Merge tag 'for-net-2022-07-05' of git://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth

Luiz Augusto von Dentz says:

====================
bluetooth pull request for net:

 - Fix deadlock when powering on.

* tag 'for-net-2022-07-05' of git://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth:
  Bluetooth: core: Fix deadlock on hci_power_on_sync.
====================

Link: https://lore.kernel.org/r/20220705202700.1689796-1-luiz.dentz@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Author: kuba-moo

net/bluetooth/hci_core.c

@@ -571,6 +571,7 @@ int hci_dev_close(__u16 dev)
 		goto done;
 	}
 
+	cancel_work_sync(&hdev->power_on);
 	if (hci_dev_test_and_clear_flag(hdev, HCI_AUTO_OFF))
 		cancel_delayed_work(&hdev->power_off);
 
@@ -2675,6 +2676,8 @@ void hci_unregister_dev(struct hci_dev *hdev)
 	list_del(&hdev->list);
 	write_unlock(&hci_dev_list_lock);
 
+	cancel_work_sync(&hdev->power_on);
+
 	hci_cmd_sync_clear(hdev);
 
 	if (!test_bit(HCI_QUIRK_NO_SUSPEND_NOTIFIER, &hdev->quirks))

net/bluetooth/hci_sync.c

@@ -4088,7 +4088,6 @@ int hci_dev_close_sync(struct hci_dev *hdev)
 
 	bt_dev_dbg(hdev, "");
 
-	cancel_work_sync(&hdev->power_on);
 	cancel_delayed_work(&hdev->power_off);
 	cancel_delayed_work(&hdev->ncmd_timer);