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| author | Takashi Iwai <tiwai@suse.de> | 2015-01-16 13:03:28 +0100 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2015-01-28 22:30:18 +0100 |
| commit | 1781e78c63317c04e6ae6a076acfd53236f420bc (patch) | |
| tree | b8358b38b7a3eba0da92bbce316d2bcb01e84900 | |
| parent | 1293617cddc40971917150e3f5bf66b7306e2e7e (diff) | |
| download | linux-1781e78c63317c04e6ae6a076acfd53236f420bc.tar.bz2 | |
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>
| -rw-r--r-- | include/sound/ak4113.h | 1 | ||||
| -rw-r--r-- | include/sound/ak4114.h | 1 | ||||
| -rw-r--r-- | sound/i2c/other/ak4113.c | 3 | ||||
| -rw-r--r-- | sound/i2c/other/ak4114.c | 3 |
4 files changed, 8 insertions, 0 deletions
diff --git a/include/sound/ak4113.h b/include/sound/ak4113.h index f4fbf6888e78..58c145620c3c 100644 --- a/include/sound/ak4113.h +++ b/include/sound/ak4113.h @@ -287,6 +287,7 @@ struct ak4113 { 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 e681df2c95e1..b6feb7e225f2 100644 --- a/include/sound/ak4114.h +++ b/include/sound/ak4114.h @@ -169,6 +169,7 @@ struct ak4114 { 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 c2b14d981fa1..88844881cbff 100644 --- a/sound/i2c/other/ak4113.c +++ b/sound/i2c/other/ak4113.c @@ -89,6 +89,7 @@ int snd_ak4113_create(struct snd_card *card, ak4113_read_t *read, 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 @@ void snd_ak4113_reinit(struct ak4113 *chip) { 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 ee639f57b664..5a4cf3fab4ae 100644 --- a/sound/i2c/other/ak4114.c +++ b/sound/i2c/other/ak4114.c @@ -100,6 +100,7 @@ int snd_ak4114_create(struct snd_card *card, 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 @@ void snd_ak4114_reinit(struct ak4114 *chip) { 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); |