[Intel-gfx] [PATCH] drm: Fixes unsafe deference in locks.

[shuang.he at intel.com]

Tested-By: PRC QA PRTS (Patch Regression Test System Contact: shuang.he at intel.com)
Task id: 6100
-------------------------------------Summary-------------------------------------
Platform          Delta          drm-intel-nightly          Series Applied
PNV                                  276/276              276/276
ILK                                  303/303              303/303
SNB                 -1              304/304              303/304
IVB                                  338/338              338/338
BYT                                  287/287              287/287
HSW                 -1              361/361              360/361
BDW                                  309/309              309/309
-------------------------------------Detailed-------------------------------------
Platform  Test                                drm-intel-nightly          Series Applied
*SNB  igt at kms_rotation_crc@sprite-rotation      PASS(2)      FAIL(1)PASS(1)
*HSW  igt at pm_rpm@drm-resources-equal      PASS(4)      DMESG_WARN(1)PASS(1)
(dmesg patch applied)WARNING:at_drivers/gpu/drm/i915/intel_uncore.c:#assert_device_not_suspended[i915]()@WARNING:.* at .* assert_device_not_suspended+0x
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