Bluetooth: hci_event: Disconnect device when BIG sync is lost

JIRA: https://issues.redhat.com/browse/RHEL-107922

commit 55b9551
Author: Yang Li <yang.li@amlogic.com>
Date:   Wed Aug 20 10:16:17 2025 +0800

    Bluetooth: hci_event: Disconnect device when BIG sync is lost

    When a BIG sync is lost, the device should be set to "disconnected".
    This ensures symmetry with the ISO path setup, where the device is
    marked as "connected" once the path is established. Without this
    change, the device state remains inconsistent and may lead to a
    memory leak.

    Fixes: b2a5f2e ("Bluetooth: hci_event: Add support for handling LE BIG Sync Lost event")
    Signed-off-by: Yang Li <yang.li@amlogic.com>
    Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

Signed-off-by: David Marlin <dmarlin@redhat.com>

Author: damarlin

net/bluetooth/hci_event.c

@@ -7004,6 +7004,7 @@ static void hci_le_big_sync_lost_evt(struct hci_dev *hdev, void *data,
 {
 	struct hci_evt_le_big_sync_lost *ev = data;
 	struct hci_conn *bis, *conn;
+	bool mgmt_conn;
 
 	bt_dev_dbg(hdev, "big handle 0x%2.2x", ev->handle);
 
@@ -7022,6 +7023,10 @@ static void hci_le_big_sync_lost_evt(struct hci_dev *hdev, void *data,
 	while ((bis = hci_conn_hash_lookup_big_state(hdev, ev->handle,
 						     BT_CONNECTED,
 						     HCI_ROLE_SLAVE))) {
+		mgmt_conn = test_and_clear_bit(HCI_CONN_MGMT_CONNECTED, &bis->flags);
+		mgmt_device_disconnected(hdev, &bis->dst, bis->type, bis->dst_type,
+					 ev->reason, mgmt_conn);
+
 		clear_bit(HCI_CONN_BIG_SYNC, &bis->flags);
 		hci_disconn_cfm(bis, ev->reason);
 		hci_conn_del(bis);

net/bluetooth/mgmt.c

@@ -9705,7 +9705,9 @@ void mgmt_device_disconnected(struct hci_dev *hdev, bdaddr_t *bdaddr,
 	if (!mgmt_connected)
 		return;
 
-	if (link_type != ACL_LINK && link_type != LE_LINK)
+	if (link_type != ACL_LINK &&
+	    link_type != LE_LINK  &&
+	    link_type != BIS_LINK)
 		return;
 
 	bacpy(&ev.addr.bdaddr, bdaddr);