From 620ad5219c0f0aa43731b2fd8fd9efac78c10deb Mon Sep 17 00:00:00 2001 From: Andre Guedes Date: Tue, 8 Oct 2013 08:21:18 -0300 Subject: [PATCH] Bluetooth: Refactor hci_connect_le This patch does some code refactoring in hci_connect_le() by moving the exception code into if statements and letting the main flow in first level of function scope. It also adds extra comments to improve the code readability. Signed-off-by: Andre Guedes Signed-off-by: Marcel Holtmann --- net/bluetooth/hci_conn.c | 51 ++++++++++++++++++++++++++-------------- 1 file changed, 33 insertions(+), 18 deletions(-) diff --git a/net/bluetooth/hci_conn.c b/net/bluetooth/hci_conn.c index 1800b50558e4..dedd1ea5dd4c 100644 --- a/net/bluetooth/hci_conn.c +++ b/net/bluetooth/hci_conn.c @@ -594,32 +594,47 @@ static struct hci_conn *hci_connect_le(struct hci_dev *hdev, bdaddr_t *dst, if (test_bit(HCI_ADVERTISING, &hdev->flags)) return ERR_PTR(-ENOTSUPP); + /* Some devices send ATT messages as soon as the physical link is + * established. To be able to handle these ATT messages, the user- + * space first establishes the connection and then starts the pairing + * process. + * + * So if a hci_conn object already exists for the following connection + * attempt, we simply update pending_sec_level and auth_type fields + * and return the object found. + */ conn = hci_conn_hash_lookup_ba(hdev, LE_LINK, dst); - if (!conn) { - conn = hci_conn_hash_lookup_state(hdev, LE_LINK, BT_CONNECT); - if (conn) - return ERR_PTR(-EBUSY); - - conn = hci_conn_add(hdev, LE_LINK, dst); - if (!conn) - return ERR_PTR(-ENOMEM); + if (conn) { + conn->pending_sec_level = sec_level; + conn->auth_type = auth_type; + goto done; + } - conn->dst_type = bdaddr_to_le(dst_type); - conn->state = BT_CONNECT; - conn->out = true; - conn->link_mode |= HCI_LM_MASTER; - conn->sec_level = BT_SECURITY_LOW; + /* Since the controller supports only one LE connection attempt at a + * time, we return -EBUSY if there is any connection attempt running. + */ + conn = hci_conn_hash_lookup_state(hdev, LE_LINK, BT_CONNECT); + if (conn) + return ERR_PTR(-EBUSY); - err = hci_create_le_conn(conn); - if (err) - return ERR_PTR(err); - } + conn = hci_conn_add(hdev, LE_LINK, dst); + if (!conn) + return ERR_PTR(-ENOMEM); + conn->dst_type = bdaddr_to_le(dst_type); + conn->state = BT_CONNECT; + conn->out = true; + conn->link_mode |= HCI_LM_MASTER; + conn->sec_level = BT_SECURITY_LOW; conn->pending_sec_level = sec_level; conn->auth_type = auth_type; - hci_conn_hold(conn); + err = hci_create_le_conn(conn); + if (err) + return ERR_PTR(err); +done: + hci_conn_hold(conn); return conn; } -- 2.30.2