netdev - Re: [PATCH net-next] net: mptcp: don't hang in mptcp

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Message-ID: <b4cc3997-c4d8-2f7c-30c8-1fb6922a910b@tessares.net>
Date:   Fri, 20 Mar 2020 16:54:45 +0100
From:   Matthieu Baerts <matthieu.baerts@...sares.net>
To:     Paolo Abeni <pabeni@...hat.com>,
        Davide Caratti <dcaratti@...hat.com>,
        Mat Martineau <mathew.j.martineau@...ux.intel.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     netdev@...r.kernel.org, mptcp@...ts.01.org
Subject: Re: [PATCH net-next] net: mptcp: don't hang in mptcp_sendmsg() after
 TCP fallback

On 19/03/2020 23:48, Paolo Abeni wrote:
> On Thu, 2020-03-19 at 22:45 +0100, Davide Caratti wrote:
>> it's still possible for packetdrill to hang in mptcp_sendmsg(), when the
>> MPTCP socket falls back to regular TCP (e.g. after receiving unsupported
>> flags/version during the three-way handshake). Adjust MPTCP socket state
>> earlier, to ensure correct functionality of mptcp_sendmsg() even in case
>> of TCP fallback.
>>
>> Fixes: 767d3ded5fb8 ("net: mptcp: don't hang before sending 'MP capable with data'")
>> Fixes: 1954b86016cf ("mptcp: Check connection state before attempting send")
>> Signed-off-by: Davide Caratti <dcaratti@...hat.com>
> 
> LGTM, thanks Davide!
> 
> Acked-by: Paolo Abeni <pabeni@...hat.com>

LGTM too, thanks Davide and Paolo!

Reviewed-by: Matthieu Baerts <matthieu.baerts@...sares.net>