ipg: balance locking in irq handler

Spotted-by: <linux@horizon.com>
Signed-off-by: Francois Romieu <romieu@fr.zoreil.com>

drivers/net/ipg.c

@@ -1630,6 +1630,8 @@ static irqreturn_t ipg_interrupt_handler(int irq, void *dev_inst)
 #ifdef JUMBO_FRAME
 	ipg_nic_rxrestore(dev);
 #endif
+	spin_lock(&sp->lock);
+
 	/* Get interrupt source information, and acknowledge
 	 * some (i.e. TxDMAComplete, RxDMAComplete, RxEarly,
 	 * IntRequested, MacControlFrame, LinkEvent) interrupts
@@ -1647,9 +1649,7 @@ static irqreturn_t ipg_interrupt_handler(int irq, void *dev_inst)
 	handled = 1;
 
 	if (unlikely(!netif_running(dev)))
-		goto out;
-
-	spin_lock(&sp->lock);
+		goto out_unlock;
 
 	/* If RFDListEnd interrupt, restore all used RFDs. */
 	if (status & IPG_IS_RFD_LIST_END) {
@@ -1733,9 +1733,9 @@ static irqreturn_t ipg_interrupt_handler(int irq, void *dev_inst)
 	ipg_w16(IPG_IE_TX_DMA_COMPLETE | IPG_IE_RX_DMA_COMPLETE |
 		IPG_IE_HOST_ERROR | IPG_IE_INT_REQUESTED | IPG_IE_TX_COMPLETE |
 		IPG_IE_LINK_EVENT | IPG_IE_UPDATE_STATS, INT_ENABLE);
-
+out_unlock:
 	spin_unlock(&sp->lock);
-out:
+
 	return IRQ_RETVAL(handled);
 }