linux-kernel - Re: [PATCH v2 05/15] spi: Remove code duplication in spi_add_device

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Message-ID: <ZK03rBqoQ0IZz617@smile.fi.intel.com>
Date:   Tue, 11 Jul 2023 14:06:20 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Mark Brown <broonie@...nel.org>,
        Sebastian Reichel <sebastian.reichel@...labora.com>
Cc:     Cristian Ciocaltea <cristian.ciocaltea@...labora.com>,
        Yang Yingliang <yangyingliang@...wei.com>,
        Amit Kumar Mahapatra via Alsa-devel 
        <alsa-devel@...a-project.org>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Tharun Kumar P <tharunkumar.pasumarthi@...rochip.com>,
        Vijaya Krishna Nivarthi <quic_vnivarth@...cinc.com>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>, linux-spi@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-amlogic@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-arm-msm@...r.kernel.org,
        linux-rockchip@...ts.infradead.org,
        linux-riscv@...ts.infradead.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-trace-kernel@...r.kernel.org, netdev@...r.kernel.org,
        Sanjay R Mehta <sanju.mehta@....com>,
        Radu Pirea <radu_nicolae.pirea@....ro>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Claudiu Beznea <claudiu.beznea@...rochip.com>,
        Tudor Ambarus <tudor.ambarus@...aro.org>,
        Serge Semin <fancer.lancer@...il.com>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Kevin Hilman <khilman@...libre.com>,
        Jerome Brunet <jbrunet@...libre.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
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        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
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        Alain Volmat <alain.volmat@...s.st.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Max Filippov <jcmvbkbc@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
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        Richard Cochran <richardcochran@...il.com>
Subject: Re: [PATCH v2 05/15] spi: Remove code duplication in
 spi_add_device_locked()

On Mon, Jul 10, 2023 at 06:16:22PM +0100, Mark Brown wrote:
> On Mon, Jul 10, 2023 at 06:49:22PM +0300, Andy Shevchenko wrote:
> > Seems by unknown reason, probably some kind of mis-rebase,
> > the commit 0c79378c0199 ("spi: add ancillary device support")
> > adds a dozen of duplicating lines of code. Drop them.
> > 
> > Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> > ---
> >  drivers/spi/spi.c | 11 -----------
> >  1 file changed, 11 deletions(-)
> > 
> > diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
> > index c99ee4164f11..46cbda383228 100644
> > --- a/drivers/spi/spi.c
> > +++ b/drivers/spi/spi.c
> > @@ -712,17 +712,6 @@ EXPORT_SYMBOL_GPL(spi_add_device);
> >  static int spi_add_device_locked(struct spi_device *spi)
> >  {
> >  	struct spi_controller *ctlr = spi->controller;
> > -	struct device *dev = ctlr->dev.parent;
> > -
> > -	/* Chipselects are numbered 0..max; validate. */
> > -	if (spi_get_chipselect(spi, 0) >= ctlr->num_chipselect) {
> > -		dev_err(dev, "cs%d >= max %d\n", spi_get_chipselect(spi, 0),
> > -			ctlr->num_chipselect);
> > -		return -EINVAL;
> > -	}
> > -
> > -	/* Set the bus ID string */
> > -	spi_dev_set_name(spi);
> 
> I see that this is duplicating spi_add_device() (and we really could do
> better with code sharing there I think) but I can't immediately see
> where the duplication that's intended to be elimiated is here - where
> else in the one call path that spi_add_device_locked() has would we do
> the above?  Based on the changelog I was expecting to see some
> duplicated code in the function itself.

Oh, by some reason Sebastian wasn't in this rather long Cc list.
Added him.

Reading again I don't see any useful explanation why that piece of code has to
be duplicated among these two functions. It's 100% a copy.

Sebastian, can you shed some light here?

-- 
With Best Regards,
Andy Shevchenko