linux-kernel - Re: [PATCH 0/2] Bluetooth: Avoid centralized adv handle tracking for extended features

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Date:   Tue, 6 Apr 2021 10:44:48 +0200
From:   Marcel Holtmann <marcel@...tmann.org>
To:     Daniel Winkler <danielwinkler@...gle.com>
Cc:     linux-bluetooth <linux-bluetooth@...r.kernel.org>,
        CrosBT Upstreaming <chromeos-bluetooth-upstreaming@...omium.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        Luiz Augusto von Dentz <luiz.dentz@...il.com>,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH 0/2] Bluetooth: Avoid centralized adv handle tracking for
 extended features

Hi Daniel,

> This series addresses a race condition where an advertisement
> registration can conflict with a software rotation advertisement
> refresh. I found that this issue was only occurring with the new
> extended MGMT advertising interface. A bad use of the
> hdev->cur_adv_instance caused every new instance to be immediately sent
> to the controller rather than queued for software rotation, opening a
> path for the race to occur.
> 
> This series improves the way new extended advertising hci callbacks
> track the relevant adv handle, removing the need for the
> cur_adv_instance use. In a separate patch, the incorrect usage of
> cur_adv_instance is removed, to align the extended MGMT commands to the
> original add_advertising usage. The series was tested on both extended
> and non-extended bluetooth controllers to confirm that the race
> condition is resolved, and that multi- and single-advertising automated
> test scenarios are still successful.
> 
> Thanks in advance,
> Daniel
> 
> 
> Daniel Winkler (2):
>  Bluetooth: Use ext adv handle from requests in CCs
>  Bluetooth: Do not set cur_adv_instance in adv param MGMT request
> 
> net/bluetooth/hci_event.c | 16 +++++++---------
> net/bluetooth/mgmt.c      |  1 -
> 2 files changed, 7 insertions(+), 10 deletions(-)

both patches have been applied to bluetooth-next tree.

Regards

Marcel