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

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Message-Id: <20210405233305.92431-1-danielwinkler@google.com>
Date:   Mon,  5 Apr 2021 16:33:03 -0700
From:   Daniel Winkler <danielwinkler@...gle.com>
To:     marcel@...tmann.org, linux-bluetooth@...r.kernel.org
Cc:     chromeos-bluetooth-upstreaming@...omium.org,
        Daniel Winkler <danielwinkler@...gle.com>,
        "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: [PATCH 0/2] Bluetooth: Avoid centralized adv handle tracking for
 extended features

Hi Maintainers,

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(-)

-- 
2.31.0.208.g409f899ff0-goog