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authorTakashi Iwai <tiwai@suse.de>2012-10-16 13:05:59 +0200
committerTakashi Iwai <tiwai@suse.de>2012-10-30 11:07:10 +0100
commita0830dbd4e42b38aefdf3fb61ba5019a1a99ea85 (patch)
tree4dc74b708a07b56d12ed72a34d0a2e0cb8c8b9d4 /include/sound/ad1843.h
parent888ea7d5ac6815ba16b3b3a20f665a92c7af6724 (diff)
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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>
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