drm/radeon: fix a bug with the ring syncing code
Rings need to lock in order, otherwise the ring subsystem can deadlock. v2: fix error handling and number of locked doublewords. v3: stop creating unneeded semaphores. Signed-off-by: NChristian König <deathsimple@vodafone.de> Reviewed-by: NJerome Glisse <jglisse@redhat.com> Signed-off-by: NDave Airlie <airlied@redhat.com>
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