[NET]: Fix drivers to handle napi_disable() disabling interrupts.

When we add the generic napi_disable_pending() breakout
logic to net_rx_action() it means that napi_disable()
can cause NAPI poll interrupt events to be disabled.

And this is exactly what we want.  If a napi_disable()
is pending, and we are looping in the ->poll(), we want
->poll() event interrupts to stay disabled and we want
to complete the NAPI poll ASAP.

When ->poll() break out during device down was being handled on a
per-driver basis, often these drivers would turn interrupts back on
when '!netif_running()' was detected.

And this would just cause a reschedule of the NAPI ->poll() in the
interrupt handler before the napi_disable() could get in there and
grab the NAPI_STATE_SCHED bit.

The vast majority of drivers don't care if napi_disable() might have
the side effect of disabling NAPI ->poll() event interrupts.  In all
such cases, when a napi_disable() is performed, the driver just
disabled interrupts or is about to.

However there were three exceptions to this in PCNET32, R8169, and
SKY2.  To fix those cases, at the subsequent napi_enable() points, I
added code to ensure that the ->poll() interrupt events are enabled in
the hardware.

Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by:  Don Fry <pcnet32@verizon.net>

drivers/net/pcnet32.c

@@ -455,9 +455,14 @@ static void pcnet32_netif_start(struct net_device *dev)
 {
 #ifdef CONFIG_PCNET32_NAPI
 	struct pcnet32_private *lp = netdev_priv(dev);
+	ulong ioaddr = dev->base_addr;
+	u16 val;
 #endif
 	netif_wake_queue(dev);
 #ifdef CONFIG_PCNET32_NAPI
+	val = lp->a.read_csr(ioaddr, CSR3);
+	val &= 0x00ff;
+	lp->a.write_csr(ioaddr, CSR3, val);
 	napi_enable(&lp->napi);
 #endif
 }

drivers/net/r8169.c

@@ -2398,6 +2398,8 @@ static void rtl8169_wait_for_quiescence(struct net_device *dev)
 	rtl8169_irq_mask_and_ack(ioaddr);
 
 #ifdef CONFIG_R8169_NAPI
+	tp->intr_mask = 0xffff;
+	RTL_W16(IntrMask, tp->intr_event);
 	napi_enable(&tp->napi);
 #endif
 }

drivers/net/sky2.c

@@ -1168,6 +1168,7 @@ static void sky2_vlan_rx_register(struct net_device *dev, struct vlan_group *grp
 			     TX_VLAN_TAG_OFF);
 	}
 
+	sky2_read32(hw, B0_Y2_SP_LISR);
 	napi_enable(&hw->napi);
 	netif_tx_unlock_bh(dev);
 }
@@ -2043,6 +2044,7 @@ static int sky2_change_mtu(struct net_device *dev, int new_mtu)
 	err = sky2_rx_start(sky2);
 	sky2_write32(hw, B0_IMSK, imask);
 
+	sky2_read32(hw, B0_Y2_SP_LISR);
 	napi_enable(&hw->napi);
 
 	if (err)
@@ -3861,6 +3863,7 @@ static int sky2_debug_show(struct seq_file *seq, void *v)
 		   last = sky2_read16(hw, Y2_QADDR(rxqaddr[port], PREF_UNIT_PUT_IDX)),
 		   sky2_read16(hw, Y2_QADDR(rxqaddr[port], PREF_UNIT_LAST_IDX)));
 
+	sky2_read32(hw, B0_Y2_SP_LISR);
 	napi_enable(&hw->napi);
 	return 0;
 }