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Date:   Tue, 05 Jul 2022 21:50:13 +0000
To:     Vasyl Vavrychuk <>
Subject: Re: [PATCH] Bluetooth: core: Fix deadlock due to
 `cancel_work_sync(&hdev->power_on)` from hci_power_on_sync.


This patch was applied to netdev/net.git (master)
by Luiz Augusto von Dentz <>:

On Tue,  5 Jul 2022 15:59:31 +0300 you wrote:
> `cancel_work_sync(&hdev->power_on)` was moved to hci_dev_close_sync in
> commit [1] to ensure that power_on work is canceled after HCI interface
> down.
> But, in certain cases power_on work function may call hci_dev_close_sync
> itself: hci_power_on -> hci_dev_do_close -> hci_dev_close_sync ->
> cancel_work_sync(&hdev->power_on), causing deadlock. In particular, this
> happens when device is rfkilled on boot. To avoid deadlock, move
> power_on work canceling out of hci_dev_do_close/hci_dev_close_sync.
> [...]

Here is the summary with links:
  - Bluetooth: core: Fix deadlock due to `cancel_work_sync(&hdev->power_on)` from hci_power_on_sync.

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