drm/radeon: do a posting read in r600_set_irq
authorAlex Deucher <alexander.deucher@amd.com>
Tue, 3 Mar 2015 01:41:31 +0000 (20:41 -0500)
committerAlex Deucher <alexander.deucher@amd.com>
Tue, 3 Mar 2015 22:28:27 +0000 (17:28 -0500)
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
drivers/gpu/drm/radeon/r600.c

Simple merge