linux-kernel - Re: [PATCH v4 5/6] can: c_can: prepare to up the message objects number

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Message-ID: <20210304152618.rqajqmzcqqhszfem@pengutronix.de>
Date:   Thu, 4 Mar 2021 16:26:18 +0100
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     Dario Binacchi <dariobin@...ero.it>
Cc:     linux-kernel@...r.kernel.org,
        Alexander Stein <alexander.stein@...tec-electronic.com>,
        Federico Vaga <federico.vaga@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Oliver Hartkopp <socketcan@...tkopp.net>,
        Vincent Mailhol <mailhol.vincent@...adoo.fr>,
        Wolfgang Grandegger <wg@...ndegger.com>,
        YueHaibing <yuehaibing@...wei.com>,
        Zhang Qilong <zhangqilong3@...wei.com>,
        linux-can@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH v4 5/6] can: c_can: prepare to up the message objects
 number

On 02.03.2021 22:54:34, Dario Binacchi wrote:
> diff --git a/drivers/net/can/c_can/c_can.c b/drivers/net/can/c_can/c_can.c
> index 77b9aee56154..0052ba5197e0 100644
> --- a/drivers/net/can/c_can/c_can.c
> +++ b/drivers/net/can/c_can/c_can.c
[...]
> -struct net_device *alloc_c_can_dev(void)
> +struct net_device *alloc_c_can_dev(int msg_obj_num)
>  {
>  	struct net_device *dev;
>  	struct c_can_priv *priv;
> +	int msg_obj_tx_num = msg_obj_num / 2;
>  
> -	dev = alloc_candev(sizeof(struct c_can_priv), C_CAN_MSG_OBJ_TX_NUM);
> +	dev = alloc_candev(sizeof(*priv) + sizeof(u32) * msg_obj_tx_num,
> +			   msg_obj_tx_num);

I've converted this to make use of the struct_size() macro:

+       dev = alloc_candev(struct_size(priv, dlc, msg_obj_tx_num),
+                          msg_obj_tx_num);

regards,
Marc

-- 
Pengutronix e.K.                 | Marc Kleine-Budde           |
Embedded Linux                   | https://www.pengutronix.de  |
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