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authorJean-Samuel Chenard <jsamch@gmail.com>2008-03-14 11:28:36 +0100
committerGreg Kroah-Hartman <gregkh@suse.de>2008-03-24 22:33:49 -0700
commitc9698d6b1a90929e427a165bd8283f803f57d9bd (patch)
treed73c313d4fb05014ce5cf593c97d0ee44cdc5cd3 /drivers/uio
parent7c12c92fba4bd985ed6d909e5537468b268dcaa4 (diff)
UIO: add pgprot_noncached() to UIO mmap code
Mapping of physical memory in UIO needs pgprot_noncached() to ensure that IO memory is not cached. Without pgprot_noncached(), it (accidentally) works on x86 and arm, but fails on PPC. Signed-off-by: Jean-Samuel Chenard <jsamch@gmail.com> Signed-off-by: Hans J Koch <hjk@linutronix.de> Cc: stable <stable@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/uio')
-rw-r--r--drivers/uio/uio.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/uio/uio.c b/drivers/uio/uio.c
index e8a01f26454..11759080ca5 100644
--- a/drivers/uio/uio.c
+++ b/drivers/uio/uio.c
@@ -470,6 +470,8 @@ static int uio_mmap_physical(struct vm_area_struct *vma)
vma->vm_flags |= VM_IO | VM_RESERVED;
+ vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
+
return remap_pfn_range(vma,
vma->vm_start,
idev->info->mem[mi].addr >> PAGE_SHIFT,