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UIO: add pgprot_noncached() to UIO mmap code

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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 <[email protected]>
Signed-off-by: Hans J Koch <[email protected]>
Cc: stable <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Jean-Samuel Chenard 2008-03-14 11:28:36 +01:00 • committed by Greg Kroah-Hartman
commit c9698d6b1a
1 changed files with 2 additions and 0 deletions
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2
drivers/uio/uio.c
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@ -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,