Bluetooth: Revert to mutexes from RCU list
Usage of RCU list looks not reasonalbe for a number of reasons: our code sleep and we had to use socket spinlocks. Most parts of code are updaters thus there is little sense to use RCU. Signed-off-by: Andrei Emeltchenko <andrei.emeltchenko@intel.com> Reviewed-by: Ulisses Furquim <ulisses@profusion.mobi> Acked-by: Gustavo F. Padovan <padovan@profusion.mobi> Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
This commit is contained in:
Andrei Emeltchenko
Johan Hedberg
Родитель
1b009c9824
Коммит
3df91ea20e
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@ -77,36 +77,24 @@ static void l2cap_send_disconn_req(struct l2cap_conn *conn,
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static struct l2cap_chan *__l2cap_get_chan_by_dcid(struct l2cap_conn *conn, u16 cid)
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{
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struct l2cap_chan *c, *r = NULL;
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struct l2cap_chan *c;
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rcu_read_lock();
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list_for_each_entry_rcu(c, &conn->chan_l, list) {
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if (c->dcid == cid) {
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r = c;
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break;
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}
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list_for_each_entry(c, &conn->chan_l, list) {
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if (c->dcid == cid)
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return c;
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}
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rcu_read_unlock();
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return r;
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return NULL;
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}
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static struct l2cap_chan *__l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 cid)
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{
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struct l2cap_chan *c, *r = NULL;
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struct l2cap_chan *c;
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rcu_read_lock();
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list_for_each_entry_rcu(c, &conn->chan_l, list) {
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if (c->scid == cid) {
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r = c;
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break;
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}
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list_for_each_entry(c, &conn->chan_l, list) {
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if (c->scid == cid)
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return c;
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}
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rcu_read_unlock();
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return r;
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return NULL;
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}
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/* Find channel with given SCID.
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@ -115,36 +103,32 @@ static struct l2cap_chan *l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 ci
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{
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struct l2cap_chan *c;
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mutex_lock(&conn->chan_lock);
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c = __l2cap_get_chan_by_scid(conn, cid);
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if (c)
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lock_sock(c->sk);
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mutex_unlock(&conn->chan_lock);
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return c;
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}
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static struct l2cap_chan *__l2cap_get_chan_by_ident(struct l2cap_conn *conn, u8 ident)
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{
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struct l2cap_chan *c, *r = NULL;
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struct l2cap_chan *c;
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rcu_read_lock();
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list_for_each_entry_rcu(c, &conn->chan_l, list) {
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if (c->ident == ident) {
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r = c;
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break;
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}
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list_for_each_entry(c, &conn->chan_l, list) {
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if (c->ident == ident)
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return c;
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}
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rcu_read_unlock();
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return r;
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return NULL;
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}
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static inline struct l2cap_chan *l2cap_get_chan_by_ident(struct l2cap_conn *conn, u8 ident)
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{
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struct l2cap_chan *c;
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mutex_lock(&conn->chan_lock);
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c = __l2cap_get_chan_by_ident(conn, ident);
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if (c)
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lock_sock(c->sk);
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mutex_unlock(&conn->chan_lock);
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return c;
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}
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@ -228,11 +212,13 @@ static void l2cap_chan_timeout(struct work_struct *work)
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{
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struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
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chan_timer.work);
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struct l2cap_conn *conn = chan->conn;
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struct sock *sk = chan->sk;
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int reason;
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BT_DBG("chan %p state %s", chan, state_to_string(chan->state));
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mutex_lock(&conn->chan_lock);
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lock_sock(sk);
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if (chan->state == BT_CONNECTED || chan->state == BT_CONFIG)
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@ -248,6 +234,8 @@ static void l2cap_chan_timeout(struct work_struct *work)
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release_sock(sk);
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chan->ops->close(chan->data);
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mutex_unlock(&conn->chan_lock);
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l2cap_chan_put(chan);
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}
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@ -331,7 +319,9 @@ static void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan)
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l2cap_chan_hold(chan);
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list_add_rcu(&chan->list, &conn->chan_l);
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mutex_lock(&conn->chan_lock);
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list_add(&chan->list, &conn->chan_l);
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mutex_unlock(&conn->chan_lock);
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}
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/* Delete channel.
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@ -348,8 +338,7 @@ static void l2cap_chan_del(struct l2cap_chan *chan, int err)
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if (conn) {
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/* Delete from channel list */
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list_del_rcu(&chan->list);
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synchronize_rcu();
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list_del(&chan->list);
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l2cap_chan_put(chan);
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@ -400,10 +389,12 @@ static void l2cap_chan_cleanup_listen(struct sock *parent)
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/* Close not yet accepted channels */
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while ((sk = bt_accept_dequeue(parent, NULL))) {
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struct l2cap_chan *chan = l2cap_pi(sk)->chan;
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__clear_chan_timer(chan);
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lock_sock(sk);
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l2cap_chan_close(chan, ECONNRESET);
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release_sock(sk);
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chan->ops->close(chan->data);
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}
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}
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@ -718,13 +709,13 @@ static void l2cap_send_disconn_req(struct l2cap_conn *conn, struct l2cap_chan *c
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/* ---- L2CAP connections ---- */
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static void l2cap_conn_start(struct l2cap_conn *conn)
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{
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struct l2cap_chan *chan;
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struct l2cap_chan *chan, *tmp;
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BT_DBG("conn %p", conn);
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rcu_read_lock();
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mutex_lock(&conn->chan_lock);
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list_for_each_entry_rcu(chan, &conn->chan_l, list) {
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list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) {
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struct sock *sk = chan->sk;
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bh_lock_sock(sk);
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@ -804,7 +795,7 @@ static void l2cap_conn_start(struct l2cap_conn *conn)
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bh_unlock_sock(sk);
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}
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rcu_read_unlock();
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mutex_unlock(&conn->chan_lock);
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}
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/* Find socket with cid and source bdaddr.
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@ -916,9 +907,9 @@ static void l2cap_conn_ready(struct l2cap_conn *conn)
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if (conn->hcon->out && conn->hcon->type == LE_LINK)
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smp_conn_security(conn, conn->hcon->pending_sec_level);
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rcu_read_lock();
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mutex_lock(&conn->chan_lock);
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list_for_each_entry_rcu(chan, &conn->chan_l, list) {
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list_for_each_entry(chan, &conn->chan_l, list) {
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struct sock *sk = chan->sk;
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bh_lock_sock(sk);
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@ -938,7 +929,7 @@ static void l2cap_conn_ready(struct l2cap_conn *conn)
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bh_unlock_sock(sk);
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}
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rcu_read_unlock();
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mutex_unlock(&conn->chan_lock);
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}
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/* Notify sockets that we cannot guaranty reliability anymore */
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@ -948,16 +939,16 @@ static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err)
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BT_DBG("conn %p", conn);
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rcu_read_lock();
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mutex_lock(&conn->chan_lock);
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list_for_each_entry_rcu(chan, &conn->chan_l, list) {
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list_for_each_entry(chan, &conn->chan_l, list) {
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struct sock *sk = chan->sk;
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if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags))
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sk->sk_err = err;
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}
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rcu_read_unlock();
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mutex_unlock(&conn->chan_lock);
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}
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static void l2cap_info_timeout(struct work_struct *work)
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@ -984,6 +975,8 @@ static void l2cap_conn_del(struct hci_conn *hcon, int err)
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kfree_skb(conn->rx_skb);
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mutex_lock(&conn->chan_lock);
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/* Kill channels */
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list_for_each_entry_safe(chan, l, &conn->chan_l, list) {
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sk = chan->sk;
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@ -993,6 +986,8 @@ static void l2cap_conn_del(struct hci_conn *hcon, int err)
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chan->ops->close(chan->data);
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}
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mutex_unlock(&conn->chan_lock);
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hci_chan_del(conn->hchan);
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if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT)
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@ -1050,6 +1045,7 @@ static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status)
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conn->feat_mask = 0;
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spin_lock_init(&conn->lock);
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mutex_init(&conn->chan_lock);
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INIT_LIST_HEAD(&conn->chan_l);
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@ -1792,9 +1788,9 @@ static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb)
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BT_DBG("conn %p", conn);
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rcu_read_lock();
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mutex_lock(&conn->chan_lock);
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list_for_each_entry_rcu(chan, &conn->chan_l, list) {
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list_for_each_entry(chan, &conn->chan_l, list) {
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struct sock *sk = chan->sk;
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if (chan->chan_type != L2CAP_CHAN_RAW)
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continue;
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@ -1810,7 +1806,7 @@ static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb)
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kfree_skb(nskb);
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}
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rcu_read_unlock();
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mutex_unlock(&conn->chan_lock);
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}
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/* ---- L2CAP signalling commands ---- */
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@ -2600,6 +2596,7 @@ static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hd
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parent = pchan->sk;
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mutex_lock(&conn->chan_lock);
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lock_sock(parent);
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/* Check if the ACL is secure enough (if not SDP) */
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@ -2673,6 +2670,7 @@ static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hd
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response:
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release_sock(parent);
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mutex_unlock(&conn->chan_lock);
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sendresp:
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rsp.scid = cpu_to_le16(scid);
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@ -2714,6 +2712,7 @@ static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hd
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struct l2cap_chan *chan;
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struct sock *sk;
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u8 req[128];
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int err;
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scid = __le16_to_cpu(rsp->scid);
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dcid = __le16_to_cpu(rsp->dcid);
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@ -2723,17 +2722,26 @@ static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hd
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BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x",
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dcid, scid, result, status);
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mutex_lock(&conn->chan_lock);
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if (scid) {
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chan = l2cap_get_chan_by_scid(conn, scid);
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if (!chan)
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return -EFAULT;
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chan = __l2cap_get_chan_by_scid(conn, scid);
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if (!chan) {
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err = -EFAULT;
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goto unlock;
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}
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} else {
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chan = l2cap_get_chan_by_ident(conn, cmd->ident);
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if (!chan)
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return -EFAULT;
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chan = __l2cap_get_chan_by_ident(conn, cmd->ident);
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if (!chan) {
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err = -EFAULT;
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goto unlock;
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}
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}
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err = 0;
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sk = chan->sk;
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lock_sock(sk);
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switch (result) {
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case L2CAP_CR_SUCCESS:
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@ -2760,7 +2768,11 @@ static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hd
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}
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release_sock(sk);
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return 0;
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unlock:
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mutex_unlock(&conn->chan_lock);
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return err;
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}
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static inline void set_default_fcs(struct l2cap_chan *chan)
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@ -2793,6 +2805,7 @@ static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr
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return -ENOENT;
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sk = chan->sk;
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lock_sock(sk);
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if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2) {
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struct l2cap_cmd_rej_cid rej;
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@ -2905,6 +2918,7 @@ static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr
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return 0;
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sk = chan->sk;
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lock_sock(sk);
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switch (result) {
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case L2CAP_CONF_SUCCESS:
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@ -3006,11 +3020,16 @@ static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd
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BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid);
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chan = l2cap_get_chan_by_scid(conn, dcid);
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if (!chan)
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mutex_lock(&conn->chan_lock);
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chan = __l2cap_get_chan_by_scid(conn, dcid);
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if (!chan) {
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mutex_unlock(&conn->chan_lock);
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return 0;
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}
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sk = chan->sk;
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lock_sock(sk);
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rsp.dcid = cpu_to_le16(chan->scid);
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rsp.scid = cpu_to_le16(chan->dcid);
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@ -3022,6 +3041,9 @@ static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd
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release_sock(sk);
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chan->ops->close(chan->data);
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mutex_unlock(&conn->chan_lock);
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return 0;
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}
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@ -3037,16 +3059,24 @@ static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd
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BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid);
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chan = l2cap_get_chan_by_scid(conn, scid);
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if (!chan)
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mutex_lock(&conn->chan_lock);
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chan = __l2cap_get_chan_by_scid(conn, scid);
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if (!chan) {
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mutex_unlock(&conn->chan_lock);
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return 0;
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}
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sk = chan->sk;
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lock_sock(sk);
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|
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l2cap_chan_del(chan, 0);
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release_sock(sk);
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chan->ops->close(chan->data);
|
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|
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mutex_unlock(&conn->chan_lock);
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|
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return 0;
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}
|
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|
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|
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@ -4205,6 +4235,7 @@ static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk
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}
|
||||
|
||||
sk = chan->sk;
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lock_sock(sk);
|
||||
|
||||
BT_DBG("chan %p, len %d", chan, skb->len);
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|
||||
|
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@ -4492,9 +4523,9 @@ int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt)
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cancel_delayed_work(&conn->security_timer);
|
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}
|
||||
|
||||
rcu_read_lock();
|
||||
mutex_lock(&conn->chan_lock);
|
||||
|
||||
list_for_each_entry_rcu(chan, &conn->chan_l, list) {
|
||||
list_for_each_entry(chan, &conn->chan_l, list) {
|
||||
struct sock *sk = chan->sk;
|
||||
|
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bh_lock_sock(sk);
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|
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@ -4574,7 +4605,7 @@ int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt)
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bh_unlock_sock(sk);
|
||||
}
|
||||
|
||||
rcu_read_unlock();
|
||||
mutex_unlock(&conn->chan_lock);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
|
@ -4635,6 +4666,7 @@ int l2cap_recv_acldata(struct hci_conn *hcon, struct sk_buff *skb, u16 flags)
|
|||
|
||||
if (chan && chan->sk) {
|
||||
struct sock *sk = chan->sk;
|
||||
lock_sock(sk);
|
||||
|
||||
if (chan->imtu < len - L2CAP_HDR_SIZE) {
|
||||
BT_ERR("Frame exceeding recv MTU (len %d, "
|
||||
|
|
|
|||
|
|
@ -796,6 +796,7 @@ static int l2cap_sock_shutdown(struct socket *sock, int how)
|
|||
{
|
||||
struct sock *sk = sock->sk;
|
||||
struct l2cap_chan *chan;
|
||||
struct l2cap_conn *conn;
|
||||
int err = 0;
|
||||
|
||||
BT_DBG("sock %p, sk %p", sock, sk);
|
||||
|
|
@ -804,6 +805,10 @@ static int l2cap_sock_shutdown(struct socket *sock, int how)
|
|||
return 0;
|
||||
|
||||
chan = l2cap_pi(sk)->chan;
|
||||
conn = chan->conn;
|
||||
|
||||
if (conn)
|
||||
mutex_lock(&conn->chan_lock);
|
||||
|
||||
lock_sock(sk);
|
||||
if (!sk->sk_shutdown) {
|
||||
|
|
@ -811,6 +816,7 @@ static int l2cap_sock_shutdown(struct socket *sock, int how)
|
|||
err = __l2cap_wait_ack(sk);
|
||||
|
||||
sk->sk_shutdown = SHUTDOWN_MASK;
|
||||
|
||||
l2cap_chan_close(chan, 0);
|
||||
|
||||
if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime)
|
||||
|
|
@ -822,6 +828,10 @@ static int l2cap_sock_shutdown(struct socket *sock, int how)
|
|||
err = -sk->sk_err;
|
||||
|
||||
release_sock(sk);
|
||||
|
||||
if (conn)
|
||||
mutex_unlock(&conn->chan_lock);
|
||||
|
||||
return err;
|
||||
}
|
||||
|
||||
|
|
|
|||
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Ссылка в новой задаче