tree 4dc74b708a07b56d12ed72a34d0a2e0cb8c8b9d4
parent 888ea7d5ac6815ba16b3b3a20f665a92c7af6724
author Takashi Iwai <tiwai@suse.de> 1350385559 +0200
committer Takashi Iwai <tiwai@suse.de> 1351591630 +0100

ALSA: Add a reference counter to card instance

For more strict protection for wild disconnections, a refcount is
introduced to the card instance, and let it up/down when an object is
referred via snd_lookup_*() in the open ops.

The free-after-last-close check is also changed to check this refcount
instead of the empty list, too.

Reported-by: Matthieu CASTET <matthieu.castet@parrot.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>