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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/control.c
parenta0830dbd4e42b38aefdf3fb61ba5019a1a99ea85 (diff)
downloadop-kernel-dev-0914f7961babbf28aaa2f19b453951fb4841c03f.zip
op-kernel-dev-0914f7961babbf28aaa2f19b453951fb4841c03f.tar.gz
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/control.c')
-rw-r--r--sound/core/control.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/sound/core/control.c b/sound/core/control.c
index 9768a39..8c7c2c9 100644
--- a/sound/core/control.c
+++ b/sound/core/control.c
@@ -1437,6 +1437,8 @@ static ssize_t snd_ctl_read(struct file *file, char __user *buffer,
spin_unlock_irq(&ctl->read_lock);
schedule();
remove_wait_queue(&ctl->change_sleep, &wait);
+ if (ctl->card->shutdown)
+ return -ENODEV;
if (signal_pending(current))
return -ERESTARTSYS;
spin_lock_irq(&ctl->read_lock);
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