3.10-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Alex Deucher <alexander.deuc...@amd.com>

commit f957063fee6392bb9365370db6db74dc0b2dce0a upstream.

To make sure the writes go through the pci bridge.

bug:
https://bugzilla.kernel.org/show_bug.cgi?id=90741

Signed-off-by: Alex Deucher <alexander.deuc...@amd.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 drivers/gpu/drm/radeon/r100.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/gpu/drm/radeon/r100.c
+++ b/drivers/gpu/drm/radeon/r100.c
@@ -743,6 +743,10 @@ int r100_irq_set(struct radeon_device *r
                tmp |= RADEON_FP2_DETECT_MASK;
        }
        WREG32(RADEON_GEN_INT_CNTL, tmp);
+
+       /* read back to post the write */
+       RREG32(RADEON_GEN_INT_CNTL);
+
        return 0;
 }
 


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