Mutex is doubly unlocked in some error path of pcm.open. This commit fixes
ALSA firewire-motu driver in Linux kernel v5.5.
Reported-by: kbuild test robot <lkp@xxxxxxxxx>
Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Fixes: 3fd80b200388 ("ALSA: firewire-motu: use the same size of period for PCM substream in AMDTP streams")
Fixes: 0f5482e7875b ("ALSA: firewire-motu: share PCM buffer size for both direction")
Signed-off-by: Takashi Sakamoto <o-takashi@xxxxxxxxxxxxx>
---
sound/firewire/motu/motu-pcm.c | 8 ++------
1 file changed, 2 insertions(+), 6 deletions(-)
diff --git a/sound/firewire/motu/motu-pcm.c b/sound/firewire/motu/motu-pcm.c
index 349b4d09e84f..005970931030 100644
--- a/sound/firewire/motu/motu-pcm.c
+++ b/sound/firewire/motu/motu-pcm.c
@@ -177,18 +177,14 @@ static int pcm_open(struct snd_pcm_substream *substream)
err = snd_pcm_hw_constraint_minmax(substream->runtime,
SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
frames_per_period, frames_per_period);
- if (err < 0) {
- mutex_unlock(&motu->mutex);
+ if (err < 0)
goto err_locked;
- }
err = snd_pcm_hw_constraint_minmax(substream->runtime,
SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
frames_per_buffer, frames_per_buffer);
- if (err < 0) {
- mutex_unlock(&motu->mutex);
+ if (err < 0)
goto err_locked;
- }
}
}
--
2.20.1
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