linux-kernel - Re: [PATCH V5 6/8] USB: f81232: clarify f81232

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Date:	Fri, 06 Feb 2015 15:21:07 +0300
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Peter Hung <hpeter@...il.com>, johan@...nel.org
CC:	gregkh@...uxfoundation.org, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org, tom_tsai@...tek.com.tw,
	peter_hong@...tek.com.tw,
	Peter Hung <hpeter+linux_kernel@...il.com>
Subject: Re: [PATCH V5 6/8] USB: f81232: clarify f81232_ioctl()

Hello.

On 2/6/2015 12:46 PM, Peter Hung wrote:

> We extract TIOCGSERIAL section in f81232_ioctl() to f81232_get_serial_info()
> to make it clarify

    You're also changing 'ser.baud_rate' from 460800 to 115200. And explicitly 
overriding some previously initialized to 0 fields.

> The f81232_set_mctrl() replace set_control_lines() to do MCR control
> so we clean-up the set_control_lines() function.

    I don't see where are you doing this...

> Signed-off-by: Peter Hung <hpeter+linux_kernel@...il.com>
> ---
>   drivers/usb/serial/f81232.c | 34 +++++++++++++++++++++++-----------
>   1 file changed, 23 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/usb/serial/f81232.c b/drivers/usb/serial/f81232.c
> index e1cdf42..4dddb44 100644
> --- a/drivers/usb/serial/f81232.c
> +++ b/drivers/usb/serial/f81232.c
> @@ -516,24 +516,36 @@ static int f81232_carrier_raised(struct usb_serial_port *port)
>   	return 0;
>   }
>
> +static int f81232_get_serial_info(struct usb_serial_port *port,
> +		unsigned long arg)
> +{
> +	struct serial_struct ser;
> +
> +	memset(&ser, 0, sizeof(ser));
> +
> +	ser.flags		= ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
> +	ser.xmit_fifo_size	= port->bulk_out_size;
> +	ser.close_delay		= 5 * HZ;
> +	ser.closing_wait	= 30 * HZ;
> +	ser.type = PORT_16550A;
> +	ser.line = port->minor;
> +	ser.port = port->port_number;
> +	ser.baud_base = 115200;
> +
> +	if (copy_to_user((void __user *)arg, &ser, sizeof(ser)))
> +		return -EFAULT;
> +
> +	return 0;
> +}
> +
>   static int f81232_ioctl(struct tty_struct *tty,
>   			unsigned int cmd, unsigned long arg)
>   {
> -	struct serial_struct ser;
>   	struct usb_serial_port *port = tty->driver_data;
>
>   	switch (cmd) {
>   	case TIOCGSERIAL:
> -		memset(&ser, 0, sizeof ser);
> -		ser.type = PORT_16654;
> -		ser.line = port->minor;
> -		ser.port = port->port_number;
> -		ser.baud_base = 460800;
> -
> -		if (copy_to_user((void __user *)arg, &ser, sizeof ser))
> -			return -EFAULT;
> -
> -		return 0;
> +		return f81232_get_serial_info(port, arg);
>   	default:
>   		break;
>   	}

WBR, Sergei

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