From 8ffb929098a56939ac71509302eeab5b207bf262 Mon Sep 17 00:00:00 2001 From: Gustavo Padovan Date: Mon, 21 Oct 2013 14:21:41 -0200 Subject: Bluetooth: Remove parent socket usage from l2cap_core.c The parent socket is not used inside the L2CAP core anymore. We only lock it to indirect access through the new_connection() callback. The hold of the socket lock was moved to the new_connection() callback. Inside L2CAP core the channel lock is now used in l2cap_le_conn_ready() and l2cap_conn_ready() to protect the execution of these two functions during the handling of new incoming connections. This change remove the socket lock usage from L2CAP core while keeping the code safe against race conditions. Signed-off-by: Gustavo Padovan Signed-off-by: Marcel Holtmann --- net/bluetooth/l2cap_core.c | 14 ++++---------- net/bluetooth/l2cap_sock.c | 4 ++++ 2 files changed, 8 insertions(+), 10 deletions(-) (limited to 'net/bluetooth') diff --git a/net/bluetooth/l2cap_core.c b/net/bluetooth/l2cap_core.c index c65ddc8e7689..bb6d35e6b832 100644 --- a/net/bluetooth/l2cap_core.c +++ b/net/bluetooth/l2cap_core.c @@ -1362,7 +1362,6 @@ static struct l2cap_chan *l2cap_global_chan_by_scid(int state, u16 cid, static void l2cap_le_conn_ready(struct l2cap_conn *conn) { struct hci_conn *hcon = conn->hcon; - struct sock *parent; struct l2cap_chan *chan, *pchan; u8 dst_type; @@ -1384,9 +1383,7 @@ static void l2cap_le_conn_ready(struct l2cap_conn *conn) if (hci_blacklist_lookup(hcon->hdev, &hcon->dst, dst_type)) return; - parent = pchan->sk; - - lock_sock(parent); + l2cap_chan_lock(pchan); chan = pchan->ops->new_connection(pchan); if (!chan) @@ -1402,7 +1399,7 @@ static void l2cap_le_conn_ready(struct l2cap_conn *conn) __l2cap_chan_add(conn, chan); clean: - release_sock(parent); + l2cap_chan_unlock(pchan); } static void l2cap_conn_ready(struct l2cap_conn *conn) @@ -3705,7 +3702,6 @@ static struct l2cap_chan *l2cap_connect(struct l2cap_conn *conn, struct l2cap_conn_req *req = (struct l2cap_conn_req *) data; struct l2cap_conn_rsp rsp; struct l2cap_chan *chan = NULL, *pchan; - struct sock *parent; int result, status = L2CAP_CS_NO_INFO; u16 dcid = 0, scid = __le16_to_cpu(req->scid); @@ -3721,10 +3717,8 @@ static struct l2cap_chan *l2cap_connect(struct l2cap_conn *conn, goto sendresp; } - parent = pchan->sk; - mutex_lock(&conn->chan_lock); - lock_sock(parent); + l2cap_chan_lock(pchan); /* Check if the ACL is secure enough (if not SDP) */ if (psm != __constant_cpu_to_le16(L2CAP_PSM_SDP) && @@ -3800,7 +3794,7 @@ static struct l2cap_chan *l2cap_connect(struct l2cap_conn *conn, } response: - release_sock(parent); + l2cap_chan_unlock(pchan); mutex_unlock(&conn->chan_lock); sendresp: diff --git a/net/bluetooth/l2cap_sock.c b/net/bluetooth/l2cap_sock.c index e55999228c8a..a159b0e05202 100644 --- a/net/bluetooth/l2cap_sock.c +++ b/net/bluetooth/l2cap_sock.c @@ -1042,6 +1042,8 @@ static struct l2cap_chan *l2cap_sock_new_connection_cb(struct l2cap_chan *chan) { struct sock *sk, *parent = chan->data; + lock_sock(parent); + /* Check for backlog size */ if (sk_acceptq_is_full(parent)) { BT_DBG("backlog full %d", parent->sk_ack_backlog); @@ -1059,6 +1061,8 @@ static struct l2cap_chan *l2cap_sock_new_connection_cb(struct l2cap_chan *chan) bt_accept_enqueue(parent, sk); + release_sock(parent); + return l2cap_pi(sk)->chan; } -- cgit v1.2.3