linux-kernel - Re: [PATCH 5.10 157/236] Bluetooth: Move shutdown callback before flushing tx and rx queue

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Date:   Wed, 15 Sep 2021 13:18:43 +0200
From:   Pavel Machek <pavel@...x.de>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Hsin-Yi Wang <hsinyi@...omium.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Kai-Heng Feng <kai.heng.feng@...onical.com>,
        Marcel Holtmann <marcel@...tmann.org>,
        Sasha Levin <sashal@...nel.org>,
        Mattijs Korpershoek <mkorpershoek@...libre.com>
Subject: Re: [PATCH 5.10 157/236] Bluetooth: Move shutdown callback before
 flushing tx and rx queue

Hi!

> [ Upstream commit 0ea53674d07fb6db2dd7a7ec2fdc85a12eb246c2 ]

Upstream commit is okay...

> So move the shutdown callback before flushing TX/RX queue to resolve the
> issue.

...but something went wrong in stable. This is not moving code, this
is duplicating it:

> --- a/net/bluetooth/hci_core.c
> +++ b/net/bluetooth/hci_core.c
> @@ -1726,6 +1726,14 @@ int hci_dev_do_close(struct hci_dev *hdev)
>  	hci_request_cancel_all(hdev);
>  	hci_req_sync_lock(hdev);
>  
> +	if (!hci_dev_test_flag(hdev, HCI_UNREGISTER) &&
> +	    !hci_dev_test_flag(hdev, HCI_USER_CHANNEL) &&
> +	    test_bit(HCI_UP, &hdev->flags)) {
> +		/* Execute vendor specific shutdown routine */
> +		if (hdev->shutdown)
> +			hdev->shutdown(hdev);
> +	}
> +
>  	if (!test_and_clear_bit(HCI_UP, &hdev->flags)) {
>  		cancel_delayed_work_sync(&hdev->cmd_timer);
>  		hci_req_sync_unlock(hdev);

And yes, we end up with 2 copies in 5.10.

Best regards,
								Pavel
--
DENX Software Engineering GmbH,      Managing Director: Wolfgang Denk
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany

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