drivers/pci/pci.c:4195 pci_pio_to_address() warn: unsigned 'pio' is never less than zero.

[kernel test robot]

Hi Bjorn,

FYI, the error/warning was bisected to this commit, please ignore it if it's irrelevant.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   0bb80ecc33a8fb5a682236443c1e740d5c917d1d
commit: 3b59ca944687b8651849f51b15c23e3fdbf07394 PCI: Simplify pci_pio_to_address()
date:   2 weeks ago
config: openrisc-randconfig-r071-20230906 (https://download.01.org/0day-ci/archive/20230912/202309120432.dJjt8xMp-lkp@xxxxxxxxx/config)
compiler: or1k-linux-gcc (GCC) 13.2.0
reproduce: (https://download.01.org/0day-ci/archive/20230912/202309120432.dJjt8xMp-lkp@xxxxxxxxx/reproduce)

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>
| Closes: https://lore.kernel.org/oe-kbuild-all/202309120432.dJjt8xMp-lkp@xxxxxxxxx/

smatch warnings:
drivers/pci/pci.c:4195 pci_pio_to_address() warn: unsigned 'pio' is never less than zero.

vim +/pio +4195 drivers/pci/pci.c

  4191	
  4192	phys_addr_t pci_pio_to_address(unsigned long pio)
  4193	{
  4194	#ifdef PCI_IOBASE
> 4195		if (pio < MMIO_UPPER_LIMIT)
  4196			return logic_pio_to_hwaddr(pio);
  4197	#endif
  4198	
  4199		return (phys_addr_t) OF_BAD_ADDR;
  4200	}
  4201	EXPORT_SYMBOL_GPL(pci_pio_to_address);
  4202	

-- 
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https://github.com/intel/lkp-tests/wiki