[ambarus:spi-nor/next 1/15] drivers/spi/atmel-quadspi.c:1202 atmel_qspi_dma_init() warn: passing zero to 'PTR_ERR'

[Dan Carpenter]

tree:   https://github.com/ambarus/linux-0day spi-nor/next
head:   038b3fa2d89f1a00fdb8767704cdb799a0fe746b
commit: ff51c966a3c5144ae964797349747e680ee47c3a [1/15] spi: atmel-quadspi: Add support for sama7g5 QSPI
config: openrisc-randconfig-m031-20220210 (https://download.01.org/0day-ci/archive/20220211/202202110830.1OGwXRWt-lkp@xxxxxxxxx/config)
compiler: or1k-linux-gcc (GCC) 11.2.0

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>

smatch warnings:
drivers/spi/atmel-quadspi.c:1202 atmel_qspi_dma_init() warn: passing zero to 'PTR_ERR'

vim +/PTR_ERR +1202 drivers/spi/atmel-quadspi.c

ff51c966a3c514 drivers/spi/atmel-quadspi.c         Tudor Ambarus   2020-10-19  1194  static int atmel_qspi_dma_init(struct spi_controller *ctrl)
ff51c966a3c514 drivers/spi/atmel-quadspi.c         Tudor Ambarus   2020-10-19  1195  {
ff51c966a3c514 drivers/spi/atmel-quadspi.c         Tudor Ambarus   2020-10-19  1196  	struct atmel_qspi *aq = spi_controller_get_devdata(ctrl);
ff51c966a3c514 drivers/spi/atmel-quadspi.c         Tudor Ambarus   2020-10-19  1197  	int ret;
ff51c966a3c514 drivers/spi/atmel-quadspi.c         Tudor Ambarus   2020-10-19  1198  
ff51c966a3c514 drivers/spi/atmel-quadspi.c         Tudor Ambarus   2020-10-19  1199  	aq->rx_chan = dma_request_chan(&aq->pdev->dev, "rx");
ff51c966a3c514 drivers/spi/atmel-quadspi.c         Tudor Ambarus   2020-10-19  1200  	if (IS_ERR(aq->rx_chan)) {
ff51c966a3c514 drivers/spi/atmel-quadspi.c         Tudor Ambarus   2020-10-19  1201  		aq->rx_chan = NULL;

Need to preserve the error code before setting this to NULL

ff51c966a3c514 drivers/spi/atmel-quadspi.c         Tudor Ambarus   2020-10-19 @1202  		return dev_err_probe(&aq->pdev->dev, PTR_ERR(aq->rx_chan),
ff51c966a3c514 drivers/spi/atmel-quadspi.c         Tudor Ambarus   2020-10-19  1203  				     "RX DMA channel is not available\n");

This will return success.

ff51c966a3c514 drivers/spi/atmel-quadspi.c         Tudor Ambarus   2020-10-19  1204  	}
ff51c966a3c514 drivers/spi/atmel-quadspi.c         Tudor Ambarus   2020-10-19  1205  
ff51c966a3c514 drivers/spi/atmel-quadspi.c         Tudor Ambarus   2020-10-19  1206  	aq->tx_chan = dma_request_chan(&aq->pdev->dev, "tx");
ff51c966a3c514 drivers/spi/atmel-quadspi.c         Tudor Ambarus   2020-10-19  1207  	if (IS_ERR(aq->tx_chan)) {
ff51c966a3c514 drivers/spi/atmel-quadspi.c         Tudor Ambarus   2020-10-19  1208  		ret = dev_err_probe(&aq->pdev->dev, PTR_ERR(aq->tx_chan),
ff51c966a3c514 drivers/spi/atmel-quadspi.c         Tudor Ambarus   2020-10-19  1209  				    "TX DMA channel is not available\n");
ff51c966a3c514 drivers/spi/atmel-quadspi.c         Tudor Ambarus   2020-10-19  1210  		goto release_rx_chan;
ff51c966a3c514 drivers/spi/atmel-quadspi.c         Tudor Ambarus   2020-10-19  1211  	}
ff51c966a3c514 drivers/spi/atmel-quadspi.c         Tudor Ambarus   2020-10-19  1212  
ff51c966a3c514 drivers/spi/atmel-quadspi.c         Tudor Ambarus   2020-10-19  1213  	ctrl->dma_rx = aq->rx_chan;
ff51c966a3c514 drivers/spi/atmel-quadspi.c         Tudor Ambarus   2020-10-19  1214  	ctrl->dma_tx = aq->tx_chan;
ff51c966a3c514 drivers/spi/atmel-quadspi.c         Tudor Ambarus   2020-10-19  1215  	init_completion(&aq->dma_completion);
ff51c966a3c514 drivers/spi/atmel-quadspi.c         Tudor Ambarus   2020-10-19  1216  
ff51c966a3c514 drivers/spi/atmel-quadspi.c         Tudor Ambarus   2020-10-19  1217  	dev_info(&aq->pdev->dev, "Using %s (tx) and %s (rx) for DMA transfers\n",
ff51c966a3c514 drivers/spi/atmel-quadspi.c         Tudor Ambarus   2020-10-19  1218  		 dma_chan_name(aq->tx_chan), dma_chan_name(aq->rx_chan));
ff51c966a3c514 drivers/spi/atmel-quadspi.c         Tudor Ambarus   2020-10-19  1219  
ff51c966a3c514 drivers/spi/atmel-quadspi.c         Tudor Ambarus   2020-10-19  1220  	return 0;
ff51c966a3c514 drivers/spi/atmel-quadspi.c         Tudor Ambarus   2020-10-19  1221  
ff51c966a3c514 drivers/spi/atmel-quadspi.c         Tudor Ambarus   2020-10-19  1222  release_rx_chan:
ff51c966a3c514 drivers/spi/atmel-quadspi.c         Tudor Ambarus   2020-10-19  1223  	dma_release_channel(aq->rx_chan);
ff51c966a3c514 drivers/spi/atmel-quadspi.c         Tudor Ambarus   2020-10-19  1224  	aq->rx_chan = NULL;
ff51c966a3c514 drivers/spi/atmel-quadspi.c         Tudor Ambarus   2020-10-19  1225  	aq->tx_chan = NULL;
ff51c966a3c514 drivers/spi/atmel-quadspi.c         Tudor Ambarus   2020-10-19  1226  	return ret;
ff51c966a3c514 drivers/spi/atmel-quadspi.c         Tudor Ambarus   2020-10-19  1227  }

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