[VIDEO] sbuslib: Disallow private mmaps.

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

View file

@ -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;