Add ability to override default irq assigned by the system. This is used
to debug IRQ related problems.

Signed-off-by: Zhu Yi <yi.zhu@intel.com>
--
diff -urp ipw2200-1.0.6/ipw2200.c ipw2200-1.0.6-irq/ipw2200.c
--- ipw2200-1.0.6/ipw2200.c	2005-08-10 10:29:25.000000000 +0800
+++ ipw2200-1.0.6-irq/ipw2200.c	2005-08-15 17:24:50.000000000 +0800
@@ -52,6 +52,7 @@ static int auto_create = 1;
 static int led = 0;
 static int disable = 0;
 static int hwcrypto = 1;
+static int irq = 0;
 static const char ipw_modes[] = {
 	'a', 'b', 'g', '?'
 };
@@ -10714,6 +10715,11 @@ static int ipw_pci_probe(struct pci_dev 
 
 	ipw_sw_reset(priv, 1);
 
+	if (irq) {
+		printk(KERN_INFO "Override default irq from %d to %d.\n",
+		       pdev->irq, irq);
+		pdev->irq = irq;
+	}
 	err = request_irq(pdev->irq, ipw_isr, SA_SHIRQ, DRV_NAME, priv);
 	if (err) {
 		IPW_ERROR("Error allocating IRQ %d\n", pdev->irq);
@@ -11004,5 +11010,8 @@ MODULE_PARM_DESC(mode, "network mode (0=
 module_param(hwcrypto, int, 0444);
 MODULE_PARM_DESC(hwcrypto, "enable hardware crypto (default on)");
 
+module_param(irq, int, 0444);
+MODULE_PARM_DESC(irq, "override defualt irq assigned by the system");
+
 module_exit(ipw_exit);
 module_init(ipw_init);