drbd: merge_bvec_fn: properly remap bvm->bi_bdev

[pandora-kernel.git] / drivers / uio / uio.c

diff --git a/drivers/uio/uio.c b/drivers/uio/uio.c
index a783d53..af57648 100644 (file)
--- a/drivers/uio/uio.c
+++ b/drivers/uio/uio.c
@@ -650,16 +650,28 @@ static int uio_mmap_physical(struct vm_area_struct *vma)
 {
        struct uio_device *idev = vma->vm_private_data;
        int mi = uio_find_mem_index(vma);
+       struct uio_mem *mem;
        if (mi < 0)
                return -EINVAL;
+       mem = idev->info->mem + mi;
 
-       vma->vm_flags |= VM_IO | VM_RESERVED;
+       if (vma->vm_end - vma->vm_start > mem->size)
+               return -EINVAL;
 
        vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
 
+       /*
+        * We cannot use the vm_iomap_memory() helper here,
+        * because vma->vm_pgoff is the map index we looked
+        * up above in uio_find_mem_index(), rather than an
+        * actual page offset into the mmap.
+        *
+        * So we just do the physical mmap without a page
+        * offset.
+        */
        return remap_pfn_range(vma,
                               vma->vm_start,
-                              idev->info->mem[mi].addr >> PAGE_SHIFT,
+                              mem->addr >> PAGE_SHIFT,
                               vma->vm_end - vma->vm_start,
                               vma->vm_page_prot);
 }