[Intel-gfx] [PATCH] drm/i915: use in_interrupt() not in_irq() to check context

[shuang.he at intel.com]

Tested-By: PRC QA PRTS (Patch Regression Test System Contact: shuang.he at intel.com)
Task id: 5907
-------------------------------------Summary-------------------------------------
Platform          Delta          drm-intel-nightly          Series Applied
PNV                 -4              275/275              271/275
ILK                                  307/307              307/307
SNB                 -1              284/284              283/284
IVB                                  375/375              375/375
BYT                                  294/294              294/294
HSW                 -1              385/385              384/385
BDW                 -1              314/314              313/314
-------------------------------------Detailed-------------------------------------
Platform  Test                                drm-intel-nightly          Series Applied
*PNV  igt_gem_fence_thrash_bo-write-verify-none      PASS(3)      FAIL(1)PASS(1)
*PNV  igt_gem_fence_thrash_bo-write-verify-x      PASS(3)      FAIL(1)PASS(1)
*PNV  igt_gem_fence_thrash_bo-write-verify-y      PASS(3)      FAIL(1)PASS(1)
 PNV  igt_gen3_render_tiledx_blits      FAIL(1)PASS(5)      FAIL(1)PASS(1)
*SNB  igt_gem_fence_thrash_bo-write-verify-none      PASS(2)      DMESG_WARN(1)PASS(1)
*HSW  igt_pm_rpm_reg-read-ioctl      PASS(2)      DMESG_FAIL(1)PASS(1)
*BDW  igt_gem_gtt_hog      PASS(4)      DMESG_WARN(1)PASS(1)
Note: You need to pay more attention to line start with '*'