drm/radeon: Clear RB_OVERFLOW bit earlier
Otherwise the bit remains set in rdev->ih.rptr, so the wptr can never match that and we still have an infinite loop. This fix allows me to successfully recover from an IH ring buffer overflow. Signed-off-by: NMichel Dänzer <michel.daenzer@amd.com> Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>
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