Return-Path: From: Alfonso Acosta To: linux-bluetooth@vger.kernel.org Subject: [PATCH v2] Bluetooth: Defer connection-parameter removal when unpairing without disconnecting Date: Fri, 10 Oct 2014 09:16:28 +0000 Message-Id: <1412932588-10826-1-git-send-email-fons@spotify.com> Sender: linux-bluetooth-owner@vger.kernel.org List-ID: Systematically removing the LE connection parameters and autoconnect action is inconvenient for rebonding without disconnecting from userland (i.e. unpairing followed by repairing without disconnecting). The parameters will be lost after unparing and userland needs to take care of book-keeping them and re-adding them. This patch allows userland to forget about parameter management when rebonding without disconnecting. It defers clearing the connection parameters when unparing without disconnecting, giving a chance of keeping the parameters if a repairing happens before the connection is closed. Signed-off-by: Alfonso Acosta --- include/net/bluetooth/hci_core.h | 1 + net/bluetooth/hci_conn.c | 6 ++++++ net/bluetooth/mgmt.c | 27 +++++++++++++++++++++------ 3 files changed, 28 insertions(+), 6 deletions(-) diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h index 07ddeed62..b8685a7 100644 --- a/include/net/bluetooth/hci_core.h +++ b/include/net/bluetooth/hci_core.h @@ -555,6 +555,7 @@ enum { HCI_CONN_STK_ENCRYPT, HCI_CONN_AUTH_INITIATOR, HCI_CONN_DROP, + HCI_CONN_PARAM_REMOVAL_PEND, }; static inline bool hci_conn_ssp_enabled(struct hci_conn *conn) diff --git a/net/bluetooth/hci_conn.c b/net/bluetooth/hci_conn.c index b9517bd..eb9988f 100644 --- a/net/bluetooth/hci_conn.c +++ b/net/bluetooth/hci_conn.c @@ -356,6 +356,9 @@ static void hci_conn_timeout(struct work_struct *work) conn->state = BT_CLOSED; break; } + + if (test_and_clear_bit(HCI_CONN_PARAM_REMOVAL_PEND, &conn->flags)) + hci_conn_params_del(conn->hdev, &conn->dst, conn->dst_type); } /* Enter sniff mode */ @@ -544,6 +547,9 @@ int hci_conn_del(struct hci_conn *conn) hci_conn_del_sysfs(conn); + if (test_bit(HCI_CONN_PARAM_REMOVAL_PEND, &conn->flags)) + hci_conn_params_del(conn->hdev, &conn->dst, conn->dst_type); + hci_dev_put(hdev); hci_conn_put(conn); diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c index 3fd88b0..943df45 100644 --- a/net/bluetooth/mgmt.c +++ b/net/bluetooth/mgmt.c @@ -2699,7 +2699,7 @@ static int unpair_device(struct sock *sk, struct hci_dev *hdev, void *data, struct mgmt_rp_unpair_device rp; struct hci_cp_disconnect dc; struct pending_cmd *cmd; - struct hci_conn *conn; + struct hci_conn *uninitialized_var(conn); int err; memset(&rp, 0, sizeof(rp)); @@ -2736,7 +2736,17 @@ static int unpair_device(struct sock *sk, struct hci_dev *hdev, void *data, hci_remove_irk(hdev, &cp->addr.bdaddr, addr_type); - hci_conn_params_del(hdev, &cp->addr.bdaddr, addr_type); + conn = hci_conn_hash_lookup_ba(hdev, LE_LINK, + &cp->addr.bdaddr); + + /* If the BLE connection is being used, defer clearing up + * the connection parameters until closing to give a + * chance of keeping them if a repairing happens. + */ + if (conn && !cp->disconnect) + set_bit(HCI_CONN_PARAM_REMOVAL_PEND, &conn->flags); + else + hci_conn_params_del(hdev, &cp->addr.bdaddr, addr_type); err = hci_remove_ltk(hdev, &cp->addr.bdaddr, addr_type); } @@ -2748,12 +2758,12 @@ static int unpair_device(struct sock *sk, struct hci_dev *hdev, void *data, } if (cp->disconnect) { + /* Only lookup the connection in the BR/EDR since the + * LE connection was already looked up earlier. + */ if (cp->addr.type == BDADDR_BREDR) conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &cp->addr.bdaddr); - else - conn = hci_conn_hash_lookup_ba(hdev, LE_LINK, - &cp->addr.bdaddr); } else { conn = NULL; } @@ -3212,8 +3222,13 @@ static int pair_device(struct sock *sk, struct hci_dev *hdev, void *data, cmd->user_data = hci_conn_get(conn); if ((conn->state == BT_CONNECTED || conn->state == BT_CONFIG) && - hci_conn_security(conn, sec_level, auth_type, true)) + hci_conn_security(conn, sec_level, auth_type, true)) { + /* The device is paired so there is no need to remove + * its connection parameters anymore. + */ + clear_bit(HCI_CONN_PARAM_REMOVAL_PEND, &conn->flags); pairing_complete(cmd, 0); + } err = 0; -- 1.9.1