[POWERPC] EEH recovery tweaks

If one attempts to create a device driver recovery sequence that
does not depend on a hard reset of the device, but simply just
attempts to resume processing, then one discovers that the
recovery sequence implemented on powerpc is not quite right.
This patch fixes this up.

Signed-off-by: Linas Vepstas <linas@austin.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/platforms/pseries/eeh.c

@@ -337,6 +337,7 @@ int eeh_dn_check_failure(struct device_node *dn, struct pci_dev *dev)
 			printk (KERN_ERR "EEH: Device driver ignored %d bad reads, panicing\n",
 			        pdn->eeh_check_count);
 			dump_stack();
+			msleep(5000);
 
 			/* re-read the slot reset state */
 			if (read_slot_reset_state(pdn, rets) != 0)

arch/powerpc/platforms/pseries/eeh_driver.c

@@ -170,14 +170,19 @@ static void eeh_report_reset(struct pci_dev *dev, void *userdata)
 static void eeh_report_resume(struct pci_dev *dev, void *userdata)
 {
 	struct pci_driver *driver = dev->driver;
+	struct device_node *dn = pci_device_to_OF_node(dev);
 
 	dev->error_state = pci_channel_io_normal;
 
 	if (!driver)
 		return;
-	if (!driver->err_handler)
-		return;
-	if (!driver->err_handler->resume)
+
+	if ((PCI_DN(dn)->eeh_mode) & EEH_MODE_IRQ_DISABLED) {
+		PCI_DN(dn)->eeh_mode &= ~EEH_MODE_IRQ_DISABLED;
+		enable_irq(dev->irq);
+	}
+	if (!driver->err_handler ||
+	    !driver->err_handler->resume)
 		return;
 
 	driver->err_handler->resume(dev);
@@ -407,6 +412,8 @@ struct pci_dn * handle_eeh_events (struct eeh_event *event)
 
 		if (rc)
 			result = PCI_ERS_RESULT_NEED_RESET;
+		else
+			result = PCI_ERS_RESULT_RECOVERED;
 	}
 
 	/* If any device has a hard failure, then shut off everything. */