| Date | Wed, 16 Apr 2008 18:01:28 -0700 | From | Chris Wright <> | Subject | UIO: add pgprot_noncached() to UIO mmap code |
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-stable review patch. If anyone has any objections, please let us know. ---------------------
From: Jean-Samuel Chenard <jsamch@gmail.com>
upstream commit: c9698d6b1a90929e427a165bd8283f803f57d9bd
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> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> Signed-off-by: Chris Wright <chrisw@sous-sol.org> --- drivers/uio/uio.c | 2 ++ 1 file changed, 2 insertions(+)
--- a/drivers/uio/uio.c +++ b/drivers/uio/uio.c @@ -447,6 +447,8 @@ static int uio_mmap_physical(struct vm_a 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, --
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