From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Wed, 9 May 2012 20:45:43 +0000 (+0100)
Subject: drm/i915: Avoid a double-read of PCH_IIR during interrupt handling
X-Git-Tag: v3.2.19~26
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d4599f3bbffe162f91ebeea6c610af549a34348b;p=pandora-kernel.git

drm/i915: Avoid a double-read of PCH_IIR during interrupt handling

commit 9adab8b5a7fde248504f484e197589f3e3c922e2 upstream.

Currently the code re-reads PCH_IIR during the hotplug interrupt
processing. Not only is this a wasted read, but introduces a potential
for handling a spurious interrupt as we then may not clear all the
interrupts processed (since the re-read IIR may contains more interrupts
asserted than we clear using the result of the original read).

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---

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