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authorTakashi Iwai <tiwai@suse.de>2012-10-15 12:16:02 +0200
committerTakashi Iwai <tiwai@suse.de>2012-10-30 11:07:00 +0100
commit34f3c89fda4fba9fe689db22253ca8db2f5e6386 (patch)
tree213e1b6e6ceaee42dc4f9ec74307794dc7a83b20 /sound/usb/pcm.c
parent978520b75f0a1ce82b17e1e8186417250de6d545 (diff)
ALSA: usb-audio: Use rwsem for disconnect protection
Replace mutex with rwsem for codec->shutdown protection so that concurrent accesses are allowed. Also add the protection to snd_usb_autosuspend() and snd_usb_autoresume(), too. Reported-by: Matthieu CASTET <matthieu.castet@parrot.com> Cc: <stable@vger.kernel.org> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/usb/pcm.c')
-rw-r--r--sound/usb/pcm.c12
1 files changed, 6 insertions, 6 deletions
diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c
index 55e741c5f23..37428f74dbb 100644
--- a/sound/usb/pcm.c
+++ b/sound/usb/pcm.c
@@ -503,12 +503,12 @@ static int snd_usb_hw_params(struct snd_pcm_substream *substream,
return -EINVAL;
}
- mutex_lock(&subs->stream->chip->shutdown_mutex);
+ down_read(&subs->stream->chip->shutdown_rwsem);
if (subs->stream->chip->shutdown)
ret = -ENODEV;
else
ret = set_format(subs, fmt);
- mutex_unlock(&subs->stream->chip->shutdown_mutex);
+ up_read(&subs->stream->chip->shutdown_rwsem);
if (ret < 0)
return ret;
@@ -531,12 +531,12 @@ static int snd_usb_hw_free(struct snd_pcm_substream *substream)
subs->cur_audiofmt = NULL;
subs->cur_rate = 0;
subs->period_bytes = 0;
- mutex_lock(&subs->stream->chip->shutdown_mutex);
+ down_read(&subs->stream->chip->shutdown_rwsem);
if (!subs->stream->chip->shutdown) {
stop_endpoints(subs, 0, 1, 1);
deactivate_endpoints(subs);
}
- mutex_unlock(&subs->stream->chip->shutdown_mutex);
+ up_read(&subs->stream->chip->shutdown_rwsem);
return snd_pcm_lib_free_vmalloc_buffer(substream);
}
@@ -558,7 +558,7 @@ static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
return -ENXIO;
}
- mutex_lock(&subs->stream->chip->shutdown_mutex);
+ down_read(&subs->stream->chip->shutdown_rwsem);
if (subs->stream->chip->shutdown) {
ret = -ENODEV;
goto unlock;
@@ -608,7 +608,7 @@ static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
ret = start_endpoints(subs, 1);
unlock:
- mutex_unlock(&subs->stream->chip->shutdown_mutex);
+ up_read(&subs->stream->chip->shutdown_rwsem);
return ret;
}