linux-kernel - Re: [PATCH v3 3/3] PCI: Avoid slot reset for Cavium cn8xxx root ports

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Message-ID: <20170907074904.GB13490@hc>
Date:   Thu, 7 Sep 2017 09:49:04 +0200
From:   Jan Glauber <jan.glauber@...iumnetworks.com>
To:     Alex Williamson <alex.williamson@...hat.com>
Cc:     Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org, david.daney@...ium.com,
        Jon Masters <jcm@...hat.com>,
        Robert Richter <robert.richter@...ium.com>,
        linux-arm-kernel@...ts.infradead.org, kvm@...r.kernel.org
Subject: Re: [PATCH v3 3/3] PCI: Avoid slot reset for Cavium cn8xxx root ports

On Thu, Sep 07, 2017 at 09:40:11AM +0200, Jan Glauber wrote:
> So what if we add an additional check like:
> 
> diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
> index fdf65a6..389db4b 100644
> --- a/drivers/pci/pci.c
> +++ b/drivers/pci/pci.c
> @@ -4389,6 +4389,9 @@ static bool pci_slot_resetable(struct pci_slot *slot)
>  {
>         struct pci_dev *dev;
>  
> +       if (slot->bus->self & PCI_DEV_FLAGS_NO_BUS_RESET)
> +               return false;
> +
>         list_for_each_entry(dev, &slot->bus->devices, bus_list) {
>                 if (!dev->slot || dev->slot != slot)
>                         continue;

Obviously I meant:
if (slot->bus->self->dev_flags & PCI_DEV_FLAGS_NO_BUS_RESET)

--Jan