linux-kernel - Re: [PATCH net-next v7 4/5] net/x25: fix restart request/confirm handling

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Message-ID: <CAJht_EMZqcPdE5n3Vp+jJa1sVk9+vbwd-Gbi8Xqy19bEdbNNuA@mail.gmail.com>
Date:   Wed, 9 Dec 2020 01:01:11 -0800
From:   Xie He <xie.he.0141@...il.com>
To:     Martin Schiller <ms@....tdt.de>
Cc:     Andrew Hendry <andrew.hendry@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Linux X25 <linux-x25@...r.kernel.org>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next v7 4/5] net/x25: fix restart request/confirm handling

On Wed, Nov 25, 2020 at 10:36 PM Martin Schiller <ms@....tdt.de> wrote:
>
> We have to take the actual link state into account to handle
> restart requests/confirms well.
>
> @@ -214,8 +241,6 @@ void x25_link_established(struct x25_neigh *nb)
>  {
>         switch (nb->state) {
>         case X25_LINK_STATE_0:
> -               nb->state = X25_LINK_STATE_2;
> -               break;
>         case X25_LINK_STATE_1:
>                 x25_transmit_restart_request(nb);
>                 nb->state = X25_LINK_STATE_2;

What is the reason for this change? Originally only the connecting
side will transmit a Restart Request; the connected side will not and
will only wait for the Restart Request to come. Now both sides will
transmit Restart Requests at the same time. I think we should better
avoid collision situations like this.