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

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Message-ID: <YUME73+UUdOOHzMd@kroah.com>
Date:   Thu, 16 Sep 2021 10:48:47 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Sasha Levin <sashal@...nel.org>
Cc:     Guenter Roeck <linux@...ck-us.net>, Pavel Machek <pavel@...x.de>,
        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 08:56:11PM -0400, Sasha Levin wrote:
> 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.

Also now dropped from 5.13.y.

thanks,

greg k-h