Don't call napi_disable if not configured.
And make sure that any misuse of napi_xxx in future fails
with a compile error.

Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>

--- a/drivers/net/r8169.c	2007-10-24 21:38:43.000000000 -0700
+++ b/drivers/net/r8169.c	2007-10-26 11:27:02.000000000 -0700
@@ -392,7 +392,9 @@ struct rtl8169_private {
 	void __iomem *mmio_addr;	/* memory map physical address */
 	struct pci_dev *pci_dev;	/* Index of PCI device */
 	struct net_device *dev;
+#ifdef CONFIG_R8169_NAPI
 	struct napi_struct napi;
+#endif
 	spinlock_t lock;		/* spin lock flag */
 	u32 msg_enable;
 	int chipset;
@@ -2989,13 +2991,16 @@ static void rtl8169_down(struct net_devi
 {
 	struct rtl8169_private *tp = netdev_priv(dev);
 	void __iomem *ioaddr = tp->mmio_addr;
-	unsigned int poll_locked = 0;
 	unsigned int intrmask;
 
 	rtl8169_delete_timer(dev);
 
 	netif_stop_queue(dev);
 
+#ifdef CONFIG_R8169_NAPI
+	napi_disable(&tp->napi);
+#endif
+
 core_down:
 	spin_lock_irq(&tp->lock);
 
@@ -3009,11 +3014,6 @@ core_down:
 
 	synchronize_irq(dev->irq);
 
-	if (!poll_locked) {
-		napi_disable(&tp->napi);
-		poll_locked++;
-	}
-
 	/* Give a racing hard_start_xmit a few cycles to complete. */
 	synchronize_sched();  /* FIXME: should this be synchronize_irq()? */
 
-
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