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Subject: Re: [PATCH v1] Bluetooth: L2CAP: add support for waiting
 disconnection resp
From:   Marcel Holtmann <marcel@holtmann.org>
In-Reply-To: <20200414160758.v1.1.Idab9dcdc7da549ed1fd5c66341fb8baffaee8d10@changeid>
Date:   Wed, 13 May 2020 10:04:21 +0200
Cc:     linux-bluetooth <linux-bluetooth@vger.kernel.org>,
        Luiz Augusto von Dentz <luiz.dentz@gmail.com>,
        Archie Pusaka <apusaka@chromium.org>,
        "David S. Miller" <davem@davemloft.net>,
        Jakub Kicinski <kuba@kernel.org>,
        Johan Hedberg <johan.hedberg@gmail.com>,
        linux-kernel@vger.kernel.org, netdev@vger.kernel.org
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To:     Archie Pusaka <apusaka@google.com>
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Hi Archie,

> Whenever we disconnect a L2CAP connection, we would immediately
> report a disconnection event (EPOLLHUP) to the upper layer, without
> waiting for the response of the other device.
> 
> This patch offers an option to wait until we receive a disconnection
> response before reporting disconnection event, by using the "how"
> parameter in l2cap_sock_shutdown(). Therefore, upper layer can opt
> to wait for disconnection response by shutdown(sock, SHUT_WR).
> 
> This can be used to enforce proper disconnection order in HID,
> where the disconnection of the interrupt channel must be complete
> before attempting to disconnect the control channel.
> 
> Signed-off-by: Archie Pusaka <apusaka@chromium.org>
> ---
> 
> net/bluetooth/l2cap_sock.c | 30 +++++++++++++++++++++++-------
> 1 file changed, 23 insertions(+), 7 deletions(-)

patch has been applied to bluetooth-next tree.

Regards

Marcel