linux-kernel - Re: [PATCH] staging: comedi: Fix incorrect type assignment

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Date:   Wed, 8 Feb 2017 13:13:44 +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] staging: comedi: Fix incorrect type assignment

On 07/02/17 19:06, Karthik Nayak wrote:
> This patch fixes the following sparse error:
> drivers/staging/comedi/drivers//ni_pcimio.c:1229:32: warning: incorrect type in assignment (different base types)
> drivers/staging/comedi/drivers//ni_pcimio.c:1229:32:    expected restricted __be32 [usertype] serial_number
> drivers/staging/comedi/drivers//ni_pcimio.c:1229:32:    got unsigned int
>
> This is done by introducing a temporary variable which is of type
> '__be32' and converting the existing variable to type 'unsigned int'.
>
> Signed-off-by: Karthik Nayak <Karthik.188@...il.com>
> ---
>  drivers/staging/comedi/drivers/ni_pcimio.c | 5 +++--
>  drivers/staging/comedi/drivers/ni_stc.h    | 2 +-
>  2 files changed, 4 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/staging/comedi/drivers/ni_pcimio.c b/drivers/staging/comedi/drivers/ni_pcimio.c
> index cdb66eab1292..4f45a5c230ad 100644
> --- a/drivers/staging/comedi/drivers/ni_pcimio.c
> +++ b/drivers/staging/comedi/drivers/ni_pcimio.c
> @@ -1207,6 +1207,7 @@ static void m_series_init_eeprom_buffer(struct comedi_device *dev)
>  	unsigned int old_iodwbsr_bits;
>  	unsigned int old_iodwbsr1_bits;
>  	unsigned int old_iodwcr1_bits;
> +	__be32 serial_number;
>  	int i;
>
>  	/* IO Window 1 needs to be temporarily mapped to read the eeprom */
> @@ -1223,10 +1224,10 @@ static void m_series_init_eeprom_buffer(struct comedi_device *dev)
>
>  	BUG_ON(serial_number_eeprom_length > sizeof(devpriv->serial_number));
>  	for (i = 0; i < serial_number_eeprom_length; ++i) {
> -		char *byte_ptr = (char *)&devpriv->serial_number + i;
> +		char *byte_ptr = (char *)&serial_number + i;
>  		*byte_ptr = ni_readb(dev, serial_number_eeprom_offset + i);
>  	}
> -	devpriv->serial_number = be32_to_cpu(devpriv->serial_number);
> +	devpriv->serial_number = be32_to_cpu(serial_number);
>
>  	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 f27b545f83eb..b5eca0da71eb 100644
> --- a/drivers/staging/comedi/drivers/ni_stc.h
> +++ b/drivers/staging/comedi/drivers/ni_stc.h
> @@ -1031,7 +1031,7 @@ struct ni_private {
>
>  	unsigned short ai_fifo_buffer[0x2000];
>  	u8 eeprom_buffer[M_SERIES_EEPROM_SIZE];
> -	__be32 serial_number;
> +	unsigned int serial_number;
>
>  	struct mite *mite;
>  	struct mite_channel *ai_mite_chan;
>

That looks fine, thanks!

(On a side note, nothing actually uses serial number, so the code that 
reads it from the EEPROM could just be ripped out.)

Reviewed-by: Ian Abbott <abbotti@....co.uk>

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