From: Takashi Iwai Date: Wed, 11 Oct 2017 09:42:00 +0000 (+0200) Subject: ALSA: pcm: Forcibly stop at disconnect callback X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=6ca73de7ebc5dac358551633e0c69ab6b5007baa;p=openwrt%2Fstaging%2Fblogic.git ALSA: pcm: Forcibly stop at disconnect callback So far we assumed that each driver implements the hotplug PCM handling properly, e.g. dealing with the pending PCM stream at disconnect callback. But most codes don't care, and it eventually leaves the PCM stream inconsistent state when an abrupt disconnection like sysfs unbind happens. This patch is simple but a big-hammer solution: invoke snd_pcm_stop() at the common PCM disconnect callback always when the stream is running. Tested-by: Kuninori Morimoto Signed-off-by: Takashi Iwai --- diff --git a/sound/core/pcm.c b/sound/core/pcm.c index 1b073ed0b1f9..9070f277f8db 100644 --- a/sound/core/pcm.c +++ b/sound/core/pcm.c @@ -1154,6 +1154,10 @@ static int snd_pcm_dev_disconnect(struct snd_device *device) for (substream = pcm->streams[cidx].substream; substream; substream = substream->next) { snd_pcm_stream_lock_irq(substream); if (substream->runtime) { + if (snd_pcm_running(substream)) + snd_pcm_stop(substream, + SNDRV_PCM_STATE_DISCONNECTED); + /* to be sure, set the state unconditionally */ substream->runtime->status->state = SNDRV_PCM_STATE_DISCONNECTED; wake_up(&substream->runtime->sleep); wake_up(&substream->runtime->tsleep);