Bluetooth: Unwind l2cap_sock_shutdown()

l2cap_sock_shutdown() is designed to only action shutdown
of the channel when shutdown is not already in progress.
Therefore, reorganise the code flow by adding a goto
to jump to the end of function handling when shutdown is
already being actioned. This removes one level of code
indentation and make the code more readable.

Signed-off-by: Dean Jenkins <Dean_Jenkins@mentor.com>
Signed-off-by: Harish Jenny K N <harish_kandiga@mentor.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

1 files changed, 18 insertions, 14 deletions

diff --git a/net/bluetooth/l2cap_sock.c b/net/bluetooth/l2cap_sock.c
index 586b3d580cfc..ca5598d6a201 100644
--- a/net/bluetooth/l2cap_sock.c
+++ b/net/bluetooth/l2cap_sock.c
@@ -1111,6 +1111,11 @@ static int l2cap_sock_shutdown(struct socket *sock, int how)
         if (!sk)
                 return 0;
 
+        if (sk->sk_shutdown)
+                goto shutdown_already;
+
+        BT_DBG("Handling sock shutdown");
+
         /* prevent sk structure from being freed whilst unlocked */
         sock_hold(sk);
 
@@ -1127,23 +1132,21 @@ static int l2cap_sock_shutdown(struct socket *sock, int how)
         l2cap_chan_lock(chan);
         lock_sock(sk);
 
-        if (!sk->sk_shutdown) {
-                if (chan->mode == L2CAP_MODE_ERTM &&
-                    chan->unacked_frames > 0 &&
-                    chan->state == BT_CONNECTED)
-                        err = __l2cap_wait_ack(sk, chan);
+        if (chan->mode == L2CAP_MODE_ERTM &&
+            chan->unacked_frames > 0 &&
+            chan->state == BT_CONNECTED)
+                err = __l2cap_wait_ack(sk, chan);
 
-                sk->sk_shutdown = SHUTDOWN_MASK;
+        sk->sk_shutdown = SHUTDOWN_MASK;
 
-                release_sock(sk);
-                l2cap_chan_close(chan, 0);
-                lock_sock(sk);
+        release_sock(sk);
+        l2cap_chan_close(chan, 0);
+        lock_sock(sk);
 
-                if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime &&
-                    !(current->flags & PF_EXITING))
-                        err = bt_sock_wait_state(sk, BT_CLOSED,
-                                                 sk->sk_lingertime);
-        }
+        if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime &&
+            !(current->flags & PF_EXITING))
+                err = bt_sock_wait_state(sk, BT_CLOSED,
+                                         sk->sk_lingertime);
 
         if (!err && sk->sk_err)
                 err = -sk->sk_err;
@@ -1157,6 +1160,7 @@ static int l2cap_sock_shutdown(struct socket *sock, int how)
         l2cap_chan_put(chan);
         sock_put(sk);
 
+shutdown_already:
         BT_DBG("err: %d", err);
 
         return err;