Staging: rt2870: Revert d44ca7 Removal of kernel_thread() API

commit 2c63abf9e8a51dec886da482dfd8ae752581a61c upstream.

[Mike Galbraith did the upstream revert, which was more complex]

Staging: rt2870: Revert d44ca7 Removal of kernel_thread() API

The sanity check this patch introduced triggers on shutdown, apparently due to
threads having already exited by the time BUG_ON() is reached.

Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Teoh <htmldeveloper@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

7 files changed, 74 insertions, 53 deletions

diff --git a/drivers/staging/rt2870/2870_main_dev.c b/drivers/staging/rt2870/2870_main_dev.c
index 9d59e3167fe4..04c764d95d77 100644
--- a/drivers/staging/rt2870/2870_main_dev.c
+++ b/drivers/staging/rt2870/2870_main_dev.c
@@ -265,7 +265,7 @@ INT MlmeThread(
 	 */
 	DBGPRINT(RT_DEBUG_TRACE,( "<---%s\n",__func__));
 
-	pObj->MLMEThr_task = NULL;
+	pObj->MLMEThr_pid = THREAD_PID_INIT_VALUE;
 
 	complete_and_exit (&pAd->mlmeComplete, 0);
 	return 0;
@@ -373,7 +373,7 @@ INT RTUSBCmdThread(
 	 */
 	DBGPRINT(RT_DEBUG_TRACE,( "<---RTUSBCmdThread\n"));
 
-	pObj->RTUSBCmdThr_task = NULL;
+	pObj->RTUSBCmdThr_pid = THREAD_PID_INIT_VALUE;
 
 	complete_and_exit (&pAd->CmdQComplete, 0);
 	return 0;
@@ -467,7 +467,7 @@ INT TimerQThread(
 	 */
 	DBGPRINT(RT_DEBUG_TRACE,( "<---%s\n",__func__));
 
-	pObj->TimerQThr_task = NULL;
+	pObj->TimerQThr_pid = THREAD_PID_INIT_VALUE;
 
 	complete_and_exit(&pAd->TimerQComplete, 0);
 	return 0;
@@ -944,46 +944,69 @@ VOID RT28xxThreadTerminate(
 	RTUSBCancelPendingIRPs(pAd);
 
 	// Terminate Threads
-	BUG_ON(pObj->TimerQThr_task == NULL);
-	CHECK_PID_LEGALITY(task_pid(pObj->TimerQThr_task))
+	CHECK_PID_LEGALITY(pObj->TimerQThr_pid)
 	{
 		POS_COOKIE pObj = (POS_COOKIE)pAd->OS_Cookie;
 
-		printk(KERN_DEBUG "Terminate the TimerQThr pid=%d!\n",
-			pid_nr(task_pid(pObj->TimerQThr_task)));
+		printk("Terminate the TimerQThr_pid=%d!\n", GET_PID_NUMBER(pObj->TimerQThr_pid));
 		mb();
 		pAd->TimerFunc_kill = 1;
 		mb();
-		kthread_stop(pObj->TimerQThr_task);
-		pObj->TimerQThr_task = NULL;
+		ret = KILL_THREAD_PID(pObj->TimerQThr_pid, SIGTERM, 1);
+		if (ret)
+		{
+			printk(KERN_WARNING "%s: unable to stop TimerQThread, pid=%d, ret=%d!\n",
+					pAd->net_dev->name, GET_PID_NUMBER(pObj->TimerQThr_pid), ret);
+		}
+		else
+		{
+			wait_for_completion(&pAd->TimerQComplete);
+			pObj->TimerQThr_pid = THREAD_PID_INIT_VALUE;
+		}
 	}
 
-	BUG_ON(pObj->MLMEThr_task == NULL);
-	CHECK_PID_LEGALITY(task_pid(pObj->MLMEThr_task))
+	CHECK_PID_LEGALITY(pObj->MLMEThr_pid)
 	{
-		printk(KERN_DEBUG "Terminate the MLMEThr pid=%d!\n",
-			pid_nr(task_pid(pObj->MLMEThr_task)));
+		printk("Terminate the MLMEThr_pid=%d!\n", GET_PID_NUMBER(pObj->MLMEThr_pid));
 		mb();
 		pAd->mlme_kill = 1;
 		//RT28XX_MLME_HANDLER(pAd);
 		mb();
-		kthread_stop(pObj->MLMEThr_task);
-		pObj->MLMEThr_task = NULL;
+		ret = KILL_THREAD_PID(pObj->MLMEThr_pid, SIGTERM, 1);
+		if (ret)
+		{
+			printk (KERN_WARNING "%s: unable to Mlme thread, pid=%d, ret=%d!\n",
+					pAd->net_dev->name, GET_PID_NUMBER(pObj->MLMEThr_pid), ret);
+		}
+		else
+		{
+			//wait_for_completion (&pAd->notify);
+			wait_for_completion (&pAd->mlmeComplete);
+			pObj->MLMEThr_pid = THREAD_PID_INIT_VALUE;
+		}
 	}
 
-	BUG_ON(pObj->RTUSBCmdThr_task == NULL);
-	CHECK_PID_LEGALITY(task_pid(pObj->RTUSBCmdThr_task))
+	CHECK_PID_LEGALITY(pObj->RTUSBCmdThr_pid)
 	{
-		printk(KERN_DEBUG "Terminate the RTUSBCmdThr pid=%d!\n",
-			pid_nr(task_pid(pObj->RTUSBCmdThr_task)));
+		printk("Terminate the RTUSBCmdThr_pid=%d!\n", GET_PID_NUMBER(pObj->RTUSBCmdThr_pid));
 		mb();
 		NdisAcquireSpinLock(&pAd->CmdQLock);
 		pAd->CmdQ.CmdQState = RT2870_THREAD_STOPED;
 		NdisReleaseSpinLock(&pAd->CmdQLock);
 		mb();
 		//RTUSBCMDUp(pAd);
-		kthread_stop(pObj->RTUSBCmdThr_task);
-		pObj->RTUSBCmdThr_task = NULL;
+		ret = KILL_THREAD_PID(pObj->RTUSBCmdThr_pid, SIGTERM, 1);
+		if (ret)
+		{
+			printk(KERN_WARNING "%s: unable to RTUSBCmd thread, pid=%d, ret=%d!\n",
+					pAd->net_dev->name, GET_PID_NUMBER(pObj->RTUSBCmdThr_pid), ret);
+		}
+		else
+		{
+			//wait_for_completion (&pAd->notify);
+			wait_for_completion (&pAd->CmdQComplete);
+			pObj->RTUSBCmdThr_pid = THREAD_PID_INIT_VALUE;
+	}
 	}
 
 
@@ -1044,7 +1067,7 @@ BOOLEAN RT28XXChipsetCheck(
 		if (dev_p->descriptor.idVendor == rtusb_usb_id[i].idVendor &&
 			dev_p->descriptor.idProduct == rtusb_usb_id[i].idProduct)
 		{
-			printk(KERN_DEBUG "rt2870: idVendor = 0x%x, idProduct = 0x%x\n",
+			printk("rt2870: idVendor = 0x%x, idProduct = 0x%x\n",
 					dev_p->descriptor.idVendor, dev_p->descriptor.idProduct);
 			break;
 		}
diff --git a/drivers/staging/rt2870/common/2870_rtmp_init.c b/drivers/staging/rt2870/common/2870_rtmp_init.c
index cb16d2fcf60a..9f5143b3922e 100644
--- a/drivers/staging/rt2870/common/2870_rtmp_init.c
+++ b/drivers/staging/rt2870/common/2870_rtmp_init.c
@@ -727,8 +727,8 @@ NDIS_STATUS AdapterBlockAllocateMemory(
 
 	usb_dev = pObj->pUsb_Dev;
 
-	pObj->MLMEThr_task		= NULL;
-	pObj->RTUSBCmdThr_task	= NULL;
+	pObj->MLMEThr_pid		= THREAD_PID_INIT_VALUE;
+	pObj->RTUSBCmdThr_pid	= THREAD_PID_INIT_VALUE;
 
 	*ppAd = (PVOID)vmalloc(sizeof(RTMP_ADAPTER));
 
@@ -765,7 +765,7 @@ NDIS_STATUS	 CreateThreads(
 {
 	PRTMP_ADAPTER pAd = net_dev->ml_priv;
 	POS_COOKIE pObj = (POS_COOKIE) pAd->OS_Cookie;
-	struct task_struct *tsk;
+	pid_t pid_number = -1;
 
 	//init_MUTEX(&(pAd->usbdev_semaphore));
 
@@ -779,39 +779,36 @@ NDIS_STATUS	 CreateThreads(
 	init_completion (&pAd->TimerQComplete);
 
 	// Creat MLME Thread
-	pObj->MLMEThr_task = NULL;
-	tsk = kthread_run(MlmeThread, pAd, pAd->net_dev->name);
-
-	if (IS_ERR(tsk)) {
+	pObj->MLMEThr_pid= THREAD_PID_INIT_VALUE;
+	pid_number = kernel_thread(MlmeThread, pAd, CLONE_VM);
+	if (pid_number < 0)
+	{
 		printk (KERN_WARNING "%s: unable to start Mlme thread\n",pAd->net_dev->name);
 		return NDIS_STATUS_FAILURE;
 	}
-
-	pObj->MLMEThr_task = tsk;
+	pObj->MLMEThr_pid = GET_PID(pid_number);
 	// Wait for the thread to start
 	wait_for_completion(&(pAd->mlmeComplete));
 
 	// Creat Command Thread
-	pObj->RTUSBCmdThr_task = NULL;
-	tsk = kthread_run(RTUSBCmdThread, pAd, pAd->net_dev->name);
-
-	if (IS_ERR(tsk) < 0)
+	pObj->RTUSBCmdThr_pid= THREAD_PID_INIT_VALUE;
+	pid_number = kernel_thread(RTUSBCmdThread, pAd, CLONE_VM);
+	if (pid_number < 0)
 	{
 		printk (KERN_WARNING "%s: unable to start RTUSBCmd thread\n",pAd->net_dev->name);
 		return NDIS_STATUS_FAILURE;
 	}
-
-	pObj->RTUSBCmdThr_task = tsk;
+	pObj->RTUSBCmdThr_pid = GET_PID(pid_number);
 	wait_for_completion(&(pAd->CmdQComplete));
 
-	pObj->TimerQThr_task = NULL;
-	tsk = kthread_run(TimerQThread, pAd, pAd->net_dev->name);
-	if (IS_ERR(tsk) < 0)
+	pObj->TimerQThr_pid= THREAD_PID_INIT_VALUE;
+	pid_number = kernel_thread(TimerQThread, pAd, CLONE_VM);
+	if (pid_number < 0)
 	{
 		printk (KERN_WARNING "%s: unable to start TimerQThread\n",pAd->net_dev->name);
 		return NDIS_STATUS_FAILURE;
 	}
-	pObj->TimerQThr_task = tsk;
+	pObj->TimerQThr_pid = GET_PID(pid_number);
 	// Wait for the thread to start
 	wait_for_completion(&(pAd->TimerQComplete));
 
diff --git a/drivers/staging/rt2870/common/cmm_data.c b/drivers/staging/rt2870/common/cmm_data.c
index f8e0ebd7bca9..fd809abf6df0 100644
--- a/drivers/staging/rt2870/common/cmm_data.c
+++ b/drivers/staging/rt2870/common/cmm_data.c
@@ -709,6 +709,9 @@ BOOLEAN RTMP_FillTxBlkInfo(
 	}
 
 	return TRUE;
+
+FillTxBlkErr:
+	return FALSE;
 }
 
 
diff --git a/drivers/staging/rt2870/common/rtmp_init.c b/drivers/staging/rt2870/common/rtmp_init.c
index 099b6a806f86..870a00da3dac 100644
--- a/drivers/staging/rt2870/common/rtmp_init.c
+++ b/drivers/staging/rt2870/common/rtmp_init.c
@@ -3655,7 +3655,7 @@ VOID	UserCfgInit(
 #ifdef RALINK_28xx_QA
 	//pAd->ate.Repeat = 0;
 	pAd->ate.TxStatus = 0;
-	pAd->ate.AtePid = NULL;
+	pAd->ate.AtePid = THREAD_PID_INIT_VALUE;
 #endif // RALINK_28xx_QA //
 #endif // RALINK_ATE //
 
diff --git a/drivers/staging/rt2870/common/rtusb_io.c b/drivers/staging/rt2870/common/rtusb_io.c
index afde136a9a0c..6db443e9268c 100644
--- a/drivers/staging/rt2870/common/rtusb_io.c
+++ b/drivers/staging/rt2870/common/rtusb_io.c
@@ -958,8 +958,7 @@ NDIS_STATUS	RTUSBEnqueueCmdFromNdis(
 	POS_COOKIE pObj = (POS_COOKIE) pAd->OS_Cookie;
 
 
-	BUG_ON(pObj->RTUSBCmdThr_task == NULL);
-	CHECK_PID_LEGALITY(task_pid(pObj->RTUSBCmdThr_task))
+	CHECK_PID_LEGALITY(pObj->RTUSBCmdThr_pid)
 		return (NDIS_STATUS_RESOURCES);
 
 	status = RTMPAllocateMemory((PVOID *)&cmdqelmt, sizeof(CmdQElmt));
diff --git a/drivers/staging/rt2870/rt2870.h b/drivers/staging/rt2870/rt2870.h
index fef14a4e2164..39fa918dce1d 100644
--- a/drivers/staging/rt2870/rt2870.h
+++ b/drivers/staging/rt2870/rt2870.h
@@ -580,16 +580,14 @@ VOID RTUSBBulkRxComplete(purbb_t pUrb, struct pt_regs *pt_regs);
 #define RTUSBMlmeUp(pAd)	        \
 {								    \
 	POS_COOKIE pObj = (POS_COOKIE) pAd->OS_Cookie;	\
-	BUG_ON(pObj->MLMEThr_task == NULL);		    \
-	CHECK_PID_LEGALITY(task_pid(pObj->MLMEThr_task))		    \
+	CHECK_PID_LEGALITY(pObj->MLMEThr_pid)		    \
         up(&(pAd->mlme_semaphore)); \
 }
 
 #define RTUSBCMDUp(pAd)	                \
 {									    \
 	POS_COOKIE pObj = (POS_COOKIE) pAd->OS_Cookie;	\
-	BUG_ON(pObj->RTUSBCmdThr_task == NULL);	    \
-	CHECK_PID_LEGALITY(task_pid(pObj->RTUSBCmdThr_task))	    \
+	CHECK_PID_LEGALITY(pObj->RTUSBCmdThr_pid)	    \
 	    up(&(pAd->RTUSBCmd_semaphore)); \
 }
 
diff --git a/drivers/staging/rt2870/rt_linux.h b/drivers/staging/rt2870/rt_linux.h
index 5a6ee6ad0e52..49ad37f00637 100644
--- a/drivers/staging/rt2870/rt_linux.h
+++ b/drivers/staging/rt2870/rt_linux.h
@@ -44,7 +44,6 @@
 #include <linux/module.h>
 #include <linux/version.h>
 #include <linux/kernel.h>
-#include <linux/kthread.h>
 
 #include <linux/spinlock.h>
 #include <linux/init.h>
@@ -166,12 +165,14 @@ typedef int (*HARD_START_XMIT_FUNC)(struct sk_buff *skb, struct net_device *net_
 
 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,27)
 typedef	struct pid *	THREAD_PID;
+#define	THREAD_PID_INIT_VALUE	NULL
 #define	GET_PID(_v)	find_get_pid(_v)
 #define	GET_PID_NUMBER(_v)	pid_nr(_v)
 #define CHECK_PID_LEGALITY(_pid)	if (pid_nr(_pid) >= 0)
 #define KILL_THREAD_PID(_A, _B, _C)	kill_pid(_A, _B, _C)
 #else
 typedef	pid_t	THREAD_PID;
+#define	THREAD_PID_INIT_VALUE	-1
 #define	GET_PID(_v)	_v
 #define	GET_PID_NUMBER(_v)	_v
 #define CHECK_PID_LEGALITY(_pid)	if (_pid >= 0)
@@ -187,11 +188,11 @@ struct os_lock  {
 struct os_cookie {
 
 #ifdef RT2870
-	struct usb_device	*pUsb_Dev;
+	struct usb_device		*pUsb_Dev;
 
-	struct task_struct	*MLMEThr_task;
-	struct task_struct	*RTUSBCmdThr_task;
-	struct task_struct	*TimerQThr_task;
+	THREAD_PID				MLMEThr_pid;
+	THREAD_PID				RTUSBCmdThr_pid;
+	THREAD_PID				TimerQThr_pid;
 #endif // RT2870 //
 
 	struct tasklet_struct 	rx_done_task;