[Intel-gfx] [PATCH] drm/i915: avoid leaking DMA mappings

[shuang.he at intel.com]

Tested-By: Intel Graphics QA PRTS (Patch Regression Test System Contact: shuang.he at intel.com)
Task id: 6732
-------------------------------------Summary-------------------------------------
Platform          Delta          drm-intel-nightly          Series Applied
ILK                 -4              302/302              298/302
SNB                 -4              312/316              308/316
IVB                 -5              345/345              340/345
BYT                 -1              289/289              288/289
HSW                 -5              382/382              377/382
-------------------------------------Detailed-------------------------------------
Platform  Test                                drm-intel-nightly          Series Applied
*ILK  igt at gem_userptr_blits@dmabuf-sync      PASS(1)      FAIL(1)
*ILK  igt at gem_userptr_blits@dmabuf-unsync      PASS(1)      FAIL(1)
*ILK  igt at gem_userptr_blits@forked-access      PASS(1)      FAIL(1)
*ILK  igt at gem_userptr_blits@forked-sync-interruptible      PASS(1)      DMESG_WARN(1)
(dmesg patch applied)WARNING:at_drivers/gpu/drm/i915/i915_gem_userptr.c:#cancel_userptr[i915]()@WARNING:.* at .* cancel_userptr+0x
*SNB  igt at gem_userptr_blits@coherency-sync      PASS(1)      CRASH(1)
*SNB  igt at gem_userptr_blits@dmabuf-sync      PASS(1)      FAIL(1)
*SNB  igt at gem_userptr_blits@dmabuf-unsync      PASS(1)      FAIL(1)
*SNB  igt at gem_userptr_blits@forked-access      PASS(1)      FAIL(1)
*IVB  igt at gem_userptr_blits@coherency-sync      PASS(1)      CRASH(1)
*IVB  igt at gem_userptr_blits@coherency-unsync      PASS(1)      CRASH(1)
*IVB  igt at gem_userptr_blits@dmabuf-sync      PASS(1)      FAIL(1)
*IVB  igt at gem_userptr_blits@dmabuf-unsync      PASS(1)      FAIL(1)
*IVB  igt at gem_userptr_blits@forked-access      PASS(1)      FAIL(1)
*BYT  igt at gem_userptr_blits@forked-access      PASS(1)      FAIL(1)
*HSW  igt at gem_userptr_blits@coherency-sync      PASS(1)      FAIL(1)
*HSW  igt at gem_userptr_blits@coherency-unsync      PASS(1)      FAIL(1)
*HSW  igt at gem_userptr_blits@dmabuf-sync      PASS(1)      FAIL(1)
*HSW  igt at gem_userptr_blits@dmabuf-unsync      PASS(1)      FAIL(1)
*HSW  igt at gem_userptr_blits@forked-access      PASS(1)      FAIL(1)
Note: You need to pay more attention to line start with '*'