linux-kernel - Re: [PATCH 25/50] mos7720: switch to ->get

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Date:   Fri, 14 Sep 2018 16:02:47 +0200
From:   Johan Hovold <johan@...nel.org>
To:     Al Viro <viro@...IV.linux.org.uk>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 25/50] mos7720: switch to ->get_serial()

On Thu, Sep 13, 2018 at 03:40:24AM +0100, Al Viro wrote:
> From: Al Viro <viro@...iv.linux.org.uk>
> 
> Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
> ---
>  drivers/usb/serial/mos7720.c | 38 ++++++++++++++++----------------------
>  1 file changed, 16 insertions(+), 22 deletions(-)
> 
> diff --git a/drivers/usb/serial/mos7720.c b/drivers/usb/serial/mos7720.c
> index 4c06357b3ef8..451fca707e04 100644
> --- a/drivers/usb/serial/mos7720.c
> +++ b/drivers/usb/serial/mos7720.c
> @@ -1786,24 +1786,22 @@ static int mos7720_tiocmset(struct tty_struct *tty,
>  	return 0;
>  }
>  
> -static int get_serial_info(struct moschip_port *mos7720_port,
> -			   struct serial_struct __user *retinfo)
> +static int get_serial_info(struct tty_struct *tty,
> +			   struct serial_struct *ss)
>  {
> -	struct serial_struct tmp;
> -
> -	memset(&tmp, 0, sizeof(tmp));
> -
> -	tmp.type		= PORT_16550A;
> -	tmp.line		= mos7720_port->port->minor;
> -	tmp.port		= mos7720_port->port->port_number;
> -	tmp.irq			= 0;
> -	tmp.xmit_fifo_size	= NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
> -	tmp.baud_base		= 9600;
> -	tmp.close_delay		= 5*HZ;
> -	tmp.closing_wait	= 30*HZ;
> -
> -	if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
> -		return -EFAULT;
> +	struct usb_serial_port *port = tty->driver_data;
> +	struct moschip_port *mos7720_port;

Newline please.

> +	mos7720_port = usb_get_serial_port_data(port);
> +	if (mos7720_port == NULL)
> +		return -ENODEV;

And no need to check for NULL, even if the current ioctl does so...

> +	ss->type		= PORT_16550A;
> +	ss->line		= mos7720_port->port->minor;
> +	ss->port		= mos7720_port->port->port_number;
> +	ss->irq			= 0;
> +	ss->xmit_fifo_size	= NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
> +	ss->baud_base		= 9600;
> +	ss->close_delay		= 5*HZ;
> +	ss->closing_wait	= 30*HZ;
>  	return 0;
>  }

Reviewed-by: Johan Hovold <johan@...nel.org>