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xen-gntdev: return -EFAULT on copy_to_user failure

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copy_to_user() returns the amount of data remaining to be copied.  We
want to return a negative error code here.  The upper layers just
call WARN_ON() if we return non-zero so this doesn't change the
behavior.  But returning -EFAULT is still cleaner.

Signed-off-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Dan Carpenter 2011-03-19 08:44:34 +03:00 committed by Konrad Rzeszutek Wilk
parent 804f185369
commit 12f0258d5b
1 changed files with 1 additions and 1 deletions
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2
drivers/xen/gntdev.c
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@ -273,7 +273,7 @@ static int __unmap_grant_pages(struct grant_map *map, int offset, int pages)
map->vma->vm_start + map->notify.addr;
err = copy_to_user(tmp, &err, 1);
if (err)
return err;
return -EFAULT;
map->notify.flags &= ~UNMAP_NOTIFY_CLEAR_BYTE;
} else if (pgno >= offset && pgno < offset + pages) {
uint8_t *tmp = kmap(map->pages[pgno]);