From: Yufeng Shen <miletus@chromium.org>
Date: Mon, 13 Feb 2012 22:36:54 +0000 (-0500)
Subject: drm/i915: Fix race condition in accessing GMBUS
X-Git-Tag: v3.4-rc1~143^2~85^2~7
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8a8ed1f5143b3df312e436ab15290e4a7ca6a559;p=pandora-kernel.git

drm/i915: Fix race condition in accessing GMBUS

GMBUS has several ports and each has it's own corresponding
I2C adpater. When multiple I2C adapters call gmbus_xfer() at
the same time there is a race condition in using the underlying
GMBUS controller. Fixing this by adding a mutex lock when calling
gmbus_xfer().

v2: Moved gmbus_mutex below intel_gmbus and added comments.
Rebased to drm-intel-next-queued.

Signed-off-by: Yufeng Shen <miletus@chromium.org>
[danvet: Shortened the gmbus_mutex comment a bit and add the patch
revision comment to the commit message.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---

Reading git-diff-tree failed