linux-kernel - Re: [PATCH v2 1/3] can: dev: replace can_priv::ctrlmode_static by can_get_static

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Date:   Sun, 24 Oct 2021 20:30:07 +0200
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     Vincent Mailhol <mailhol.vincent@...adoo.fr>
Cc:     linux-can@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/3] can: dev: replace can_priv::ctrlmode_static by
 can_get_static_ctrlmode()

On 09.10.2021 22:13:02, Vincent Mailhol wrote:
> The statically enabled features of a CAN controller can be retrieved
> using below formula:
> 
> | u32 ctrlmode_static = priv->ctrlmode & ~priv->ctrlmode_supported;
> 
> As such, there is no need to store this information. This patch remove
> the field ctrlmode_static of struct can_priv and provides, in
> replacement, the inline function can_get_static_ctrlmode() which
> returns the same value.
> 
> A condition sine qua non for this to work is that the controller
> static modes should never be set in can_priv::ctrlmode_supported. This
> is already the case for existing drivers, however, we added a warning
> message in can_set_static_ctrlmode() to check that.

Please make the can_set_static_ctrlmode to return an error in case of a
problem. Adjust the drivers using the function is this patch, too.

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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