linux-kernel - Re: [Xen-devel] [PATCH 2/4] xenbus: limit when state is forced to closed

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Message-ID: <b8a138ad-5770-65fa-f368-f7b4063702fa@suse.com>
Date:   Mon, 9 Dec 2019 12:55:01 +0100
From:   Jürgen Groß <jgross@...e.com>
To:     Roger Pau Monné <roger.pau@...rix.com>,
        Paul Durrant <pdurrant@...zon.com>
Cc:     linux-kernel@...r.kernel.org, xen-devel@...ts.xenproject.org,
        Stefano Stabellini <sstabellini@...nel.org>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>
Subject: Re: [Xen-devel] [PATCH 2/4] xenbus: limit when state is forced to
 closed

On 09.12.19 12:39, Roger Pau Monné wrote:
> On Thu, Dec 05, 2019 at 02:01:21PM +0000, Paul Durrant wrote:
>> Only force state to closed in the case when the toolstack may need to
>> clean up. This can be detected by checking whether the state in xenstore
>> has been set to closing prior to device removal.
> 
> I'm not sure I see the point of this, I would expect that a failure to
> probe or the removal of the device would leave the xenbus state as
> closed, which is consistent with the actual driver state.
> 
> Can you explain what's the benefit of leaving a device without a
> driver in such unknown state?

And more concerning: did you check that no frontend/backend is
relying on the closed state to be visible without closing having been
set before?


Juergen