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Commit e445ee65 authored by David S. Miller's avatar David S. Miller
Browse files

[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: default avatarDavid S. Miller <davem@davemloft.net>
parent 597d1f06

drivers/video/sbuslib.c

+3 −0
Original line number Original line Diff line number Diff line
@@ -46,6 +46,9 @@ int sbusfb_mmap_helper(struct sbus_mmap_map *map, 
	unsigned long off;

	unsigned long off;

	int i;

	int i;

                                        

                                        

	if (!(vma->vm_flags & (VM_SHARED | VM_MAYSHARE)))

		return -EINVAL;



	size = vma->vm_end - vma->vm_start;

	size = vma->vm_end - vma->vm_start;

	if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))

	if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))

		return -EINVAL;

		return -EINVAL;