sky2: status irq hang fix

The status interrupt flag should be cleared before processing,
not afterwards to avoid race. Need to process in poll routine
even if no new interrupt status. This is a normal occurrence when
more than 64 frames (NAPI weight) are processed in one poll routine.
Signed-off-by: Stephen Hemminger <shemminger@osdl.org>

drivers/net/sky2.c

@@ -2105,7 +2105,6 @@ static int sky2_poll(struct net_device *dev0, int *budget)
 	int work_done = 0;
 	u32 status = sky2_read32(hw, B0_Y2_SP_EISR);
 
-	if (unlikely(status & ~Y2_IS_STAT_BMU)) {
 	if (status & Y2_IS_HW_ERR)
 		sky2_hw_intr(hw);
 
@@ -2132,9 +2131,10 @@ static int sky2_poll(struct net_device *dev0, int *budget)
 
 	if (status & Y2_IS_CHK_TXA2)
 		sky2_descriptor_error(hw, 1, "transmit", Y2_IS_CHK_TXA2);
-	}
 
-	if (status & Y2_IS_STAT_BMU) {
+	if (status & Y2_IS_STAT_BMU)
+		sky2_write32(hw, STAT_CTRL, SC_STAT_CLR_IRQ);
+
 	work_done = sky2_status_intr(hw, work_limit);
 	*budget -= work_done;
 	dev0->quota -= work_done;
@@ -2142,9 +2142,6 @@ static int sky2_poll(struct net_device *dev0, int *budget)
 	if (work_done >= work_limit)
 		return 1;
 
-		sky2_write32(hw, STAT_CTRL, SC_STAT_CLR_IRQ);
-	}
-
 	mod_timer(&hw->idle_timer, jiffies + HZ);
 
 	netif_rx_complete(dev0);