3.0-stable review patch.  If anyone has any objections, please let me know.

------------------

From: David Howells <dhowells@redhat.com>

commit b94cfaf6685d691dc3fab023cf32f65e9b7be09c upstream.

Don't clear vm_mm in a deleted VMA as it's unnecessary and might
conceivably break the filesystem or driver VMA close routine.

Reported-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 mm/nommu.c |    2 --
 1 file changed, 2 deletions(-)

--- a/mm/nommu.c
+++ b/mm/nommu.c

@@ -780,8 +780,6 @@ static void delete_vma_from_mm(struct vm
 
 	if (vma->vm_next)
 		vma->vm_next->vm_prev = vma->vm_prev;
-
-	vma->vm_mm = NULL;
 }
 
 /*