[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>
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@ -46,6 +46,9 @@ int sbusfb_mmap_helper(struct sbus_mmap_map *map,
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unsigned long off;
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int i;
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if (!(vma->vm_flags & (VM_SHARED | VM_MAYSHARE)))
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return -EINVAL;
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size = vma->vm_end - vma->vm_start;
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if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
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return -EINVAL;
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