linux-kernel - Re: [PATCH 5/6] PCI / ACPI / PM: Avoid disabling wakeup for bridges too early

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Date:   Tue, 20 Jun 2017 20:38:04 +0800
From:   kbuild test robot <lkp@...el.com>
To:     "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:     kbuild-all@...org, Linux PM <linux-pm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux PCI <linux-pci@...r.kernel.org>,
        Linux ACPI <linux-acpi@...r.kernel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH 5/6] PCI / ACPI / PM: Avoid disabling wakeup for bridges
 too early

Hi Rafael,

[auto build test WARNING on pm/linux-next]
[also build test WARNING on next-20170620]
[cannot apply to v4.12-rc6]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Rafael-J-Wysocki/PM-Unify-the-handling-of-device-wakeup-settings/20170620-195729
base:   https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git linux-next
config: x86_64-randconfig-x019-201725 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

Note: it may well be a FALSE warning. FWIW you are at least aware of it now.
http://gcc.gnu.org/wiki/Better_Uninitialized_Warnings

All warnings (new ones prefixed by >>):

   drivers/acpi/device_pm.c: In function '__acpi_pm_device_wakeup':
>> drivers/acpi/device_pm.c:735:6: warning: 'error' may be used uninitialized in this function [-Wmaybe-uninitialized]
     int error;
         ^~~~~

vim +/error +735 drivers/acpi/device_pm.c

235d81a6 Rafael J. Wysocki 2017-06-12  719  	} else if (adev->wakeup.flags.enabled) {
dee8370c Rafael J. Wysocki 2012-11-02  720  		acpi_disable_gpe(wakeup->gpe_device, wakeup->gpe_number);
dee8370c Rafael J. Wysocki 2012-11-02  721  		acpi_disable_wakeup_device_power(adev);
235d81a6 Rafael J. Wysocki 2017-06-12  722  		adev->wakeup.flags.enabled = 0;
dee8370c Rafael J. Wysocki 2012-11-02  723  	}
dee8370c Rafael J. Wysocki 2012-11-02  724  	return 0;
dee8370c Rafael J. Wysocki 2012-11-02  725  }
dee8370c Rafael J. Wysocki 2012-11-02  726  
dee8370c Rafael J. Wysocki 2012-11-02  727  /**
6909f7ad Rafael J. Wysocki 2017-06-19  728   * __acpi_pm_device_wakeup - Enable/disable remote wakeup for given device.
9f7d805b Rafael J. Wysocki 2017-06-19  729   * @dev: Device to enable/disable to generate wakeup events.
dee8370c Rafael J. Wysocki 2012-11-02  730   * @enable: Whether to enable or disable the wakeup functionality.
cd7bd02d Rafael J. Wysocki 2012-11-02  731   */
6909f7ad Rafael J. Wysocki 2017-06-19  732  int __acpi_pm_device_wakeup(struct device *dev, bool enable, bool refcount)
a6ae7594 Rafael J. Wysocki 2012-11-02  733  {
a6ae7594 Rafael J. Wysocki 2012-11-02  734  	struct acpi_device *adev;
a6ae7594 Rafael J. Wysocki 2012-11-02 @735  	int error;
a6ae7594 Rafael J. Wysocki 2012-11-02  736  
17653a3e Rafael J. Wysocki 2014-07-23  737  	adev = ACPI_COMPANION(dev);
17653a3e Rafael J. Wysocki 2014-07-23  738  	if (!adev) {
17653a3e Rafael J. Wysocki 2014-07-23  739  		dev_dbg(dev, "ACPI companion missing in %s!\n", __func__);
a6ae7594 Rafael J. Wysocki 2012-11-02  740  		return -ENODEV;
a6ae7594 Rafael J. Wysocki 2012-11-02  741  	}
a6ae7594 Rafael J. Wysocki 2012-11-02  742  
9f7d805b Rafael J. Wysocki 2017-06-19  743  	if (!acpi_device_can_wakeup(adev))

:::::: The code at line 735 was first introduced by commit
:::::: a6ae7594b1b157e0e7976ed105a7be27d69a5361 ACPI / PM: Move device PM functions related to sleep states

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

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