linux-kernel - Re: [PATCH v3 3/3] Staging: iio: adc: ad7280a.c: Fixed Macro argument reuse

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Date:   Sat, 22 Jul 2017 21:37:26 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Jaya Durga <rjdurga@...il.com>
Cc:     gregkh@...uxfoundation.org, lars@...afoo.de,
        Michael.Hennerich@...log.com, knaack.h@....de, pmeerw@...erw.net,
        linux-iio@...r.kernel.org, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 3/3] Staging: iio: adc: ad7280a.c: Fixed Macro
 argument reuse

On Wed, 19 Jul 2017 17:55:57 +0530
Jaya Durga <rjdurga@...il.com> wrote:

> CHECK: Macro argument reuse 'addr' - possible side-effects?
> 
> convert AD7280A_DEVADDR to ad7280a_devaddr static function
> to fix checkpath check
> 
> v3: small style changes
> 
> Signed-off-by: Jaya Durga <rjdurga@...il.com>

This patch is fine so I've applied it to the togreg branch
of iio.git which will be initially pushed out as testing
for the autobuilders to play with it.

Just as an aside there was no connection between the 3 patches
in this series.  As such, what was the point in making them
a series?  If you aren't either working on one driver,
or applying the same change to a set of drivers, please don't
combine patches into a series of random unconnected patches.

Jonathan
> ---
>  drivers/staging/iio/adc/ad7280a.c | 21 +++++++++++++--------
>  1 file changed, 13 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/staging/iio/adc/ad7280a.c b/drivers/staging/iio/adc/ad7280a.c
> index d5ab83f..f85dde9 100644
> --- a/drivers/staging/iio/adc/ad7280a.c
> +++ b/drivers/staging/iio/adc/ad7280a.c
> @@ -99,9 +99,14 @@
>  #define AD7280A_DEVADDR_MASTER		0
>  #define AD7280A_DEVADDR_ALL		0x1F
>  /* 5-bit device address is sent LSB first */
> -#define AD7280A_DEVADDR(addr)	(((addr & 0x1) << 4) | ((addr & 0x2) << 3) | \
> -				(addr & 0x4) | ((addr & 0x8) >> 3) | \
> -				((addr & 0x10) >> 4))
> +static unsigned int ad7280a_devaddr(unsigned int addr)
> +{
> +	return ((addr & 0x1) << 4) |
> +	       ((addr & 0x2) << 3) |
> +	       (addr & 0x4) |
> +	       ((addr & 0x8) >> 3) |
> +	       ((addr & 0x10) >> 4);
> +}
>  
>  /* During a read a valid write is mandatory.
>   * So writing to the highest available address (Address 0x1F)
> @@ -372,7 +377,7 @@ static int ad7280_chain_setup(struct ad7280_state *st)
>  		if (ad7280_check_crc(st, val))
>  			return -EIO;
>  
> -		if (n != AD7280A_DEVADDR(val >> 27))
> +		if (n != ad7280a_devaddr(val >> 27))
>  			return -EIO;
>  	}
>  
> @@ -511,7 +516,7 @@ static int ad7280_channel_init(struct ad7280_state *st)
>  			st->channels[cnt].info_mask_shared_by_type =
>  				BIT(IIO_CHAN_INFO_SCALE);
>  			st->channels[cnt].address =
> -				AD7280A_DEVADDR(dev) << 8 | ch;
> +				ad7280a_devaddr(dev) << 8 | ch;
>  			st->channels[cnt].scan_index = cnt;
>  			st->channels[cnt].scan_type.sign = 'u';
>  			st->channels[cnt].scan_type.realbits = 12;
> @@ -558,7 +563,7 @@ static int ad7280_attr_init(struct ad7280_state *st)
>  		for (ch = AD7280A_CELL_VOLTAGE_1; ch <= AD7280A_CELL_VOLTAGE_6;
>  			ch++, cnt++) {
>  			st->iio_attr[cnt].address =
> -				AD7280A_DEVADDR(dev) << 8 | ch;
> +				ad7280a_devaddr(dev) << 8 | ch;
>  			st->iio_attr[cnt].dev_attr.attr.mode =
>  				0644;
>  			st->iio_attr[cnt].dev_attr.show =
> @@ -574,7 +579,7 @@ static int ad7280_attr_init(struct ad7280_state *st)
>  				&st->iio_attr[cnt].dev_attr.attr;
>  			cnt++;
>  			st->iio_attr[cnt].address =
> -				AD7280A_DEVADDR(dev) << 8 |
> +				ad7280a_devaddr(dev) << 8 |
>  				(AD7280A_CB1_TIMER + ch);
>  			st->iio_attr[cnt].dev_attr.attr.mode =
>  				0644;
> @@ -918,7 +923,7 @@ static int ad7280_probe(struct spi_device *spi)
>  		if (ret)
>  			goto error_unregister;
>  
> -		ret = ad7280_write(st, AD7280A_DEVADDR(st->slave_num),
> +		ret = ad7280_write(st, ad7280a_devaddr(st->slave_num),
>  				   AD7280A_ALERT, 0,
>  				   AD7280A_ALERT_GEN_STATIC_HIGH |
>  				   (pdata->chain_last_alert_ignore & 0xF));