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: 66c45500bfdc ("drm/amdgpu: use new HMM APIs and helpers")
Fixes: 0919195f2b0d ("drm/amdgpu: Enable amdgpu_ttm_tt_get_user_pages in worker threads")
Link: https://lore.kernel.org/r/[email protected]
Acked-by: Christian König <[email protected]>
Reviewed-by: Felix Kuehling <[email protected]>
Reviewed-by: Philip Yang <[email protected]>
Tested-by: Philip Yang <[email protected]>
Signed-off-by: Jason Gunthorpe <[email protected]>

0 files changed, 0 insertions, 0 deletions