[PATCH] sky2: support msi interrupt (revised)

This hardware supports Message Signaled interrupts.
When setting up, use software interrupt to check for bad hardware.

Signed-off-by: Stephen Hemminger <shemminger @osdl.org>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>

drivers/net/sky2.h

@@ -1841,6 +1841,7 @@ struct sky2_hw {
 	struct net_device    *dev[2];
 
 	int		     pm_cap;
+	int		     msi;
 	u8	     	     chip_id;
 	u8		     chip_rev;
 	u8		     copper;