[Intel-gfx] [PATCH] drm: Fix deadlock due to getconnector locking changes

[shuang.he at intel.com]

Tested-By: PRC QA PRTS (Patch Regression Test System Contact: shuang.he at intel.com)
Task id: 5803
-------------------------------------Summary-------------------------------------
Platform          Delta          drm-intel-nightly          Series Applied
PNV                 -5              277/277              272/277
ILK                                  313/313              313/313
SNB                                  309/309              309/309
IVB                                  382/382              382/382
BYT                                  296/296              296/296
HSW                                  425/425              425/425
BDW                 -1              318/318              317/318
-------------------------------------Detailed-------------------------------------
Platform  Test                                drm-intel-nightly          Series Applied
 PNV  igt_gem_userptr_blits_coherency-sync      NO_RESULT(1)CRASH(7)NRUN(1)PASS(6)      CRASH(2)
 PNV  igt_gem_userptr_blits_coherency-unsync      CRASH(5)NRUN(1)PASS(4)      CRASH(1)NRUN(1)
*PNV  igt_gem_userptr_blits_create-destroy-sync      PASS(4)      NRUN(1)PASS(1)
*PNV  igt_gem_userptr_blits_dmabuf-sync      PASS(3)      NRUN(1)PASS(1)
*PNV  igt_gem_userptr_blits_forked-sync-interruptible      PASS(3)      NRUN(1)PASS(1)
*BDW  igt_gem_gtt_hog      PASS(20)      DMESG_WARN(1)PASS(1)
Note: You need to pay more attention to line start with '*'