[Intel-gfx] [PATCH] drm/i915: Check for driver readyness before handling an underrun interrupt

[shuang.he at intel.com]

Tested-By: PRC QA PRTS (Patch Regression Test System Contact: shuang.he at intel.com)
Task id: 5842
-------------------------------------Summary-------------------------------------
Platform          Delta          drm-intel-nightly          Series Applied
PNV                                  282/282              282/282
ILK                 -1              308/308              307/308
SNB                 -1              326/326              325/326
IVB                                  379/379              379/379
BYT                                  294/294              294/294
HSW                                  387/387              387/387
BDW                 -1              316/316              315/316
-------------------------------------Detailed-------------------------------------
Platform  Test                                drm-intel-nightly          Series Applied
*ILK  igt_kms_flip_rcs-wf_vblank-vs-dpms-interruptible      PASS(4)      DMESG_WARN(1)PASS(1)
*SNB  igt_kms_plane_plane-panning-bottom-right-pipe-B-plane-1      PASS(3)      TIMEOUT(1)PASS(1)
*BDW  igt_gem_gtt_hog      PASS(15)      DMESG_WARN(1)PASS(1)
Note: You need to pay more attention to line start with '*'