[Bluetooth] Small cleanup of the L2CAP source code

This patch is a small cleanup of the L2CAP source code. It makes some
coding style changes and moves some functions around to avoid forward
declarations.

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

1 files changed, 177 insertions, 180 deletions

diff --git a/net/bluetooth/l2cap.c b/net/bluetooth/l2cap.c
index f6501fa0d59f..eaaad658d11d 100644
--- a/net/bluetooth/l2cap.c
+++ b/net/bluetooth/l2cap.c
@@ -63,11 +63,6 @@ static struct bt_sock_list l2cap_sk_list = {
         .lock = RW_LOCK_UNLOCKED
 };
 
-static int l2cap_conn_del(struct hci_conn *conn, int err);
-
-static void __l2cap_chan_add(struct l2cap_conn *conn, struct sock *sk, struct sock *parent);
-static void l2cap_chan_del(struct sock *sk, int err);
-
 static void __l2cap_sock_close(struct sock *sk, int reason);
 static void l2cap_sock_close(struct sock *sk);
 static void l2cap_sock_kill(struct sock *sk);
@@ -109,24 +104,177 @@ static void l2cap_sock_init_timer(struct sock *sk)
         sk->sk_timer.data = (unsigned long)sk;
 }
 
+/* ---- L2CAP channels ---- */
+static struct sock *__l2cap_get_chan_by_dcid(struct l2cap_chan_list *l, u16 cid)
+{
+        struct sock *s;
+        for (s = l->head; s; s = l2cap_pi(s)->next_c) {
+                if (l2cap_pi(s)->dcid == cid)
+                        break;
+        }
+        return s;
+}
+
+static struct sock *__l2cap_get_chan_by_scid(struct l2cap_chan_list *l, u16 cid)
+{
+        struct sock *s;
+        for (s = l->head; s; s = l2cap_pi(s)->next_c) {
+                if (l2cap_pi(s)->scid == cid)
+                        break;
+        }
+        return s;
+}
+
+/* Find channel with given SCID.
+ * Returns locked socket */
+static inline struct sock *l2cap_get_chan_by_scid(struct l2cap_chan_list *l, u16 cid)
+{
+        struct sock *s;
+        read_lock(&l->lock);
+        s = __l2cap_get_chan_by_scid(l, cid);
+        if (s) bh_lock_sock(s);
+        read_unlock(&l->lock);
+        return s;
+}
+
+static struct sock *__l2cap_get_chan_by_ident(struct l2cap_chan_list *l, u8 ident)
+{
+        struct sock *s;
+        for (s = l->head; s; s = l2cap_pi(s)->next_c) {
+                if (l2cap_pi(s)->ident == ident)
+                        break;
+        }
+        return s;
+}
+
+static inline struct sock *l2cap_get_chan_by_ident(struct l2cap_chan_list *l, u8 ident)
+{
+        struct sock *s;
+        read_lock(&l->lock);
+        s = __l2cap_get_chan_by_ident(l, ident);
+        if (s) bh_lock_sock(s);
+        read_unlock(&l->lock);
+        return s;
+}
+
+static u16 l2cap_alloc_cid(struct l2cap_chan_list *l)
+{
+        u16 cid = 0x0040;
+
+        for (; cid < 0xffff; cid++) {
+                if(!__l2cap_get_chan_by_scid(l, cid))
+                        return cid;
+        }
+
+        return 0;
+}
+
+static inline void __l2cap_chan_link(struct l2cap_chan_list *l, struct sock *sk)
+{
+        sock_hold(sk);
+
+        if (l->head)
+                l2cap_pi(l->head)->prev_c = sk;
+
+        l2cap_pi(sk)->next_c = l->head;
+        l2cap_pi(sk)->prev_c = NULL;
+        l->head = sk;
+}
+
+static inline void l2cap_chan_unlink(struct l2cap_chan_list *l, struct sock *sk)
+{
+        struct sock *next = l2cap_pi(sk)->next_c, *prev = l2cap_pi(sk)->prev_c;
+
+        write_lock(&l->lock);
+        if (sk == l->head)
+                l->head = next;
+
+        if (next)
+                l2cap_pi(next)->prev_c = prev;
+        if (prev)
+                l2cap_pi(prev)->next_c = next;
+        write_unlock(&l->lock);
+
+        __sock_put(sk);
+}
+
+static void __l2cap_chan_add(struct l2cap_conn *conn, struct sock *sk, struct sock *parent)
+{
+        struct l2cap_chan_list *l = &conn->chan_list;
+
+        BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn, l2cap_pi(sk)->psm, l2cap_pi(sk)->dcid);
+
+        l2cap_pi(sk)->conn = conn;
+
+        if (sk->sk_type == SOCK_SEQPACKET) {
+                /* Alloc CID for connection-oriented socket */
+                l2cap_pi(sk)->scid = l2cap_alloc_cid(l);
+        } else if (sk->sk_type == SOCK_DGRAM) {
+                /* Connectionless socket */
+                l2cap_pi(sk)->scid = 0x0002;
+                l2cap_pi(sk)->dcid = 0x0002;
+                l2cap_pi(sk)->omtu = L2CAP_DEFAULT_MTU;
+        } else {
+                /* Raw socket can send/recv signalling messages only */
+                l2cap_pi(sk)->scid = 0x0001;
+                l2cap_pi(sk)->dcid = 0x0001;
+                l2cap_pi(sk)->omtu = L2CAP_DEFAULT_MTU;
+        }
+
+        __l2cap_chan_link(l, sk);
+
+        if (parent)
+                bt_accept_enqueue(parent, sk);
+}
+
+/* Delete channel. 
+ * Must be called on the locked socket. */
+static void l2cap_chan_del(struct sock *sk, int err)
+{
+        struct l2cap_conn *conn = l2cap_pi(sk)->conn;
+        struct sock *parent = bt_sk(sk)->parent;
+
+        l2cap_sock_clear_timer(sk);
+
+        BT_DBG("sk %p, conn %p, err %d", sk, conn, err);
+
+        if (conn) { 
+                /* Unlink from channel list */
+                l2cap_chan_unlink(&conn->chan_list, sk);
+                l2cap_pi(sk)->conn = NULL;
+                hci_conn_put(conn->hcon);
+        }
+
+        sk->sk_state  = BT_CLOSED;
+        sock_set_flag(sk, SOCK_ZAPPED);
+
+        if (err)
+                sk->sk_err = err;
+
+        if (parent) {
+                bt_accept_unlink(sk);
+                parent->sk_data_ready(parent, 0);
+        } else
+                sk->sk_state_change(sk);
+}
+
 /* ---- L2CAP connections ---- */
 static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status)
 {
-        struct l2cap_conn *conn;
-
-        if ((conn = hcon->l2cap_data))
-                return conn;
+        struct l2cap_conn *conn = hcon->l2cap_data;
 
-        if (status)
+        if (conn || status)
                 return conn;
 
-        if (!(conn = kmalloc(sizeof(struct l2cap_conn), GFP_ATOMIC)))
+        conn = kzalloc(sizeof(struct l2cap_conn), GFP_ATOMIC);
+        if (!conn)
                 return NULL;
-        memset(conn, 0, sizeof(struct l2cap_conn));
 
         hcon->l2cap_data = conn;
         conn->hcon = hcon;
 
+        BT_DBG("hcon %p conn %p", hcon, conn);
+
         conn->mtu = hcon->hdev->acl_mtu;
         conn->src = &hcon->hdev->bdaddr;
         conn->dst = &hcon->dst;
@@ -134,17 +282,16 @@ static struct l2cap_conn *l2cap_conn_add(struct hci_conn *hcon, u8 status)
         spin_lock_init(&conn->lock);
         rwlock_init(&conn->chan_list.lock);
 
-        BT_DBG("hcon %p conn %p", hcon, conn);
         return conn;
 }
 
-static int l2cap_conn_del(struct hci_conn *hcon, int err)
+static void l2cap_conn_del(struct hci_conn *hcon, int err)
 {
-        struct l2cap_conn *conn;
+        struct l2cap_conn *conn = hcon->l2cap_data;
         struct sock *sk;
 
-        if (!(conn = hcon->l2cap_data)) 
-                return 0;
+        if (!conn)
+                return;
 
         BT_DBG("hcon %p conn %p, err %d", hcon, conn, err);
 
@@ -161,7 +308,6 @@ static int l2cap_conn_del(struct hci_conn *hcon, int err)
 
         hcon->l2cap_data = NULL;
         kfree(conn);
-        return 0;
 }
 
 static inline void l2cap_chan_add(struct l2cap_conn *conn, struct sock *sk, struct sock *parent)
@@ -925,160 +1071,6 @@ static int l2cap_sock_release(struct socket *sock)
         return err;
 }
 
-/* ---- L2CAP channels ---- */
-static struct sock *__l2cap_get_chan_by_dcid(struct l2cap_chan_list *l, u16 cid)
-{
-        struct sock *s;
-        for (s = l->head; s; s = l2cap_pi(s)->next_c) {
-                if (l2cap_pi(s)->dcid == cid)
-                        break;
-        }
-        return s;
-}
-
-static struct sock *__l2cap_get_chan_by_scid(struct l2cap_chan_list *l, u16 cid)
-{
-        struct sock *s;
-        for (s = l->head; s; s = l2cap_pi(s)->next_c) {
-                if (l2cap_pi(s)->scid == cid)
-                        break;
-        }
-        return s;
-}
-
-/* Find channel with given SCID.
- * Returns locked socket */
-static inline struct sock *l2cap_get_chan_by_scid(struct l2cap_chan_list *l, u16 cid)
-{
-        struct sock *s;
-        read_lock(&l->lock);
-        s = __l2cap_get_chan_by_scid(l, cid);
-        if (s) bh_lock_sock(s);
-        read_unlock(&l->lock);
-        return s;
-}
-
-static struct sock *__l2cap_get_chan_by_ident(struct l2cap_chan_list *l, u8 ident)
-{
-        struct sock *s;
-        for (s = l->head; s; s = l2cap_pi(s)->next_c) {
-                if (l2cap_pi(s)->ident == ident)
-                        break;
-        }
-        return s;
-}
-
-static inline struct sock *l2cap_get_chan_by_ident(struct l2cap_chan_list *l, u8 ident)
-{
-        struct sock *s;
-        read_lock(&l->lock);
-        s = __l2cap_get_chan_by_ident(l, ident);
-        if (s) bh_lock_sock(s);
-        read_unlock(&l->lock);
-        return s;
-}
-
-static u16 l2cap_alloc_cid(struct l2cap_chan_list *l)
-{
-        u16 cid = 0x0040;
-
-        for (; cid < 0xffff; cid++) {
-                if(!__l2cap_get_chan_by_scid(l, cid))
-                        return cid;
-        }
-
-        return 0;
-}
-
-static inline void __l2cap_chan_link(struct l2cap_chan_list *l, struct sock *sk)
-{
-        sock_hold(sk);
-
-        if (l->head)
-                l2cap_pi(l->head)->prev_c = sk;
-
-        l2cap_pi(sk)->next_c = l->head;
-        l2cap_pi(sk)->prev_c = NULL;
-        l->head = sk;
-}
-
-static inline void l2cap_chan_unlink(struct l2cap_chan_list *l, struct sock *sk)
-{
-        struct sock *next = l2cap_pi(sk)->next_c, *prev = l2cap_pi(sk)->prev_c;
-
-        write_lock(&l->lock);
-        if (sk == l->head)
-                l->head = next;
-
-        if (next)
-                l2cap_pi(next)->prev_c = prev;
-        if (prev)
-                l2cap_pi(prev)->next_c = next;
-        write_unlock(&l->lock);
-
-        __sock_put(sk);
-}
-
-static void __l2cap_chan_add(struct l2cap_conn *conn, struct sock *sk, struct sock *parent)
-{
-        struct l2cap_chan_list *l = &conn->chan_list;
-
-        BT_DBG("conn %p, psm 0x%2.2x, dcid 0x%4.4x", conn, l2cap_pi(sk)->psm, l2cap_pi(sk)->dcid);
-
-        l2cap_pi(sk)->conn = conn;
-
-        if (sk->sk_type == SOCK_SEQPACKET) {
-                /* Alloc CID for connection-oriented socket */
-                l2cap_pi(sk)->scid = l2cap_alloc_cid(l);
-        } else if (sk->sk_type == SOCK_DGRAM) {
-                /* Connectionless socket */
-                l2cap_pi(sk)->scid = 0x0002;
-                l2cap_pi(sk)->dcid = 0x0002;
-                l2cap_pi(sk)->omtu = L2CAP_DEFAULT_MTU;
-        } else {
-                /* Raw socket can send/recv signalling messages only */
-                l2cap_pi(sk)->scid = 0x0001;
-                l2cap_pi(sk)->dcid = 0x0001;
-                l2cap_pi(sk)->omtu = L2CAP_DEFAULT_MTU;
-        }
-
-        __l2cap_chan_link(l, sk);
-
-        if (parent)
-                bt_accept_enqueue(parent, sk);
-}
-
-/* Delete channel. 
- * Must be called on the locked socket. */
-static void l2cap_chan_del(struct sock *sk, int err)
-{
-        struct l2cap_conn *conn = l2cap_pi(sk)->conn;
-        struct sock *parent = bt_sk(sk)->parent;
-
-        l2cap_sock_clear_timer(sk);
-
-        BT_DBG("sk %p, conn %p, err %d", sk, conn, err);
-
-        if (conn) { 
-                /* Unlink from channel list */
-                l2cap_chan_unlink(&conn->chan_list, sk);
-                l2cap_pi(sk)->conn = NULL;
-                hci_conn_put(conn->hcon);
-        }
-
-        sk->sk_state  = BT_CLOSED;
-        sock_set_flag(sk, SOCK_ZAPPED);
-
-        if (err)
-                sk->sk_err = err;
-
-        if (parent) {
-                bt_accept_unlink(sk);
-                parent->sk_data_ready(parent, 0);
-        } else
-                sk->sk_state_change(sk);
-}
-
 static void l2cap_conn_ready(struct l2cap_conn *conn)
 {
         struct l2cap_chan_list *l = &conn->chan_list;
@@ -1834,7 +1826,9 @@ drop:
         kfree_skb(skb);
 
 done:
-        if (sk) bh_unlock_sock(sk);
+        if (sk)
+                bh_unlock_sock(sk);
+
         return 0;
 }
 
@@ -1925,18 +1919,18 @@ static int l2cap_connect_ind(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 type)
 
 static int l2cap_connect_cfm(struct hci_conn *hcon, u8 status)
 {
+        struct l2cap_conn *conn;
+
         BT_DBG("hcon %p bdaddr %s status %d", hcon, batostr(&hcon->dst), status);
 
         if (hcon->type != ACL_LINK)
                 return 0;
 
         if (!status) {
-                struct l2cap_conn *conn;
-
                 conn = l2cap_conn_add(hcon, status);
                 if (conn)
                         l2cap_conn_ready(conn);
-        } else 
+        } else
                 l2cap_conn_del(hcon, bt_err(status));
 
         return 0;
@@ -1950,19 +1944,21 @@ static int l2cap_disconn_ind(struct hci_conn *hcon, u8 reason)
                 return 0;
 
         l2cap_conn_del(hcon, bt_err(reason));
+
         return 0;
 }
 
 static int l2cap_auth_cfm(struct hci_conn *hcon, u8 status)
 {
         struct l2cap_chan_list *l;
-        struct l2cap_conn *conn;
+        struct l2cap_conn *conn = conn = hcon->l2cap_data;
         struct l2cap_conn_rsp rsp;
         struct sock *sk;
         int result;
 
-        if (!(conn = hcon->l2cap_data))
+        if (!conn)
                 return 0;
+
         l = &conn->chan_list;
 
         BT_DBG("conn %p", conn);
@@ -2005,13 +2001,14 @@ static int l2cap_auth_cfm(struct hci_conn *hcon, u8 status)
 static int l2cap_encrypt_cfm(struct hci_conn *hcon, u8 status)
 {
         struct l2cap_chan_list *l;
-        struct l2cap_conn *conn;
+        struct l2cap_conn *conn = hcon->l2cap_data;
         struct l2cap_conn_rsp rsp;
         struct sock *sk;
         int result;
 
-        if (!(conn = hcon->l2cap_data))
+        if (!conn)
                 return 0;
+
         l = &conn->chan_list;
 
         BT_DBG("conn %p", conn);