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Don't map or unmap svm range to gpu if vm is not ready for updates. Why: DRM entity may already be killed when the svm worker try to update gpu vm. Signed-off-by: YuanShang <YuanShang.Mao@amd.com> Reviewed-by: Philip Yang <philip.yang@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> (cherry picked from commit 55f8e366c326980174a4f2b9501b524d8eb25135)