From: Pallipadi, Venkatesh <venkatesh.pallipadi@intel.com>
Date: Mon, 30 Mar 2009 18:50:19 +0000 (+0000)
Subject: x86, PAT, PCI: Change vma prot in pci_mmap to reflect inherited prot
X-Git-Tag: v2.6.27.22~50
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=512378cd937c9b7692b8382cbfe10f6b6504086b;p=pandora-kernel.git

x86, PAT, PCI: Change vma prot in pci_mmap to reflect inherited prot

upstream commit: 9cdec049389ce2c324fd1ec508a71528a27d4a07

While looking at the issue in the thread:

  http://marc.info/?l=dri-devel&m=123606627824556&w=2

noticed a bug in pci PAT code and memory type setting.

PCI mmap code did not set the proper protection in vma, when it
inherited protection in reserve_memtype. This bug only affects
the case where there exists a WC mapping before X does an mmap
with /proc or /sys pci interface. This will cause X userlevel
mmap from /proc or /sysfs to fail on fork.

Reported-by: Kevin Winchester <kjwinchester@gmail.com>
Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
Cc: Dave Airlie <airlied@redhat.com>
Cc: <stable@kernel.org>
LKML-Reference: <20090323190720.GA16831@linux-os.sc.intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

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