netdev - Re: [PATCH 0/8] can: usb: remove all usb_set_intfdata(intf, NULL) in drivers' disconnect()

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Date:   Thu, 8 Dec 2022 17:51:18 +0100
From:   Oliver Neukum <oneukum@...e.com>
To:     Vincent MAILHOL <mailhol.vincent@...adoo.fr>,
        Oliver Neukum <oneukum@...e.com>
Cc:     Marc Kleine-Budde <mkl@...gutronix.de>, linux-can@...r.kernel.org,
        Wolfgang Grandegger <wg@...ndegger.com>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Frank Jungclaus <frank.jungclaus@....eu>, socketcan@....eu,
        Yasushi SHOJI <yashi@...cecubics.com>,
        Stefan Mätje <stefan.maetje@....eu>,
        Hangyu Hua <hbh25y@...il.com>,
        Oliver Hartkopp <socketcan@...tkopp.net>,
        Peter Fink <pfink@...ist-es.de>,
        Jeroen Hofstee <jhofstee@...tronenergy.com>,
        Christoph Möhring <cmoehring@...ist-es.de>,
        John Whittington <git@...engineering.co.uk>,
        Vasanth Sadhasivan <vasanth.sadhasivan@...sara.com>,
        Jimmy Assarsson <extja@...ser.com>,
        Anssi Hannula <anssi.hannula@...wise.fi>,
        Pavel Skripkin <paskripkin@...il.com>,
        Stephane Grosjean <s.grosjean@...k-system.com>,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        "Gustavo A . R . Silva" <gustavoars@...nel.org>,
        Julia Lawall <Julia.Lawall@...ia.fr>,
        Dongliang Mu <dzm91@...t.edu.cn>,
        Sebastian Haas <haas@...-wuensche.com>,
        Maximilian Schneider <max@...neidersoft.net>,
        Daniel Berglund <db@...ser.com>,
        Olivier Sobrie <olivier@...rie.be>,
        Remigiusz Kołłątaj 
        <remigiusz.kollataj@...ica.com>,
        Jakob Unterwurzacher <jakob.unterwurzacher@...obroma-systems.com>,
        Martin Elshuber <martin.elshuber@...obroma-systems.com>,
        Bernd Krumboeck <b.krumboeck@...il.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Alan Stern <stern@...land.harvard.edu>,
        linux-usb@...r.kernel.org
Subject: Re: [PATCH 0/8] can: usb: remove all usb_set_intfdata(intf, NULL) in
 drivers' disconnect()


On 08.12.22 16:44, Vincent MAILHOL wrote:
> On Thu. 8 Dec. 2022 at 20:04, Oliver Neukum <oneukum@...e.com> wrote:
>> On 08.12.22 10:00, Vincent MAILHOL wrote:
>>> On Mon. 5 Dec. 2022 at 17:39, Oliver Neukum <oneukum@...e.com> wrote:
>>>> On 03.12.22 14:31, Vincent Mailhol wrote:
>>
>> Good Morning!
> 
> Good night! (different time zone :))

Good evening!

> 
> How do you check that disconnect() has proceeded *to a given point*
> using intf without being racy? You can check if it has already
> completed once but not check how far it has proceeded, right?

You'd use intfdata, which is a pointer stored in intf.

But other than that the simplest way would be to use a mutex.


	Regards
		Oliver