netdev - Re: [PATCH] can: usb: f81604: add Fintek F81604 support

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Date:   Mon, 20 Mar 2023 10:59:33 +0800
From:   Peter Hong <peter_hong@...tek.com.tw>
To:     Michal Swiatkowski <michal.swiatkowski@...ux.intel.com>
CC:     <wg@...ndegger.com>, <mkl@...gutronix.de>, <davem@...emloft.net>,
        <edumazet@...gle.com>, <kuba@...nel.org>, <pabeni@...hat.com>,
        <mailhol.vincent@...adoo.fr>, <frank.jungclaus@....eu>,
        <linux-kernel@...r.kernel.org>, <linux-can@...r.kernel.org>,
        <netdev@...r.kernel.org>, <hpeter+linux_kernel@...il.com>
Subject: Re: [PATCH] can: usb: f81604: add Fintek F81604 support

Hi,

Michal Swiatkowski 於 2023/3/17 下午 09:15 寫道:
> On Fri, Mar 17, 2023 at 05:33:52PM +0800, Ji-Ze Hong (Peter Hong) wrote:
>
> --- a/drivers/net/can/usb/Kconfig
> +++ b/drivers/net/can/usb/Kconfig
> @@ -147,4 +147,13 @@ config CAN_UCAN
>   	          from Theobroma Systems like the A31-ÂľQ7 and the RK3399-Q7
>   	          (https://www.theobroma-systems.com/rk3399-q7)
>   
> Hi,
>
> I am not familiar with CAN, so only style review :)

Thanks for your reviews :D
> +
> +	if (status) {
> +		dev_err(&dev->dev, "%s: reg: %x data: %x failed: %d\n",
> +			__func__, reg, data, status);
> +	}
> The { and } aren't needed as inside if is only one line.

Could I remove the { and } when the logical line to split multi-line ?

>> +static int f81604_set_normal_mode(struct net_device *netdev)
>> +{
>> +	struct f81604_port_priv *priv = netdev_priv(netdev);
>> +	int status, i;
>> +	u8 mod_reg_val = 0x00;
> RCT, mod_reg should be one line above

What mean about "RCT"?

Is this section should change to above like ??

     u8 mod_reg_val;
     ...

     mod_reg_val = 0;
>> +static int f81604_register_urbs(struct net_device *netdev)
>> +{
>> +	struct f81604_port_priv *priv = netdev_priv(netdev);
>> +	int status, i;
>> +
>> +	for (i = 0; i < F81604_MAX_RX_URBS; ++i) {
>> +		status = usb_submit_urb(priv->read_urb[i], GFP_KERNEL);
>> +		if (status) {
>> +			netdev_warn(netdev, "%s: submit rx urb failed: %d\n",
>> +				    __func__, status);
>> +			return status;
> Don't know usb subsytem, but shouldn't previously submitted urb be
> killed?

Yes, I had made kill operations in
     f81604_start()
         -> f81604_unregister_urbs()

>> +static void f81604_process_rx_packet(struct urb *urb)
>> +{
>> +	struct net_device_stats *stats;
>> +	struct net_device *netdev;
>> +	struct can_frame *cf;
>> +	struct sk_buff *skb;
>> +	u8 *data;
>> +	u8 *ptr;
>> +	int i;
>> +	int count;
> RCT
>
>> +
>> +	netdev = urb->context;
>> +	stats = &netdev->stats;
>> +	data = urb->transfer_buffer;
> netdev and data can be set in declaration

why only netdev & data ?? Could I set netdev, stats & data in declaration ?


>> +/* Called by the usb core when driver is unloaded or device is removed */
>> +static void f81604_disconnect(struct usb_interface *intf)
>> +{
>> +	struct f81604_priv *priv = usb_get_intfdata(intf);
>> +	int i;
>> +
>> +	for (i = 0; i < F81604_MAX_DEV; ++i) {
>> +		if (!priv->netdev[i])
>> +			continue;
>> +
>> +		unregister_netdev(priv->netdev[i]);
>> +		free_candev(priv->netdev[i]);
>> +	}
> What about closing USB device? It is called brefore disconnect or it
> should be done here?

When candev close in f81604_close(), It will call f81604_set_reset_mode() to
make candev to reset mode.

Thanks