linux-kernel - Re: [PATCH v2 5/6] can: c_can: prepare to up the message objects number

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Message-ID: <20210226092158.krmrds75hy6g3vks@pengutronix.de>
Date:   Fri, 26 Feb 2021 10:21:58 +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 v2 5/6] can: c_can: prepare to up the message objects
 number

On 25.02.2021 22:51:54, Dario Binacchi wrote:
> --- 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);
>  	if (!dev)
>  		return NULL;
>  
>  	priv = netdev_priv(dev);
> -	netif_napi_add(dev, &priv->napi, c_can_poll, C_CAN_NAPI_WEIGHT);
> +	priv->msg_obj_num = msg_obj_num;
> +	priv->msg_obj_rx_num = msg_obj_num - msg_obj_tx_num;
> +	priv->msg_obj_rx_first = 1;
> +	priv->msg_obj_rx_last =
> +		priv->msg_obj_rx_first + priv->msg_obj_rx_num - 1;
> +	priv->msg_obj_rx_mask = ((u64)1 << priv->msg_obj_rx_num) - 1;

Here you're casting the 1 to 64bit, but msg_obj_rx_mask is only u32. Use
"1UL", if you are sure that rx_mask would never exceed 32 bit.

Marc

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