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| author | Keir Fraser <Keir.Fraser@cl.cam.ac.uk> | 2005-09-22 21:43:59 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-09-22 22:17:34 -0700 |
| commit | 609725f87709724218047a1049913ed233f79d3c (patch) | |
| tree | 7ccc4b12808b4de7d248ba7a722637f244155f26 /drivers/char/hpet.c | |
| parent | 7243cc05bafdda4c4de77cba00cf87666bd237f7 (diff) | |
| download | lwn-609725f87709724218047a1049913ed233f79d3c.tar.gz lwn-609725f87709724218047a1049913ed233f79d3c.zip | |
[PATCH] Fix mmap() of /dev/hpet
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@xensource.com>
Cc: Robert Picco <Robert.Picco@hp.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/char/hpet.c')
| -rw-r--r-- | drivers/char/hpet.c | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/drivers/char/hpet.c b/drivers/char/hpet.c index de0379b6d502..c055bb630ffc 100644 --- a/drivers/char/hpet.c +++ b/drivers/char/hpet.c @@ -273,7 +273,6 @@ static int hpet_mmap(struct file *file, struct vm_area_struct *vma) 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)) { |