Revert "[PATCH] namespaces: fix exit race by splitting exit"

This reverts commit 7a238fcba0 in
preparation for a better and simpler fix proposed by Eric Biederman
(and fixed up by Serge Hallyn)

Acked-by: Serge E. Hallyn <serue@us.ibm.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

kernel/nsproxy.c

@@ -117,7 +117,7 @@ int copy_namespaces(int flags, struct task_struct *tsk)
 		goto out_pid;
 
 out:
-	put_and_finalize_nsproxy(old_ns);
+	put_nsproxy(old_ns);
 	return err;
 
 out_pid:
@@ -135,20 +135,6 @@ out_ns:
 	goto out;
 }
 
-struct nsproxy *put_nsproxy(struct nsproxy *ns)
-{
-	if (ns) {
-		if (atomic_dec_and_test(&ns->count)) {
-			if (ns->mnt_ns) {
-				put_mnt_ns(ns->mnt_ns);
-				ns->mnt_ns = NULL;
-			}
-			return ns;
-		}
-	}
-	return NULL;
-}
-
 void free_nsproxy(struct nsproxy *ns)
 {
 	if (ns->mnt_ns)