From 11bab0ae9991b165b542294806013d1e06fb3294 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Michel=20D=C3=A4nzer?= <michel.daenzer@amd.com>
Date: Fri, 19 Sep 2014 12:07:11 +0900
Subject: [PATCH] drm/radeon: Clear RB_OVERFLOW bit earlier
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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: Michel Dänzer <michel.daenzer@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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