linux-kernel - Re: [PATCH v3 1/1] PCI/ERR: Fix reset logic in pcie_do

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Date:   Fri, 25 Sep 2020 19:50:55 -0400
From:   Sinan Kaya <okaya@...nel.org>
To:     "Kuppuswamy, Sathyanarayanan" 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        Bjorn Helgaas <helgaas@...nel.org>
Cc:     bhelgaas@...gle.com, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org, ashok.raj@...el.com,
        Jay Vosburgh <jay.vosburgh@...onical.com>
Subject: Re: [PATCH v3 1/1] PCI/ERR: Fix reset logic in pcie_do_recovery()
 call

On 9/25/2020 2:16 PM, Kuppuswamy, Sathyanarayanan wrote:
>> One approach is to share the restore code between hotplug driver and
>> DPC driver.
>>
>> If this is a too involved change, DPC driver should restore state
>> when hotplug is not supported.
> Yes. we can add a condition for hotplug capability check.

Now that I think about this more...

This won't work. Link is brought down automatically by the DPC hardware.
Therefore, all software state is lost. Restore won't help here.

The only solution I can see is to force driver disconnect and rescan.