NOMMU: Don't need to clear vm_mm when deleting a VMA

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>
cc: stable@vger.kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/nommu.c b/mm/nommu.c
index ee7e57ebef6af70b9143b7e404994ae5b3d58427..f59e170fceb4e01046a339d8878f5030dea8a4f9 100644 (file)
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -779,8 +779,6 @@ static void delete_vma_from_mm(struct vm_area_struct *vma)
 
        if (vma->vm_next)
                vma->vm_next->vm_prev = vma->vm_prev;
-
-       vma->vm_mm = NULL;
 }
 
 /*