PCI: cpqphp: Convert timers to use timer_setup()

In preparation for unconditionally passing the struct timer_list pointer to
all timer callbacks, switch to using the new timer_setup() and from_timer()
to pass the timer pointer explicitly.  This has the result of fixing
pushbutton_helper_thread(), which was truncating the event pointer to 32
bits.

Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Arvind Yadav <arvind.yadav.cs@gmail.com>
Cc: Quentin Lambert <lambert.quentin@gmail.com>
Cc: Aleksandr Bezzubikov <zuban32s@gmail.com>
Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Marcel Apfelbaum <marcel@redhat.com>

drivers/pci/hotplug/cpqphp.h

@@ -410,7 +410,7 @@ void cpqhp_create_debugfs_files(struct controller *ctrl);
 void cpqhp_remove_debugfs_files(struct controller *ctrl);
 
 /* controller functions */
-void cpqhp_pushbutton_thread(unsigned long event_pointer);
+void cpqhp_pushbutton_thread(struct timer_list *t);
 irqreturn_t cpqhp_ctrl_intr(int IRQ, void *data);
 int cpqhp_find_available_resources(struct controller *ctrl,
 				   void __iomem *rom_start);

drivers/pci/hotplug/cpqphp_core.c

@@ -661,9 +661,8 @@ static int ctrl_slot_setup(struct controller *ctrl,
 
 		slot->p_sm_slot = slot_entry;
 
-		init_timer(&slot->task_event);
+		timer_setup(&slot->task_event, cpqhp_pushbutton_thread, 0);
 		slot->task_event.expires = jiffies + 5 * HZ;
-		slot->task_event.function = cpqhp_pushbutton_thread;
 
 		/*FIXME: these capabilities aren't used but if they are
 		 *	 they need to be correctly implemented

drivers/pci/hotplug/cpqphp_ctrl.c

@@ -47,7 +47,7 @@ static void interrupt_event_handler(struct controller *ctrl);
 
 
 static struct task_struct *cpqhp_event_thread;
-static unsigned long pushbutton_pending;	/* = 0 */
+static struct timer_list *pushbutton_pending;	/* = NULL */
 
 /* delay is in jiffies to wait for */
 static void long_delay(int delay)
@@ -1732,9 +1732,10 @@ static u32 remove_board(struct pci_func *func, u32 replace_flag, struct controll
 	return 0;
 }
 
-static void pushbutton_helper_thread(unsigned long data)
+static void pushbutton_helper_thread(struct timer_list *t)
 {
-	pushbutton_pending = data;
+	pushbutton_pending = t;
+
 	wake_up_process(cpqhp_event_thread);
 }
 
@@ -1883,13 +1884,13 @@ static void interrupt_event_handler(struct controller *ctrl)
 					wait_for_ctrl_irq(ctrl);
 
 					mutex_unlock(&ctrl->crit_sect);
-					init_timer(&p_slot->task_event);
+					timer_setup(&p_slot->task_event,
+						    pushbutton_helper_thread,
+						    0);
 					p_slot->hp_slot = hp_slot;
 					p_slot->ctrl = ctrl;
 /*					p_slot->physical_slot = physical_slot; */
 					p_slot->task_event.expires = jiffies + 5 * HZ;   /* 5 second delay */
-					p_slot->task_event.function = pushbutton_helper_thread;
-					p_slot->task_event.data = (u32) p_slot;
 
 					dbg("add_timer p_slot = %p\n", p_slot);
 					add_timer(&p_slot->task_event);
@@ -1920,15 +1921,15 @@ static void interrupt_event_handler(struct controller *ctrl)
  * Scheduled procedure to handle blocking stuff for the pushbuttons.
  * Handles all pending events and exits.
  */
-void cpqhp_pushbutton_thread(unsigned long slot)
+void cpqhp_pushbutton_thread(struct timer_list *t)
 {
 	u8 hp_slot;
 	u8 device;
 	struct pci_func *func;
-	struct slot *p_slot = (struct slot *) slot;
+	struct slot *p_slot = from_timer(p_slot, t, task_event);
 	struct controller *ctrl = (struct controller *) p_slot->ctrl;
 
-	pushbutton_pending = 0;
+	pushbutton_pending = NULL;
 	hp_slot = p_slot->hp_slot;
 
 	device = p_slot->device;