linux-kernel - Re: [PATCH v2 06/11] staging: pi433: Split rf69_set_crc

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Date:   Wed, 6 Dec 2017 12:37:03 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Marcus Wolf <marcus.wolf@...rthome-wolf.de>
Cc:     Simon Sandström <simon@...anor.nu>,
        gregkh@...uxfoundation.org, devel@...verdev.osuosl.org,
        linux@...f-Entwicklungen.de, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 06/11] staging: pi433: Split rf69_set_crc_enabled into
 two functions

On Wed, Dec 06, 2017 at 11:05:22AM +0200, Marcus Wolf wrote:
> 
> 
> Am 06.12.2017 um 00:08 schrieb Simon Sandström:
> > Splits rf69_set_crc_enabled(dev, enabled) into
> > rf69_enable_crc(dev) and rf69_disable_crc(dev).
> > 
> > Signed-off-by: Simon Sandström <simon@...anor.nu>
> > ---
> >   drivers/staging/pi433/pi433_if.c | 22 ++++++++++++++++++++--
> >   drivers/staging/pi433/rf69.c     | 18 ++++++------------
> >   drivers/staging/pi433/rf69.h     |  4 ++--
> >   3 files changed, 28 insertions(+), 16 deletions(-)
> > 
> > diff --git a/drivers/staging/pi433/pi433_if.c b/drivers/staging/pi433/pi433_if.c
> > index 2ae19ac565d1..614eec7dd904 100644
> > --- a/drivers/staging/pi433/pi433_if.c
> > +++ b/drivers/staging/pi433/pi433_if.c
> > @@ -216,7 +216,16 @@ rf69_set_rx_cfg(struct pi433_device *dev, struct pi433_rx_cfg *rx_cfg)
> >   			return ret;
> >   	}
> >   	SET_CHECKED(rf69_set_adressFiltering(dev->spi, rx_cfg->enable_address_filtering));
> > -	SET_CHECKED(rf69_set_crc_enable	    (dev->spi, rx_cfg->enable_crc));
> > +
> > +	if (rx_cfg->enable_crc == OPTION_ON) {
> > +		ret = rf69_enable_crc(dev->spi);
> > +		if (ret < 0)
> > +			return ret;
> > +	} else {
> > +		ret = rf69_disable_crc(dev->spi);
> > +		if (ret < 0)
> > +			return ret;
> > +	}
> 
> Why don't you use SET_CHECKED(...)?
> 

Marcus, please don't introduce new uses of SET_CHECKED().  It has a
hidden return in it which is against kernel style and introduces very
predictable and avoidable bugs.  For example, in probe().

> I stil don't like this kind of changes - and not using SET_CHECKED makes it
> even worse, since that further increases code length.
> 
> The idea was to have the configuration as compact, as you can see in the
> receiver config section. It's a pitty that the packet config already needs
> such a huge number of exceptions due to technical reasons. We shouldn't
> further extend the numbers of exceptions and shouldn't extend the number of
> lines for setting a reg.
> 
> Initially this function was just like
> set_rx_cfg()
> {
>     SET_CHECKED(...)
>     SET_CHECKED(...)
>     SET_CHECKED(...)
>     SET_CHECKED(...)
> }
> 
> It should be easy,
> * to survey, which chip settings are touched, if set_rx_cfg is called.
> * to survey, that all params of the rx_cfg struct are taken care of.
> 
> The longer the function gets, the harder it is, to service it.
> I really would be happy, if we don't go this way.
> 
> 
> Anyway, please keep the naming convention of rf69.c:
> 
> rf69 -set/get - action
> -> rf69_set_crc_enable

No...  Simon's name is better.  His is shorter and makes more sense.  :(

regards,
dan carpenter