From: Alex Deucher <alexander.deucher@amd.com>
Date: Thu, 1 Sep 2011 17:46:15 +0000 (+0000)
Subject: drm/radeon/kms: make sure pci max read request size is valid on evergreen+ (v2)
X-Git-Tag: v3.1-rc5~1^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d054ac16eeb658bccadb06b12c39cee22243b10f;p=pandora-kernel.git

drm/radeon/kms: make sure pci max read request size is valid on evergreen+ (v2)

If the bios or OS sets the pci max read request size to 0 or an
invalid value (6,7), it can result in a hang or slowdown.  Check
and set it to something sane if it's invalid.

Fixes:
https://bugzilla.kernel.org/show_bug.cgi?id=42162

v2: use pci reg defines from include/linux/pci_regs.h

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@kernel.org
Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
---

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