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When a user unmaps a userq VA, the driver must ensure the queue has no in-flight jobs. If there is pending work, the kernel should wait for the attached eviction (bookkeeping) fence to signal before deleting the mapping. Suggested-by: Christian König <christian.koenig@amd.com> Signed-off-by: Prike Liang <Prike.Liang@amd.com> Reviewed-by: Alex Deucher <alexander.deucher@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>