[PATCH] USB: khubd: use kthread API

Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/core/hub.c

@@ -26,6 +26,7 @@
 #include <linux/ioctl.h>
 #include <linux/usb.h>
 #include <linux/usbdevice_fs.h>
+#include <linux/kthread.h>
 
 #include <asm/semaphore.h>
 #include <asm/uaccess.h>
@@ -47,8 +48,7 @@ static LIST_HEAD(hub_event_list);	/* List of hubs needing servicing */
 /* Wakes up khubd */
 static DECLARE_WAIT_QUEUE_HEAD(khubd_wait);
 
-static pid_t khubd_pid = 0;			/* PID of khubd */
-static DECLARE_COMPLETION(khubd_exited);
+static struct task_struct *khubd_task;
 
 /* cycle leds on hubs that aren't blinking for attention */
 static int blinkenlights = 0;
@@ -2807,23 +2807,16 @@ static void hub_events(void)
 
 static int hub_thread(void *__unused)
 {
-	/*
-	 * This thread doesn't need any user-level access,
-	 * so get rid of all our resources
-	 */
-
-	daemonize("khubd");
-	allow_signal(SIGKILL);
-
-	/* Send me a signal to get me die (for debugging) */
 	do {
 		hub_events();
-		wait_event_interruptible(khubd_wait, !list_empty(&hub_event_list)); 
+		wait_event_interruptible(khubd_wait,
+				!list_empty(&hub_event_list) ||
+				kthread_should_stop());
 		try_to_freeze();
-	} while (!signal_pending(current));
+	} while (!kthread_should_stop() || !list_empty(&hub_event_list));
 
-	pr_debug ("%s: khubd exiting\n", usbcore_name);
-	complete_and_exit(&khubd_exited, 0);
+	pr_debug("%s: khubd exiting\n", usbcore_name);
+	return 0;
 }
 
 static struct usb_device_id hub_id_table [] = {
@@ -2849,20 +2842,15 @@ static struct usb_driver hub_driver = {
 
 int usb_hub_init(void)
 {
-	pid_t pid;
-
 	if (usb_register(&hub_driver) < 0) {
 		printk(KERN_ERR "%s: can't register hub driver\n",
 			usbcore_name);
 		return -1;
 	}
 
-	pid = kernel_thread(hub_thread, NULL, CLONE_KERNEL);
-	if (pid >= 0) {
-		khubd_pid = pid;
-
+	khubd_task = kthread_run(hub_thread, NULL, "khubd");
+	if (!IS_ERR(khubd_task))
 		return 0;
-	}
 
 	/* Fall through if kernel_thread failed */
 	usb_deregister(&hub_driver);
@@ -2873,12 +2861,7 @@ int usb_hub_init(void)
 
 void usb_hub_cleanup(void)
 {
-	int ret;
-
-	/* Kill the thread */
-	ret = kill_proc(khubd_pid, SIGKILL, 1);
-
-	wait_for_completion(&khubd_exited);
+	kthread_stop(khubd_task);
 
 	/*
 	 * Hub resources are freed for us by usb_deregister. It calls
@@ -2890,7 +2873,6 @@ void usb_hub_cleanup(void)
 	usb_deregister(&hub_driver);
 } /* usb_hub_cleanup() */
 
-
 static int config_descriptors_changed(struct usb_device *udev)
 {
 	unsigned			index;