Add some read's to avoid any PCI posting issues when controlling
irq's.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>

--- a/drivers/net/sky2.c	2009-06-17 10:29:52.005685817 -0700
+++ b/drivers/net/sky2.c	2009-06-17 10:29:53.382997969 -0700
@@ -1495,6 +1495,7 @@ static int sky2_up(struct net_device *de
 	imask = sky2_read32(hw, B0_IMSK);
 	imask |= portirq_msk[port];
 	sky2_write32(hw, B0_IMSK, imask);
+	sky2_read32(hw, B0_IMSK);
 
 	sky2_set_multicast(dev);
 
@@ -1812,6 +1813,7 @@ static int sky2_down(struct net_device *
 	imask = sky2_read32(hw, B0_IMSK);
 	imask &= ~portirq_msk[port];
 	sky2_write32(hw, B0_IMSK, imask);
+	sky2_read32(hw, B0_IMSK);
 
 	synchronize_irq(hw->pdev->irq);
 

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