linux-kernel - Re: [PATCH] can: netlink: avoid call to do_set_data_bittiming callback with stale can

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Message-ID: <20240830-prompt-heavy-badger-caa81f-mkl@pengutronix.de>
Date: Fri, 30 Aug 2024 13:02:25 +0200
From: Marc Kleine-Budde <mkl@...gutronix.de>
To: Stefan Mätje <stefan.maetje@....eu>
Cc: Vincent Mailhol <mailhol.vincent@...adoo.fr>, 
	linux-can@...r.kernel.org, netdev@...r.kernel.org, linux-kernel@...r.kernel.org, 
	"David S . Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>
Subject: Re: [PATCH] can: netlink: avoid call to do_set_data_bittiming
 callback with stale can_priv::ctrlmode

On 08.08.2024 18:42:24, Stefan Mätje wrote:
> This patch moves the evaluation of data[IFLA_CAN_CTRLMODE] in function
> can_changelink in front of the evaluation of data[IFLA_CAN_BITTIMING].
> 
> This avoids a call to do_set_data_bittiming providing a stale
> can_priv::ctrlmode with a CAN_CTRLMODE_FD flag not matching the
> requested state when switching between a CAN Classic and CAN-FD bitrate.
> 
> In the same manner the evaluation of data[IFLA_CAN_CTRLMODE] in function
> can_validate is also moved in front of the evaluation of
> data[IFLA_CAN_BITTIMING].
> 
> This is a preparation for patches where the nominal and data bittiming
> may have interdependencies on the driver side depending on the
> CAN_CTRLMODE_FD flag state.
> 
> Signed-off-by: Stefan Mätje <stefan.maetje@....eu>

Added to linux-can-next.

Thanks,
Marc

-- 
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