From 9d1393f23d5656cdd5f368efd60694d4aeed81d3 Mon Sep 17 00:00:00 2001
From: Alex Deucher <alexander.deucher@amd.com>
Date: Mon, 2 Mar 2015 20:41:31 -0500
Subject: [PATCH] drm/radeon: do a posting read in r600_set_irq

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.deucher@amd.com>
Cc: stable@vger.kernel.org
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