sky2: MSI test timing

The test for MSI IRQ could have timing issues. The PCI write needs to be 
pushed out before waiting, and the wait queue should be initialized before
the IRQ.

Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/net/sky2.c

@@ -3184,6 +3184,8 @@ static int __devinit sky2_test_msi(struct sky2_hw *hw)
 	struct pci_dev *pdev = hw->pdev;
 	int err;
 
+	init_waitqueue_head (&hw->msi_wait);
+
 	sky2_write32(hw, B0_IMSK, Y2_IS_IRQ_SW);
 
 	err = request_irq(pdev->irq, sky2_test_intr, SA_SHIRQ, DRV_NAME, hw);
@@ -3193,10 +3195,8 @@ static int __devinit sky2_test_msi(struct sky2_hw *hw)
 		return err;
 	}
 
-	init_waitqueue_head (&hw->msi_wait);
-
 	sky2_write8(hw, B0_CTST, CS_ST_SW_IRQ);
-	wmb();
+	sky2_read8(hw, B0_CTST);
 
 	wait_event_timeout(hw->msi_wait, hw->msi_detected, HZ/10);