diff options
| author | Liam Girdwood <lrg@ti.com> | 2012-03-07 10:38:25 +0000 |
|---|---|---|
| committer | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2012-04-01 11:28:21 +0100 |
| commit | 01b9d99a1f45befa604543ead29f44fdb0878844 (patch) | |
| tree | e71ae8fc98724700968b18d6756091fb3f54cf3e | |
| parent | 253322c18830965331e54ee33c5e8064a2f15717 (diff) | |
| download | linux-01b9d99a1f45befa604543ead29f44fdb0878844.tar.bz2 | |
ASoC: core: Add card mutex locking subclasses
This is the first part of a change that is intended to improve
ASoC locking protection for DAPM and PCM operations.
This part of the series adds a mutex class for the soc_card mutex. The
SND_SOC_CARD_CLASS_INIT class is used for card initialisation only whilst the
SND_SOC_CARD_CLASS_PCM class is used for the forth coming Dynamic
PCM operations. The new mutex classes are required otherwise we will see a false
positive mutex deadlock warning between the card initialisation and the PCM
operations (something that would never deadlock in real life).
Signed-off-by: Liam Girdwood <lrg@ti.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
| -rw-r--r-- | include/sound/soc.h | 5 | ||||
| -rw-r--r-- | sound/soc/soc-core.c | 2 |
2 files changed, 6 insertions, 1 deletions
diff --git a/include/sound/soc.h b/include/sound/soc.h index 2ebf7877c148..70de2f82e872 100644 --- a/include/sound/soc.h +++ b/include/sound/soc.h @@ -288,6 +288,11 @@ enum snd_soc_pcm_subclass { SND_SOC_PCM_CLASS_BE = 1, }; +enum snd_soc_card_subclass { + SND_SOC_CARD_CLASS_INIT = 0, + SND_SOC_CARD_CLASS_PCM = 1, +}; + int snd_soc_codec_set_sysclk(struct snd_soc_codec *codec, int clk_id, int source, unsigned int freq, int dir); int snd_soc_codec_set_pll(struct snd_soc_codec *codec, int pll_id, int source, diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c index a4deebc0801a..a6da20a72d43 100644 --- a/sound/soc/soc-core.c +++ b/sound/soc/soc-core.c @@ -1416,7 +1416,7 @@ static void snd_soc_instantiate_card(struct snd_soc_card *card) struct snd_soc_dai_link *dai_link; int ret, i, order; - mutex_lock(&card->mutex); + mutex_lock_nested(&card->mutex, SND_SOC_CARD_CLASS_INIT); if (card->instantiated) { mutex_unlock(&card->mutex); |