Bluetooth: cmtp: Fix lost wakeup of session thread

Fix race condition which can result in missing the wakeup intended
to stop the session thread.
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>

net/bluetooth/cmtp/core.c

@@ -292,9 +292,11 @@ static int cmtp_session(void *arg)
 
 	init_waitqueue_entry(&wait, current);
 	add_wait_queue(sk_sleep(sk), &wait);
-	while (!kthread_should_stop()) {
+	while (1) {
 		set_current_state(TASK_INTERRUPTIBLE);
 
+		if (kthread_should_stop())
+			break;
 		if (sk->sk_state != BT_CONNECTED)
 			break;
 
@@ -307,7 +309,7 @@ static int cmtp_session(void *arg)
 
 		schedule();
 	}
-	set_current_state(TASK_RUNNING);
+	__set_current_state(TASK_RUNNING);
 	remove_wait_queue(sk_sleep(sk), &wait);
 
 	down_write(&cmtp_session_sem);