drm/amdgpu: Call find_vma under mmap_sem
find_vma() must be called under the mmap_sem, reorganize this code to do the vma check after entering the lock. Further, fix the unlocked use of struct task_struct's mm, instead use the mm from hmm_mirror which has an active mm_grab. Also the mm_grab must be converted to a mm_get before acquiring mmap_sem or calling find_vma(). Fixes: 66c45500 ("drm/amdgpu: use new HMM APIs and helpers") Fixes: 0919195f ("drm/amdgpu: Enable amdgpu_ttm_tt_get_user_pages in worker threads") Link: https://lore.kernel.org/r/20191112202231.3856-11-jgg@ziepe.ca Acked-by:Christian König <christian.koenig@amd.com> Reviewed-by:
Felix Kuehling <Felix.Kuehling@amd.com> Reviewed-by:
Philip Yang <Philip.Yang@amd.com> Tested-by:
Philip Yang <Philip.Yang@amd.com> Signed-off-by:
Jason Gunthorpe <jgg@mellanox.com>
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