[PATCH] ppc64: iSeries fix virtual ethernet transmit block

From: Stephen Rothwell <sfr@canb.auug.org.au>

This patch fixes the virtual ethernet driver so that it will not block the
transmit queue indefinitely.  This patch appplies on top of the previous
patch from Rusty that removed skb_clone.  There is one white space fix in
hte middle of this - I hope that doesn't offend :-).
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/net/iseries_veth.c

@@ -461,6 +461,11 @@ static void veth_statemachine(void *p)
 		if (cnx->msgs)
 			for (i = 0; i < VETH_NUMBUFFERS; ++i)
 				veth_recycle_msg(cnx, cnx->msgs + i);
+		spin_unlock_irq(&cnx->lock);
+		veth_flush_pending(cnx);
+		spin_lock_irq(&cnx->lock);
+		if (cnx->state & VETH_STATE_RESET)
+			goto restart;
 	}
 
 	if (cnx->state & VETH_STATE_SHUTDOWN)
@@ -975,12 +980,13 @@ static int veth_start_xmit(struct sk_buff *skb, struct net_device *dev)
 		lpmask = port->lpar_map;
 	}
 
+	spin_lock_irqsave(&port->pending_gate, flags);
+
 	lpmask = veth_transmit_to_many(skb, lpmask, dev);
 
 	if (! lpmask) {
 		dev_kfree_skb(skb);
 	} else {
-		spin_lock_irqsave(&port->pending_gate, flags);
 		if (port->pending_skb) {
 			veth_error("%s: Tx while skb was pending!\n",
 				   dev->name);
@@ -992,9 +998,9 @@ static int veth_start_xmit(struct sk_buff *skb, struct net_device *dev)
 		port->pending_skb = skb;
 		port->pending_lpmask = lpmask;
 		netif_stop_queue(dev);
+	}
 
 	spin_unlock_irqrestore(&port->pending_gate, flags);
-	}
 
 	return 0;
 }
@@ -1049,7 +1055,7 @@ static void veth_flush_pending(struct veth_lpar_connection *cnx)
 			if (! port->pending_lpmask) {
 				dev_kfree_skb_any(port->pending_skb);
 				port->pending_skb = NULL;
-				netif_start_queue(dev);
+				netif_wake_queue(dev);
 			}
 		}
 		spin_unlock_irqrestore(&port->pending_gate, flags);