Hi Li-hao, I love your patch! Perhaps something to improve: [auto build test WARNING on next-20220204] url: https://github.com/0day-ci/linux/commits/Li-hao-Kuo/spi-Modify-irq-reques... base: ef6b35306dd8f15a7e5e5a2532e665917a43c5d9 config: x86_64-buildonly-randconfig-r001-20220207 (https://download.01.org/0day-ci/archive/20220208/202202080613.XIxdHpD0-lk...) compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 0d8850ae2cae85d49bea6ae0799fa41c7202c05c) reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # https://github.com/0day-ci/linux/commit/5c25f7d844a49fd90f5f830136a1423a5... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Li-hao-Kuo/spi-Modify-irq-request-position-and-modify-parameters/20220207-095850 git checkout 5c25f7d844a49fd90f5f830136a1423a51dfa3e6 # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash drivers/spi/ If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): default: ^~~~~~~ drivers/spi/spi-sunplus-sp7021.c:414:9: note: uninitialized use occurs here return ret; ^~~ drivers/spi/spi-sunplus-sp7021.c:378:15: note: initialize the variable 'ret' to silence this warning int mode, ret; ^ = 0 1 warning generated. Kconfig warnings: (for reference only) WARNING: unmet direct dependencies detected for OMAP_GPMC Depends on MEMORY && OF_ADDRESS Selected by - MTD_NAND_OMAP2 && MTD && MTD_RAW_NAND && (ARCH_OMAP2PLUS || ARCH_KEYSTONE || ARCH_K3 || COMPILE_TEST && HAS_IOMEM vim +/ret +405 drivers/spi/spi-sunplus-sp7021.c f62ca4e2a86303 Li-hao Kuo 2022-01-18 372 f62ca4e2a86303 Li-hao Kuo 2022-01-18 373 static int sp7021_spi_slave_transfer_one(struct spi_controller *ctlr, struct spi_device *spi, f62ca4e2a86303 Li-hao Kuo 2022-01-18 374 struct spi_transfer *xfer) f62ca4e2a86303 Li-hao Kuo 2022-01-18 375 { f62ca4e2a86303 Li-hao Kuo 2022-01-18 376 struct sp7021_spi_ctlr *pspim = spi_master_get_devdata(ctlr); f62ca4e2a86303 Li-hao Kuo 2022-01-18 377 struct device *dev = pspim->dev; 5c25f7d844a49f Li-hao Kuo 2022-02-07 378 int mode, ret; f62ca4e2a86303 Li-hao Kuo 2022-01-18 379 f62ca4e2a86303 Li-hao Kuo 2022-01-18 380 mode = SP7021_SPI_IDLE; f62ca4e2a86303 Li-hao Kuo 2022-01-18 381 if (xfer->tx_buf && xfer->rx_buf) { f62ca4e2a86303 Li-hao Kuo 2022-01-18 382 dev_dbg(&ctlr->dev, "%s() wrong command\n", __func__); 5c25f7d844a49f Li-hao Kuo 2022-02-07 383 return -EINVAL; f62ca4e2a86303 Li-hao Kuo 2022-01-18 384 } else if (xfer->tx_buf) { f62ca4e2a86303 Li-hao Kuo 2022-01-18 385 xfer->tx_dma = dma_map_single(dev, (void *)xfer->tx_buf, f62ca4e2a86303 Li-hao Kuo 2022-01-18 386 xfer->len, DMA_TO_DEVICE); f62ca4e2a86303 Li-hao Kuo 2022-01-18 387 if (dma_mapping_error(dev, xfer->tx_dma)) f62ca4e2a86303 Li-hao Kuo 2022-01-18 388 return -ENOMEM; f62ca4e2a86303 Li-hao Kuo 2022-01-18 389 mode = SP7021_SLAVE_WRITE; f62ca4e2a86303 Li-hao Kuo 2022-01-18 390 } else if (xfer->rx_buf) { f62ca4e2a86303 Li-hao Kuo 2022-01-18 391 xfer->rx_dma = dma_map_single(dev, xfer->rx_buf, xfer->len, f62ca4e2a86303 Li-hao Kuo 2022-01-18 392 DMA_FROM_DEVICE); f62ca4e2a86303 Li-hao Kuo 2022-01-18 393 if (dma_mapping_error(dev, xfer->rx_dma)) f62ca4e2a86303 Li-hao Kuo 2022-01-18 394 return -ENOMEM; f62ca4e2a86303 Li-hao Kuo 2022-01-18 395 mode = SP7021_SLAVE_READ; f62ca4e2a86303 Li-hao Kuo 2022-01-18 396 } f62ca4e2a86303 Li-hao Kuo 2022-01-18 397 f62ca4e2a86303 Li-hao Kuo 2022-01-18 398 switch (mode) { f62ca4e2a86303 Li-hao Kuo 2022-01-18 399 case SP7021_SLAVE_WRITE: f62ca4e2a86303 Li-hao Kuo 2022-01-18 400 ret = sp7021_spi_slave_tx(spi, xfer); f62ca4e2a86303 Li-hao Kuo 2022-01-18 401 break; f62ca4e2a86303 Li-hao Kuo 2022-01-18 402 case SP7021_SLAVE_READ: f62ca4e2a86303 Li-hao Kuo 2022-01-18 403 ret = sp7021_spi_slave_rx(spi, xfer); f62ca4e2a86303 Li-hao Kuo 2022-01-18 404 break; f62ca4e2a86303 Li-hao Kuo 2022-01-18 @405 default: f62ca4e2a86303 Li-hao Kuo 2022-01-18 406 break; f62ca4e2a86303 Li-hao Kuo 2022-01-18 407 } f62ca4e2a86303 Li-hao Kuo 2022-01-18 408 if (xfer->tx_buf) f62ca4e2a86303 Li-hao Kuo 2022-01-18 409 dma_unmap_single(dev, xfer->tx_dma, xfer->len, DMA_TO_DEVICE); f62ca4e2a86303 Li-hao Kuo 2022-01-18 410 if (xfer->rx_buf) f62ca4e2a86303 Li-hao Kuo 2022-01-18 411 dma_unmap_single(dev, xfer->rx_dma, xfer->len, DMA_FROM_DEVICE); f62ca4e2a86303 Li-hao Kuo 2022-01-18 412 f62ca4e2a86303 Li-hao Kuo 2022-01-18 413 spi_finalize_current_transfer(ctlr); f62ca4e2a86303 Li-hao Kuo 2022-01-18 414 return ret; f62ca4e2a86303 Li-hao Kuo 2022-01-18 415 } f62ca4e2a86303 Li-hao Kuo 2022-01-18 416 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org