From: Keith Packard <keithp@keithp.com>
Date: Thu, 16 Oct 2008 18:31:38 +0000 (-0700)
Subject: i915: Protect vblank IRQ reg access with spinlock
X-Git-Tag: v2.6.28-rc1~28^2~11
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e9d21d7f5ae1e625f3687d88bb50b00478c533ad;p=pandora-kernel.git

i915: Protect vblank IRQ reg access with spinlock

This uses the same spinlock as the user_irq code as it shares the same
register, ensuring that interrupt registers are updated atomically.

Signed-off-by: Keith Packard <keithp@keithp.com>
Signed-off-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Dave Airlie <airlied@redhat.com>
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