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 <andre.guedes@xxxxxxxxxxxxx>
---
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 1800b50..dedd1ea 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;
}
--
1.8.4
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