Re: [PATCH v7 4/4] spi: cadence: Add MRVL overlay xfer operation support

[Dan Carpenter <dan.carpenter@xxxxxxxxxx>]

Hi Witold,

kernel test robot noticed the following build warnings:

https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Witold-Sadowski/spi-dt-bindings-cadence-Add-Marvell-overlay-bindings-documentation-for-Cadence-XSPI/20240530-060250
base:   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git for-next
patch link:    https://lore.kernel.org/r/20240529220026.1644986-5-wsadowski%40marvell.com
patch subject: [PATCH v7 4/4] spi: cadence: Add MRVL overlay xfer operation support
config: powerpc64-randconfig-r071-20240531 (https://download.01.org/0day-ci/archive/20240602/202406020007.yDo5EI4r-lkp@xxxxxxxxx/config)
compiler: clang version 19.0.0git (https://github.com/llvm/llvm-project bafda89a0944d947fc4b3b5663185e07a397ac30)

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@xxxxxxxxx>
| Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
| Closes: https://lore.kernel.org/r/202406020007.yDo5EI4r-lkp@xxxxxxxxx/

New smatch warnings:
drivers/spi/spi-cadence-xspi.c:955 cdns_xspi_stig_ready() warn: signedness bug returning '(-110)'
drivers/spi/spi-cadence-xspi.c:967 cdns_xspi_sdma_ready() warn: signedness bug returning '(-110)'

vim +955 drivers/spi/spi-cadence-xspi.c

66e19aa5a2e022b Witold Sadowski 2024-05-29  951  static bool cdns_xspi_stig_ready(struct cdns_xspi_dev *cdns_xspi, bool sleep)
66e19aa5a2e022b Witold Sadowski 2024-05-29  952  {
66e19aa5a2e022b Witold Sadowski 2024-05-29  953  	u32 ctrl_stat;
66e19aa5a2e022b Witold Sadowski 2024-05-29  954  
66e19aa5a2e022b Witold Sadowski 2024-05-29 @955  	return readl_relaxed_poll_timeout
66e19aa5a2e022b Witold Sadowski 2024-05-29  956  		(cdns_xspi->iobase + CDNS_XSPI_CTRL_STATUS_REG,
66e19aa5a2e022b Witold Sadowski 2024-05-29  957  		ctrl_stat,
66e19aa5a2e022b Witold Sadowski 2024-05-29  958  		((ctrl_stat & BIT(3)) == 0),
66e19aa5a2e022b Witold Sadowski 2024-05-29  959  		sleep ? MRVL_XSPI_POLL_DELAY_US : 0,
66e19aa5a2e022b Witold Sadowski 2024-05-29  960  		sleep ? MRVL_XSPI_POLL_TIMEOUT_US : 0);

This works but from the name you would expect it to return true when
it's ready and false when it's not.

66e19aa5a2e022b Witold Sadowski 2024-05-29  961  }
66e19aa5a2e022b Witold Sadowski 2024-05-29  962  
66e19aa5a2e022b Witold Sadowski 2024-05-29  963  static bool cdns_xspi_sdma_ready(struct cdns_xspi_dev *cdns_xspi, bool sleep)
66e19aa5a2e022b Witold Sadowski 2024-05-29  964  {
66e19aa5a2e022b Witold Sadowski 2024-05-29  965  	u32 ctrl_stat;
66e19aa5a2e022b Witold Sadowski 2024-05-29  966  
66e19aa5a2e022b Witold Sadowski 2024-05-29 @967  	return readl_relaxed_poll_timeout
66e19aa5a2e022b Witold Sadowski 2024-05-29  968  		(cdns_xspi->iobase + CDNS_XSPI_INTR_STATUS_REG,
66e19aa5a2e022b Witold Sadowski 2024-05-29  969  		ctrl_stat,
66e19aa5a2e022b Witold Sadowski 2024-05-29  970  		(ctrl_stat & CDNS_XSPI_SDMA_TRIGGER),
66e19aa5a2e022b Witold Sadowski 2024-05-29  971  		sleep ? MRVL_XSPI_POLL_DELAY_US : 0,
66e19aa5a2e022b Witold Sadowski 2024-05-29  972  		sleep ? MRVL_XSPI_POLL_TIMEOUT_US : 0);
66e19aa5a2e022b Witold Sadowski 2024-05-29  973  }

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