Commit c9698d6b authored by Jean-Samuel Chenard's avatar Jean-Samuel Chenard Committed by Greg Kroah-Hartman

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: default avatarJean-Samuel Chenard <jsamch@gmail.com>
Signed-off-by: default avatarHans J Koch <hjk@linutronix.de>
Cc: stable <stable@kernel.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 7c12c92f
......@@ -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,
......
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