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authorTakashi Iwai <tiwai@suse.de>2012-10-16 16:43:39 +0200
committerTakashi Iwai <tiwai@suse.de>2012-10-30 11:07:15 +0100
commit0914f7961babbf28aaa2f19b453951fb4841c03f (patch)
treefe5c14256a1d7b2116341300dd1e8ed94ac5f576 /sound/core/hwdep.c
parenta0830dbd4e42b38aefdf3fb61ba5019a1a99ea85 (diff)
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>
Diffstat (limited to 'sound/core/hwdep.c')
-rw-r--r--sound/core/hwdep.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/sound/core/hwdep.c b/sound/core/hwdep.c
index 53a6ba5ad615..3f7f6628cf7b 100644
--- a/sound/core/hwdep.c
+++ b/sound/core/hwdep.c
@@ -131,6 +131,10 @@ static int snd_hwdep_open(struct inode *inode, struct file * file)
mutex_unlock(&hw->open_mutex);
schedule();
mutex_lock(&hw->open_mutex);
+ if (hw->card->shutdown) {
+ err = -ENODEV;
+ break;
+ }
if (signal_pending(current)) {
err = -ERESTARTSYS;
break;
@@ -462,12 +466,15 @@ static int snd_hwdep_dev_disconnect(struct snd_device *device)
mutex_unlock(&register_mutex);
return -EINVAL;
}
+ mutex_lock(&hwdep->open_mutex);
+ wake_up(&hwdep->open_wait);
#ifdef CONFIG_SND_OSSEMUL
if (hwdep->ossreg)
snd_unregister_oss_device(hwdep->oss_type, hwdep->card, hwdep->device);
#endif
snd_unregister_device(SNDRV_DEVICE_TYPE_HWDEP, hwdep->card, hwdep->device);
list_del_init(&hwdep->list);
+ mutex_unlock(&hwdep->open_mutex);
mutex_unlock(&register_mutex);
return 0;
}