linux-kernel - drivers/pci/pci.c:4195 pci_pio_to_address() warn: always true condition '(pio >= (0

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Message-ID: <202209211647.5COmF7fM-lkp@intel.com>
Date:   Wed, 21 Sep 2022 16:09:42 +0800
From:   kernel test robot <lkp@...el.com>
To:     Stafford Horne <shorne@...il.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org
Subject: drivers/pci/pci.c:4195 pci_pio_to_address() warn: always true
 condition '(pio >= (0 - 0)) => (0-u32max >= 0)'

Hi Stafford,

First bad commit (maybe != root cause):

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   60891ec99e141b74544d11e897a245ef06263052
commit: ded2ee36313c941f1a12b6f85cde295b575264ae openrisc: Add pci bus support
date:   8 weeks ago
config: openrisc-randconfig-m041-20220919 (https://download.01.org/0day-ci/archive/20220921/202209211647.5COmF7fM-lkp@intel.com/config)
compiler: or1k-linux-gcc (GCC) 12.1.0

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

smatch warnings:
drivers/pci/pci.c:4195 pci_pio_to_address() warn: always true condition '(pio >= (0 - 0)) => (0-u32max >= 0)'
drivers/media/pci/cx23885/cx23885-dvb.c:2579 dvb_register() error: we previously assumed 'fe1->dvb.frontend' could be null (see line 1743)

vim +4195 drivers/pci/pci.c

c5076cfe768998 Tomasz Nowicki 2016-05-11  4189  
c5076cfe768998 Tomasz Nowicki 2016-05-11  4190  phys_addr_t pci_pio_to_address(unsigned long pio)
c5076cfe768998 Tomasz Nowicki 2016-05-11  4191  {
c5076cfe768998 Tomasz Nowicki 2016-05-11  4192  	phys_addr_t address = (phys_addr_t)OF_BAD_ADDR;
c5076cfe768998 Tomasz Nowicki 2016-05-11  4193  
c5076cfe768998 Tomasz Nowicki 2016-05-11  4194  #ifdef PCI_IOBASE
5745392e0c2b78 Zhichang Yuan  2018-03-15 @4195  	if (pio >= MMIO_UPPER_LIMIT)
c5076cfe768998 Tomasz Nowicki 2016-05-11  4196  		return address;
c5076cfe768998 Tomasz Nowicki 2016-05-11  4197  
5745392e0c2b78 Zhichang Yuan  2018-03-15  4198  	address = logic_pio_to_hwaddr(pio);
c5076cfe768998 Tomasz Nowicki 2016-05-11  4199  #endif
c5076cfe768998 Tomasz Nowicki 2016-05-11  4200  
c5076cfe768998 Tomasz Nowicki 2016-05-11  4201  	return address;
c5076cfe768998 Tomasz Nowicki 2016-05-11  4202  }
9cc742078c9a90 Jianjun Wang   2021-04-20  4203  EXPORT_SYMBOL_GPL(pci_pio_to_address);
c5076cfe768998 Tomasz Nowicki 2016-05-11  4204  

:::::: The code at line 4195 was first introduced by commit
:::::: 5745392e0c2b78e0d73203281d5c42cbd6993194 PCI: Apply the new generic I/O management on PCI IO hosts

:::::: TO: Zhichang Yuan <yuanzhichang@...ilicon.com>
:::::: CC: Bjorn Helgaas <helgaas@...nel.org>

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