[PATCH] shpchp: Fix slot state handling

Current SHPCHP driver doesn't care about the confliction between
hotplug operation via sysfs and hotplug operation via attention
button. So if those ware conflicted, slot could be an unexpected
state.

This patch changes SHPCHP driver to handle slot state properly. With
this patch, slot events are handled according to the current slot
state as shown at the Table below.

		Table. Slot States and Event Handling
=========================================================================
Slot State		Event and Action
=========================================================================
STATIC			- Go to POWERON state if user initiates
(Slot enabled,		  insertion request via sysfs
 Slot disabled)		- Go to POWEROFF state if user initiates removal
			  request via sysfs
			- Go to BLINKINGON state if user presses
			  attention button when the slot is disabled
			- Go to BLINKINGOFF state if user presses
			  attention button when the slot is enabled

1 files changed, 4 insertions, 3 deletions

diff --git a/drivers/pci/hotplug/shpchp.h b/drivers/pci/hotplug/shpchp.h
index 87db07cfebdf..dd449512cf68 100644
--- a/drivers/pci/hotplug/shpchp.h
+++ b/drivers/pci/hotplug/shpchp.h
@@ -72,6 +72,7 @@ struct slot {
         struct list_head        slot_list;
         char name[SLOT_NAME_SIZE];
         struct work_struct work;        /* work for button event */
+        struct mutex lock;
 };
 
 struct event_info {
@@ -181,8 +182,8 @@ struct hotplug_params {
 /* sysfs functions for the hotplug controller info */
 extern void shpchp_create_ctrl_files    (struct controller *ctrl);
 
-extern int      shpchp_enable_slot(struct slot *slot);
-extern int      shpchp_disable_slot(struct slot *slot);
+extern int      shpchp_sysfs_enable_slot(struct slot *slot);
+extern int      shpchp_sysfs_disable_slot(struct slot *slot);
 
 extern u8       shpchp_handle_attention_button(u8 hp_slot, void *inst_id);
 extern u8       shpchp_handle_switch_change(u8 hp_slot, void *inst_id);
@@ -200,7 +201,7 @@ 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);
+extern void     queue_pushbutton_work(void *data);
 
 /* Global variables */
 extern struct list_head shpchp_ctrl_list;