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ASoC: soc-compress: lock pcm_mutex to resolve lockdep error 

If panic_on_warn=1 is added in bootargs and compress offload playback with
DPCM is started, kernel panic would be occurred because rtd->card->pcm_mutex
isn't held in soc_compr_open_fe() and soc_compr_free_fe() and it generates
lockdep warning in the following code.

void snd_soc_runtime_action(struct snd_soc_pcm_runtime *rtd,
			    int stream, int action)
{
	struct snd_soc_dai *dai;
	int i;

	lockdep_assert_held(&rtd->card->pcm_mutex);

To prevent lockdep warning but minimize side effect by adding mutex,
pcm_mutex is held just before snd_soc_runtime_activate() and
snd_soc_runtime_deactivate() and is released right after them.

Signed-off-by: Gyeongtaek Lee <gt82.lee@samsung.com>
Link: https://lore.kernel.org/r/1891546521.01617772502282.JavaMail.epsvc@epcpadp3
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Gyeongtaek Lee 2021-04-07 13:14:04 +09:00 committed by Mark Brown
parent 3e075e8428
commit 45475bf60c
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1 changed files with 4 additions and 0 deletions
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4
sound/soc/soc-compress.c
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@ -151,7 +151,9 @@ static int soc_compr_open_fe(struct snd_compr_stream *cstream)
fe->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;
mutex_lock_nested(&fe->card->pcm_mutex, fe->card->pcm_subclass);
snd_soc_runtime_activate(fe, stream);
mutex_unlock(&fe->card->pcm_mutex);
mutex_unlock(&fe->card->mutex);
@ -178,7 +180,9 @@ static int soc_compr_free_fe(struct snd_compr_stream *cstream)
mutex_lock_nested(&fe->card->mutex, SND_SOC_CARD_CLASS_RUNTIME);
mutex_lock_nested(&fe->card->pcm_mutex, fe->card->pcm_subclass);
snd_soc_runtime_deactivate(fe, stream);
mutex_unlock(&fe->card->pcm_mutex);
fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;