ALSA: ak411x: Fix race of reinit() calls
Protect the call with a mutex, as this may be called in parallel
(either from the PCM rate change and the clock change).
Acked-by: Jaroslav Kysela <perex@perex.cz>
Tested-by: Pavel Hofman <pavel.hofman@ivitera.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/include/sound/ak4113.h b/include/sound/ak4113.h
index f4fbf68..58c1456 100644
--- a/include/sound/ak4113.h
+++ b/include/sound/ak4113.h
@@ -287,6 +287,7 @@
ak4113_read_t *read;
void *private_data;
atomic_t wq_processing;
+ struct mutex reinit_mutex;
spinlock_t lock;
unsigned char regmap[AK4113_WRITABLE_REGS];
struct snd_kcontrol *kctls[AK4113_CONTROLS];
diff --git a/include/sound/ak4114.h b/include/sound/ak4114.h
index e681df2..b6feb7e 100644
--- a/include/sound/ak4114.h
+++ b/include/sound/ak4114.h
@@ -169,6 +169,7 @@
ak4114_read_t * read;
void * private_data;
atomic_t wq_processing;
+ struct mutex reinit_mutex;
spinlock_t lock;
unsigned char regmap[6];
unsigned char txcsb[5];
diff --git a/sound/i2c/other/ak4113.c b/sound/i2c/other/ak4113.c
index c2b14d9..8884488 100644
--- a/sound/i2c/other/ak4113.c
+++ b/sound/i2c/other/ak4113.c
@@ -89,6 +89,7 @@
chip->private_data = private_data;
INIT_DELAYED_WORK(&chip->work, ak4113_stats);
atomic_set(&chip->wq_processing, 0);
+ mutex_init(&chip->reinit_mutex);
for (reg = 0; reg < AK4113_WRITABLE_REGS ; reg++)
chip->regmap[reg] = pgm[reg];
@@ -141,7 +142,9 @@
{
if (atomic_inc_return(&chip->wq_processing) == 1)
cancel_delayed_work_sync(&chip->work);
+ mutex_lock(&chip->reinit_mutex);
ak4113_init_regs(chip);
+ mutex_unlock(&chip->reinit_mutex);
/* bring up statistics / event queing */
if (atomic_dec_and_test(&chip->wq_processing))
schedule_delayed_work(&chip->work, HZ / 10);
diff --git a/sound/i2c/other/ak4114.c b/sound/i2c/other/ak4114.c
index ee639f5..5a4cf3f 100644
--- a/sound/i2c/other/ak4114.c
+++ b/sound/i2c/other/ak4114.c
@@ -100,6 +100,7 @@
chip->private_data = private_data;
INIT_DELAYED_WORK(&chip->work, ak4114_stats);
atomic_set(&chip->wq_processing, 0);
+ mutex_init(&chip->reinit_mutex);
for (reg = 0; reg < 6; reg++)
chip->regmap[reg] = pgm[reg];
@@ -156,7 +157,9 @@
{
if (atomic_inc_return(&chip->wq_processing) == 1)
cancel_delayed_work_sync(&chip->work);
+ mutex_lock(&chip->reinit_mutex);
ak4114_init_regs(chip);
+ mutex_unlock(&chip->reinit_mutex);
/* bring up statistics / event queing */
if (atomic_dec_and_test(&chip->wq_processing))
schedule_delayed_work(&chip->work, HZ / 10);