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>

1 files changed, 12 insertions, 19 deletions

diff --git a/drivers/input/gameport/gameport.c b/drivers/input/gameport/gameport.c
index f20c3f23388b..d7dfa6f53cf6 100644
--- a/drivers/input/gameport/gameport.c
+++ b/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);