Bluetooth: Fix LE connection timeout deadlock

The le_conn_timeout() may call hci_le_conn_failed() which in turn may
call hci_conn_del(). Trying to use the _sync variant for cancelling the
conn timeout from hci_conn_del() could therefore result in a deadlock.
This patch converts hci_conn_del() to use the non-sync variant so the
deadlock is not possible.

Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Cc: stable@vger.kernel.org # 3.16.x

diff --git a/net/bluetooth/hci_conn.c b/net/bluetooth/hci_conn.c
index 6a3225bf7bacfe4aa8606d822bd2c58cde0f1f91..74b8e2421e96c84bf6e7dc95c6cc94e4b4ba8bb1 100644 (file)
--- a/net/bluetooth/hci_conn.c
+++ b/net/bluetooth/hci_conn.c
@@ -518,7 +518,7 @@ int hci_conn_del(struct hci_conn *conn)
                /* Unacked frames */
                hdev->acl_cnt += conn->sent;
        } else if (conn->type == LE_LINK) {
-               cancel_delayed_work_sync(&conn->le_conn_timeout);
+               cancel_delayed_work(&conn->le_conn_timeout);
 
                if (hdev->le_pkts)
                        hdev->le_cnt += conn->sent;