linux-kernel - Re: [RFC PATCH 2/9] PCI/AER: Call AER CE handler before clearing AER CE status register

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Date: Mon, 24 Jun 2024 13:00:41 -0500
From: Terry Bowman <Terry.Bowman@....com>
To: Dan Williams <dan.j.williams@...el.com>, ira.weiny@...el.com,
 dave@...olabs.net, dave.jiang@...el.com, alison.schofield@...el.com,
 ming4.li@...el.com, vishal.l.verma@...el.com, jim.harris@...sung.com,
 ilpo.jarvinen@...ux.intel.com, ardb@...nel.org,
 sathyanarayanan.kuppuswamy@...ux.intel.com, linux-cxl@...r.kernel.org,
 linux-kernel@...r.kernel.org, Yazen.Ghannam@....com, Robert.Richter@....com
Cc: Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org
Subject: Re: [RFC PATCH 2/9] PCI/AER: Call AER CE handler before clearing AER
 CE status register

Hi Dan, I added a response below.

On 6/21/24 14:23, Dan Williams wrote:
> Terry Bowman wrote:
>> The AER service driver clears the AER correctable error (CE) status before
>> calling the correctable error handler. This results in the error's status
>> not correctly reflected if read from the CE handler.
>>
>> The AER CE status is needed by the portdrv's CE handler. The portdrv's
>> CE handler is intended to only call the registered notifier callbacks
>> if the CE error status has correctable internal error (CIE) set.
> 
> Is this a fix or a prep patch? It reads like a "fix", but there are no
> notifiers to worry about today.
> 

I will add mention "in preparation for future patch".

>> This is not a problem for AER uncorrrectbale errors (UCE). The UCE status
>> is still present in the AER capability and available for reading, if
>> needed, when the UCE handler is called.
>>
>> Change the order of clearing the CE status and calling the CE handler.
>> Make it to call the CE handler first and then clear the CE status
>> after returning.
> 
> With the changelog clarified to indicate whether this has any impact on
> current behavior you can add:
> 
> Acked-by: Dan Williams <dan.j.williams@...el.com>

Regards,
Terry