linux-kernel - Re: [PATCH V2 9/9] PCI/AER: Add RCEC AER error injection support

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Date:   Wed, 5 Aug 2020 18:54:50 +0100
From:   Jonathan Cameron <Jonathan.Cameron@...wei.com>
To:     Sean V Kelley <sean.v.kelley@...el.com>
CC:     <bhelgaas@...gle.com>, <rjw@...ysocki.net>, <ashok.raj@...el.com>,
        <tony.luck@...el.com>,
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        <linux-pci@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Qiuxu Zhuo <qiuxu.zhuo@...el.com>
Subject: Re: [PATCH V2 9/9] PCI/AER: Add RCEC AER error injection support

On Tue, 4 Aug 2020 12:40:52 -0700
Sean V Kelley <sean.v.kelley@...el.com> wrote:

> From: Qiuxu Zhuo <qiuxu.zhuo@...el.com>
> 
> The Root Complex Event Collectors(RCEC) appear as peers to Root Ports
> and also have the AER capability. So add RCEC support to the current AER
> error injection driver.
> 
> Co-developed-by: Sean V Kelley <sean.v.kelley@...el.com>
> Signed-off-by: Qiuxu Zhuo <qiuxu.zhuo@...el.com>
> Signed-off-by: Sean V Kelley <sean.v.kelley@...el.com>

Silly English subtlety inline.

> ---
>  drivers/pci/pcie/aer_inject.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/pci/pcie/aer_inject.c b/drivers/pci/pcie/aer_inject.c
> index c2cbf425afc5..2077dc826fdf 100644
> --- a/drivers/pci/pcie/aer_inject.c
> +++ b/drivers/pci/pcie/aer_inject.c
> @@ -333,8 +333,11 @@ static int aer_inject(struct aer_error_inj *einj)
>  	if (!dev)
>  		return -ENODEV;
>  	rpdev = pcie_find_root_port(dev);
> +	/* If Root port not found, try to find an RCEC */
> +	if (!rpdev)
> +		rpdev = dev->rcec;
>  	if (!rpdev) {
> -		pci_err(dev, "Root port not found\n");
> +		pci_err(dev, "Root port or RCEC not found\n");

That is a bit confusing, could be

RP | !RCEC

"Neither root port nor RCEC found\n" perhaps?


>  		ret = -ENODEV;
>  		goto out_put;
>  	}