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drm/amdkfd: fix UAF race in destroy_queue_cpsch
wait_on_destroy_queue() drops locks to wait for queue resume, allowing a concurrent destroy to free the queue. Use is_being_destroyed flag to serialize destruction. Reviewed-by: Amir Shetaia <Amir.Shetaia@amd.com> Signed-off-by: Alysa Liu <Alysa.Liu@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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