Bluetooth: hci_sync: Avoid adding default advertising on startup

list_empty(&hdev->adv_instances) is always true during startup,
so an advertising instance is added by default.

Call trace:
  dump_backtrace+0x94/0xec
  show_stack+0x18/0x24
  dump_stack_lvl+0x48/0x60
  dump_stack+0x18/0x24
  hci_setup_ext_adv_instance_sync+0x17c/0x328
  hci_powered_update_adv_sync+0xb4/0x12c
  hci_powered_update_sync+0x54/0x70
  hci_power_on_sync+0xe4/0x278
  hci_set_powered_sync+0x28/0x34
  set_powered_sync+0x40/0x58
  hci_cmd_sync_work+0x94/0x100
  process_one_work+0x168/0x444
  worker_thread+0x378/0x3f4
  kthread+0x108/0x10c
  ret_from_fork+0x10/0x20

Link: https://github.com/bluez/bluez/issues/1442
Signed-off-by: Yang Li <yang.li@amlogic.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

diff --git a/net/bluetooth/hci_sync.c b/net/bluetooth/hci_sync.c
index 2b4f21fbf9c1440dfc37aecbf7bb908a970d1018..7397b6b50ccbe6112e47f4db2919fc7eb3e1149e 100644 (file)
--- a/net/bluetooth/hci_sync.c
+++ b/net/bluetooth/hci_sync.c
@@ -3344,7 +3344,7 @@ static int hci_powered_update_adv_sync(struct hci_dev *hdev)
         * advertising data. This also applies to the case
         * where BR/EDR was toggled during the AUTO_OFF phase.
         */
-       if (hci_dev_test_flag(hdev, HCI_ADVERTISING) ||
+       if (hci_dev_test_flag(hdev, HCI_ADVERTISING) &&
            list_empty(&hdev->adv_instances)) {
                if (ext_adv_capable(hdev)) {
                        err = hci_setup_ext_adv_instance_sync(hdev, 0x00);