[PATCH] Compaq PCI Hotplug bug fix

Found the bug.  The following patch fixes the hot plug
driver so that it has a fallback when there are no unused
IRQs on a system.  At some point intialization got re-
ordered and this was broken.

I found another bug that was preventing the existing scheme from
working.  It looks like the function "pcibios_set_irq_routing" is
returning 1 for success, but the hot plug driver was interpreting it as
failure.

drivers/hotplug/cpqphp_core.c

@@ -1110,6 +1110,9 @@ static int cpqhpc_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	/*
 	 * Get IO, memory, and IRQ resources for new devices
 	 */
+	// The next line is required for cpqhp_find_available_resources
+	ctrl->interrupt = pdev->irq;
+
 	rc = cpqhp_find_available_resources(ctrl, cpqhp_rom_start);
 	ctrl->add_support = !rc;
 	if (rc) {
@@ -1138,7 +1141,6 @@ static int cpqhpc_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	writel(0xFFFFFFFFL, ctrl->hpc_reg + INT_MASK);
 
 	/* set up the interrupt */
-	ctrl->interrupt = pdev->irq;
 	dbg("HPC interrupt = %d \n", ctrl->interrupt);
 	if (request_irq(ctrl->interrupt,
 			(void (*)(int, void *, struct pt_regs *)) &cpqhp_ctrl_intr,

drivers/hotplug/cpqphp_pci.c

@@ -360,8 +360,8 @@ int cpqhp_set_irq (u8 bus_num, u8 dev_num, u8 int_pin, u8 irq_num)
 	    __FUNCTION__, dev_num, bus_num, int_pin, irq_num);
 	rc = pcibios_set_irq_routing(&fakedev, int_pin - 0x0a, irq_num);
 	dbg("%s: rc %d\n", __FUNCTION__, rc);
-	if (rc)
-		return rc;
+	if (!rc)
+		return !rc;
 
 	// set the Edge Level Control Register (ELCR)
 	temp_word = inb(0x4d0);