From: Michel Dänzer <michel.daenzer@amd.com>
Date: Fri, 3 Jul 2015 01:02:27 +0000 (+0900)
Subject: drm/radeon: Don't flush the GART TLB if rdev->gart.ptr == NULL
X-Git-Tag: omap-for-v4.3/fixes-merge-window~233^2~7^2~11
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=233709d2cd6bbaaeda0aeb8d11f6ca7f98563b39;p=pandora-kernel.git

drm/radeon: Don't flush the GART TLB if rdev->gart.ptr == NULL

This can be the case when the GPU is powered off, e.g. via vgaswitcheroo
or runpm. When the GPU is powered up again, radeon_gart_table_vram_pin
flushes the TLB after setting rdev->gart.ptr to non-NULL.

Fixes panic on powering off R7xx GPUs.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=61529
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Michel Dänzer <michel.daenzer@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
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