ubifs: Make use of the helper macro kthread_run()

Repalce kthread_create/wake_up_process() with kthread_run()
to simplify the code.
Signed-off-by: Cai Huoqing <caihuoqing@baidu.com>
Signed-off-by: Richard Weinberger <richard@nod.at>

fs/ubifs/super.c

@@ -1367,7 +1367,7 @@ static int mount_ubifs(struct ubifs_info *c)
 	sprintf(c->bgt_name, BGT_NAME_PATTERN, c->vi.ubi_num, c->vi.vol_id);
 	if (!c->ro_mount) {
 		/* Create background thread */
-		c->bgt = kthread_create(ubifs_bg_thread, c, "%s", c->bgt_name);
+		c->bgt = kthread_run(ubifs_bg_thread, c, "%s", c->bgt_name);
 		if (IS_ERR(c->bgt)) {
 			err = PTR_ERR(c->bgt);
 			c->bgt = NULL;
@@ -1375,7 +1375,6 @@ static int mount_ubifs(struct ubifs_info *c)
 				  c->bgt_name, err);
 			goto out_wbufs;
 		}
-		wake_up_process(c->bgt);
 	}
 
 	err = ubifs_read_master(c);
@@ -1780,7 +1779,7 @@ static int ubifs_remount_rw(struct ubifs_info *c)
 		goto out;
 
 	/* Create background thread */
-	c->bgt = kthread_create(ubifs_bg_thread, c, "%s", c->bgt_name);
+	c->bgt = kthread_run(ubifs_bg_thread, c, "%s", c->bgt_name);
 	if (IS_ERR(c->bgt)) {
 		err = PTR_ERR(c->bgt);
 		c->bgt = NULL;
@@ -1788,7 +1787,6 @@ static int ubifs_remount_rw(struct ubifs_info *c)
 			  c->bgt_name, err);
 		goto out;
 	}
-	wake_up_process(c->bgt);
 
 	c->orph_buf = vmalloc(c->leb_size);
 	if (!c->orph_buf) {