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

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Date: Fri, 21 Jun 2024 12:23:52 -0700
From: Dan Williams <dan.j.williams@...el.com>
To: Terry Bowman <terry.bowman@....com>, <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

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.

> 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>