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Bluetooth: Revert to mutexes from RCU list

Browse Source 
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 2012-02-21 12:54:55 +02:00 committed by Johan Hedberg
parent 1b009c9824
commit 3df91ea20e
2 changed files with 109 additions and 67 deletions
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166
net/bluetooth/l2cap_core.c
View File

@ -77,36 +77,24 @@ static void l2cap_send_disconn_req(struct l2cap_conn *conn,
static struct l2cap_chan *__l2cap_get_chan_by_dcid(struct l2cap_conn *conn, u16 cid)
{
struct l2cap_chan *c, *r = NULL;
struct l2cap_chan *c;
rcu_read_lock();
list_for_each_entry_rcu(c, &conn->chan_l, list) {
if (c->dcid == cid) {
r = c;
break;
}
list_for_each_entry(c, &conn->chan_l, list) {
if (c->dcid == cid)
return c;
}
rcu_read_unlock();
return r;
return NULL;
}
static struct l2cap_chan *__l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 cid)
{
struct l2cap_chan *c, *r = NULL;
struct l2cap_chan *c;
rcu_read_lock();
list_for_each_entry_rcu(c, &conn->chan_l, list) {
if (c->scid == cid) {
r = c;
break;
}
list_for_each_entry(c, &conn->chan_l, list) {
if (c->scid == cid)
return c;
}
rcu_read_unlock();
return r;
return NULL;
}
/* Find channel with given SCID.
@ -115,36 +103,32 @@ static struct l2cap_chan *l2cap_get_chan_by_scid(struct l2cap_conn *conn, u16 ci
{
struct l2cap_chan *c;
mutex_lock(&conn->chan_lock);
c = __l2cap_get_chan_by_scid(conn, cid);
if (c)
lock_sock(c->sk);
mutex_unlock(&conn->chan_lock);
return c;
}
static struct l2cap_chan *__l2cap_get_chan_by_ident(struct l2cap_conn *conn, u8 ident)
{
struct l2cap_chan *c, *r = NULL;
struct l2cap_chan *c;
rcu_read_lock();
list_for_each_entry_rcu(c, &conn->chan_l, list) {
if (c->ident == ident) {
r = c;
break;
}
list_for_each_entry(c, &conn->chan_l, list) {
if (c->ident == ident)
return c;
}
rcu_read_unlock();
return r;
return NULL;
}
static inline struct l2cap_chan *l2cap_get_chan_by_ident(struct l2cap_conn *conn, u8 ident)
{
struct l2cap_chan *c;
mutex_lock(&conn->chan_lock);
c = __l2cap_get_chan_by_ident(conn, ident);
if (c)
lock_sock(c->sk);
mutex_unlock(&conn->chan_lock);
return c;
}
@ -228,11 +212,13 @@ static void l2cap_chan_timeout(struct work_struct *work)
{
struct l2cap_chan *chan = container_of(work, struct l2cap_chan,
chan_timer.work);
struct l2cap_conn *conn = chan->conn;
struct sock *sk = chan->sk;
int reason;
BT_DBG("chan %p state %s", chan, state_to_string(chan->state));
mutex_lock(&conn->chan_lock);
lock_sock(sk);
if (chan->state == BT_CONNECTED || chan->state == BT_CONFIG)
@ -248,6 +234,8 @@ static void l2cap_chan_timeout(struct work_struct *work)
release_sock(sk);
chan->ops->close(chan->data);
mutex_unlock(&conn->chan_lock);
l2cap_chan_put(chan);
}
@ -331,7 +319,9 @@ static void l2cap_chan_add(struct l2cap_conn *conn, struct l2cap_chan *chan)
l2cap_chan_hold(chan);
list_add_rcu(&chan->list, &conn->chan_l);
mutex_lock(&conn->chan_lock);
list_add(&chan->list, &conn->chan_l);
mutex_unlock(&conn->chan_lock);
}
/* Delete channel.
@ -348,8 +338,7 @@ static void l2cap_chan_del(struct l2cap_chan *chan, int err)
if (conn) {
/* Delete from channel list */
list_del_rcu(&chan->list);
synchronize_rcu();
list_del(&chan->list);
l2cap_chan_put(chan);
@ -400,10 +389,12 @@ static void l2cap_chan_cleanup_listen(struct sock *parent)
/* Close not yet accepted channels */
while ((sk = bt_accept_dequeue(parent, NULL))) {
struct l2cap_chan *chan = l2cap_pi(sk)->chan;
__clear_chan_timer(chan);
lock_sock(sk);
l2cap_chan_close(chan, ECONNRESET);
release_sock(sk);
chan->ops->close(chan->data);
}
}
@ -718,13 +709,13 @@ static void l2cap_send_disconn_req(struct l2cap_conn *conn, struct l2cap_chan *c
/* ---- L2CAP connections ---- */
static void l2cap_conn_start(struct l2cap_conn *conn)
{
struct l2cap_chan *chan;
struct l2cap_chan *chan, *tmp;
BT_DBG("conn %p", conn);
rcu_read_lock();
mutex_lock(&conn->chan_lock);
list_for_each_entry_rcu(chan, &conn->chan_l, list) {
list_for_each_entry_safe(chan, tmp, &conn->chan_l, list) {
struct sock *sk = chan->sk;
bh_lock_sock(sk);
@ -804,7 +795,7 @@ static void l2cap_conn_start(struct l2cap_conn *conn)
bh_unlock_sock(sk);
}
rcu_read_unlock();
mutex_unlock(&conn->chan_lock);
}
/* Find socket with cid and source bdaddr.
@ -916,9 +907,9 @@ static void l2cap_conn_ready(struct l2cap_conn *conn)
if (conn->hcon->out && conn->hcon->type == LE_LINK)
smp_conn_security(conn, conn->hcon->pending_sec_level);
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;
bh_lock_sock(sk);
@ -938,7 +929,7 @@ static void l2cap_conn_ready(struct l2cap_conn *conn)
bh_unlock_sock(sk);
}
rcu_read_unlock();
mutex_unlock(&conn->chan_lock);
}
/* Notify sockets that we cannot guaranty reliability anymore */
@ -948,16 +939,16 @@ static void l2cap_conn_unreliable(struct l2cap_conn *conn, int err)
BT_DBG("conn %p", conn);
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;
if (test_bit(FLAG_FORCE_RELIABLE, &chan->flags))
sk->sk_err = err;
}
rcu_read_unlock();
mutex_unlock(&conn->chan_lock);
}
static void l2cap_info_timeout(struct work_struct *work)
@ -984,6 +975,8 @@ static void l2cap_conn_del(struct hci_conn *hcon, int err)
kfree_skb(conn->rx_skb);
mutex_lock(&conn->chan_lock);
/* Kill channels */
list_for_each_entry_safe(chan, l, &conn->chan_l, list) {
sk = chan->sk;
@ -993,6 +986,8 @@ static void l2cap_conn_del(struct hci_conn *hcon, int err)
chan->ops->close(chan->data);
}
mutex_unlock(&conn->chan_lock);
hci_chan_del(conn->hchan);
if (conn->info_state & L2CAP_INFO_FEAT_MASK_REQ_SENT)
@ -1050,6 +1045,7 @@ static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status)
conn->feat_mask = 0;
spin_lock_init(&conn->lock);
mutex_init(&conn->chan_lock);
INIT_LIST_HEAD(&conn->chan_l);
@ -1792,9 +1788,9 @@ static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb)
BT_DBG("conn %p", conn);
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;
if (chan->chan_type != L2CAP_CHAN_RAW)
continue;
@ -1810,7 +1806,7 @@ static void l2cap_raw_recv(struct l2cap_conn *conn, struct sk_buff *skb)
kfree_skb(nskb);
}
rcu_read_unlock();
mutex_unlock(&conn->chan_lock);
}
/* ---- L2CAP signalling commands ---- */
@ -2600,6 +2596,7 @@ static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hd
parent = pchan->sk;
mutex_lock(&conn->chan_lock);
lock_sock(parent);
/* Check if the ACL is secure enough (if not SDP) */
@ -2673,6 +2670,7 @@ static inline int l2cap_connect_req(struct l2cap_conn *conn, struct l2cap_cmd_hd
response:
release_sock(parent);
mutex_unlock(&conn->chan_lock);
sendresp:
rsp.scid = cpu_to_le16(scid);
@ -2714,6 +2712,7 @@ static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hd
struct l2cap_chan *chan;
struct sock *sk;
u8 req[128];
int err;
scid = __le16_to_cpu(rsp->scid);
dcid = __le16_to_cpu(rsp->dcid);
@ -2723,17 +2722,26 @@ static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hd
BT_DBG("dcid 0x%4.4x scid 0x%4.4x result 0x%2.2x status 0x%2.2x",
dcid, scid, result, status);
mutex_lock(&conn->chan_lock);
if (scid) {
chan = l2cap_get_chan_by_scid(conn, scid);
if (!chan)
return -EFAULT;
chan = __l2cap_get_chan_by_scid(conn, scid);
if (!chan) {
err = -EFAULT;
goto unlock;
}
} else {
chan = l2cap_get_chan_by_ident(conn, cmd->ident);
if (!chan)
return -EFAULT;
chan = __l2cap_get_chan_by_ident(conn, cmd->ident);
if (!chan) {
err = -EFAULT;
goto unlock;
}
}
err = 0;
sk = chan->sk;
lock_sock(sk);
switch (result) {
case L2CAP_CR_SUCCESS:
@ -2760,7 +2768,11 @@ static inline int l2cap_connect_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hd
}
release_sock(sk);
return 0;
unlock:
mutex_unlock(&conn->chan_lock);
return err;
}
static inline void set_default_fcs(struct l2cap_chan *chan)
@ -2793,6 +2805,7 @@ static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr
return -ENOENT;
sk = chan->sk;
lock_sock(sk);
if (chan->state != BT_CONFIG && chan->state != BT_CONNECT2) {
struct l2cap_cmd_rej_cid rej;
@ -2905,6 +2918,7 @@ static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr
return 0;
sk = chan->sk;
lock_sock(sk);
switch (result) {
case L2CAP_CONF_SUCCESS:
@ -3006,11 +3020,16 @@ static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd
BT_DBG("scid 0x%4.4x dcid 0x%4.4x", scid, dcid);
chan = l2cap_get_chan_by_scid(conn, dcid);
if (!chan)
mutex_lock(&conn->chan_lock);
chan = __l2cap_get_chan_by_scid(conn, dcid);
if (!chan) {
mutex_unlock(&conn->chan_lock);
return 0;
}
sk = chan->sk;
lock_sock(sk);
rsp.dcid = cpu_to_le16(chan->scid);
rsp.scid = cpu_to_le16(chan->dcid);
@ -3022,6 +3041,9 @@ static inline int l2cap_disconnect_req(struct l2cap_conn *conn, struct l2cap_cmd
release_sock(sk);
chan->ops->close(chan->data);
mutex_unlock(&conn->chan_lock);
return 0;
}
@ -3037,16 +3059,24 @@ static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn, struct l2cap_cmd
BT_DBG("dcid 0x%4.4x scid 0x%4.4x", dcid, scid);
chan = l2cap_get_chan_by_scid(conn, scid);
if (!chan)
mutex_lock(&conn->chan_lock);
chan = __l2cap_get_chan_by_scid(conn, scid);
if (!chan) {
mutex_unlock(&conn->chan_lock);
return 0;
}
sk = chan->sk;
lock_sock(sk);
l2cap_chan_del(chan, 0);
release_sock(sk);
chan->ops->close(chan->data);
mutex_unlock(&conn->chan_lock);
return 0;
}
@ -4205,6 +4235,7 @@ static inline int l2cap_data_channel(struct l2cap_conn *conn, u16 cid, struct sk
}
sk = chan->sk;
lock_sock(sk);
BT_DBG("chan %p, len %d", chan, skb->len);
@ -4492,9 +4523,9 @@ int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt)
cancel_delayed_work(&conn->security_timer);
}
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;
bh_lock_sock(sk);
@ -4574,7 +4605,7 @@ int l2cap_security_cfm(struct hci_conn *hcon, u8 status, u8 encrypt)
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, "

10
net/bluetooth/l2cap_sock.c
View File

@ -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;
}