drm/i915/ringbuffer: Simplify the ring irq refcounting
authorChris Wilson <chris@chris-wilson.co.uk>
Tue, 4 Jan 2011 22:22:56 +0000 (22:22 +0000)
committerChris Wilson <chris@chris-wilson.co.uk>
Tue, 11 Jan 2011 20:43:57 +0000 (20:43 +0000)
... and move it under the spinlock to gain the appropriate memory
barriers.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=32752
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

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