Merge branch 'usb-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh...

[pandora-kernel.git] / kernel / exit.c

diff --git a/kernel/exit.c b/kernel/exit.c
index 20a4064..f2b321b 100644 (file)
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -561,29 +561,28 @@ void exit_files(struct task_struct *tsk)
 
 #ifdef CONFIG_MM_OWNER
 /*
- * Task p is exiting and it owned mm, lets find a new owner for it
+ * A task is exiting.   If it owned this mm, find a new owner for the mm.
  */
-static inline int
-mm_need_new_owner(struct mm_struct *mm, struct task_struct *p)
-{
-       /*
-        * If there are other users of the mm and the owner (us) is exiting
-        * we need to find a new owner to take on the responsibility.
-        */
-       if (atomic_read(&mm->mm_users) <= 1)
-               return 0;
-       if (mm->owner != p)
-               return 0;
-       return 1;
-}
-
 void mm_update_next_owner(struct mm_struct *mm)
 {
        struct task_struct *c, *g, *p = current;
 
 retry:
-       if (!mm_need_new_owner(mm, p))
+       /*
+        * If the exiting or execing task is not the owner, it's
+        * someone else's problem.
+        */
+       if (mm->owner != p)
                return;
+       /*
+        * The current owner is exiting/execing and there are no other
+        * candidates.  Do not leave the mm pointing to a possibly
+        * freed task structure.
+        */
+       if (atomic_read(&mm->mm_users) <= 1) {
+               mm->owner = NULL;
+               return;
+       }
 
        read_lock(&tasklist_lock);
        /*