[linux-next:master 923/1853] drivers/spi/spi-s3c64xx.c:357:34: sparse: sparse: Using plain integer as NULL pointer

[linux-next:master 923/1853] drivers/spi/spi-s3c64xx.c:357:34: sparse: sparse: Using plain integer as NULL pointer

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   03c312cc5f473c220fd2c80f7f5d32ed24005dd4
commit: f52b03c707444c5a3d1a0b9c5724f93ddc3c588e [923/1853] spi: s3c64xx: requests spi-dma channel only during data transfer
config: arm64-randconfig-s032-20220605 (https://download.01.org/0day-ci/archive/20220608/202206081502.jlwKFxtv-lkp@intel.com/config)
compiler: aarch64-linux-gcc (GCC) 11.3.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # apt-get install sparse
        # sparse version: v0.6.4-26-gb3cf30ba-dirty
        # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=f52b03c707444c5a3d1a0b9c5724f93ddc3c588e
        git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
        git fetch --no-tags linux-next master
        git checkout f52b03c707444c5a3d1a0b9c5724f93ddc3c588e
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=arm64 SHELL=/bin/bash drivers/spi/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@intel.com>


sparse warnings: (new ones prefixed by >>)
>> drivers/spi/spi-s3c64xx.c:357:34: sparse: sparse: Using plain integer as NULL pointer
   drivers/spi/spi-s3c64xx.c:365:34: sparse: sparse: Using plain integer as NULL pointer
   drivers/spi/spi-s3c64xx.c:366:34: sparse: sparse: Using plain integer as NULL pointer
   drivers/spi/spi-s3c64xx.c:811:34: sparse: sparse: Using plain integer as NULL pointer
   drivers/spi/spi-s3c64xx.c:812:34: sparse: sparse: Using plain integer as NULL pointer

vim +357 drivers/spi/spi-s3c64xx.c

   345	
   346	static int s3c64xx_spi_prepare_transfer(struct spi_master *spi)
   347	{
   348		struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(spi);
   349	
   350		if (is_polling(sdd))
   351			return 0;
   352	
   353		/* Requests DMA channels */
   354		sdd->rx_dma.ch = dma_request_chan(&sdd->pdev->dev, "rx");
   355		if (IS_ERR(sdd->rx_dma.ch)) {
   356			dev_err(&sdd->pdev->dev, "Failed to get RX DMA channel\n");
 > 357			sdd->rx_dma.ch = 0;
   358			return 0;
   359		}
   360	
   361		sdd->tx_dma.ch = dma_request_chan(&sdd->pdev->dev, "tx");
   362		if (IS_ERR(sdd->tx_dma.ch)) {
   363			dev_err(&sdd->pdev->dev, "Failed to get TX DMA hannel\n");
   364			dma_release_channel(sdd->rx_dma.ch);
   365			sdd->tx_dma.ch = 0;
   366			sdd->rx_dma.ch = 0;
   367			return 0;
   368		}
   369	
   370		spi->dma_rx = sdd->rx_dma.ch;
   371		spi->dma_tx = sdd->tx_dma.ch;
   372	
   373		return 0;
   374	}
   375	

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp