Commit 25717382 authored by Jeffy Chen's avatar Jeffy Chen Committed by Marcel Holtmann

Bluetooth: bnep: fix possible might sleep error in bnep_session

It looks like bnep_session has same pattern as the issue reported in
old rfcomm:

	while (1) {
		set_current_state(TASK_INTERRUPTIBLE);
		if (condition)
			break;
		// may call might_sleep here
		schedule();
	}
	__set_current_state(TASK_RUNNING);

Which fixed at:
	dfb2fae7 Bluetooth: Fix nested sleeps

So let's fix it at the same way, also follow the suggestion of:
https://lwn.net/Articles/628628/Signed-off-by: default avatarJeffy Chen <jeffy.chen@rock-chips.com>
Reviewed-by: default avatarBrian Norris <briannorris@chromium.org>
Reviewed-by: default avatarAL Yu-Chen Cho <acho@suse.com>
Signed-off-by: default avatarMarcel Holtmann <marcel@holtmann.org>
parent cdd24a20
...@@ -481,16 +481,16 @@ static int bnep_session(void *arg) ...@@ -481,16 +481,16 @@ static int bnep_session(void *arg)
struct net_device *dev = s->dev; struct net_device *dev = s->dev;
struct sock *sk = s->sock->sk; struct sock *sk = s->sock->sk;
struct sk_buff *skb; struct sk_buff *skb;
wait_queue_t wait; DEFINE_WAIT_FUNC(wait, woken_wake_function);
BT_DBG(""); BT_DBG("");
set_user_nice(current, -15); set_user_nice(current, -15);
init_waitqueue_entry(&wait, current);
add_wait_queue(sk_sleep(sk), &wait); add_wait_queue(sk_sleep(sk), &wait);
while (1) { while (1) {
set_current_state(TASK_INTERRUPTIBLE); /* Ensure session->terminate is updated */
smp_mb__before_atomic();
if (atomic_read(&s->terminate)) if (atomic_read(&s->terminate))
break; break;
...@@ -512,9 +512,8 @@ static int bnep_session(void *arg) ...@@ -512,9 +512,8 @@ static int bnep_session(void *arg)
break; break;
netif_wake_queue(dev); netif_wake_queue(dev);
schedule(); wait_woken(&wait, TASK_INTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT);
} }
__set_current_state(TASK_RUNNING);
remove_wait_queue(sk_sleep(sk), &wait); remove_wait_queue(sk_sleep(sk), &wait);
/* Cleanup session */ /* Cleanup session */
...@@ -663,7 +662,7 @@ int bnep_del_connection(struct bnep_conndel_req *req) ...@@ -663,7 +662,7 @@ int bnep_del_connection(struct bnep_conndel_req *req)
s = __bnep_get_session(req->dst); s = __bnep_get_session(req->dst);
if (s) { if (s) {
atomic_inc(&s->terminate); atomic_inc(&s->terminate);
wake_up_process(s->task); wake_up_interruptible(sk_sleep(s->sock->sk));
} else } else
err = -ENOENT; err = -ENOENT;
......
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