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Bluetooth: switch to lock_sock in RFCOMM 

Other than rfcomm_sk_state_change and rfcomm_connect_ind, functions in
RFCOMM use lock_sock to lock the socket.

Since bh_lock_sock and spin_lock_bh do not provide synchronization
with lock_sock, these calls should be changed to lock_sock.

This is now safe to do because packet processing is now done in a
workqueue instead of a tasklet, so bh_lock_sock/spin_lock_bh are no
longer necessary to synchronise between user contexts and SOFTIRQ
processing.

Signed-off-by: Desmond Cheong Zhi Xi <desmondcheongzx@gmail.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
This commit is contained in:
Desmond Cheong Zhi Xi 2021-08-10 12:14:09 +08:00 committed by Luiz Augusto von Dentz
parent 3f2c89fb46
commit b7ce436a5d
1 changed files with 4 additions and 4 deletions
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8
net/bluetooth/rfcomm/sock.c
View File

@ -70,7 +70,7 @@ static void rfcomm_sk_state_change(struct rfcomm_dlc *d, int err)
BT_DBG("dlc %p state %ld err %d", d, d->state, err);
spin_lock_bh(&sk->sk_lock.slock);
lock_sock(sk);
if (err)
sk->sk_err = err;
@ -91,7 +91,7 @@ static void rfcomm_sk_state_change(struct rfcomm_dlc *d, int err)
sk->sk_state_change(sk);
}
spin_unlock_bh(&sk->sk_lock.slock);
release_sock(sk);
if (parent && sock_flag(sk, SOCK_ZAPPED)) {
/* We have to drop DLC lock here, otherwise
@ -974,7 +974,7 @@ int rfcomm_connect_ind(struct rfcomm_session *s, u8 channel, struct rfcomm_dlc *
if (!parent)
return 0;
bh_lock_sock(parent);
lock_sock(parent);
/* Check for backlog size */
if (sk_acceptq_is_full(parent)) {
@ -1001,7 +1001,7 @@ int rfcomm_connect_ind(struct rfcomm_session *s, u8 channel, struct rfcomm_dlc *
result = 1;
done:
bh_unlock_sock(parent);
release_sock(parent);
if (test_bit(BT_SK_DEFER_SETUP, &bt_sk(parent)->flags))
parent->sk_state_change(parent);