diff options
| author | Jeffy Chen <jeffy.chen@rock-chips.com> | 2017-06-27 17:34:42 +0800 |
|---|---|---|
| committer | Marcel Holtmann <marcel@holtmann.org> | 2017-06-27 19:32:11 +0200 |
| commit | 25717382c1dd0ddced2059053e3ca5088665f7a5 (patch) | |
| tree | ffe5af4a8f3d9b254f0575dd57eae84a78f46fb7 /net/bluetooth | |
| parent | cdd24a200a8fa39e383890bbf862c0aa83ba83f5 (diff) | |
| download | lwn-25717382c1dd0ddced2059053e3ca5088665f7a5.tar.gz lwn-25717382c1dd0ddced2059053e3ca5088665f7a5.zip | |
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>
Diffstat (limited to 'net/bluetooth')
| -rw-r--r-- | net/bluetooth/bnep/core.c | 11 |
1 files changed, 5 insertions, 6 deletions
diff --git a/net/bluetooth/bnep/core.c b/net/bluetooth/bnep/core.c index 9a40013da915..7b3965861013 100644 --- a/net/bluetooth/bnep/core.c +++ b/net/bluetooth/bnep/core.c @@ -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; |