Input: switch gameport core to using kthread API instead of

       using daemonize() and signals. This way kgameportd will
       never be accidentially killed.

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

drivers/input/gameport/gameport.c

@@ -17,11 +17,10 @@
 #include <linux/init.h>
 #include <linux/gameport.h>
 #include <linux/wait.h>
-#include <linux/completion.h>
 #include <linux/sched.h>
-#include <linux/smp_lock.h>
 #include <linux/slab.h>
 #include <linux/delay.h>
+#include <linux/kthread.h>
 
 /*#include <asm/io.h>*/
 
@@ -238,8 +237,7 @@ struct gameport_event {
 static DEFINE_SPINLOCK(gameport_event_lock);	/* protects gameport_event_list */
 static LIST_HEAD(gameport_event_list);
 static DECLARE_WAIT_QUEUE_HEAD(gameport_wait);
-static DECLARE_COMPLETION(gameport_exited);
-static int gameport_pid;
+static struct task_struct *gameport_task;
 
 static void gameport_queue_event(void *object, struct module *owner,
 			      enum gameport_event_type event_type)
@@ -250,12 +248,12 @@ static void gameport_queue_event(void *object, struct module *owner,
 	spin_lock_irqsave(&gameport_event_lock, flags);
 
 	/*
- 	 * Scan event list for the other events for the same gameport port,
+	 * Scan event list for the other events for the same gameport port,
 	 * starting with the most recent one. If event is the same we
 	 * do not need add new one. If event is of different type we
 	 * need to add this event and should not look further because
 	 * we need to preseve sequence of distinct events.
- 	 */
+	 */
 	list_for_each_entry_reverse(event, &gameport_event_list, node) {
 		if (event->object == object) {
 			if (event->type == event_type)
@@ -432,20 +430,15 @@ static struct gameport *gameport_get_pending_child(struct gameport *parent)
 
 static int gameport_thread(void *nothing)
 {
-	lock_kernel();
-	daemonize("kgameportd");
-	allow_signal(SIGTERM);
-
 	do {
 		gameport_handle_events();
-		wait_event_interruptible(gameport_wait, !list_empty(&gameport_event_list));
+		wait_event_interruptible(gameport_wait,
+			kthread_should_stop() || !list_empty(&gameport_event_list));
 		try_to_freeze(PF_FREEZE);
-	} while (!signal_pending(current));
+	} while (!kthread_should_stop());
 
 	printk(KERN_DEBUG "gameport: kgameportd exiting\n");
-
-	unlock_kernel();
-	complete_and_exit(&gameport_exited, 0);
+	return 0;
 }
 
 
@@ -773,9 +766,10 @@ void gameport_close(struct gameport *gameport)
 
 static int __init gameport_init(void)
 {
-	if (!(gameport_pid = kernel_thread(gameport_thread, NULL, CLONE_KERNEL))) {
+	gameport_task = kthread_run(gameport_thread, NULL, "kgameportd");
+	if (IS_ERR(gameport_task)) {
 		printk(KERN_ERR "gameport: Failed to start kgameportd\n");
-		return -1;
+		return PTR_ERR(gameport_task);
 	}
 
 	gameport_bus.dev_attrs = gameport_device_attrs;
@@ -789,8 +783,7 @@ static int __init gameport_init(void)
 static void __exit gameport_exit(void)
 {
 	bus_unregister(&gameport_bus);
-	kill_proc(gameport_pid, SIGTERM, 1);
-	wait_for_completion(&gameport_exited);
+	kthread_stop(gameport_task);
 }
 
 module_init(gameport_init);