Bluetooth: silence lockdep warning
Since bluetooth uses multiple protocols types, to avoid lockdep
warnings, we need to use different lockdep classes (one for each
protocol type).
This is already done in bt_sock_create but it misses a couple of cases
when new connections are created. This patch corrects that to fix the
following warning:
<4>[ 1864.732366] =======================================================
<4>[ 1864.733030] [ INFO: possible circular locking dependency detected ]
<4>[ 1864.733544] 3.0.16-mid3-00007-gc9a0f62 #3
<4>[ 1864.733883] -------------------------------------------------------
<4>[ 1864.734408] t.android.btclc/4204 is trying to acquire lock:
<4>[ 1864.734869] (rfcomm_mutex){+.+.+.}, at: [<c14970ea>] rfcomm_dlc_close+0x15/0x30
<4>[ 1864.735541]
<4>[ 1864.735549] but task is already holding lock:
<4>[ 1864.736045] (sk_lock-AF_BLUETOOTH){+.+.+.}, at: [<c1498bf7>] lock_sock+0xa/0xc
<4>[ 1864.736732]
<4>[ 1864.736740] which lock already depends on the new lock.
<4>[ 1864.736750]
<4>[ 1864.737428]
<4>[ 1864.737437] the existing dependency chain (in reverse order) is:
<4>[ 1864.738016]
<4>[ 1864.738023] -> #1 (sk_lock-AF_BLUETOOTH){+.+.+.}:
<4>[ 1864.738549] [<c1062273>] lock_acquire+0x104/0x140
<4>[ 1864.738977] [<c13d35c1>] lock_sock_nested+0x58/0x68
<4>[ 1864.739411] [<c1493c33>] l2cap_sock_sendmsg+0x3e/0x76
<4>[ 1864.739858] [<c13d06c3>] __sock_sendmsg+0x50/0x59
<4>[ 1864.740279] [<c13d0ea2>] sock_sendmsg+0x94/0xa8
<4>[ 1864.740687] [<c13d0ede>] kernel_sendmsg+0x28/0x37
<4>[ 1864.741106] [<c14969ca>] rfcomm_send_frame+0x30/0x38
<4>[ 1864.741542] [<c1496a2a>] rfcomm_send_ua+0x58/0x5a
<4>[ 1864.741959] [<c1498447>] rfcomm_run+0x441/0xb52
<4>[ 1864.742365] [<c104f095>] kthread+0x63/0x68
<4>[ 1864.742742] [<c14d5182>] kernel_thread_helper+0x6/0xd
<4>[ 1864.743187]
<4>[ 1864.743193] -> #0 (rfcomm_mutex){+.+.+.}:
<4>[ 1864.743667] [<c1061ada>] __lock_acquire+0x988/0xc00
<4>[ 1864.744100] [<c1062273>] lock_acquire+0x104/0x140
<4>[ 1864.744519] [<c14d2c70>] __mutex_lock_common+0x3b/0x33f
<4>[ 1864.744975] [<c14d303e>] mutex_lock_nested+0x2d/0x36
<4>[ 1864.745412] [<c14970ea>] rfcomm_dlc_close+0x15/0x30
<4>[ 1864.745842] [<c14990d9>] __rfcomm_sock_close+0x5f/0x6b
<4>[ 1864.746288] [<c1499114>] rfcomm_sock_shutdown+0x2f/0x62
<4>[ 1864.746737] [<c13d275d>] sys_socketcall+0x1db/0x422
<4>[ 1864.747165] [<c14d42f0>] syscall_call+0x7/0xb
Signed-off-by: Octavian Purdila <octavian.purdila@intel.com>
Acked-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
diff --git a/include/net/bluetooth/bluetooth.h b/include/net/bluetooth/bluetooth.h
index abaad6e..4a82ca0 100644
--- a/include/net/bluetooth/bluetooth.h
+++ b/include/net/bluetooth/bluetooth.h
@@ -256,4 +256,6 @@
int sco_init(void);
void sco_exit(void);
+void bt_sock_reclassify_lock(struct sock *sk, int proto);
+
#endif /* __BLUETOOTH_H */
diff --git a/net/bluetooth/af_bluetooth.c b/net/bluetooth/af_bluetooth.c
index ef92864..72eb187 100644
--- a/net/bluetooth/af_bluetooth.c
+++ b/net/bluetooth/af_bluetooth.c
@@ -71,19 +71,16 @@
"slock-AF_BLUETOOTH-BTPROTO_AVDTP",
};
-static inline void bt_sock_reclassify_lock(struct socket *sock, int proto)
+void bt_sock_reclassify_lock(struct sock *sk, int proto)
{
- struct sock *sk = sock->sk;
-
- if (!sk)
- return;
-
+ BUG_ON(!sk);
BUG_ON(sock_owned_by_user(sk));
sock_lock_init_class_and_name(sk,
bt_slock_key_strings[proto], &bt_slock_key[proto],
bt_key_strings[proto], &bt_lock_key[proto]);
}
+EXPORT_SYMBOL(bt_sock_reclassify_lock);
int bt_sock_register(int proto, const struct net_proto_family *ops)
{
@@ -145,7 +142,8 @@
if (bt_proto[proto] && try_module_get(bt_proto[proto]->owner)) {
err = bt_proto[proto]->create(net, sock, proto, kern);
- bt_sock_reclassify_lock(sock, proto);
+ if (!err)
+ bt_sock_reclassify_lock(sock->sk, proto);
module_put(bt_proto[proto]->owner);
}
diff --git a/net/bluetooth/l2cap_sock.c b/net/bluetooth/l2cap_sock.c
index c57027f..401d942 100644
--- a/net/bluetooth/l2cap_sock.c
+++ b/net/bluetooth/l2cap_sock.c
@@ -849,6 +849,8 @@
if (!sk)
return NULL;
+ bt_sock_reclassify_lock(sk, BTPROTO_L2CAP);
+
l2cap_sock_init(sk, parent);
return l2cap_pi(sk)->chan;
diff --git a/net/bluetooth/rfcomm/sock.c b/net/bluetooth/rfcomm/sock.c
index f066678..22169c3 100644
--- a/net/bluetooth/rfcomm/sock.c
+++ b/net/bluetooth/rfcomm/sock.c
@@ -956,6 +956,8 @@
if (!sk)
goto done;
+ bt_sock_reclassify_lock(sk, BTPROTO_RFCOMM);
+
rfcomm_sock_init(sk, parent);
bacpy(&bt_sk(sk)->src, &src);
bacpy(&bt_sk(sk)->dst, &dst);