diff options
| author | Pallipadi, Venkatesh | 2009-03-23 12:07:20 -0700 |
|---|---|---|
| committer | Ingo Molnar | 2009-03-24 10:42:35 +0100 |
| commit | 9cdec049389ce2c324fd1ec508a71528a27d4a07 (patch) | |
| tree | 835f702631f2daeda8742c2784ee25018039d313 /arch/x86/pci | |
| parent | 7f00a2495bf5b98b097c47be5d6e2d4114ec39bf (diff) | |
x86, PAT, PCI: Change vma prot in pci_mmap to reflect inherited prot
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>
Diffstat (limited to 'arch/x86/pci')
| -rw-r--r-- | arch/x86/pci/i386.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/x86/pci/i386.c b/arch/x86/pci/i386.c index 5ead808dd70c..f234a37bd428 100644 --- a/arch/x86/pci/i386.c +++ b/arch/x86/pci/i386.c @@ -319,6 +319,9 @@ int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma, return -EINVAL; } flags = new_flags; + vma->vm_page_prot = __pgprot( + (pgprot_val(vma->vm_page_prot) & ~_PAGE_CACHE_MASK) | + flags); } if (((vma->vm_pgoff < max_low_pfn_mapped) || |