[PATCH] knfsd: Check return value of lockd_up in write_ports

We should be checking the return value of lockd_up when adding a new socket to
nfsd.  So move the lockd_up before the svc_addsock and check the return value.

The move is because lockd_down is easy, but there is no easy way to remove a
recently added socket.

Cc: "J. Bruce Fields" <bfields@fieldses.org>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

fs/nfsd/nfsctl.c

@@ -454,12 +454,15 @@ static ssize_t write_ports(struct file *file, char *buf, size_t size)
 		err = nfsd_create_serv();
 		if (!err) {
 			int proto = 0;
-			err = svc_addsock(nfsd_serv, fd, buf, &proto);
+			err = lockd_up(proto);
+			if (!err) {
+				err = svc_addsock(nfsd_serv, fd, buf, &proto);
+				if (err)
+					lockd_down();
+			}
 			/* Decrease the count, but don't shutdown the
 			 * the service
 			 */
-			if (err >= 0)
-				lockd_up(proto);
 			nfsd_serv->sv_nrthreads--;
 		}
 		return err;