From: Daniel Vetter <daniel.vetter@ffwll.ch>
Date: Thu, 18 Jun 2015 08:30:21 +0000 (+0200)
Subject: drm/i915: Filter out no-op frontbuffer tracking flushes
X-Git-Tag: omap-for-v4.3/fixes-rc1~89^2~36^2~176
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=27e78a2a1f92e79707b4fb18cff1276088ef9178;p=pandora-kernel.git

drm/i915: Filter out no-op frontbuffer tracking flushes

Paulo noticed that the fbc frontbuffer tracking flush callback
occasionally gets a call without any bit set. This can happen when we
have to filter flush calls due to e.g. gpu rendering. Filter these
out.

Reported-by: Paulo Zanoni <przanoni@gmail.com>
Cc: Paulo Zanoni <przanoni@gmail.com>
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
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