[PATCH v3 03/18] Bluetooth: rename hci_conn_put to hci_conn_drop

[David Herrmann <dh.herrmann@gmail.com>]

We use _get() and _put() for device ref-counting in the kernel. However,
hci_conn_put() is _not_ used for ref-counting, hence, rename it to
hci_conn_drop() so we can later fix ref-counting and introduce
hci_conn_put().

hci_conn_hold() and hci_conn_put() are currently used to manage how long a
connection should be held alive. When the last user drops the connection,
we spawn a delayed work that performs the disconnect. Obviously, this has
nothing to do with ref-counting for the _object_ but rather for the
keep-alive of the connection.

But we really _need_ proper ref-counting for the _object_ to allow
connection-users like rfcomm-tty, HIDP or others.

Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
---
 include/net/bluetooth/hci_core.h |  2 +-
 net/bluetooth/hci_conn.c         |  6 +++---
 net/bluetooth/hci_event.c        | 36 ++++++++++++++++++------------------
 net/bluetooth/l2cap_core.c       |  6 +++---
 net/bluetooth/mgmt.c             |  6 +++---
 net/bluetooth/sco.c              |  6 +++---
 net/bluetooth/smp.c              |  2 +-
 7 files changed, 32 insertions(+), 32 deletions(-)

diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
index 014a2ea..2fde836 100644
--- a/include/net/bluetooth/hci_core.h
+++ b/include/net/bluetooth/hci_core.h
@@ -605,7 +605,7 @@ static inline void hci_conn_hold(struct hci_conn *conn)
 	cancel_delayed_work(&conn->disc_work);
 }
 
-static inline void hci_conn_put(struct hci_conn *conn)
+static inline void hci_conn_drop(struct hci_conn *conn)
 {
 	BT_DBG("hcon %p orig refcnt %d", conn, atomic_read(&conn->refcnt));
 
diff --git a/net/bluetooth/hci_conn.c b/net/bluetooth/hci_conn.c
index 4925a02..319e7a4 100644
--- a/net/bluetooth/hci_conn.c
+++ b/net/bluetooth/hci_conn.c
@@ -433,7 +433,7 @@ int hci_conn_del(struct hci_conn *conn)
 		struct hci_conn *acl = conn->link;
 		if (acl) {
 			acl->link = NULL;
-			hci_conn_put(acl);
+			hci_conn_drop(acl);
 		}
 	}
 
@@ -565,7 +565,7 @@ static struct hci_conn *hci_connect_sco(struct hci_dev *hdev, int type,
 	if (!sco) {
 		sco = hci_conn_add(hdev, type, dst);
 		if (!sco) {
-			hci_conn_put(acl);
+			hci_conn_drop(acl);
 			return ERR_PTR(-ENOMEM);
 		}
 	}
@@ -980,7 +980,7 @@ void hci_chan_del(struct hci_chan *chan)
 
 	synchronize_rcu();
 
-	hci_conn_put(conn);
+	hci_conn_drop(conn);
 
 	skb_queue_purge(&chan->data_q);
 	kfree(chan);
diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
index 81b4448..11df1c4 100644
--- a/net/bluetooth/hci_event.c
+++ b/net/bluetooth/hci_event.c
@@ -1475,7 +1475,7 @@ static void hci_cs_auth_requested(struct hci_dev *hdev, __u8 status)
 	if (conn) {
 		if (conn->state == BT_CONFIG) {
 			hci_proto_connect_cfm(conn, status);
-			hci_conn_put(conn);
+			hci_conn_drop(conn);
 		}
 	}
 
@@ -1502,7 +1502,7 @@ static void hci_cs_set_conn_encrypt(struct hci_dev *hdev, __u8 status)
 	if (conn) {
 		if (conn->state == BT_CONFIG) {
 			hci_proto_connect_cfm(conn, status);
-			hci_conn_put(conn);
+			hci_conn_drop(conn);
 		}
 	}
 
@@ -1664,7 +1664,7 @@ static void hci_cs_read_remote_features(struct hci_dev *hdev, __u8 status)
 	if (conn) {
 		if (conn->state == BT_CONFIG) {
 			hci_proto_connect_cfm(conn, status);
-			hci_conn_put(conn);
+			hci_conn_drop(conn);
 		}
 	}
 
@@ -1691,7 +1691,7 @@ static void hci_cs_read_remote_ext_features(struct hci_dev *hdev, __u8 status)
 	if (conn) {
 		if (conn->state == BT_CONFIG) {
 			hci_proto_connect_cfm(conn, status);
-			hci_conn_put(conn);
+			hci_conn_drop(conn);
 		}
 	}
 
@@ -2154,7 +2154,7 @@ static void hci_conn_request_evt(struct hci_dev *hdev, struct sk_buff *skb)
 		} else {
 			conn->state = BT_CONNECT2;
 			hci_proto_connect_cfm(conn, 0);
-			hci_conn_put(conn);
+			hci_conn_drop(conn);
 		}
 	} else {
 		/* Connection rejected */
@@ -2261,14 +2261,14 @@ static void hci_auth_complete_evt(struct hci_dev *hdev, struct sk_buff *skb)
 		} else {
 			conn->state = BT_CONNECTED;
 			hci_proto_connect_cfm(conn, ev->status);
-			hci_conn_put(conn);
+			hci_conn_drop(conn);
 		}
 	} else {
 		hci_auth_cfm(conn, ev->status);
 
 		hci_conn_hold(conn);
 		conn->disc_timeout = HCI_DISCONN_TIMEOUT;
-		hci_conn_put(conn);
+		hci_conn_drop(conn);
 	}
 
 	if (test_bit(HCI_CONN_ENCRYPT_PEND, &conn->flags)) {
@@ -2352,7 +2352,7 @@ static void hci_encrypt_change_evt(struct hci_dev *hdev, struct sk_buff *skb)
 
 		if (ev->status && conn->state == BT_CONNECTED) {
 			hci_acl_disconn(conn, HCI_ERROR_AUTH_FAILURE);
-			hci_conn_put(conn);
+			hci_conn_drop(conn);
 			goto unlock;
 		}
 
@@ -2361,7 +2361,7 @@ static void hci_encrypt_change_evt(struct hci_dev *hdev, struct sk_buff *skb)
 				conn->state = BT_CONNECTED;
 
 			hci_proto_connect_cfm(conn, ev->status);
-			hci_conn_put(conn);
+			hci_conn_drop(conn);
 		} else
 			hci_encrypt_cfm(conn, ev->status, ev->encrypt);
 	}
@@ -2436,7 +2436,7 @@ static void hci_remote_features_evt(struct hci_dev *hdev,
 	if (!hci_outgoing_auth_needed(hdev, conn)) {
 		conn->state = BT_CONNECTED;
 		hci_proto_connect_cfm(conn, ev->status);
-		hci_conn_put(conn);
+		hci_conn_drop(conn);
 	}
 
 unlock:
@@ -2996,7 +2996,7 @@ static void hci_pin_code_request_evt(struct hci_dev *hdev, struct sk_buff *skb)
 	if (conn->state == BT_CONNECTED) {
 		hci_conn_hold(conn);
 		conn->disc_timeout = HCI_PAIRING_TIMEOUT;
-		hci_conn_put(conn);
+		hci_conn_drop(conn);
 	}
 
 	if (!test_bit(HCI_PAIRABLE, &hdev->dev_flags))
@@ -3099,7 +3099,7 @@ static void hci_link_key_notify_evt(struct hci_dev *hdev, struct sk_buff *skb)
 		if (ev->key_type != HCI_LK_CHANGED_COMBINATION)
 			conn->key_type = ev->key_type;
 
-		hci_conn_put(conn);
+		hci_conn_drop(conn);
 	}
 
 	if (test_bit(HCI_LINK_KEYS, &hdev->dev_flags))
@@ -3268,7 +3268,7 @@ static void hci_remote_ext_features_evt(struct hci_dev *hdev,
 	if (!hci_outgoing_auth_needed(hdev, conn)) {
 		conn->state = BT_CONNECTED;
 		hci_proto_connect_cfm(conn, ev->status);
-		hci_conn_put(conn);
+		hci_conn_drop(conn);
 	}
 
 unlock:
@@ -3413,7 +3413,7 @@ static void hci_key_refresh_complete_evt(struct hci_dev *hdev,
 
 	if (ev->status && conn->state == BT_CONNECTED) {
 		hci_acl_disconn(conn, HCI_ERROR_AUTH_FAILURE);
-		hci_conn_put(conn);
+		hci_conn_drop(conn);
 		goto unlock;
 	}
 
@@ -3422,13 +3422,13 @@ static void hci_key_refresh_complete_evt(struct hci_dev *hdev,
 			conn->state = BT_CONNECTED;
 
 		hci_proto_connect_cfm(conn, ev->status);
-		hci_conn_put(conn);
+		hci_conn_drop(conn);
 	} else {
 		hci_auth_cfm(conn, ev->status);
 
 		hci_conn_hold(conn);
 		conn->disc_timeout = HCI_DISCONN_TIMEOUT;
-		hci_conn_put(conn);
+		hci_conn_drop(conn);
 	}
 
 unlock:
@@ -3689,7 +3689,7 @@ static void hci_simple_pair_complete_evt(struct hci_dev *hdev,
 		mgmt_auth_failed(hdev, &conn->dst, conn->type, conn->dst_type,
 				 ev->status);
 
-	hci_conn_put(conn);
+	hci_conn_drop(conn);
 
 unlock:
 	hci_dev_unlock(hdev);
@@ -3777,7 +3777,7 @@ static void hci_phy_link_complete_evt(struct hci_dev *hdev,
 
 	hci_conn_hold(hcon);
 	hcon->disc_timeout = HCI_DISCONN_TIMEOUT;
-	hci_conn_put(hcon);
+	hci_conn_drop(hcon);
 
 	hci_conn_hold_device(hcon);
 	hci_conn_add_sysfs(hcon);
diff --git a/net/bluetooth/l2cap_core.c b/net/bluetooth/l2cap_core.c
index 22e6583..175dd32 100644
--- a/net/bluetooth/l2cap_core.c
+++ b/net/bluetooth/l2cap_core.c
@@ -571,7 +571,7 @@ void l2cap_chan_del(struct l2cap_chan *chan, int err)
 		chan->conn = NULL;
 
 		if (chan->chan_type != L2CAP_CHAN_CONN_FIX_A2MP)
-			hci_conn_put(conn->hcon);
+			hci_conn_drop(conn->hcon);
 
 		if (mgr && mgr->bredr_chan == chan)
 			mgr->bredr_chan = NULL;
@@ -1702,7 +1702,7 @@ int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid,
 
 	conn = l2cap_conn_add(hcon, 0);
 	if (!conn) {
-		hci_conn_put(hcon);
+		hci_conn_drop(hcon);
 		err = -ENOMEM;
 		goto done;
 	}
@@ -1712,7 +1712,7 @@ int l2cap_chan_connect(struct l2cap_chan *chan, __le16 psm, u16 cid,
 
 		if (!list_empty(&conn->chan_l)) {
 			err = -EBUSY;
-			hci_conn_put(hcon);
+			hci_conn_drop(hcon);
 		}
 
 		if (err)
diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c
index f559b96..cca9187 100644
--- a/net/bluetooth/mgmt.c
+++ b/net/bluetooth/mgmt.c
@@ -1857,7 +1857,7 @@ static void pairing_complete(struct pending_cmd *cmd, u8 status)
 	conn->security_cfm_cb = NULL;
 	conn->disconn_cfm_cb = NULL;
 
-	hci_conn_put(conn);
+	hci_conn_drop(conn);
 
 	mgmt_pending_remove(cmd);
 }
@@ -1943,7 +1943,7 @@ static int pair_device(struct sock *sk, struct hci_dev *hdev, void *data,
 	}
 
 	if (conn->connect_cfm_cb) {
-		hci_conn_put(conn);
+		hci_conn_drop(conn);
 		err = cmd_complete(sk, hdev->id, MGMT_OP_PAIR_DEVICE,
 				   MGMT_STATUS_BUSY, &rp, sizeof(rp));
 		goto unlock;
@@ -1952,7 +1952,7 @@ static int pair_device(struct sock *sk, struct hci_dev *hdev, void *data,
 	cmd = mgmt_pending_add(sk, MGMT_OP_PAIR_DEVICE, hdev, data, len);
 	if (!cmd) {
 		err = -ENOMEM;
-		hci_conn_put(conn);
+		hci_conn_drop(conn);
 		goto unlock;
 	}
 
diff --git a/net/bluetooth/sco.c b/net/bluetooth/sco.c
index 57f250c..727dc36 100644
--- a/net/bluetooth/sco.c
+++ b/net/bluetooth/sco.c
@@ -185,7 +185,7 @@ static int sco_connect(struct sock *sk)
 
 	conn = sco_conn_add(hcon);
 	if (!conn) {
-		hci_conn_put(hcon);
+		hci_conn_drop(hcon);
 		err = -ENOMEM;
 		goto done;
 	}
@@ -355,7 +355,7 @@ static void __sco_sock_close(struct sock *sk)
 		if (sco_pi(sk)->conn->hcon) {
 			sk->sk_state = BT_DISCONN;
 			sco_sock_set_timer(sk, SCO_DISCONN_TIMEOUT);
-			hci_conn_put(sco_pi(sk)->conn->hcon);
+			hci_conn_drop(sco_pi(sk)->conn->hcon);
 			sco_pi(sk)->conn->hcon = NULL;
 		} else
 			sco_chan_del(sk, ECONNRESET);
@@ -883,7 +883,7 @@ static void sco_chan_del(struct sock *sk, int err)
 		sco_conn_unlock(conn);
 
 		if (conn->hcon)
-			hci_conn_put(conn->hcon);
+			hci_conn_drop(conn->hcon);
 	}
 
 	sk->sk_state = BT_CLOSED;
diff --git a/net/bluetooth/smp.c b/net/bluetooth/smp.c
index 5abefb1..b2296d3 100644
--- a/net/bluetooth/smp.c
+++ b/net/bluetooth/smp.c
@@ -522,7 +522,7 @@ void smp_chan_destroy(struct l2cap_conn *conn)
 	kfree(smp);
 	conn->smp_chan = NULL;
 	conn->hcon->smp_conn = NULL;
-	hci_conn_put(conn->hcon);
+	hci_conn_drop(conn->hcon);
 }
 
 int smp_user_confirm_reply(struct hci_conn *hcon, u16 mgmt_op, __le32 passkey)
-- 
1.8.2