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

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Message-Id: <20191217.230355.1103471479325489165.davem@davemloft.net>
Date:   Tue, 17 Dec 2019 23:03:55 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     pdurrant@...zon.com
Cc:     xen-devel@...ts.xenproject.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, wei.liu@...nel.org, paul@....org
Subject: Re: [PATCH net-next 2/3] xen-netback: switch state to InitWait at
 the end of netback_probe()...

From: Paul Durrant <pdurrant@...zon.com>
Date: Tue, 17 Dec 2019 13:32:17 +0000

> ...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>

Applied.