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[VIDEO] sbuslib: Disallow private mmaps.

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The COW semantics just do not make any sense especially
with the physically discontiguous I/O mappings possible
here.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2005-12-24 12:06:10 -08:00
parent 597d1f0622
commit e445ee65cb
1 changed files with 3 additions and 0 deletions
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drivers/video/sbuslib.c
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@ -46,6 +46,9 @@ int sbusfb_mmap_helper(struct sbus_mmap_map *map,
unsigned long off;
int i;
if (!(vma->vm_flags & (VM_SHARED | VM_MAYSHARE)))
return -EINVAL;
size = vma->vm_end - vma->vm_start;
if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
return -EINVAL;