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authorLinus Torvalds <torvalds@linux-foundation.org>2013-04-19 09:53:07 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-04-25 21:23:49 -0700
commit856398d852436111d5cdbf30374f576671903998 (patch)
tree725b3bfdc763422c82020bca1f8b85166c204220
parent102fe50d961cf56eb764959783485193884ab1e6 (diff)
downloadlinux-linaro-stable-856398d852436111d5cdbf30374f576671903998.tar.gz
vm: convert mtdchar mmap to vm_iomap_memory() helper
commit 8558e4a26b00225efeb085725bc319f91201b239 upstream. This is my example conversion of a few existing mmap users. The mtdchar case is actually disabled right now (and stays disabled), but I did it because it showed up on my "git grep", and I was familiar with the code due to fixing an overflow problem in the code in commit 9c603e53d380 ("mtdchar: fix offset overflow detection"). Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--drivers/mtd/mtdchar.c32
1 files changed, 2 insertions, 30 deletions
diff --git a/drivers/mtd/mtdchar.c b/drivers/mtd/mtdchar.c
index 9892dcc..72b788e 100644
--- a/drivers/mtd/mtdchar.c
+++ b/drivers/mtd/mtdchar.c
@@ -1100,45 +1100,17 @@ static int mtd_mmap(struct file *file, struct vm_area_struct *vma)
struct mtd_file_info *mfi = file->private_data;
struct mtd_info *mtd = mfi->mtd;
struct map_info *map = mtd->priv;
- resource_size_t start, off;
- unsigned long len, vma_len;
/* This is broken because it assumes the MTD device is map-based
and that mtd->priv is a valid struct map_info. It should be
replaced with something that uses the mtd_get_unmapped_area()
operation properly. */
if (0 /*mtd->type == MTD_RAM || mtd->type == MTD_ROM*/) {
- off = get_vm_offset(vma);
- start = map->phys;
- len = PAGE_ALIGN((start & ~PAGE_MASK) + map->size);
- start &= PAGE_MASK;
- vma_len = get_vm_size(vma);
-
- /* Overflow in off+len? */
- if (vma_len + off < off)
- return -EINVAL;
- /* Does it fit in the mapping? */
- if (vma_len + off > len)
- return -EINVAL;
-
- off += start;
- /* Did that overflow? */
- if (off < start)
- return -EINVAL;
- if (set_vm_offset(vma, off) < 0)
- return -EINVAL;
- vma->vm_flags |= VM_IO | VM_RESERVED;
-
#ifdef pgprot_noncached
- if (file->f_flags & O_DSYNC || off >= __pa(high_memory))
+ if (file->f_flags & O_DSYNC || map->phys >= __pa(high_memory))
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
#endif
- if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
- vma->vm_end - vma->vm_start,
- vma->vm_page_prot))
- return -EAGAIN;
-
- return 0;
+ return vm_iomap_memory(vma, map->phys, map->size);
}
return -ENOSYS;
#else