ALSA: Avoid endless sleep after disconnect

When disconnect callback is called, each component should wake up
sleepers and check card->shutdown flag for avoiding the endless sleep
blocking the proper resource release.

Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 8 insertions, 0 deletions

diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c
index 48c6a70ad69e..6e8872de5ba0 100644
--- a/sound/core/pcm_native.c
+++ b/sound/core/pcm_native.c
@@ -1518,6 +1518,10 @@ static int snd_pcm_drain(struct snd_pcm_substream *substream,
                 down_read(&snd_pcm_link_rwsem);
                 snd_pcm_stream_lock_irq(substream);
                 remove_wait_queue(&to_check->sleep, &wait);
+                if (card->shutdown) {
+                        result = -ENODEV;
+                        break;
+                }
                 if (tout == 0) {
                         if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
                                 result = -ESTRPIPE;
@@ -2169,6 +2173,10 @@ static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
                 mutex_unlock(&pcm->open_mutex);
                 schedule();
                 mutex_lock(&pcm->open_mutex);
+                if (pcm->card->shutdown) {
+                        err = -ENODEV;
+                        break;
+                }
                 if (signal_pending(current)) {
                         err = -ERESTARTSYS;
                         break;