Re: [PATCH v1 1/4] iio: adc: ad4000: Add support for SPI offload

[Dan Carpenter <dan.carpenter@linaro.org>]

Hi Marcelo,

kernel test robot noticed the following build warnings:

url:    https://github.com/intel-lab-lkp/linux/commits/Marcelo-Schmitt/iio-adc-ad4000-Add-support-for-SPI-offload/20250315-012316
base:   af94f401e26f686f7391ce79b38a6129417c22dc
patch link:    https://lore.kernel.org/r/301fc83a961c4a2ef2ac980d0baa83d9d89a88c5.1741970538.git.marcelo.schmitt%40analog.com
patch subject: [PATCH v1 1/4] iio: adc: ad4000: Add support for SPI offload
config: parisc-randconfig-r072-20250316 (https://download.01.org/0day-ci/archive/20250316/202503161513.yeRBTxjg-lkp@intel.com/config)
compiler: hppa-linux-gcc (GCC) 14.2.0

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
| Closes: https://lore.kernel.org/r/202503161513.yeRBTxjg-lkp@intel.com/

New smatch warnings:
drivers/iio/adc/ad4000.c:862 ad4000_spi_offload_setup() warn: passing zero to 'PTR_ERR'

vim +/PTR_ERR +862 drivers/iio/adc/ad4000.c

e74205e82803041 Marcelo Schmitt 2025-03-14  846  static int ad4000_spi_offload_setup(struct iio_dev *indio_dev,
e74205e82803041 Marcelo Schmitt 2025-03-14  847  				    struct ad4000_state *st)
e74205e82803041 Marcelo Schmitt 2025-03-14  848  {
e74205e82803041 Marcelo Schmitt 2025-03-14  849  	struct spi_device *spi = st->spi;
e74205e82803041 Marcelo Schmitt 2025-03-14  850  	struct device *dev = &spi->dev;
e74205e82803041 Marcelo Schmitt 2025-03-14  851  	struct dma_chan *rx_dma;
e74205e82803041 Marcelo Schmitt 2025-03-14  852  	int ret;
e74205e82803041 Marcelo Schmitt 2025-03-14  853  
e74205e82803041 Marcelo Schmitt 2025-03-14  854  	st->offload_trigger = devm_spi_offload_trigger_get(dev, st->offload,
e74205e82803041 Marcelo Schmitt 2025-03-14  855  							   SPI_OFFLOAD_TRIGGER_PERIODIC);
e74205e82803041 Marcelo Schmitt 2025-03-14  856  	if (IS_ERR(st->offload_trigger))
e74205e82803041 Marcelo Schmitt 2025-03-14  857  		return dev_err_probe(dev, PTR_ERR(st->offload_trigger),
e74205e82803041 Marcelo Schmitt 2025-03-14  858  				     "Failed to get offload trigger\n");
e74205e82803041 Marcelo Schmitt 2025-03-14  859  
e74205e82803041 Marcelo Schmitt 2025-03-14  860  	ret = ad4000_set_sampling_freq(st, st->max_rate_hz);
e74205e82803041 Marcelo Schmitt 2025-03-14  861  	if (ret)
e74205e82803041 Marcelo Schmitt 2025-03-14 @862  		return dev_err_probe(dev, PTR_ERR(st->offload_trigger),

s/PTR_ERR(st->offload_trigger)/ret/

e74205e82803041 Marcelo Schmitt 2025-03-14  863  				     "Failed to set sampling frequency\n");
e74205e82803041 Marcelo Schmitt 2025-03-14  864  
e74205e82803041 Marcelo Schmitt 2025-03-14  865  	rx_dma = devm_spi_offload_rx_stream_request_dma_chan(dev, st->offload);
e74205e82803041 Marcelo Schmitt 2025-03-14  866  	if (IS_ERR(rx_dma))
e74205e82803041 Marcelo Schmitt 2025-03-14  867  		return dev_err_probe(dev, PTR_ERR(rx_dma),
e74205e82803041 Marcelo Schmitt 2025-03-14  868  				     "Failed to get offload RX DMA\n");
e74205e82803041 Marcelo Schmitt 2025-03-14  869  
e74205e82803041 Marcelo Schmitt 2025-03-14  870  	ret = devm_iio_dmaengine_buffer_setup_with_handle(dev, indio_dev, rx_dma,
e74205e82803041 Marcelo Schmitt 2025-03-14  871  							  IIO_BUFFER_DIRECTION_IN);
e74205e82803041 Marcelo Schmitt 2025-03-14  872  	if (ret)
e74205e82803041 Marcelo Schmitt 2025-03-14  873  		return dev_err_probe(dev, ret, "Failed to setup DMA buffer\n");
e74205e82803041 Marcelo Schmitt 2025-03-14  874  
e74205e82803041 Marcelo Schmitt 2025-03-14  875  	return 0;
e74205e82803041 Marcelo Schmitt 2025-03-14  876  }

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