev.h"
 
 #include <linux/delay.h>
diff --git a/drivers/staging/comedi/drivers/pcmad.c b/drivers/staging/comedi/drivers/pcmad.c
index 14f40df298eb..9bb26699f47e 100644
--- a/drivers/staging/comedi/drivers/pcmad.c
+++ b/drivers/staging/comedi/drivers/pcmad.c
@@ -41,6 +41,7 @@ Configuration options:
           1 = two's complement
 */
 
+#include <linux/interrupt.h>
 #include "../comedidev.h"
 
 #include <linux/ioport.h>
diff --git a/drivers/staging/comedi/drivers/pcmmio.c b/drivers/staging/comedi/drivers/pcmmio.c
index 55a2d1d0408d..6931f1075089 100644
--- a/drivers/staging/comedi/drivers/pcmmio.c
+++ b/drivers/staging/comedi/drivers/pcmmio.c
@@ -73,6 +73,7 @@ Configuration Options:
   [1] - IRQ (optional -- for edge-detect interrupt support only, leave out if you don't need this feature)
 */
 
+#include <linux/interrupt.h>
 #include "../comedidev.h"
 #include <linux/pci.h>		/* for PCI devices */
 
diff --git a/drivers/staging/comedi/drivers/pcmuio.c b/drivers/staging/comedi/drivers/pcmuio.c
index 291b6d963fd9..8df67c37795b 100644
--- a/drivers/staging/comedi/drivers/pcmuio.c
+++ b/drivers/staging/comedi/drivers/pcmuio.c
@@ -75,6 +75,7 @@ Configuration Options:
   [2] - IRQ for second ASIC (pcmuio96 only - IRQ for chans 48-72 .. can be the same as first irq!)
 */
 
+#include <linux/interrupt.h>
 #include "../comedidev.h"
 
 #include <linux/pci.h>		/* for PCI devices */
diff --git a/drivers/staging/comedi/drivers/rtd520.c b/drivers/staging/comedi/drivers/rtd520.c
index 3536ec5fbfce..243ee76c836d 100644
--- a/drivers/staging/comedi/drivers/rtd520.c
+++ b/drivers/staging/comedi/drivers/rtd520.c
@@ -101,6 +101,7 @@ Configuration options:
 
 */
 
+#include <linux/interrupt.h>
 #include <linux/delay.h>
 
 #include "../comedidev.h"
diff --git a/drivers/staging/comedi/drivers/rti800.c b/drivers/staging/comedi/drivers/rti800.c
index 46b5e3fb6742..f1b7e0252f13 100644
--- a/drivers/staging/comedi/drivers/rti800.c
+++ b/drivers/staging/comedi/drivers/rti800.c
@@ -52,6 +52,7 @@ Configuration options:
   [8] - DAC 1 encoding (same as DAC 0)
 */
 
+#include <linux/interrupt.h>
 #include "../comedidev.h"
 
 #include <linux/ioport.h>
diff --git a/drivers/staging/comedi/drivers/s626.c b/drivers/staging/comedi/drivers/s626.c
index bebc12bf3891..92121cf8c45c 100644
--- a/drivers/staging/comedi/drivers/s626.c
+++ b/drivers/staging/comedi/drivers/s626.c
@@ -68,6 +68,7 @@ INSN_CONFIG instructions:
    comedi_do_insn(cf,&insn); //executing configuration
 */
 
+#include <linux/interrupt.h>
 #include <linux/kernel.h>
 #include <linux/types.h>
 
diff --git a/drivers/staging/comedi/kcomedilib/kcomedilib_main.c b/drivers/staging/comedi/kcomedilib/kcomedilib_main.c
index 95f0dde8d3e6..b39ea7c50b87 100644
--- a/drivers/staging/comedi/kcomedilib/kcomedilib_main.c
+++ b/drivers/staging/comedi/kcomedilib/kcomedilib_main.c
@@ -150,10 +150,6 @@ int comedi_command(void *d, struct comedi_cmd *cmd)
 
 	runflags = SRF_RUNNING;
 
-#ifdef CONFIG_COMEDI_RT
-	if (comedi_switch_to_rt(dev) == 0)
-		runflags |= SRF_RT;
-#endif
 	comedi_set_subdevice_runflags(s, ~0, runflags);
 
 	comedi_reset_async_buf(async);
@@ -449,11 +445,6 @@ int comedi_cancel(void *d, unsigned int subdevice)
 	if (ret)
 		return ret;
 
-#ifdef CONFIG_COMEDI_RT
-	if (comedi_get_subdevice_runflags(s) & SRF_RT)
-		comedi_switch_to_non_rt(dev);
-
-#endif
 	comedi_set_subdevice_runflags(s, SRF_RUNNING | SRF_RT, 0);
 	s->async->inttrig = NULL;
 	s->busy = NULL;
diff --git a/drivers/staging/comedi/rt.c b/drivers/staging/comedi/rt.c
deleted file mode 100644
index ace360d4a492..000000000000
--- a/drivers/staging/comedi/rt.c
+++ /dev/null
@@ -1,411 +0,0 @@
-/*
-    comedi/rt.c
-    comedi kernel module
-
-    COMEDI - Linux Control and Measurement Device Interface
-    Copyright (C) 1997-2000 David A. Schleef <ds@schleef.org>
-
-    This program is free software; you can redistribute it and/or modify
-    it under the terms of the GNU General Public License as published by
-    the Free Software Foundation; either version 2 of the License, or
-    (at your option) any later version.
-
-    This program is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    GNU General Public License for more details.
-
-    You should have received a copy of the GNU General Public License
-    along with this program; if not, write to the Free Software
-    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
-
-*/
-
-#undef DEBUG
-
-#define __NO_VERSION__
-#include <linux/comedidev.h>
-
-#include <linux/errno.h>
-#include <linux/interrupt.h>
-#include <linux/kernel.h>
-#include <linux/sched.h>
-#include <linux/fcntl.h>
-#include <linux/delay.h>
-#include <linux/ioport.h>
-#include <linux/mm.h>
-#include <linux/slab.h>
-#include <asm/io.h>
-
-#include "rt_pend_tq.h"
-
-#ifdef CONFIG_COMEDI_RTAI
-#include <rtai.h>
-#endif
-
-#ifdef CONFIG_COMEDI_FUSION
-#include <nucleus/asm/hal.h>
-#endif
-
-#ifdef CONFIG_COMEDI_RTL
-#include <rtl_core.h>
-#include <rtl_sync.h>
-#endif
-
-struct comedi_irq_struct {
-	int rt;
-	int irq;
-	irq_handler_t handler;
-	unsigned long flags;
-	const char *device;
-	struct comedi_device *dev_id;
-};
-
-static int comedi_rt_get_irq(struct comedi_irq_struct *it);
-static int comedi_rt_release_irq(struct comedi_irq_struct *it);
-
-static struct comedi_irq_struct *comedi_irqs[NR_IRQS];
-
-int comedi_request_irq(unsigned irq, irq_handler_t handler, unsigned long flags,
-		const char *device, struct comedi_device *dev_id)
-{
-	struct comedi_irq_struct *it;
-	int ret;
-	/* null shared interrupt flag, since rt interrupt handlers do not
-	 * support it, and this version of comedi_request_irq() is only
-	 * called for kernels with rt support */
-	unsigned long unshared_flags = flags & ~IRQF_SHARED;
-
-	ret = request_irq(irq, handler, unshared_flags, device, dev_id);
-	if (ret < 0) {
-		/*  we failed, so fall back on allowing shared interrupt (which we won't ever make RT) */
-		if (flags & IRQF_SHARED) {
-			rt_printk
-				("comedi: cannot get unshared interrupt, will not use RT interrupts.\n");
-			ret = request_irq(irq, handler, flags, device, dev_id);
-		}
-		if (ret < 0)
-			return ret;
-
-	} else {
-		it = kzalloc(sizeof(struct comedi_irq_struct), GFP_KERNEL);
-		if (!it)
-			return -ENOMEM;
-
-		it->handler = handler;
-		it->irq = irq;
-		it->dev_id = dev_id;
-		it->device = device;
-		it->flags = unshared_flags;
-		comedi_irqs[irq] = it;
-	}
-	return 0;
-}
-
-void comedi_free_irq(unsigned int irq, struct comedi_device *dev_id)
-{
-	struct comedi_irq_struct *it;
-
-	free_irq(irq, dev_id);
-
-	it = comedi_irqs[irq];
-	if (it == NULL)
-		return;
-
-	if (it->rt) {
-		printk("real-time IRQ allocated at board removal (ignore)\n");
-		comedi_rt_release_irq(it);
-	}
-
-	kfree(it);
-	comedi_irqs[irq] = NULL;
-}
-
-int comedi_switch_to_rt(struct comedi_device *dev)
-{
-	struct comedi_irq_struct *it;
-	unsigned long flags;
-
-	it = comedi_irqs[dev->irq];
-	/* drivers might not be using an interrupt for commands,
-	   or we might not have been able to get an unshared irq */
-	if (it == NULL)
-		return -1;
-
-	comedi_spin_lock_irqsave(&dev->spinlock, flags);
-
-	if (!dev->rt)
-		comedi_rt_get_irq(it);
-
-	dev->rt++;
-	it->rt = 1;
-
-	comedi_spin_unlock_irqrestore(&dev->spinlock, flags);
-
-	return 0;
-}
-
-void comedi_switch_to_non_rt(struct comedi_device *dev)
-{
-	struct comedi_irq_struct *it;
-	unsigned long flags;
-
-	it = comedi_irqs[dev->irq];
-	if (it == NULL)
-		return;
-
-	comedi_spin_lock_irqsave(&dev->spinlock, flags);
-
-	dev->rt--;
-	if (!dev->rt)
-		comedi_rt_release_irq(it);
-
-	it->rt = 0;
-
-	comedi_spin_unlock_irqrestore(&dev->spinlock, flags);
-}
-
-void wake_up_int_handler(int arg1, void *arg2)
-{
-	wake_up_interruptible((wait_queue_head_t *) arg2);
-}
-
-void comedi_rt_pend_wakeup(wait_queue_head_t *q)
-{
-	rt_pend_call(wake_up_int_handler, 0, q);
-}
-
-/* RTAI section */
-#ifdef CONFIG_COMEDI_RTAI
-
-#ifndef HAVE_RT_REQUEST_IRQ_WITH_ARG
-#define DECLARE_VOID_IRQ(irq) \
-static void handle_void_irq_ ## irq (void){ handle_void_irq(irq); }
-
-static void handle_void_irq(int irq)
-{
-	struct comedi_irq_struct *it;
-
-	it = comedi_irqs[irq];
-	if (it == NULL) {
-		rt_printk("comedi: null irq struct?\n");
-		return;
-	}
-	it->handler(irq, it->dev_id);
-	rt_enable_irq(irq);	/* needed by rtai-adeos, seems like it shouldn't hurt earlier versions */
-}
-
-DECLARE_VOID_IRQ(0);
-DECLARE_VOID_IRQ(1);
-DECLARE_VOID_IRQ(2);
-DECLARE_VOID_IRQ(3);
-DECLARE_VOID_IRQ(4);
-DECLARE_VOID_IRQ(5);
-DECLARE_VOID_IRQ(6);
-DECLARE_VOID_IRQ(7);
-DECLARE_VOID_IRQ(8);
-DECLARE_VOID_IRQ(9);
-DECLARE_VOID_IRQ(10);
-DECLARE_VOID_IRQ(11);
-DECLARE_VOID_IRQ(12);
-DECLARE_VOID_IRQ(13);
-DECLARE_VOID_IRQ(14);
-DECLARE_VOID_IRQ(15);
-DECLARE_VOID_IRQ(16);
-DECLARE_VOID_IRQ(17);
-DECLARE_VOID_IRQ(18);
-DECLARE_VOID_IRQ(19);
-DECLARE_VOID_IRQ(20);
-DECLARE_VOID_IRQ(21);
-DECLARE_VOID_IRQ(22);
-DECLARE_VOID_IRQ(23);
-
-static void handle_void_irq_ptrs[] = {
-	handle_void_irq_0,
-	handle_void_irq_1,
-	handle_void_irq_2,
-	handle_void_irq_3,
-	handle_void_irq_4,
-	handle_void_irq_5,
-	handle_void_irq_6,
-	handle_void_irq_7,
-	handle_void_irq_8,
-	handle_void_irq_9,
-	handle_void_irq_10,
-	handle_void_irq_11,
-	handle_void_irq_12,
-	handle_void_irq_13,
-	handle_void_irq_14,
-	handle_void_irq_15,
-	handle_void_irq_16,
-	handle_void_irq_17,
-	handle_void_irq_18,
-	handle_void_irq_19,
-	handle_void_irq_20,
-	handle_void_irq_21,
-	handle_void_irq_22,
-	handle_void_irq_23,
-};
-
-static int comedi_rt_get_irq(struct comedi_irq_struct *it)
-{
-	rt_request_global_irq(it->irq, handle_void_irq_ptrs[it->irq]);
-	rt_startup_irq(it->irq);
-
-	return 0;
-}
-
-static int comedi_rt_release_irq(struct comedi_irq_struct *it)
-{
-	rt_shutdown_irq(it->irq);
-	rt_free_global_irq(it->irq);
-	return 0;
-}
-#else
-
-static int comedi_rt_get_irq(struct comedi_irq_struct *it)
-{
-	int ret;
-
-	ret = rt_request_global_irq_arg(it->irq, it->handler, it->flags,
-		it->device, it->dev_id);
-	if (ret < 0) {
-		rt_printk("rt_request_global_irq_arg() returned %d\n", ret);
-		return ret;
-	}
-	rt_startup_irq(it->irq);
-
-	return 0;
-}
-
-static int comedi_rt_release_irq(struct comedi_irq_struct *it)
-{
-	rt_shutdown_irq(it->irq);
-	rt_free_global_irq(it->irq);
-	return 0;
-}
-#endif
-
-void comedi_rt_init(void)
-{
-	rt_mount_rtai();
-	rt_pend_tq_init();
-}
-
-void comedi_rt_cleanup(void)
-{
-	rt_umount_rtai();
-	rt_pend_tq_cleanup();
-}
-
-#endif
-
-/* Fusion section */
-#ifdef CONFIG_COMEDI_FUSION
-
-static void fusion_handle_irq(unsigned int irq, void *cookie)
-{
-	struct comedi_irq_struct *it = cookie;
-
-	it->handler(irq, it->dev_id);
-	rthal_irq_enable(irq);
-}
-
-static int comedi_rt_get_irq(struct comedi_irq_struct *it)
-{
-	rthal_irq_request(it->irq, fusion_handle_irq, it);
-	rthal_irq_enable(it->irq);
-	return 0;
-}
-
-static int comedi_rt_release_irq(struct comedi_irq_struct *it)
-{
-	rthal_irq_disable(it->irq);
-	rthal_irq_release(it->irq);
-	return 0;
-}
-
-void comedi_rt_init(void)
-{
-	rt_pend_tq_init();
-}
-
-void comedi_rt_cleanup(void)
-{
-	rt_pend_tq_cleanup();
-}
-
-#endif /*CONFIG_COMEDI_FUSION */
-
-/* RTLinux section */
-#ifdef CONFIG_COMEDI_RTL
-
-static unsigned int handle_rtl_irq(unsigned int irq)
-{
-	struct comedi_irq_struct *it;
-
-	it = comedi_irqs[irq];
-	if (it == NULL)
-		return 0;
-	it->handler(irq, it->dev_id);
-	rtl_hard_enable_irq(irq);
-	return 0;
-}
-
-static int comedi_rt_get_irq(struct comedi_irq_struct *it)
-{
-	rtl_request_global_irq(it->irq, handle_rtl_irq);
-	return 0;
-}
-
-static int comedi_rt_release_irq(struct comedi_irq_struct *it)
-{
-	rtl_free_global_irq(it->irq);
-	return 0;
-}
-
-void comedi_rt_init(void)
-{
-	rt_pend_tq_init();
-}
-
-void comedi_rt_cleanup(void)
-{
-	rt_pend_tq_cleanup();
-}
-
-#endif
-
-#ifdef CONFIG_COMEDI_PIRQ
-static int comedi_rt_get_irq(struct comedi_irq_struct *it)
-{
-	int ret;
-
-	free_irq(it->irq, it->dev_id);
-	ret = request_irq(it->irq, it->handler, it->flags | SA_PRIORITY,
-		it->device, it->dev_id);
-
-	return ret;
-}
-
-static int comedi_rt_release_irq(struct comedi_irq_struct *it)
-{
-	int ret;
-
-	free_irq(it->irq, it->dev_id);
-	ret = request_irq(it->irq, it->handler, it->flags,
-		it->device, it->dev_id);
-
-	return ret;
-}
-
-void comedi_rt_init(void)
-{
-	/* rt_pend_tq_init(); */
-}
-
-void comedi_rt_cleanup(void)
-{
-	/* rt_pend_tq_cleanup(); */
-}
-#endif
diff --git a/drivers/staging/comedi/rt_pend_tq.c b/drivers/staging/comedi/rt_pend_tq.c
deleted file mode 100644
index f6e083d553d9..000000000000
--- a/drivers/staging/comedi/rt_pend_tq.c
+++ /dev/null
@@ -1,113 +0,0 @@
-#define __NO_VERSION__
-/* rt_pend_tq.c */
-#include <linux/kernel.h>
-#include <linux/errno.h>
-#include <linux/sched.h>
-#include "comedidev.h"	/* for rt spinlocks */
-#include "rt_pend_tq.h"
-#ifdef CONFIG_COMEDI_RTAI
-#include <rtai.h>
-#endif
-#ifdef CONFIG_COMEDI_FUSION
-#include <nucleus/asm/hal.h>
-#endif
-#ifdef CONFIG_COMEDI_RTL
-#include <rtl_core.h>
-#endif
-
-#ifdef standalone
-#include <linux/module.h>
-#define rt_pend_tq_init init_module
-#define rt_pend_tq_cleanup cleanup_module
-#endif
-
-volatile static struct rt_pend_tq rt_pend_tq[RT_PEND_TQ_SIZE];
-volatile static struct rt_pend_tq *volatile rt_pend_head = rt_pend_tq,
-	*volatile rt_pend_tail = rt_pend_tq;
-int rt_pend_tq_irq = 0;
-DEFINE_SPINLOCK(rt_pend_tq_lock);
-
-/* WARNING: following code not checked against race conditions yet. */
-#define INC_CIRCULAR_PTR (ptr, begin, size) do {if (++ (ptr)>= (begin)+ (size)) (ptr)= (begin); } while (0)
-#define DEC_CIRCULAR_PTR (ptr, begin, size) do {if (-- (ptr)< (begin)) (ptr)= (begin)+ (size)-1; } while (0)
-
-int rt_pend_call(void (*func) (int arg1, void *arg2), int arg1, void *arg2)
-{
-	unsigned long flags;
-
-	if (func == NULL)
-		return -EINVAL;
-	if (rt_pend_tq_irq <= 0)
-		return -ENODEV;
-	comedi_spin_lock_irqsave(&rt_pend_tq_lock, flags);
-	INC_CIRCULAR_PTR(rt_pend_head, rt_pend_tq, RT_PEND_TQ_SIZE);
-	if (rt_pend_head == rt_pend_tail) {
-		/* overflow, we just refuse to take this request */
-		DEC_CIRCULAR_PTR(rt_pend_head, rt_pend_tq, RT_PEND_TQ_SIZE);
-		comedi_spin_unlock_irqrestore(&rt_pend_tq_lock, flags);
-		return -EAGAIN;
-	}
-	rt_pend_head->func = func;
-	rt_pend_head->arg1 = arg1;
-	rt_pend_head->arg2 = arg2;
-	comedi_spin_unlock_irqrestore(&rt_pend_tq_lock, flags);
-#ifdef CONFIG_COMEDI_RTAI
-	rt_pend_linux_srq(rt_pend_tq_irq);
-#endif
-#ifdef CONFIG_COMEDI_FUSION
-	rthal_apc_schedule(rt_pend_tq_irq);
-#endif
-#ifdef CONFIG_COMEDI_RTL
-	rtl_global_pend_irq(rt_pend_tq_irq);
-
-#endif
-	return 0;
-}
-
-#ifdef CONFIG_COMEDI_RTAI
-void rt_pend_irq_handler(void)
-#elif defined(CONFIG_COMEDI_FUSION)
-void rt_pend_irq_handler(void *cookie)
-#elif defined(CONFIG_COMEDI_RTL)
-void rt_pend_irq_handler(int irq, void *dev)
-#endif
-{
-	while (rt_pend_head != rt_pend_tail) {
-		INC_CIRCULAR_PTR(rt_pend_tail, rt_pend_tq, RT_PEND_TQ_SIZE);
-		rt_pend_tail->func(rt_pend_tail->arg1, rt_pend_tail->arg2);
-	}
-}
-
-int rt_pend_tq_init(void)
-{
-	rt_pend_head = rt_pend_tail = rt_pend_tq;
-#ifdef CONFIG_COMEDI_RTAI
-	rt_pend_tq_irq = rt_request_srq(0, rt_pend_irq_handler, NULL);
-#endif
-#ifdef CONFIG_COMEDI_FUSION
-	rt_pend_tq_irq =
-		rthal_apc_alloc("comedi APC", rt_pend_irq_handler, NULL);
-#endif
-#ifdef CONFIG_COMEDI_RTL
-	rt_pend_tq_irq = rtl_get_soft_irq(rt_pend_irq_handler, "rt_pend_irq");
-#endif
-	if (rt_pend_tq_irq > 0)
-		printk("rt_pend_tq: RT bottom half scheduler initialized OK\n");
-	else
-		printk("rt_pend_tq: rtl_get_soft_irq failed\n");
-	return 0;
-}
-
-void rt_pend_tq_cleanup(void)
-{
-	printk("rt_pend_tq: unloading\n");
-#ifdef CONFIG_COMEDI_RTAI
-	rt_free_srq(rt_pend_tq_irq);
-#endif
-#ifdef CONFIG_COMEDI_FUSION
-	rthal_apc_free(rt_pend_tq_irq);
-#endif
-#ifdef CONFIG_COMEDI_RTL
-	free_irq(rt_pend_tq_irq, NULL);
-#endif
-}
diff --git a/drivers/staging/comedi/rt_pend_tq.h b/drivers/staging/comedi/rt_pend_tq.h
deleted file mode 100644
index 01ed71bf409d..000000000000
--- a/drivers/staging/comedi/rt_pend_tq.h
+++ /dev/null
@@ -1,10 +0,0 @@
-#define RT_PEND_TQ_SIZE 16
-struct rt_pend_tq {
-	void (*func) (int arg1, void *arg2);
-	int arg1;
-	void *arg2;
-};
-extern int rt_pend_call(void (*func) (int arg1, void *arg2), int arg1,
-	void *arg2);
-extern int rt_pend_tq_init(void);
-extern void rt_pend_tq_cleanup(void);