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Diffstat (limited to 'sound/drivers/aloop.c')
-rw-r--r--sound/drivers/aloop.c52
1 files changed, 27 insertions, 25 deletions
diff --git a/sound/drivers/aloop.c b/sound/drivers/aloop.c
index 0fe6d64ff840..3d822328d383 100644
--- a/sound/drivers/aloop.c
+++ b/sound/drivers/aloop.c
@@ -120,7 +120,6 @@ struct loopback_pcm {
unsigned int last_drift;
unsigned long last_jiffies;
struct timer_list timer;
- spinlock_t timer_lock;
};
static struct platform_device *devices[SNDRV_CARDS];
@@ -166,12 +165,12 @@ static inline unsigned int get_rate_shift(struct loopback_pcm *dpcm)
return get_setup(dpcm)->rate_shift;
}
+/* call in cable->lock */
static void loopback_timer_start(struct loopback_pcm *dpcm)
{
unsigned long tick;
unsigned int rate_shift = get_rate_shift(dpcm);
- spin_lock(&dpcm->timer_lock);
if (rate_shift != dpcm->pcm_rate_shift) {
dpcm->pcm_rate_shift = rate_shift;
dpcm->period_size_frac = frac_pos(dpcm, dpcm->pcm_period_size);
@@ -184,15 +183,13 @@ static void loopback_timer_start(struct loopback_pcm *dpcm)
tick = (tick + dpcm->pcm_bps - 1) / dpcm->pcm_bps;
dpcm->timer.expires = jiffies + tick;
add_timer(&dpcm->timer);
- spin_unlock(&dpcm->timer_lock);
}
+/* call in cable->lock */
static inline void loopback_timer_stop(struct loopback_pcm *dpcm)
{
- spin_lock(&dpcm->timer_lock);
del_timer(&dpcm->timer);
dpcm->timer.expires = 0;
- spin_unlock(&dpcm->timer_lock);
}
#define CABLE_VALID_PLAYBACK (1 << SNDRV_PCM_STREAM_PLAYBACK)
@@ -274,8 +271,8 @@ static int loopback_trigger(struct snd_pcm_substream *substream, int cmd)
spin_lock(&cable->lock);
cable->running |= stream;
cable->pause &= ~stream;
- spin_unlock(&cable->lock);
loopback_timer_start(dpcm);
+ spin_unlock(&cable->lock);
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
loopback_active_notify(dpcm);
break;
@@ -283,23 +280,23 @@ static int loopback_trigger(struct snd_pcm_substream *substream, int cmd)
spin_lock(&cable->lock);
cable->running &= ~stream;
cable->pause &= ~stream;
- spin_unlock(&cable->lock);
loopback_timer_stop(dpcm);
+ spin_unlock(&cable->lock);
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
loopback_active_notify(dpcm);
break;
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
spin_lock(&cable->lock);
cable->pause |= stream;
- spin_unlock(&cable->lock);
loopback_timer_stop(dpcm);
+ spin_unlock(&cable->lock);
break;
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
spin_lock(&cable->lock);
dpcm->last_jiffies = jiffies;
cable->pause &= ~stream;
- spin_unlock(&cable->lock);
loopback_timer_start(dpcm);
+ spin_unlock(&cable->lock);
break;
default:
return -EINVAL;
@@ -477,6 +474,7 @@ static inline void bytepos_finish(struct loopback_pcm *dpcm,
dpcm->buf_pos %= dpcm->pcm_buffer_size;
}
+/* call in cable->lock */
static unsigned int loopback_pos_update(struct loopback_cable *cable)
{
struct loopback_pcm *dpcm_play =
@@ -485,9 +483,7 @@ static unsigned int loopback_pos_update(struct loopback_cable *cable)
cable->streams[SNDRV_PCM_STREAM_CAPTURE];
unsigned long delta_play = 0, delta_capt = 0;
unsigned int running, count1, count2;
- unsigned long flags;
- spin_lock_irqsave(&cable->lock, flags);
running = cable->running ^ cable->pause;
if (running & (1 << SNDRV_PCM_STREAM_PLAYBACK)) {
delta_play = jiffies - dpcm_play->last_jiffies;
@@ -529,32 +525,39 @@ static unsigned int loopback_pos_update(struct loopback_cable *cable)
bytepos_finish(dpcm_play, count1);
bytepos_finish(dpcm_capt, count1);
unlock:
- spin_unlock_irqrestore(&cable->lock, flags);
return running;
}
static void loopback_timer_function(unsigned long data)
{
struct loopback_pcm *dpcm = (struct loopback_pcm *)data;
- unsigned int running;
+ unsigned long flags;
- running = loopback_pos_update(dpcm->cable);
- if (running & (1 << dpcm->substream->stream)) {
+ spin_lock_irqsave(&dpcm->cable->lock, flags);
+ if (loopback_pos_update(dpcm->cable) & (1 << dpcm->substream->stream)) {
loopback_timer_start(dpcm);
if (dpcm->period_update_pending) {
dpcm->period_update_pending = 0;
+ spin_unlock_irqrestore(&dpcm->cable->lock, flags);
+ /* need to unlock before calling below */
snd_pcm_period_elapsed(dpcm->substream);
+ return;
}
}
+ spin_unlock_irqrestore(&dpcm->cable->lock, flags);
}
static snd_pcm_uframes_t loopback_pointer(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct loopback_pcm *dpcm = runtime->private_data;
+ snd_pcm_uframes_t pos;
+ spin_lock(&dpcm->cable->lock);
loopback_pos_update(dpcm->cable);
- return bytes_to_frames(runtime, dpcm->buf_pos);
+ pos = dpcm->buf_pos;
+ spin_unlock(&dpcm->cable->lock);
+ return bytes_to_frames(runtime, pos);
}
static struct snd_pcm_hardware loopback_pcm_hardware =
@@ -672,7 +675,6 @@ static int loopback_open(struct snd_pcm_substream *substream)
dpcm->substream = substream;
setup_timer(&dpcm->timer, loopback_timer_function,
(unsigned long)dpcm);
- spin_lock_init(&dpcm->timer_lock);
cable = loopback->cables[substream->number][dev];
if (!cable) {
@@ -772,8 +774,8 @@ static struct snd_pcm_ops loopback_capture_ops = {
.mmap = snd_pcm_lib_mmap_vmalloc,
};
-static int __devinit loopback_pcm_new(struct loopback *loopback,
- int device, int substreams)
+static int loopback_pcm_new(struct loopback *loopback,
+ int device, int substreams)
{
struct snd_pcm *pcm;
int err;
@@ -947,7 +949,7 @@ static int loopback_channels_get(struct snd_kcontrol *kcontrol,
return 0;
}
-static struct snd_kcontrol_new loopback_controls[] __devinitdata = {
+static struct snd_kcontrol_new loopback_controls[] = {
{
.iface = SNDRV_CTL_ELEM_IFACE_PCM,
.name = "PCM Rate Shift 100000",
@@ -996,7 +998,7 @@ static struct snd_kcontrol_new loopback_controls[] __devinitdata = {
}
};
-static int __devinit loopback_mixer_new(struct loopback *loopback, int notify)
+static int loopback_mixer_new(struct loopback *loopback, int notify)
{
struct snd_card *card = loopback->card;
struct snd_pcm *pcm;
@@ -1109,7 +1111,7 @@ static void print_cable_info(struct snd_info_entry *entry,
mutex_unlock(&loopback->cable_lock);
}
-static int __devinit loopback_proc_new(struct loopback *loopback, int cidx)
+static int loopback_proc_new(struct loopback *loopback, int cidx)
{
char name[32];
struct snd_info_entry *entry;
@@ -1130,7 +1132,7 @@ static int __devinit loopback_proc_new(struct loopback *loopback, int cidx)
#endif
-static int __devinit loopback_probe(struct platform_device *devptr)
+static int loopback_probe(struct platform_device *devptr)
{
struct snd_card *card;
struct loopback *loopback;
@@ -1175,7 +1177,7 @@ static int __devinit loopback_probe(struct platform_device *devptr)
return err;
}
-static int __devexit loopback_remove(struct platform_device *devptr)
+static int loopback_remove(struct platform_device *devptr)
{
snd_card_free(platform_get_drvdata(devptr));
platform_set_drvdata(devptr, NULL);
@@ -1213,7 +1215,7 @@ static SIMPLE_DEV_PM_OPS(loopback_pm, loopback_suspend, loopback_resume);
static struct platform_driver loopback_driver = {
.probe = loopback_probe,
- .remove = __devexit_p(loopback_remove),
+ .remove = loopback_remove,
.driver = {
.name = SND_LOOPBACK_DRIVER,
.owner = THIS_MODULE,
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.