linux-kernel - Re: [PATCH 0/3] Fix races on device removal

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Message-ID: <20200730065406.GB3950394@kroah.com>
Date:   Thu, 30 Jul 2020 08:54:06 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Lukas Wunner <lukas@...ner.de>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Pantelis Antoniou <pantelis.antoniou@...sulko.com>,
        Alexander Duyck <alexander.h.duyck@...ux.intel.com>,
        Mark Brown <broonie@...nel.org>, linux-kernel@...r.kernel.org,
        linux-spi@...r.kernel.org
Subject: Re: [PATCH 0/3] Fix races on device removal

On Wed, Jul 08, 2020 at 03:27:00PM +0200, Lukas Wunner wrote:
> Prevent dynamic SPI device addition below a controller which is
> being removed.  To do so, set the controller's "dead" flag using
> kill_device() (patch [3/3]).

Why is the SPI bus allowing this to happen?  Don't you have a per-bus
lock that can serialize all of this?

thanks,

greg k-h