drm/amdgpu: Use vm status_lock to protect pt free
Use vm_status_lock to protect all vm_status state transitions to allow them to happen without a reservation lock in unlocked page table updates. Signed-off-by: Philip Yang <Philip.Yang@amd.com> Acked-by: Felix Kuehling <Felix.Kuehling@amd.com> Reviewed-by: Christian König <christian.koenig@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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