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Not all asics have all rings, so make sure the ring is ready before attempting to check it in the dynpm work handler. Fixes: https://bugzilla.kernel.org/show_bug.cgi?id=43367 Signed-off-by: Alex Deucher <alexander.deucher@amd.com> Reviewed-by: Jerome Glisse <jglisse@redhat.com> Reviewed-by: Christian König <christian.koenig@amd.com> Signed-off-by: Dave Airlie <airlied@redhat.com>