From: Christian König <christian.koenig@amd.com>
Date: Wed, 28 Jun 2017 11:50:07 +0000 (+0200)
Subject: drm/amdgpu: fix amdgpu_ring_write_multiple
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=369421cbfabf0650b73571d7d1c026fc3830e74d;p=openwrt%2Fstaging%2Fblogic.git

drm/amdgpu: fix amdgpu_ring_write_multiple

Overwriting still used ring content has a low probability to cause
problems, not writing at all has 100% probability to cause problems.

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Felix Kuehling <Felix.Kuehling@amd.com>
---

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h
index 04cbc3a4d4bf..322d25299a00 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h
@@ -227,10 +227,8 @@ static inline void amdgpu_ring_write_multiple(struct amdgpu_ring *ring,
 	unsigned occupied, chunk1, chunk2;
 	void *dst;
 
-	if (unlikely(ring->count_dw < count_dw)) {
+	if (unlikely(ring->count_dw < count_dw))
 		DRM_ERROR("amdgpu: writing more dwords to the ring than expected!\n");
-		return;
-	}
 
 	occupied = ring->wptr & ring->buf_mask;
 	dst = (void *)&ring->ring[occupied];