The addr parameter may not page aligned eg. when it's come from
vfb_mmap():vma->vm_start in video driver.
This patch fix the check in remap_pfn_range() else some driver like v4l2 will
fail in this function while calling mmap() on nommu arch like blackfin and st.
Reported-by: Bhupesh SHARMA <bhupesh.sharma@xxxxxx>
Reported-by: Scott Jiang <scott.jiang.linux@xxxxxxxxx>
Signed-off-by: Bob Liu <lliubbo@xxxxxxxxx>
---
mm/nommu.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mm/nommu.c b/mm/nommu.c
index d4b0c10..5d6068b 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -1819,7 +1819,7 @@ struct page *follow_page(struct vm_area_struct *vma, unsigned long address,
int remap_pfn_range(struct vm_area_struct *vma, unsigned long addr,
unsigned long pfn, unsigned long size, pgprot_t prot)
{
- if (addr != (pfn << PAGE_SHIFT))
+ if ((addr & PAGE_MASK) != (pfn << PAGE_SHIFT))
return -EINVAL;
vma->vm_flags |= VM_IO | VM_RESERVED | VM_PFNMAP;
--
1.7.9.5
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