linux-kernel - Re: [PATCH v5] Bluetooth: Keep MSFT ext info throughout a hci

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Message-Id: <6670BE33-A403-43AC-B422-C4F363BEBC9C@holtmann.org>
Date:   Mon, 30 Aug 2021 17:02:22 +0200
From:   Marcel Holtmann <marcel@...tmann.org>
To:     Manish Mandlik <mmandlik@...gle.com>
Cc:     Luiz Augusto von Dentz <luiz.dentz@...il.com>,
        Archie Pusaka <apusaka@...omium.org>,
        "open list:BLUETOOTH SUBSYSTEM" <linux-bluetooth@...r.kernel.org>,
        Alain Michaud <alainm@...omium.org>,
        CrosBT Upstreaming <chromeos-bluetooth-upstreaming@...omium.org>,
        Abhishek Pandit-Subedi <abhishekpandit@...omium.org>,
        Miao-chen Chou <mcchou@...omium.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        open list <linux-kernel@...r.kernel.org>,
        netdev@...r.kernel.org
Subject: Re: [PATCH v5] Bluetooth: Keep MSFT ext info throughout a hci_dev's
 life cycle

Hi Manish,

> This moves msft_do_close() from hci_dev_do_close() to
> hci_unregister_dev() to avoid clearing MSFT extension info. This also
> re-reads MSFT info upon every msft_do_open() even if MSFT extension has
> been initialized.
> 
> The following test steps were performed.
> (1) boot the test device and verify the MSFT support debug log in syslog
> (2) restart bluetoothd and verify msft_do_close() doesn't get invoked
>    and msft_do_open re-reads the MSFT support.

so tell me how this can be correct. The msft_do_close does cleanup of instances. If we close the device via power down I would expect that these instances are cleared. Do they survive a HCI Reset command?

I think it would be better to introduce an additional msft_register / msft_unregister pair if this needs to be more complex.

Regards

Marcel