[PATCH] shpchp: event handling rework

The event handler of SHPCHP driver is unnecessarily very complex. In
addition, current event handler can only a fixed number of events at
the same time, and some of events would be lost if several number of
events happened at the same time.

This patch simplify the event handler by using 'work queue', and it
also fix the above-mentioned issue.

Signed-off-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Signed-off-by: Kristen Carlson Accardi <kristen.c.accardi@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/pci/hotplug/shpchp_hpc.c

@@ -813,6 +813,7 @@ static void hpc_release_ctlr(struct controller *ctrl)
 {
 	struct php_ctlr_state_s *php_ctlr = ctrl->hpc_ctlr_handle;
 	struct php_ctlr_state_s *p, *p_prev;
+	int i;
 
 	DBG_ENTER_ROUTINE 
 
@@ -821,6 +822,14 @@ static void hpc_release_ctlr(struct controller *ctrl)
 		return ;
 	}
 
+	/*
+	 * Mask all slot event interrupts
+	 */
+	for (i = 0; i < ctrl->num_slots; i++)
+		writel(0xffff3fff, php_ctlr->creg + SLOT1 + (4 * i));
+
+	cleanup_slots(ctrl);
+
 	if (shpchp_poll_mode) {
 	    del_timer(&php_ctlr->int_poll_timer);
 	} else {	
@@ -830,6 +839,7 @@ static void hpc_release_ctlr(struct controller *ctrl)
 			pci_disable_msi(php_ctlr->pci_dev);
 		}
 	}
+
 	if (php_ctlr->pci_dev) {
 		iounmap(php_ctlr->creg);
 		release_mem_region(ctrl->mmio_base, ctrl->mmio_size);