drm/amdgpu: add spin lock to protect freed list in vm (v2)
there is a protection fault about freed list when OCL test. add a spin lock to protect it. v2: drop changes in vm_fini Signed-off-by: NJimQu <jim.qu@amd.com> Reviewed-by: NChristian König <christian.koenig@amd.com>
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