s390: don't call iucv_path_connect from tasklet context

net/iucv/iucv.c creates the requirement for
iucv_path_connect not to be called from tasklet context anymore.
An extra checking is added in case of a failing netiucv_tx
to fulfil this requirement for netiucv.
Signed-off-by: Ursula Braun <braunu@de.ibm.com>
Signed-off-by: Frank Pavlic <fpavlic@de.ibm.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

drivers/s390/net/netiucv.c

@@ -1315,7 +1315,8 @@ static int netiucv_tx(struct sk_buff *skb, struct net_device *dev)
 	 * and throw away packet.
 	 */
 	if (fsm_getstate(privptr->fsm) != DEV_STATE_RUNNING) {
-		fsm_event(privptr->fsm, DEV_EVENT_START, dev);
+		if (!in_atomic())
+			fsm_event(privptr->fsm, DEV_EVENT_START, dev);
 		dev_kfree_skb(skb);
 		privptr->stats.tx_dropped++;
 		privptr->stats.tx_errors++;