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uio: fix finding mm index for vma 

When finding mm index for vma it looks more flexible that the mm could
be sparse, and both the size of mm and the pgoff of vma could give
correct selection.

Signed-off-by: Hillf Danton <dhillf@gmail.com>
Signed-off-by: Hans J. Koch <hjk@hansjkoch.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Hillf Danton 2011-03-28 23:33:26 +02:00 committed by Greg Kroah-Hartman
parent d8408aef91
commit f0c554fddd
1 changed files with 3 additions and 5 deletions
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8
drivers/uio/uio.c
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@ -587,14 +587,12 @@ static ssize_t uio_write(struct file *filep, const char __user *buf,
static int uio_find_mem_index(struct vm_area_struct *vma)
{
int mi;
struct uio_device *idev = vma->vm_private_data;
for (mi = 0; mi < MAX_UIO_MAPS; mi++) {
if (idev->info->mem[mi].size == 0)
if (vma->vm_pgoff < MAX_UIO_MAPS) {
if (idev->info->mem[vma->vm_pgoff].size == 0)
return -1;
if (vma->vm_pgoff == mi)
return mi;
return (int)vma->vm_pgoff;
}
return -1;
}