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| author |   Koro Chen <koro.chen@mediatek.com> | 2015-10-28 10:15:34 +0800 |
|---|---|---|
| committer |   Mark Brown <broonie@kernel.org> | 2015-11-16 10:04:04 +0000 |
| commit | 95f444dc9371a3910179a9621c8b94f0f60f5f04 (patch) | |
| tree | 0b3b8157de28945330ac5f66cc381b221dcbe956 /sound/soc/soc-pcm.c | |
| parent | Linux 4.4-rc1 (diff) | |
| download | wireguard-linux-95f444dc9371a3910179a9621c8b94f0f60f5f04.tar.xz wireguard-linux-95f444dc9371a3910179a9621c8b94f0f60f5f04.zip | |
ASoC: dpcm: Make BE prepare possible in suspend state
During suspend/resume, there is a flow that if a driver does not support
SNDRV_PCM_INFO_RESUME, it will fail at snd_pcm_resume(), and user space
can then issue SNDRV_PCM_IOCTL_PREPARE to let audio continue to play.
However, in dpcm_be_dai_prepare() it only allows BEs to be prepared
in state SND_SOC_DPCM_STATE_HW_PARAMS or SND_SOC_DPCM_STATE_STOP.
The BE state will then stay in SND_SOC_DPCM_STATE_SUSPEND, consequently
dpcm_be_dai_shutdown() is skipped in the end of playback and
be_substream->runtime is not cleared while this runtime is actually freed
by snd_pcm_detach_substream(). If another suspend comes, a NULL pointer
dereference will happen in snd_pcm_suspend() when accessing
BE substream's runtime.
Signed-off-by: Koro Chen <koro.chen@mediatek.com>
Acked-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'sound/soc/soc-pcm.c')
| -rw-r--r-- | sound/soc/soc-pcm.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/sound/soc/soc-pcm.c b/sound/soc/soc-pcm.c index c86dc96e8986..c48232211c56 100644 --- a/sound/soc/soc-pcm.c +++ b/sound/soc/soc-pcm.c @@ -2115,7 +2115,8 @@ int dpcm_be_dai_prepare(struct snd_soc_pcm_runtime *fe, int stream) continue; if ((be->dpcm[stream].state != SND_SOC_DPCM_STATE_HW_PARAMS) && - (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP)) + (be->dpcm[stream].state != SND_SOC_DPCM_STATE_STOP) && + (be->dpcm[stream].state != SND_SOC_DPCM_STATE_SUSPEND)) continue; dev_dbg(be->dev, "ASoC: prepare BE %s\n", |