drm/i915: Hold gt_lock during reset
authorKeith Packard <keithp@keithp.com>
Fri, 6 Jan 2012 19:44:11 +0000 (11:44 -0800)
committerKeith Packard <keithp@keithp.com>
Thu, 19 Jan 2012 20:28:42 +0000 (12:28 -0800)
This ensures that no register reads occur while the forcewake state of
the hardware is indeterminate during the reset operation.

Signed-off-by: Keith Packard <keithp@keithp.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>

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