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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:
	dfb2fae 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: Jeffy Chen <jeffy.chen@rock-chips.com>
Reviewed-by: Brian Norris <briannorris@chromium.org>
Reviewed-by: AL Yu-Chen Cho <acho@suse.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Jeffy Chen 2017-06-27 17:34:42 +08:00 committed by Marcel Holtmann
parent cdd24a200a
commit 25717382c1
1 changed files with 5 additions and 6 deletions
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11
net/bluetooth/bnep/core.c
View File

@ -481,16 +481,16 @@ static int bnep_session(void *arg)
struct net_device *dev = s->dev;
struct sock *sk = s->sock->sk;
struct sk_buff *skb;
wait_queue_t wait;
DEFINE_WAIT_FUNC(wait, woken_wake_function);
BT_DBG("");
set_user_nice(current, -15);
init_waitqueue_entry(&wait, current);
add_wait_queue(sk_sleep(sk), &wait);
while (1) {
set_current_state(TASK_INTERRUPTIBLE);
/* Ensure session->terminate is updated */
smp_mb__before_atomic();
if (atomic_read(&s->terminate))
break;
@ -512,9 +512,8 @@ static int bnep_session(void *arg)
break;
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);
/* Cleanup session */
@ -663,7 +662,7 @@ int bnep_del_connection(struct bnep_conndel_req *req)
s = __bnep_get_session(req->dst);
if (s) {
atomic_inc(&s->terminate);
wake_up_process(s->task);
wake_up_interruptible(sk_sleep(s->sock->sk));
} else
err = -ENOENT;