linux-kernel - Re: [PATCH v2] PCI: disable SERR for kdump kernel

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Message-ID: <CAE9FiQVQ4Mvc_SufENJcuO1309h+jqDdme9XNB3R9OvZJKzHvQ@mail.gmail.com>
Date:   Thu, 20 Apr 2017 16:37:16 -0700
From:   Yinghai Lu <yinghai@...nel.org>
To:     Sinan Kaya <okaya@...eaurora.org>
Cc:     Bjorn Helgaas <bhelgaas@...gle.com>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] PCI: disable SERR for kdump kernel

On Thu, Apr 20, 2017 at 10:14 AM, Sinan Kaya <okaya@...eaurora.org> wrote:
> On 4/18/2017 8:31 PM, Yinghai Lu wrote:
>> * pci_setup_device - fill in class and map information of a device
>>   * @dev: the device structure to fill
>> @@ -1572,6 +1592,9 @@ int pci_setup_device(struct pci_dev *dev
>>       /* device class may be changed after fixup */
>>       class = dev->class >> 8;
>>
>> +     if (is_kdump_kernel())
>> +             pci_disable_serr(dev);
>> +
>
> This sounds like something that needs to be done while shutting down
> the first kernel as part of the kdump procedure rather than boot of
> the kdump kernel in pci setup.

For kdump path, first kernel shutdown path is not called.

We have to do sth in second kernel instead.

Thanks

Yinghai