Bluetooth: bnep: Fix deadlock in session deletion

Commit f4d7cd4a4c introduced the usage of kthread API.
kthread_stop is a blocking function which returns only when
the thread exits. In this case, the thread can't exit because it's
waiting for the write lock, which is being held by bnep_del_connection()
which is waiting for the thread to exit -- deadlock.

Use atomic_t/wake_up_process instead to signal to the thread to exit.

Signed-off-by: Jaikumar Ganesh <[e-mail]>
Signed-off-by: Peter Hurley <[e-mail]>
Signed-off-by: Gustavo F. Padovan <[e-mail]>

net/bluetooth/bnep/bnep.h

···
 	unsigned int  role;
 	unsigned long state;
 	unsigned long flags;
+	atomic_t      terminate;
 	struct task_struct *task;
 
 	struct ethhdr eh;

net/bluetooth/bnep/core.c

···
 	while (1) {
 		set_current_state(TASK_INTERRUPTIBLE);
 
-		if (kthread_should_stop())
+		if (atomic_read(&s->terminate))
 			break;
 		/* RX */
 		while ((skb = skb_dequeue(&sk->sk_receive_queue))) {
···
 	down_read(&bnep_session_sem);
 
 	s = __bnep_get_session(req->dst);
-	if (s)
-		kthread_stop(s->task);
-	else
+	if (s) {
+		atomic_inc(&s->terminate);
+		wake_up_process(s->task);
+	} else
 		err = -ENOENT;
 
 	up_read(&bnep_session_sem);