linux-kernel - Re: [PATCH] Staging: quatech_usb2: fix coding style issues

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Message-ID: <6797ac6e1003310134y9c333y1fc6811032b2f174@mail.gmail.com>
Date:	Wed, 31 Mar 2010 10:34:20 +0200
From:	Søren Møller <soerenmoeller2001@...il.com>
To:	Joe Perches <joe@...ches.com>
Cc:	gregkh@...e.de, richard@...acityteam.org, andre.goddard@...il.com,
	nm127@...email.hu, devel@...verdev.osuosl.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Staging: quatech_usb2: fix coding style issues

2010/3/30 Joe Perches <joe@...ches.com>
>
> On Tue, 2010-03-30 at 20:11 +0000, Soeren Moeller wrote:
> > This is a patch to the file quatech_usb2.c that fixes two space before tabular and one line of more than 80 characters warnings found by checkpatch.pl
> > -                             tty_insert_flip_string(tty_st,
> > -                                     &((unsigned char *)(urb->transfer_buffer)
> > -                                             )[i],
> > -                                     1);
> > +                             tty_insert_flip_string(tty_st, &(
> > +                                             (unsigned char *)
> > +                                             (urb->transfer_buffer)
> > +                                     )[i], 1);
>
> I think this is unsightly.
> Perhaps a macro instead?
>

The macro seems like a good idea, it makes the code a lot more readable.
Thanks for your response

Regards
Sören Möller

> Signed-off-by: Joe Perches <joe@...ches.com>
> ---
>  drivers/staging/quatech_usb2/quatech_usb2.c |   17 +++++++++--------
>  1 files changed, 9 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/staging/quatech_usb2/quatech_usb2.c b/drivers/staging/quatech_usb2/quatech_usb2.c
> index 1561f74..d14792a 100644
> --- a/drivers/staging/quatech_usb2/quatech_usb2.c
> +++ b/drivers/staging/quatech_usb2/quatech_usb2.c
> @@ -109,12 +109,15 @@ static int debug;
>  #define  QT2_LINE_STATUS_REGISTER       0x05
>  #define  QT2_MODEM_STATUS_REGISTER      0x06
>
> +/* handy macro for extracting a byte from a data read transfer buffer */
> +#define URB_TBUF(urb, pos) (((unsigned char *)(urb->transfer_buffer))[pos])
> +
>  /* handy macros for doing escape sequence parsing on data reads */
> -#define THISCHAR       ((unsigned char *)(urb->transfer_buffer))[i]
> -#define NEXTCHAR       ((unsigned char *)(urb->transfer_buffer))[i + 1]
> -#define THIRDCHAR      ((unsigned char *)(urb->transfer_buffer))[i + 2]
> -#define FOURTHCHAR     ((unsigned char *)(urb->transfer_buffer))[i + 3]
> -#define FIFTHCHAR      ((unsigned char *)(urb->transfer_buffer))[i + 4]
> +#define THISCHAR       URB_TBUF(urb, i + 0)
> +#define NEXTCHAR       URB_TBUF(urb, i + 1)
> +#define THIRDCHAR      URB_TBUF(urb, i + 2)
> +#define FOURTHCHAR     URB_TBUF(urb, i + 3)
> +#define FIFTHCHAR      URB_TBUF(urb, i + 4)
>
>  static const struct usb_device_id quausb2_id_table[] = {
>        {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_SSU2_100)},
> @@ -1649,9 +1652,7 @@ __func__);
>                        if (tty_st && urb->actual_length) {
>                                tty_buffer_request_room(tty_st, 1);
>                                tty_insert_flip_string(tty_st,
> -                                       &((unsigned char *)(urb->transfer_buffer)
> -                                               )[i],
> -                                       1);
> +                                                      &URB_TBUF(urb, i), 1);
>                        }
>                } /*endfor*/
>                tty_flip_buffer_push(tty_st);
>
>
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