Bluetooth: Fix re-enabling advertising after a connection

LE controllers will automatically disable advertising whenever they
accept a new connection. In order not to fall out of sync with the
advertising setting we need to re-enable advertising whenever the last
LE connection drops. A failure to re-enable advertising should cause the
setting to be disabled, so this patch also calls mgmt_new_settings()
when this happens.

Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
index e1ad858..6eaef6e 100644 (file)
--- a/net/bluetooth/hci_event.c
+++ b/net/bluetooth/hci_event.c
@@ -1796,6 +1796,40 @@ static u8 hci_to_mgmt_reason(u8 err)
        }
 }
 
+static void adv_enable_complete(struct hci_dev *hdev, u8 status)
+{
+       BT_DBG("%s status %u", hdev->name, status);
+
+       /* Clear the advertising mgmt setting if we failed to re-enable it */
+       if (status) {
+               clear_bit(HCI_ADVERTISING, &hdev->dev_flags);
+               mgmt_new_settings(hdev);
+       }
+}
+
+static void reenable_advertising(struct hci_dev *hdev)
+{
+       struct hci_request req;
+       u8 enable = 0x01;
+
+       if (hdev->conn_hash.le_num)
+               return;
+
+       if (!test_bit(HCI_ADVERTISING, &hdev->dev_flags))
+               return;
+
+       hci_req_init(&req, hdev);
+       hci_req_add(&req, HCI_OP_LE_SET_ADV_ENABLE, sizeof(enable), &enable);
+
+       /* If this fails we have no option but to let user space know
+        * that we've disabled advertising.
+        */
+       if (hci_req_run(&req, adv_enable_complete) < 0) {
+               clear_bit(HCI_ADVERTISING, &hdev->dev_flags);
+               mgmt_new_settings(hdev);
+       }
+}
+
 static void hci_disconn_complete_evt(struct hci_dev *hdev, struct sk_buff *skb)
 {
        struct hci_ev_disconn_complete *ev = (void *) skb->data;
@@ -1826,10 +1860,25 @@ static void hci_disconn_complete_evt(struct hci_dev *hdev, struct sk_buff *skb)
        }
 
        if (ev->status == 0) {
-               if (conn->type == ACL_LINK && conn->flush_key)
+               u8 type = conn->type;
+
+               if (type == ACL_LINK && conn->flush_key)
                        hci_remove_link_key(hdev, &conn->dst);
                hci_proto_disconn_cfm(conn, ev->reason);
                hci_conn_del(conn);
+
+               /* Re-enable advertising if necessary, since it might
+                * have been disabled by the connection. From the
+                * HCI_LE_Set_Advertise_Enable command description in
+                * the core specification (v4.0):
+                * "The Controller shall continue advertising until the Host
+                * issues an LE_Set_Advertise_Enable command with
+                * Advertising_Enable set to 0x00 (Advertising is disabled)
+                * or until a connection is created or until the Advertising
+                * is timed out due to Directed Advertising."
+                */
+               if (type == LE_LINK)
+                       reenable_advertising(hdev);
        }
 
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