[Intel-gfx] [PATCH] drm/i915: Take runtime pm reference on hangcheck_info

[shuang.he at intel.com]

Tested-By: PRC QA PRTS (Patch Regression Test System Contact: shuang.he at intel.com)
Task id: 5715
-------------------------------------Summary-------------------------------------
Platform          Delta          drm-intel-nightly          Series Applied
PNV                 -6              282/283              276/283
ILK              +1                 316/319              317/319
SNB                                  322/346              322/346
IVB                 -2              382/384              380/384
BYT                                  296/296              296/296
HSW              +1-2              425/428              424/428
BDW                                  318/333              318/333
-------------------------------------Detailed-------------------------------------
Platform  Test                                drm-intel-nightly          Series Applied
 PNV  igt_gem_userptr_blits_coherency-sync      CRASH(1, M7)PASS(1, M23)      CRASH(1, M7)
 PNV  igt_gem_userptr_blits_coherency-unsync      CRASH(1, M7)PASS(1, M23)      CRASH(1, M7)
 PNV  igt_gen3_render_linear_blits      FAIL(1, M7)CRASH(1, M23)PASS(3, M25M23)      FAIL(1, M7)
 PNV  igt_gen3_render_mixed_blits      FAIL(1, M7)PASS(1, M23)      FAIL(1, M7)
 PNV  igt_gen3_render_tiledx_blits      FAIL(1, M7)PASS(1, M23)      FAIL(1, M7)
 PNV  igt_gen3_render_tiledy_blits      FAIL(1, M7)PASS(1, M23)      FAIL(1, M7)
*PNV  igt_gem_fence_thrash_bo-write-verify-threaded-none      PASS(2, M23M7)      CRASH(1, M7)
*ILK  igt_drv_suspend_forcewake      DMESG_WARN(2, M26)      PASS(1, M26)
*IVB  igt_gem_pwrite_pread_display-copy-performance      PASS(2, M21M4)      DMESG_WARN(1, M4)
 IVB  igt_gem_storedw_batches_loop_secure-dispatch      DMESG_WARN(1, M34)PASS(4, M21M34M4)      DMESG_WARN(1, M4)
 HSW  igt_gem_storedw_loop_blt      DMESG_WARN(1, M20)PASS(1, M20)      DMESG_WARN(1, M20)
 HSW  igt_gem_storedw_loop_vebox      DMESG_WARN(1, M20)PASS(1, M20)      DMESG_WARN(1, M20)
*HSW  igt_pm_rpm_debugfs-read      DMESG_WARN(2, M20)      PASS(1, M20)
Note: You need to pay more attention to line start with '*'