linux-kernel - Re: [PATCH v15 5/9] PCI/AER: Factor out error reporting from AER

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Date:   Fri, 4 May 2018 05:52:44 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Oza Pawandeep <poza@...eaurora.org>
Cc:     kbuild-all@...org, Bjorn Helgaas <bhelgaas@...gle.com>,
        Philippe Ombredanne <pombredanne@...b.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        Dongdong Liu <liudongdong3@...wei.com>,
        Keith Busch <keith.busch@...el.com>, Wei Zhang <wzhang@...com>,
        Sinan Kaya <okaya@...eaurora.org>,
        Timur Tabi <timur@...eaurora.org>,
        Oza Pawandeep <poza@...eaurora.org>
Subject: Re: [PATCH v15 5/9] PCI/AER: Factor out error reporting from AER

Hi Oza,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on pci/next]
[also build test ERROR on v4.17-rc3 next-20180503]
[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/Oza-Pawandeep/Address-error-and-recovery-for-AER-and-DPC/20180504-050017
base:   https://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci.git next
config: x86_64-randconfig-x015-201817 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-16) 7.3.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   drivers/pci/pcie/err.c: In function 'report_error_detected':
>> drivers/pci/pcie/err.c:98:3: error: implicit declaration of function 'pci_uevent_ers'; did you mean 'pci_select_bars'? [-Werror=implicit-function-declaration]
      pci_uevent_ers(dev, PCI_ERS_RESULT_NONE);
      ^~~~~~~~~~~~~~
      pci_select_bars
   drivers/pci/pcie/err.c: In function 'reset_link':
   drivers/pci/pcie/err.c:203:5: warning: 'driver' is used uninitialized in this function [-Wuninitialized]
     if (driver && driver->reset_link) {
        ^
   cc1: some warnings being treated as errors

vim +98 drivers/pci/pcie/err.c

    52	
    53	static int report_error_detected(struct pci_dev *dev, void *data)
    54	{
    55		pci_ers_result_t vote;
    56		const struct pci_error_handlers *err_handler;
    57		struct aer_broadcast_data *result_data;
    58	
    59		result_data = (struct aer_broadcast_data *) data;
    60	
    61		device_lock(&dev->dev);
    62		dev->error_state = result_data->state;
    63	
    64		if (!dev->driver ||
    65			!dev->driver->err_handler ||
    66			!dev->driver->err_handler->error_detected) {
    67			if (result_data->state == pci_channel_io_frozen &&
    68				dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) {
    69				/*
    70				 * In case of fatal recovery, if one of down-
    71				 * stream device has no driver. We might be
    72				 * unable to recover because a later insmod
    73				 * of a driver for this device is unaware of
    74				 * its hw state.
    75				 */
    76				pci_printk(KERN_DEBUG, dev, "device has %s\n",
    77					   dev->driver ?
    78					   "no AER-aware driver" : "no driver");
    79			}
    80	
    81			/*
    82			 * If there's any device in the subtree that does not
    83			 * have an error_detected callback, returning
    84			 * PCI_ERS_RESULT_NO_AER_DRIVER prevents calling of
    85			 * the subsequent mmio_enabled/slot_reset/resume
    86			 * callbacks of "any" device in the subtree. All the
    87			 * devices in the subtree are left in the error state
    88			 * without recovery.
    89			 */
    90	
    91			if (dev->hdr_type != PCI_HEADER_TYPE_BRIDGE)
    92				vote = PCI_ERS_RESULT_NO_AER_DRIVER;
    93			else
    94				vote = PCI_ERS_RESULT_NONE;
    95		} else {
    96			err_handler = dev->driver->err_handler;
    97			vote = err_handler->error_detected(dev, result_data->state);
  > 98			pci_uevent_ers(dev, PCI_ERS_RESULT_NONE);
    99		}
   100	
   101		result_data->result = merge_result(result_data->result, vote);
   102		device_unlock(&dev->dev);
   103		return 0;
   104	}
   105	

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