linux-kernel - Re: [PATCH v5 3/3] drivers: iio: adc: add support for ad777x family

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Message-ID: <20240914174815.4084f90f@jic23-huawei>
Date: Sat, 14 Sep 2024 17:48:15 +0100
From: Jonathan Cameron <jic23@...nel.org>
To: kernel test robot <lkp@...el.com>
Cc: Ramona Alexandra Nechita <ramona.nechita@...log.com>, Lars-Peter Clausen
 <lars@...afoo.de>, Cosmin Tanislav <cosmin.tanislav@...log.com>, Michael
 Hennerich <Michael.Hennerich@...log.com>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk@...nel.org>, Conor Dooley <conor+dt@...nel.org>,
 Nuno Sa <nuno.sa@...log.com>, Andy Shevchenko <andy@...nel.org>, David
 Lechner <dlechner@...libre.com>, Marcelo Schmitt
 <marcelo.schmitt@...log.com>, Olivier Moysan <olivier.moysan@...s.st.com>,
 Dumitru Ceclan <mitrutzceclan@...il.com>, Matteo Martelli
 <matteomartelli3@...il.com>, AngeloGioacchino Del Regno
 <angelogioacchino.delregno@...labora.com>, Alisa-Dariana Roman
 <alisadariana@...il.com>, Ivan Mikhaylov <fr0st61te@...il.com>, Mike
 Looijmans <mike.looijmans@...ic.nl>, linux-iio@...r.kernel.org,
 linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
 llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev
Subject: Re: [PATCH v5 3/3] drivers: iio: adc: add support for ad777x family

skip "nr_"
>          |                               ~~~~~~~~~~~ ^ ~~~
> >> drivers/iio/adc/ad7779.c:748:35: warning: variable 'ret' is uninitialized when used here [-Wuninitialized]  
>      748 |                 return dev_err_probe(&spi->dev, ret,
>          |                                                 ^~~
>    drivers/iio/adc/ad7779.c:735:9: note: initialize the variable 'ret' to silence this warning
>      735 |         int ret;
>          |                ^
>          |                 = 0
Definitely don't do that!

just replace ret with -EINVAL

Jonathan

>    8 warnings generated.
> 
> 
> vim +/ret +748 drivers/iio/adc/ad7779.c
> 
>    729	
>    730	static int ad7779_probe(struct spi_device *spi)
>    731	{
>    732		struct iio_dev *indio_dev;
>    733		struct ad7779_state *st;
>    734		struct gpio_desc *reset_gpio, *start_gpio;
>    735		int ret;
>    736	
>    737		indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
>    738		if (!indio_dev)
>    739			return -ENOMEM;
>    740	
>    741		st = iio_priv(indio_dev);
>    742	
>    743		st->mclk = devm_clk_get_enabled(&spi->dev, "mclk");
>    744		if (IS_ERR(st->mclk))
>    745			return PTR_ERR(st->mclk);
>    746	
>    747		if (!spi->irq)
>  > 748			return dev_err_probe(&spi->dev, ret,  
>    749					     "DRDY irq not present\n");
>    750