netdev - Re: [PATCH net-next 2/3] xen-netback: switch state to InitWait at the end of netback

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Message-ID: <20191217152315.gxsi4idfxnmloe6u@debian>
Date:   Tue, 17 Dec 2019 15:23:15 +0000
From:   Wei Liu <wei.liu@...nel.org>
To:     Paul Durrant <pdurrant@...zon.com>
Cc:     xen-devel@...ts.xenproject.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Wei Liu <wei.liu@...nel.org>,
        Paul Durrant <paul@....org>,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH net-next 2/3] xen-netback: switch state to InitWait at
 the end of netback_probe()...

On Tue, Dec 17, 2019 at 01:32:17PM +0000, Paul Durrant wrote:
> ...as the comment above the function states.
> 
> The switch to Initialising at the start of the function is somewhat bogus
> as the toolstack will have set that initial state anyway. To behave
> correctly, a backend should switch to InitWait once it has set up all
> xenstore values that may be required by a initialising frontend. This
> patch calls backend_switch_state() to make the transition at the
> appropriate point.
> 
> NOTE: backend_switch_state() ignores errors from xenbus_switch_state()
>       and so this patch removes an error path from netback_probe(). This
>       means a failure to change state at this stage (in the absence of
>       other failures) will leave the device instantiated. This is highly
>       unlikley to happen as a failure to change state would indicate a
>       failure to write to xenstore, and that will trigger other error
>       paths. Also, a 'stuck' device can still be cleaned up using 'unbind'
>       in any case.
> 
> Signed-off-by: Paul Durrant <pdurrant@...zon.com>

Acked-by: Wei Liu <wei.liu@...nel.org>