linux-kernel - Re: [PATCH v4 4/8] PCI/DPC: Use pci_aer_clear_status() in dpc_process_error()

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Date:   Wed, 20 Oct 2021 20:40:29 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Naveen Naidu <naveennaidu479@...il.com>
Cc:     bhelgaas@...gle.com, ruscur@...sell.cc, oohall@...il.com,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org,
        linux-kernel-mentees@...ts.linuxfoundation.org
Subject: Re: [PATCH v4 4/8] PCI/DPC: Use pci_aer_clear_status() in
 dpc_process_error()

On Tue, Oct 05, 2021 at 10:48:11PM +0530, Naveen Naidu wrote:
> dpc_process_error() clears both AER fatal and non fatal status
> registers. Instead of clearing each status registers via a different
> function call use pci_aer_clear_status().
> 
> This helps clean up the code a bit.
> 
> Signed-off-by: Naveen Naidu <naveennaidu479@...il.com>
> ---
>  drivers/pci/pcie/dpc.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/pci/pcie/dpc.c b/drivers/pci/pcie/dpc.c
> index df3f3a10f8bc..faf4a1e77fab 100644
> --- a/drivers/pci/pcie/dpc.c
> +++ b/drivers/pci/pcie/dpc.c
> @@ -288,8 +288,7 @@ void dpc_process_error(struct pci_dev *pdev)
>  		 dpc_get_aer_uncorrect_severity(pdev, &info) &&
>  		 aer_get_device_error_info(pdev, &info)) {
>  		aer_print_error(pdev, &info);
> -		pci_aer_clear_nonfatal_status(pdev);
> -		pci_aer_clear_fatal_status(pdev);
> +		pci_aer_clear_status(pdev);

The commit log suggests that this is a simple cleanup that doesn't
change any behavior, but that's not quite true:

  - The new code would clear PCI_ERR_ROOT_STATUS, but the old code
    does not.

  - The old code masks the status bits with the severity bits before
    clearing, but the new code does not.

The commit log needs to show why these changes are what we want.

>  	}
>  }
>  
> -- 
> 2.25.1
> 
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