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@xxxxxxxxx/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@xxxxxxxxx> 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
