[PATCH 1/7] HPET: Fix mmap() of /dev/hpet

[Clemens Ladisch]

From: Keir Fraser <keir@xxxxxxxxxxxxx>

The address passed to io_remap_pfn_range() in hpet_mmap() does not
need to be converted using __pa(): it is already a physical
address. This bug was found and the patch suggested by Clay Harris.

I introduced this particular bug when making io_remap_pfn_range
changes a few months ago. In fact mmap()ing /dev/hpet has *never*
previously worked: before my changes __pa() was being executed on an
ioremap()ed virtual address, which is also invalid.

Signed-off-by: Keir Fraser <keir@xxxxxxxxxxxxx>

Index: linux-2.6.13/drivers/char/hpet.c
===================================================================
--- linux-2.6.13.orig/drivers/char/hpet.c	2005-10-03 22:52:30.000000000 +0200
+++ linux-2.6.13/drivers/char/hpet.c	2005-10-03 22:53:09.000000000 +0200
@@ -279,7 +279,6 @@ static int hpet_mmap(struct file *file, 
 
 	vma->vm_flags |= VM_IO;
 	vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
-	addr = __pa(addr);
 
 	if (io_remap_pfn_range(vma, vma->vm_start, addr >> PAGE_SHIFT,
 					PAGE_SIZE, vma->vm_page_prot)) {
-
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