[rafael-pm:linux-next 20/23] drivers/pci/pci-acpi.c:1127:12: warning: 'adev' is used uninitialized

[rafael-pm:linux-next 20/23] drivers/pci/pci-acpi.c:1127:12: warning: 'adev' is used uninitialized

[kernel test robot]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git linux-next
head:   5264d800ffd532b515f32ad3a3439b5611438157
commit: 9896a58cdd59a6454adeebbe10a881b05550e63a [20/23] PCI: ACPI: PM: Do not use pci_platform_pm_ops for ACPI
config: ia64-randconfig-r031-20210928 (attached as .config)
compiler: ia64-linux-gcc (GCC) 11.2.0
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://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git/commit/?id=9896a58cdd59a6454adeebbe10a881b05550e63a
        git remote add rafael-pm https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git
        git fetch --no-tags rafael-pm linux-next
        git checkout 9896a58cdd59a6454adeebbe10a881b05550e63a
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=ia64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

   In file included from arch/ia64/include/asm/pgtable.h:153,
                    from include/linux/pgtable.h:6,
                    from arch/ia64/include/asm/uaccess.h:40,
                    from include/linux/uaccess.h:11,
                    from arch/ia64/include/asm/sections.h:11,
                    from include/linux/interrupt.h:21,
                    from include/linux/pci.h:38,
                    from drivers/pci/pci-acpi.c:13:
   arch/ia64/include/asm/mmu_context.h: In function 'reload_context':
   arch/ia64/include/asm/mmu_context.h:127:48: warning: variable 'old_rr4' set but not used [-Wunused-but-set-variable]
     127 |         unsigned long rr0, rr1, rr2, rr3, rr4, old_rr4;
         |                                                ^~~~~~~
   drivers/pci/pci-acpi.c: In function 'acpi_pci_need_resume':
>> drivers/pci/pci-acpi.c:1127:12: warning: 'adev' is used uninitialized [-Wuninitialized]
    1127 |         if (!adev || !acpi_device_power_manageable(adev))
         |            ^


vim +/adev +1127 drivers/pci/pci-acpi.c

b67ea76172d4b19 Rafael J. Wysocki 2010-02-17  1109  
9896a58cdd59a64 Rafael J. Wysocki 2021-09-20  1110  bool acpi_pci_need_resume(struct pci_dev *dev)
bac2a909a096c91 Rafael J. Wysocki 2015-01-21  1111  {
9896a58cdd59a64 Rafael J. Wysocki 2021-09-20  1112  	struct acpi_device *adev;
9896a58cdd59a64 Rafael J. Wysocki 2021-09-20  1113  
9896a58cdd59a64 Rafael J. Wysocki 2021-09-20  1114  	if (acpi_pci_disabled)
9896a58cdd59a64 Rafael J. Wysocki 2021-09-20  1115  		return false;
bac2a909a096c91 Rafael J. Wysocki 2015-01-21  1116  
26112ddc254c986 Rafael J. Wysocki 2018-06-30  1117  	/*
26112ddc254c986 Rafael J. Wysocki 2018-06-30  1118  	 * In some cases (eg. Samsung 305V4A) leaving a bridge in suspend over
26112ddc254c986 Rafael J. Wysocki 2018-06-30  1119  	 * system-wide suspend/resume confuses the platform firmware, so avoid
9d64b539b738fc1 Rafael J. Wysocki 2018-08-16  1120  	 * doing that.  According to Section 16.1.6 of ACPI 6.2, endpoint
26112ddc254c986 Rafael J. Wysocki 2018-06-30  1121  	 * devices are expected to be in D3 before invoking the S3 entry path
26112ddc254c986 Rafael J. Wysocki 2018-06-30  1122  	 * from the firmware, so they should not be affected by this issue.
26112ddc254c986 Rafael J. Wysocki 2018-06-30  1123  	 */
9d64b539b738fc1 Rafael J. Wysocki 2018-08-16  1124  	if (pci_is_bridge(dev) && acpi_target_system_state() != ACPI_STATE_S0)
26112ddc254c986 Rafael J. Wysocki 2018-06-30  1125  		return true;
26112ddc254c986 Rafael J. Wysocki 2018-06-30  1126  
bac2a909a096c91 Rafael J. Wysocki 2015-01-21 @1127  	if (!adev || !acpi_device_power_manageable(adev))
bac2a909a096c91 Rafael J. Wysocki 2015-01-21  1128  		return false;
bac2a909a096c91 Rafael J. Wysocki 2015-01-21  1129  
9896a58cdd59a64 Rafael J. Wysocki 2021-09-20  1130  	adev = ACPI_COMPANION(&dev->dev);
9a51c6b1f9e0239 Rafael J. Wysocki 2019-05-16  1131  	if (adev->wakeup.flags.valid &&
9a51c6b1f9e0239 Rafael J. Wysocki 2019-05-16  1132  	    device_may_wakeup(&dev->dev) != !!adev->wakeup.prepare_count)
bac2a909a096c91 Rafael J. Wysocki 2015-01-21  1133  		return true;
bac2a909a096c91 Rafael J. Wysocki 2015-01-21  1134  
bac2a909a096c91 Rafael J. Wysocki 2015-01-21  1135  	if (acpi_target_system_state() == ACPI_STATE_S0)
bac2a909a096c91 Rafael J. Wysocki 2015-01-21  1136  		return false;
bac2a909a096c91 Rafael J. Wysocki 2015-01-21  1137  
bac2a909a096c91 Rafael J. Wysocki 2015-01-21  1138  	return !!adev->power.flags.dsw_present;
bac2a909a096c91 Rafael J. Wysocki 2015-01-21  1139  }
bac2a909a096c91 Rafael J. Wysocki 2015-01-21  1140  

:::::: The code at line 1127 was first introduced by commit
:::::: bac2a909a096c9110525c18cbb8ce73c660d5f71 PCI / PM: Avoid resuming PCI devices during system suspend

:::::: TO: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
:::::: CC: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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