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Diffstat (limited to 'sound/drivers/pcsp')
-rw-r--r--sound/drivers/pcsp/pcsp.c8
-rw-r--r--sound/drivers/pcsp/pcsp.h1
-rw-r--r--sound/drivers/pcsp/pcsp_lib.c95
3 files changed, 56 insertions, 48 deletions
diff --git a/sound/drivers/pcsp/pcsp.c b/sound/drivers/pcsp/pcsp.c
index 1899cf0685bc..2a02f704f366 100644
--- a/sound/drivers/pcsp/pcsp.c
+++ b/sound/drivers/pcsp/pcsp.c
@@ -96,7 +96,7 @@ static int __devinit snd_card_pcsp_probe(int devnum, struct device *dev)
return -EINVAL;
hrtimer_init(&pcsp_chip.timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
- pcsp_chip.timer.cb_mode = HRTIMER_CB_SOFTIRQ;
+ pcsp_chip.timer.cb_mode = HRTIMER_CB_IRQSAFE_UNLOCKED;
pcsp_chip.timer.function = pcsp_do_timer;
card = snd_card_new(index, id, THIS_MODULE, 0);
@@ -188,10 +188,8 @@ static int __devexit pcsp_remove(struct platform_device *dev)
static void pcsp_stop_beep(struct snd_pcsp *chip)
{
- spin_lock_irq(&chip->substream_lock);
- if (!chip->playback_substream)
- pcspkr_stop_sound();
- spin_unlock_irq(&chip->substream_lock);
+ pcsp_sync_stop(chip);
+ pcspkr_stop_sound();
}
#ifdef CONFIG_PM
diff --git a/sound/drivers/pcsp/pcsp.h b/sound/drivers/pcsp/pcsp.h
index 1d661f795e8c..70533a333b5b 100644
--- a/sound/drivers/pcsp/pcsp.h
+++ b/sound/drivers/pcsp/pcsp.h
@@ -77,6 +77,7 @@ struct snd_pcsp {
extern struct snd_pcsp pcsp_chip;
extern enum hrtimer_restart pcsp_do_timer(struct hrtimer *handle);
+extern void pcsp_sync_stop(struct snd_pcsp *chip);
extern int snd_pcsp_new_pcm(struct snd_pcsp *chip);
extern int snd_pcsp_new_mixer(struct snd_pcsp *chip);
diff --git a/sound/drivers/pcsp/pcsp_lib.c b/sound/drivers/pcsp/pcsp_lib.c
index 1f42e4063118..f8d8470861da 100644
--- a/sound/drivers/pcsp/pcsp_lib.c
+++ b/sound/drivers/pcsp/pcsp_lib.c
@@ -8,6 +8,7 @@
#include <linux/module.h>
#include <linux/moduleparam.h>
+#include <linux/interrupt.h>
#include <sound/pcm.h>
#include <asm/io.h>
#include "pcsp.h"
@@ -19,6 +20,22 @@ MODULE_PARM_DESC(nforce_wa, "Apply NForce chipset workaround "
#define DMIX_WANTS_S16 1
+/*
+ * Call snd_pcm_period_elapsed in a tasklet
+ * This avoids spinlock messes and long-running irq contexts
+ */
+static void pcsp_call_pcm_elapsed(unsigned long priv)
+{
+ if (atomic_read(&pcsp_chip.timer_active)) {
+ struct snd_pcm_substream *substream;
+ substream = pcsp_chip.playback_substream;
+ if (substream)
+ snd_pcm_period_elapsed(substream);
+ }
+}
+
+static DECLARE_TASKLET(pcsp_pcm_tasklet, pcsp_call_pcm_elapsed, 0);
+
enum hrtimer_restart pcsp_do_timer(struct hrtimer *handle)
{
unsigned char timer_cnt, val;
@@ -28,41 +45,23 @@ enum hrtimer_restart pcsp_do_timer(struct hrtimer *handle)
struct snd_pcm_substream *substream;
struct snd_pcm_runtime *runtime;
struct snd_pcsp *chip = container_of(handle, struct snd_pcsp, timer);
+ unsigned long flags;
if (chip->thalf) {
outb(chip->val61, 0x61);
chip->thalf = 0;
if (!atomic_read(&chip->timer_active))
- return HRTIMER_NORESTART;
+ goto stop;
hrtimer_forward(&chip->timer, hrtimer_get_expires(&chip->timer),
ktime_set(0, chip->ns_rem));
return HRTIMER_RESTART;
}
- spin_lock_irq(&chip->substream_lock);
- /* Takashi Iwai says regarding this extra lock:
-
- If the irq handler handles some data on the DMA buffer, it should
- do snd_pcm_stream_lock().
- That protects basically against all races among PCM callbacks, yes.
- However, there are two remaining issues:
- 1. The substream pointer you try to lock isn't protected _before_
- this lock yet.
- 2. snd_pcm_period_elapsed() itself acquires the lock.
- The requirement of another lock is because of 1. When you get
- chip->playback_substream, it's not protected.
- Keeping this lock while snd_pcm_period_elapsed() assures the substream
- is still protected (at least, not released). And the other status is
- handled properly inside snd_pcm_stream_lock() in
- snd_pcm_period_elapsed().
-
- */
- if (!chip->playback_substream)
- goto exit_nr_unlock1;
- substream = chip->playback_substream;
- snd_pcm_stream_lock(substream);
if (!atomic_read(&chip->timer_active))
- goto exit_nr_unlock2;
+ goto stop;
+ substream = chip->playback_substream;
+ if (!substream)
+ goto stop;
runtime = substream->runtime;
fmt_size = snd_pcm_format_physical_width(runtime->format) >> 3;
@@ -87,6 +86,8 @@ enum hrtimer_restart pcsp_do_timer(struct hrtimer *handle)
period_bytes = snd_pcm_lib_period_bytes(substream);
buffer_bytes = snd_pcm_lib_buffer_bytes(substream);
+
+ spin_lock_irqsave(&chip->substream_lock, flags);
chip->playback_ptr += PCSP_INDEX_INC() * fmt_size;
periods_elapsed = chip->playback_ptr - chip->period_ptr;
if (periods_elapsed < 0) {
@@ -102,18 +103,15 @@ enum hrtimer_restart pcsp_do_timer(struct hrtimer *handle)
* or ALSA will BUG on us. */
chip->playback_ptr %= buffer_bytes;
- snd_pcm_stream_unlock(substream);
-
if (periods_elapsed) {
- snd_pcm_period_elapsed(substream);
chip->period_ptr += periods_elapsed * period_bytes;
chip->period_ptr %= buffer_bytes;
+ tasklet_schedule(&pcsp_pcm_tasklet);
}
-
- spin_unlock_irq(&chip->substream_lock);
+ spin_unlock_irqrestore(&chip->substream_lock, flags);
if (!atomic_read(&chip->timer_active))
- return HRTIMER_NORESTART;
+ goto stop;
chip->ns_rem = PCSP_PERIOD_NS();
ns = (chip->thalf ? PCSP_CALC_NS(timer_cnt) : chip->ns_rem);
@@ -122,10 +120,7 @@ enum hrtimer_restart pcsp_do_timer(struct hrtimer *handle)
ktime_set(0, ns));
return HRTIMER_RESTART;
-exit_nr_unlock2:
- snd_pcm_stream_unlock(substream);
-exit_nr_unlock1:
- spin_unlock_irq(&chip->substream_lock);
+ stop:
return HRTIMER_NORESTART;
}
@@ -165,26 +160,35 @@ static void pcsp_stop_playing(struct snd_pcsp *chip)
spin_unlock(&i8253_lock);
}
+/*
+ * Force to stop and sync the stream
+ */
+void pcsp_sync_stop(struct snd_pcsp *chip)
+{
+ local_irq_disable();
+ pcsp_stop_playing(chip);
+ local_irq_enable();
+ hrtimer_cancel(&chip->timer);
+ tasklet_kill(&pcsp_pcm_tasklet);
+}
+
static int snd_pcsp_playback_close(struct snd_pcm_substream *substream)
{
struct snd_pcsp *chip = snd_pcm_substream_chip(substream);
#if PCSP_DEBUG
printk(KERN_INFO "PCSP: close called\n");
#endif
- if (atomic_read(&chip->timer_active)) {
- printk(KERN_ERR "PCSP: timer still active\n");
- pcsp_stop_playing(chip);
- }
- spin_lock_irq(&chip->substream_lock);
+ pcsp_sync_stop(chip);
chip->playback_substream = NULL;
- spin_unlock_irq(&chip->substream_lock);
return 0;
}
static int snd_pcsp_playback_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *hw_params)
{
+ struct snd_pcsp *chip = snd_pcm_substream_chip(substream);
int err;
+ pcsp_sync_stop(chip);
err = snd_pcm_lib_malloc_pages(substream,
params_buffer_bytes(hw_params));
if (err < 0)
@@ -194,9 +198,11 @@ static int snd_pcsp_playback_hw_params(struct snd_pcm_substream *substream,
static int snd_pcsp_playback_hw_free(struct snd_pcm_substream *substream)
{
+ struct snd_pcsp *chip = snd_pcm_substream_chip(substream);
#if PCSP_DEBUG
printk(KERN_INFO "PCSP: hw_free called\n");
#endif
+ pcsp_sync_stop(chip);
return snd_pcm_lib_free_pages(substream);
}
@@ -212,6 +218,7 @@ static int snd_pcsp_playback_prepare(struct snd_pcm_substream *substream)
snd_pcm_lib_period_bytes(substream),
substream->runtime->periods);
#endif
+ pcsp_sync_stop(chip);
chip->playback_ptr = 0;
chip->period_ptr = 0;
return 0;
@@ -242,7 +249,11 @@ static snd_pcm_uframes_t snd_pcsp_playback_pointer(struct snd_pcm_substream
*substream)
{
struct snd_pcsp *chip = snd_pcm_substream_chip(substream);
- return bytes_to_frames(substream->runtime, chip->playback_ptr);
+ unsigned int pos;
+ spin_lock(&chip->substream_lock);
+ pos = chip->playback_ptr;
+ spin_unlock(&chip->substream_lock);
+ return bytes_to_frames(substream->runtime, pos);
}
static struct snd_pcm_hardware snd_pcsp_playback = {
@@ -279,9 +290,7 @@ static int snd_pcsp_playback_open(struct snd_pcm_substream *substream)
return -EBUSY;
}
runtime->hw = snd_pcsp_playback;
- spin_lock_irq(&chip->substream_lock);
chip->playback_substream = substream;
- spin_unlock_irq(&chip->substream_lock);
return 0;
}
generated by cgit v1.2.3 (git 2.0.4) at 2024-04-16 17:20:09 +0000