linux-kernel - Re: [PATCH v2 1/2] xen/xenbus: reference count registered modules

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Message-ID: <82ff3fdf-b6f6-656d-4638-3b9f0a264fab@suse.com>
Date:   Fri, 29 Nov 2019 16:46:15 +0100
From:   Jürgen Groß <jgross@...e.com>
To:     Paul Durrant <pdurrant@...zon.com>, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, xen-devel@...ts.xenproject.org
Cc:     Jan Beulich <jbeulich@...e.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Stefano Stabellini <sstabellini@...nel.org>
Subject: Re: [PATCH v2 1/2] xen/xenbus: reference count registered modules

On 29.11.19 14:43, Paul Durrant wrote:
> To prevent a module being removed whilst attached to a frontend, and
> hence xenbus calling into potentially invalid text, take a reference on
> the module before calling the probe() method (dropping it if unsuccessful)
> and drop the reference after returning from the remove() method.
> 
> NOTE: This allows the ad-hoc reference counting in xen-netback to be
>        removed. This will be done in a subsequent patch.
> 
> Suggested-by: Jan Beulich <jbeulich@...e.com>
> Signed-off-by: Paul Durrant <pdurrant@...zon.com>

Reviewed-by: Juergen Gross <jgross@...e.com>


Juergen