[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>

1 files changed, 6 insertions, 7 deletions

diff --git a/drivers/pci/hotplug/shpchp.h b/drivers/pci/hotplug/shpchp.h
index 6e1fb1b..87db07c 100644
--- a/drivers/pci/hotplug/shpchp.h
+++ b/drivers/pci/hotplug/shpchp.h
@@ -46,6 +46,7 @@
 extern int shpchp_poll_mode;
 extern int shpchp_poll_time;
 extern int shpchp_debug;
+extern struct workqueue_struct *shpchp_wq;
 
 /*#define dbg(format, arg...) do { if (shpchp_debug) printk(KERN_DEBUG "%s: " format, MY_NAME , ## arg); } while (0)*/
 #define dbg(format, arg...) do { if (shpchp_debug) printk("%s: " format, MY_NAME , ## arg); } while (0)
@@ -70,11 +71,13 @@ struct slot {
 	struct hotplug_slot *hotplug_slot;
 	struct list_head	slot_list;
 	char name[SLOT_NAME_SIZE];
+	struct work_struct work;	/* work for button event */
 };
 
 struct event_info {
 	u32 event_type;
-	u8 hp_slot;
+	struct slot *p_slot;
+	struct work_struct work;
 };
 
 struct controller {
@@ -85,11 +88,9 @@ struct controller {
 	int num_slots;			/* Number of slots on ctlr */
 	int slot_num_inc;		/* 1 or -1 */
 	struct pci_dev *pci_dev;
-	struct event_info event_queue[10];
 	struct list_head slot_list;
 	struct hpc_ops *hpc_ops;
 	wait_queue_head_t queue;	/* sleep & wake process */
-	u8 next_event;
 	u8 bus;
 	u8 device;
 	u8 function;
@@ -180,9 +181,6 @@ struct hotplug_params {
 /* sysfs functions for the hotplug controller info */
 extern void shpchp_create_ctrl_files	(struct controller *ctrl);
 
-/* controller functions */
-extern int	shpchp_event_start_thread(void);
-extern void	shpchp_event_stop_thread(void);
 extern int	shpchp_enable_slot(struct slot *slot);
 extern int	shpchp_disable_slot(struct slot *slot);
 
@@ -201,7 +199,8 @@ extern void	get_hp_params_from_firmware(struct pci_dev *dev,
 extern int	shpchprm_get_physical_slot_number(struct controller *ctrl,
 		u32 *sun, u8 busnum, u8 devnum);
 extern void	shpchp_remove_ctrl_files(struct controller *ctrl);
-
+extern void	cleanup_slots(struct controller *ctrl);
+extern void	shpchp_pushbutton_thread(void *data);
 
 /* Global variables */
 extern struct list_head shpchp_ctrl_list;