commit 2b003ee8211d1e78f257dd91a5a24b425d330a1d
Author: Jean-Samuel Chenard <[EMAIL PROTECTED]>
Date: Tue Mar 25 06:35:08 2008 +0000
UIO: add pgprot_noncached() to UIO mmap code
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 <[EMAIL PROTECTED]>
Signed-off-by: Hans J Koch <[EMAIL PROTECTED]>
Signed-off-by: Greg Kroah-Hartman <[EMAIL PROTECTED]>
Signed-off-by: Chris Wright <[EMAIL PROTECTED]>
diff --git a/drivers/uio/uio.c b/drivers/uio/uio.c
index 865f32b..b4e1022 100644
--- a/drivers/uio/uio.c
+++ b/drivers/uio/uio.c
@@ -447,6 +447,8 @@ 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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