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ALSA: pcm: Fix double hw_free calls 

The commit 66f2d19f81 ("ALSA: pcm: Fix memory leak at closing a
stream without hw_free") tried to fix the regression wrt the missing
hw_free call at closing without SNDRV_PCM_IOCTL_HW_FREE ioctl.
However, the code change dropped mistakenly the state check, resulting
in calling hw_free twice when SNDRV_PCM_IOCTL_HW_FRE got called
beforehand.  For most drivers, this is almost harmless, but the
drivers like SOF show another regression now.

This patch adds the state condition check before calling do_hw_free()
at releasing the stream for avoiding the double hw_free calls.

Fixes: 66f2d19f81 ("ALSA: pcm: Fix memory leak at closing a stream without hw_free")
Reported-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Reported-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Tested-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/s5hd0ajyprg.wl-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2020-02-13 07:03:49 +01:00
parent 9f35a31283
commit 0fbb027b44
1 changed files with 2 additions and 1 deletions
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3
sound/core/pcm_native.c
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@ -2594,7 +2594,8 @@ void snd_pcm_release_substream(struct snd_pcm_substream *substream)
snd_pcm_drop(substream); snd_pcm_drop(substream);
if (substream->hw_opened) { if (substream->hw_opened) {
do_hw_free(substream); if (substream->runtime->status->state != SNDRV_PCM_STATE_OPEN)
do_hw_free(substream);
substream->ops->close(substream); substream->ops->close(substream);
substream->hw_opened = 0; substream->hw_opened = 0;
} }