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Commit 71ba0e56 authored by Gustavo Padovan's avatar Gustavo Padovan
Browse files

Bluetooth: Add refcnt to struct l2cap_chan 



struct l2cap_chan has now its own refcnt that is compatible with the
socket refcnt, i.e., we won't see sk_refcnt = 0 and chan->refcnt > 0.

Signed-off-by: default avatarGustavo F. Padovan <padovan@profusion.mobi>
parent 89bc500e

include/net/bluetooth/l2cap.h

+2 −0
Original line number Diff line number Diff line
@@ -289,6 +289,8 @@ struct l2cap_chan { 


	__u8		state;



	atomic_t	refcnt;



	__le16		psm;

	__u16		dcid;

	__u16		scid;

net/bluetooth/l2cap_core.c

+21 −9
Original line number Diff line number Diff line
@@ -78,6 +78,18 @@ static void l2cap_send_disconn_req(struct l2cap_conn *conn, 
static int l2cap_ertm_data_rcv(struct sock *sk, struct sk_buff *skb);



/* ---- L2CAP channels ---- */



static inline void chan_hold(struct l2cap_chan *c)

{

	atomic_inc(&c->refcnt);

}



static inline void chan_put(struct l2cap_chan *c)

{

	if (atomic_dec_and_test(&c->refcnt))

		kfree(c);

}



static struct l2cap_chan *__l2cap_get_chan_by_dcid(struct l2cap_conn *conn, u16 cid)

{

	struct l2cap_chan *c;
@@ -213,7 +225,7 @@ static void l2cap_chan_set_timer(struct l2cap_chan *chan, long timeout) 
       BT_DBG("chan %p state %d timeout %ld", chan->sk, chan->state, timeout);



       if (!mod_timer(&chan->chan_timer, jiffies + timeout))

	       sock_hold(chan->sk);

	       chan_hold(chan);

}



static void l2cap_chan_clear_timer(struct l2cap_chan *chan)
@@ -221,7 +233,7 @@ static void l2cap_chan_clear_timer(struct l2cap_chan *chan) 
       BT_DBG("chan %p state %d", chan, chan->state);



       if (timer_pending(&chan->chan_timer) && del_timer(&chan->chan_timer))

	       __sock_put(chan->sk);

	       chan_put(chan);

}



static void l2cap_state_change(struct l2cap_chan *chan, int state)
@@ -244,7 +256,7 @@ static void l2cap_chan_timeout(unsigned long arg) 
		/* sk is owned by user. Try again later */

		l2cap_chan_set_timer(chan, HZ / 5);

		bh_unlock_sock(sk);

		sock_put(sk);

		chan_put(chan);

		return;

	}
@@ -261,7 +273,7 @@ static void l2cap_chan_timeout(unsigned long arg) 
	bh_unlock_sock(sk);



	chan->ops->close(chan->data);

	sock_put(sk);

	chan_put(chan);

}



struct l2cap_chan *l2cap_chan_create(struct sock *sk)
@@ -282,6 +294,8 @@ struct l2cap_chan *l2cap_chan_create(struct sock *sk) 


	chan->state = BT_OPEN;



	atomic_set(&chan->refcnt, 1);



	return chan;

}
@@ -291,13 +305,11 @@ void l2cap_chan_destroy(struct l2cap_chan *chan) 
	list_del(&chan->global_l);

	write_unlock_bh(&chan_list_lock);



	kfree(chan);

	chan_put(chan);

}



static void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan)

{

	struct sock *sk = chan->sk;



	BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn,

			chan->psm, chan->dcid);
@@ -328,7 +340,7 @@ static void __l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan) 
		chan->omtu = L2CAP_DEFAULT_MTU;

	}



	sock_hold(sk);

	chan_hold(chan);



	list_add(&chan->list, &conn->chan_l);

}
@@ -350,7 +362,7 @@ static void l2cap_chan_del(struct l2cap_chan *chan, int err) 
		write_lock_bh(&conn->chan_lock);

		list_del(&chan->list);

		write_unlock_bh(&conn->chan_lock);

		__sock_put(sk);

		chan_put(chan);



		chan->conn = NULL;

		hci_conn_put(conn->hcon);