Revert "Bluetooth: Fix possible deadlock in SCO code"

This reverts commit 269c4845d5b3627b95b1934107251bacbe99bb68.

The commit was causing dead locks and NULL dereferences in the sco code:

 [28084.104013] BUG: soft lockup - CPU#0 stuck for 22s! [kworker/u:0H:7]
 [28084.104021] Modules linked in: btusb bluetooth <snip [last unloaded:
bluetooth]
...
 [28084.104021]  [<c160246d>] _raw_spin_lock+0xd/0x10
 [28084.104021]  [<f920e708>] sco_conn_del+0x58/0x1b0 [bluetooth]
 [28084.104021]  [<f920f1a9>] sco_connect_cfm+0xb9/0x2b0 [bluetooth]
 [28084.104021]  [<f91ef289>]
hci_sync_conn_complete_evt.isra.94+0x1c9/0x260 [bluetooth]
 [28084.104021]  [<f91f1a8d>] hci_event_packet+0x74d/0x2b40 [bluetooth]
 [28084.104021]  [<c1501abd>] ? __kfree_skb+0x3d/0x90
 [28084.104021]  [<c1501b46>] ? kfree_skb+0x36/0x90
 [28084.104021]  [<f91fcb4e>] ? hci_send_to_monitor+0x10e/0x190 [bluetooth]
 [28084.104021]  [<f91fcb4e>] ? hci_send_to_monitor+0x10e/0x190 [bluetooth]

Cc: stable@vger.kernel.org
Reported-by: Chan-yeol Park <chanyeol.park@gmail.com>
Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>

1 files changed, 10 insertions, 9 deletions

diff --git a/net/bluetooth/sco.c b/net/bluetooth/sco.c
index eea17cdcaf7f..531a93d613d4 100644
--- a/net/bluetooth/sco.c
+++ b/net/bluetooth/sco.c
@@ -131,15 +131,6 @@ static int sco_conn_del(struct hci_conn *hcon, int err)
                 sco_sock_clear_timer(sk);
                 sco_chan_del(sk, err);
                 bh_unlock_sock(sk);
-
-                sco_conn_lock(conn);
-                conn->sk = NULL;
-                sco_pi(sk)->conn = NULL;
-                sco_conn_unlock(conn);
-
-                if (conn->hcon)
-                        hci_conn_put(conn->hcon);
-
                 sco_sock_kill(sk);
         }
 
@@ -885,6 +876,16 @@ static void sco_chan_del(struct sock *sk, int err)
 
         BT_DBG("sk %p, conn %p, err %d", sk, conn, err);
 
+        if (conn) {
+                sco_conn_lock(conn);
+                conn->sk = NULL;
+                sco_pi(sk)->conn = NULL;
+                sco_conn_unlock(conn);
+
+                if (conn->hcon)
+                        hci_conn_put(conn->hcon);
+        }
+
         sk->sk_state = BT_CLOSED;
         sk->sk_err   = err;
         sk->sk_state_change(sk);