From: Muli Ben-Yehuda <muli@il.ibm.com>
Date: Tue, 17 Jul 2007 11:05:15 +0000 (-0700)
Subject: OSS trident: fix locking around write_voice_regs
X-Git-Tag: v2.6.23-rc1~616
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3b20b9b4e985fcc48b4eea401cb289a856422c93;p=pandora-kernel.git

OSS trident: fix locking around write_voice_regs

trident_write_voice_regs() was getting called with the card spinlock held in
only some cases.  Fix it.

Explanation: we allocate a new virtual channel in open, and then we frob some
hardware registers (in write_voice_regs) for that channel.  But the hardware
registers are shared with other channels, which may be trying to frob the some
registers (albeit for another channel) via ioctl(SNDCTL_DSP_SPEED).

Fixed bugzilla.kernel.org bug #8172 (http://bugme.osdl.org/show_bug.cgi?id=8172)

Signed-off-by: Muli Ben-Yehuda <muli@il.ibm.com>
Cc: <tammy000@gmail.com>
Cc: <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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