linux-kernel - Re: [PATCH 2/2] staging: comedi: drop unused variable from struct 'ni

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Date:   Wed, 8 Feb 2017 17:40:56 +0000
From:   Ian Abbott <abbotti@....co.uk>
To:     Karthik Nayak <karthik.188@...il.com>, linux-kernel@...r.kernel.org
Cc:     devel@...verdev.osuosl.org, hsweeten@...ionengravers.com,
        kastolom@...il.com, gregkh@...uxfoundation.org
Subject: Re: [PATCH 2/2] staging: comedi: drop unused variable from struct
 'ni_private'

On 08/02/2017 16:55, Karthik Nayak wrote:
> Drop the 'serial_number' variable from the struct 'ni_private' since
> its never used after assignment.
>
> Signed-off-by: Karthik Nayak <Karthik.188@...il.com>
> ---
>
> This is to be based on top of "staging: comedi: Fix incorrect type assignment"
> to which this is replied to.
>
>  drivers/staging/comedi/drivers/ni_pcimio.c | 3 +--
>  drivers/staging/comedi/drivers/ni_stc.h    | 1 -
>  2 files changed, 1 insertion(+), 3 deletions(-)
>
> diff --git a/drivers/staging/comedi/drivers/ni_pcimio.c b/drivers/staging/comedi/drivers/ni_pcimio.c
> index 4f45a5c230ad..da4d3da071eb 100644
> --- a/drivers/staging/comedi/drivers/ni_pcimio.c
> +++ b/drivers/staging/comedi/drivers/ni_pcimio.c
> @@ -1222,12 +1222,11 @@ static void m_series_init_eeprom_buffer(struct comedi_device *dev)
>  	writel(0x1 | old_iodwcr1_bits, mite->mmio + MITE_IODWCR_1);
>  	writel(0xf, mite->mmio + 0x30);
>

I think it would be preferable to remove the code from here ...

> -	BUG_ON(serial_number_eeprom_length > sizeof(devpriv->serial_number));
> +	BUG_ON(serial_number_eeprom_length > sizeof(serial_number));
>  	for (i = 0; i < serial_number_eeprom_length; ++i) {
>  		char *byte_ptr = (char *)&serial_number + i;
>  		*byte_ptr = ni_readb(dev, serial_number_eeprom_offset + i);
>  	}
> -	devpriv->serial_number = be32_to_cpu(serial_number);

... to here.  And remove the serial_number_eeprom_length, 
serial_number_eeprom_offset, and serial_number variables too.  There is 
no need to continue reading the serial number bytes from the EEPROM.

>
>  	for (i = 0; i < M_SERIES_EEPROM_SIZE; ++i)
>  		devpriv->eeprom_buffer[i] = ni_readb(dev, Start_Cal_EEPROM + i);
> diff --git a/drivers/staging/comedi/drivers/ni_stc.h b/drivers/staging/comedi/drivers/ni_stc.h
> index b5eca0da71eb..61138e86a455 100644
> --- a/drivers/staging/comedi/drivers/ni_stc.h
> +++ b/drivers/staging/comedi/drivers/ni_stc.h
> @@ -1031,7 +1031,6 @@ struct ni_private {
>
>  	unsigned short ai_fifo_buffer[0x2000];
>  	u8 eeprom_buffer[M_SERIES_EEPROM_SIZE];
> -	unsigned int serial_number;
>
>  	struct mite *mite;
>  	struct mite_channel *ai_mite_chan;
>

-- 
-=( Ian Abbott @ MEV Ltd.    E-mail: <abbotti@....co.uk> )=-
-=(                          Web: http://www.mev.co.uk/  )=-