From: Takashi Iwai <tiwai@suse.de>
Date: Tue, 16 Oct 2012 11:05:59 +0000 (+0200)
Subject: ALSA: Add a reference counter to card instance
X-Git-Tag: v3.2.34~72
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3b4a36722e5e518e4bdd3a215d8a1c5adc18e911;p=pandora-kernel.git

ALSA: Add a reference counter to card instance

commit a0830dbd4e42b38aefdf3fb61ba5019a1a99ea85 upstream.

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>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---

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