Commit c9698d6b authored Mar 14, 2008 by Jean-Samuel Chenard Committed by Greg Kroah-Hartman Mar 24, 2008

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>

parent 7c12c92f

drivers/uio/uio.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -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,