netdev - Re: [PATCH net 2/3] can: gs_usb: gs_can_open(): fix race dev->can.state condition

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Message-ID: <20220922082338.a6mbf2bbtznr3lvz@pengutronix.de>
Date:   Thu, 22 Sep 2022 10:23:38 +0200
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     Matthieu Baerts <matthieu.baerts@...sares.net>
Cc:     netdev@...r.kernel.org, davem@...emloft.net, kuba@...nel.org,
        linux-can@...r.kernel.org, kernel@...gutronix.de,
        MPTCP Upstream <mptcp@...ts.linux.dev>
Subject: Re: [PATCH net 2/3] can: gs_usb: gs_can_open(): fix race
 dev->can.state condition

On 22.09.2022 10:04:55, Matthieu Baerts wrote:
> On 21/09/2022 10:36, Marc Kleine-Budde wrote:
> > The dev->can.state is set to CAN_STATE_ERROR_ACTIVE, after the device
> > has been started. On busy networks the CAN controller might receive
> > CAN frame between and go into an error state before the dev->can.state
> > is assigned.
> > 
> > Assign dev->can.state before starting the controller to close the race
> > window.
> > 
> > Fixes: d08e973a77d1 ("can: gs_usb: Added support for the GS_USB CAN devices")
> > Link: https://lore.kernel.org/all/20220920195216.232481-1-mkl@pengutronix.de
> > Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
> 
> FYI, we got a small conflict when merging -net in net-next in the MPTCP
> tree due to this patch applied in -net:
> 
>   5440428b3da6 ("can: gs_usb: gs_can_open(): fix race dev->can.state
> condition")
> 
> and this one from net-next:
> 
>   45dfa45f52e6 ("can: gs_usb: add RX and TX hardware timestamp support")
> 
> The conflict has been resolved on our side[1] and the resolution we
> suggest is attached to this email.

That patch looks good to me.

Thanks,
Marc

-- 
Pengutronix e.K.                 | Marc Kleine-Budde           |
Embedded Linux                   | https://www.pengutronix.de  |
Vertretung West/Dortmund         | Phone: +49-231-2826-924     |
Amtsgericht Hildesheim, HRA 2686 | Fax:   +49-5121-206917-5555 |

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