Re: [PATCH v2] PCI/PM: Avoid suspending the device with errors

[kernel test robot <lkp@intel.com>]

Hi Raag,

kernel test robot noticed the following build errors:

[auto build test ERROR on pci/next]
[also build test ERROR on pci/for-linus linus/master v6.15-rc3 next-20250422]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Raag-Jadav/PCI-PM-Avoid-suspending-the-device-with-errors/20250422-215734
base:   https://git.kernel.org/pub/scm/linux/kernel/git/pci/pci.git next
patch link:    https://lore.kernel.org/r/20250422135341.2780925-1-raag.jadav%40intel.com
patch subject: [PATCH v2] PCI/PM: Avoid suspending the device with errors
config: i386-defconfig (https://download.01.org/0day-ci/archive/20250423/202504230757.wEJUX3v6-lkp@intel.com/config)
compiler: clang version 20.1.2 (https://github.com/llvm/llvm-project 58df0ef89dd64126512e4ee27b4ac3fd8ddf6247)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250423/202504230757.wEJUX3v6-lkp@intel.com/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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202504230757.wEJUX3v6-lkp@intel.com/

All errors (new ones prefixed by >>):

>> drivers/pci/pci-driver.c:887:7: error: call to undeclared function 'pci_aer_in_progress'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     887 |         if (!pci_aer_in_progress(pci_dev) && !pci_dev->state_saved) {
         |              ^
   1 error generated.


vim +/pci_aer_in_progress +887 drivers/pci/pci-driver.c

   851	
   852	static int pci_pm_suspend_noirq(struct device *dev)
   853	{
   854		struct pci_dev *pci_dev = to_pci_dev(dev);
   855		const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
   856	
   857		if (dev_pm_skip_suspend(dev))
   858			return 0;
   859	
   860		if (pci_has_legacy_pm_support(pci_dev))
   861			return pci_legacy_suspend_late(dev);
   862	
   863		if (!pm) {
   864			pci_save_state(pci_dev);
   865			goto Fixup;
   866		}
   867	
   868		if (pm->suspend_noirq) {
   869			pci_power_t prev = pci_dev->current_state;
   870			int error;
   871	
   872			error = pm->suspend_noirq(dev);
   873			suspend_report_result(dev, pm->suspend_noirq, error);
   874			if (error)
   875				return error;
   876	
   877			if (!pci_dev->state_saved && pci_dev->current_state != PCI_D0
   878			    && pci_dev->current_state != PCI_UNKNOWN) {
   879				pci_WARN_ONCE(pci_dev, pci_dev->current_state != prev,
   880					      "PCI PM: State of device not saved by %pS\n",
   881					      pm->suspend_noirq);
   882				goto Fixup;
   883			}
   884		}
   885	
   886		/* Avoid suspending the device with errors */
 > 887		if (!pci_aer_in_progress(pci_dev) && !pci_dev->state_saved) {
   888			pci_save_state(pci_dev);
   889	
   890			/*
   891			 * If the device is a bridge with a child in D0 below it,
   892			 * it needs to stay in D0, so check skip_bus_pm to avoid
   893			 * putting it into a low-power state in that case.
   894			 */
   895			if (!pci_dev->skip_bus_pm && pci_power_manageable(pci_dev))
   896				pci_prepare_to_sleep(pci_dev);
   897		}
   898	
   899		pci_dbg(pci_dev, "PCI PM: Suspend power state: %s\n",
   900			pci_power_name(pci_dev->current_state));
   901	
   902		if (pci_dev->current_state == PCI_D0) {
   903			pci_dev->skip_bus_pm = true;
   904			/*
   905			 * Per PCI PM r1.2, table 6-1, a bridge must be in D0 if any
   906			 * downstream device is in D0, so avoid changing the power state
   907			 * of the parent bridge by setting the skip_bus_pm flag for it.
   908			 */
   909			if (pci_dev->bus->self)
   910				pci_dev->bus->self->skip_bus_pm = true;
   911		}
   912	
   913		if (pci_dev->skip_bus_pm && pm_suspend_no_platform()) {
   914			pci_dbg(pci_dev, "PCI PM: Skipped\n");
   915			goto Fixup;
   916		}
   917	
   918		pci_pm_set_unknown_state(pci_dev);
   919	
   920		/*
   921		 * Some BIOSes from ASUS have a bug: If a USB EHCI host controller's
   922		 * PCI COMMAND register isn't 0, the BIOS assumes that the controller
   923		 * hasn't been quiesced and tries to turn it off.  If the controller
   924		 * is already in D3, this can hang or cause memory corruption.
   925		 *
   926		 * Since the value of the COMMAND register doesn't matter once the
   927		 * device has been suspended, we can safely set it to 0 here.
   928		 */
   929		if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI)
   930			pci_write_config_word(pci_dev, PCI_COMMAND, 0);
   931	
   932	Fixup:
   933		pci_fixup_device(pci_fixup_suspend_late, pci_dev);
   934	
   935		/*
   936		 * If the target system sleep state is suspend-to-idle, it is sufficient
   937		 * to check whether or not the device's wakeup settings are good for
   938		 * runtime PM.  Otherwise, the pm_resume_via_firmware() check will cause
   939		 * pci_pm_complete() to take care of fixing up the device's state
   940		 * anyway, if need be.
   941		 */
   942		if (device_can_wakeup(dev) && !device_may_wakeup(dev))
   943			dev->power.may_skip_resume = false;
   944	
   945		return 0;
   946	}
   947	

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