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 20:56:11 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Pavel Machek <pavel@...x.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Hsin-Yi Wang <hsinyi@...omium.org>,
        Kai-Heng Feng <kai.heng.feng@...onical.com>,
        Marcel Holtmann <marcel@...tmann.org>,
        Mattijs Korpershoek <mkorpershoek@...libre.com>
Subject: Re: [PATCH 5.10 157/236] Bluetooth: Move shutdown callback before
 flushing tx and rx queue

On Wed, Sep 15, 2021 at 07:32:38AM -0700, Guenter Roeck wrote:
>On Wed, Sep 15, 2021 at 01:18:43PM +0200, Pavel Machek wrote:
>> 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.
>>
>
>Same problem in v5.4.y, unfortunately.

Ugh, odd - it wasn't manually backported :/

I'll drop it.

-- 
Thanks,
Sasha