From: Christian Koenig <christian.koenig@amd.com>
Date: Wed, 16 May 2012 19:45:24 +0000 (+0200)
Subject: drm/radeon: fix & improve ih ring handling v3
X-Git-Tag: v3.6-rc1~83^2~44^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c20dc3698dc7ecf053e2bf77299ae5982c0c2c45;p=pandora-kernel.git

drm/radeon: fix & improve ih ring handling v3

The spinlock was actually there to protect the
rptr, but rptr was read outside of the locked area.

Also we don't really need a spinlock here, an
atomic should to quite fine since we only need to
prevent it from being reentrant.

v2: Keep the spinlock....
v3: Back to an atomic again after finding & fixing the real bug.

Signed-off-by: Christian Koenig <christian.koenig@amd.com>
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