netdev - Re: [PATCH] Re: e1000e: why does pci_enable_pcie_error

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Message-ID: <4A8E3FC1.50201@redhat.com>
Date:	Fri, 21 Aug 2009 14:33:37 +0800
From:	Danny Feng <dfeng@...hat.com>
To:	Frans Pop <elendil@...net.nl>
CC:	Netdev <netdev@...r.kernel.org>, linux-kernel@...r.kernel.org,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
	David Miller <davem@...emloft.net>
Subject: Re: [PATCH] Re: e1000e: why does pci_enable_pcie_error_reporting()
 fail on my hp2510p?

On 08/21/2009 02:29 PM, Frans Pop wrote:
> On Friday 21 August 2009, Danny Feng wrote:
>> On 08/20/2009 11:14 PM, Frans Pop wrote:
>>> e1000e 0000:00:19.0: pci_enable_pcie_error_reporting failed
>>
>> I think this messages comes from hardware does not support pcie aer.
>> In fact the messages is not fatal and can be ignored. Some drivers
>> is silence with pci_enable_pcie_error_reporting ....
>
> Right. The only error returned by the function is -EIO, which looks to be
> "not supported". That's really not an issue to shout about in dmesg...
>
>> My patch is just to fix the logic of pcie aer usage ...
>>
>>> - as the error is non-fatal, should it maybe be changed from dev_err
>>>     to dev_info, so that at least it does not show up during a boot
>>>     with 'quiet'?
>>
>> I agree with this.... Maybe some of other drivers needs this too
>> (igb,ixgbe)...
>
> Here's a patch that simply drops the message.
> Note: the two scsi drivers that call the function (arcmsr and qla2xxx)
> also don't check the return code.
>
> Alternatives would be:
> - change the message to something like "device does not support advanced
>    error reporting (AER)" and make it dev_debug
> - suppress the error in case of -EIO, but I'm not sure that makes sense
>    as -EIO is the only error returned and you might not want to ignore other
>    errors
>
> If you'd prefer the alternatives, let me know and I'll modify the patch.
You may also need to silence pci_disable_pcie_error_reporting, otherwise 
rmmod/shutdown, you will get

e1000e 0000:00:19.0: pci_disable_pcie_error_reporting failed

>
> Cheers,
> FJP
>
>
> From: Frans Pop<elendil@...net.nl>
> Subject: net: Don't report an error if devices don't support AER
>
> The only error returned by pci_enable_pcie_error_reporting() is -EIO
> which simply means that Advanced Error Reporting is not supported.
> There is no need to report that, so remove the error check from e1001e,
> igb and ixgbe.
>
> Signed-off-by: Frans Pop<elendil@...net.nl>
>      ---
>
> diff --git a/drivers/net/e1000e/netdev.c b/drivers/net/e1000e/netdev.c
> index fa92a68..42ac8f1 100644
> --- a/drivers/net/e1000e/netdev.c
> +++ b/drivers/net/e1000e/netdev.c
> @@ -4983,12 +4983,7 @@ static int __devinit e1000_probe(struct pci_dev *pdev,
>   		goto err_pci_reg;
>
>   	/* AER (Advanced Error Reporting) hooks */
> -	err = pci_enable_pcie_error_reporting(pdev);
> -	if (err) {
> -		dev_err(&pdev->dev, "pci_enable_pcie_error_reporting failed "
> -		        "0x%x\n", err);
> -		/* non-fatal, continue */
> -	}
> +	pci_enable_pcie_error_reporting(pdev);
>
>   	pci_set_master(pdev);
>   	/* PCI config space info */
> diff --git a/drivers/net/igb/igb_main.c b/drivers/net/igb/igb_main.c
> index adb09d3..8e80859 100644
> --- a/drivers/net/igb/igb_main.c
> +++ b/drivers/net/igb/igb_main.c
> @@ -1232,12 +1232,7 @@ static int __devinit igb_probe(struct pci_dev *pdev,
>   	if (err)
>   		goto err_pci_reg;
>
> -	err = pci_enable_pcie_error_reporting(pdev);
> -	if (err) {
> -		dev_err(&pdev->dev, "pci_enable_pcie_error_reporting failed "
> -		        "0x%x\n", err);
> -		/* non-fatal, continue */
> -	}
> +	pci_enable_pcie_error_reporting(pdev);
>
>   	pci_set_master(pdev);
>   	pci_save_state(pdev);
> diff --git a/drivers/net/ixgbe/ixgbe_main.c b/drivers/net/ixgbe/ixgbe_main.c
> index 77b0381..4e0b523 100644
> --- a/drivers/net/ixgbe/ixgbe_main.c
> +++ b/drivers/net/ixgbe/ixgbe_main.c
> @@ -5430,12 +5430,7 @@ static int __devinit ixgbe_probe(struct pci_dev *pdev,
>   		goto err_pci_reg;
>   	}
>
> -	err = pci_enable_pcie_error_reporting(pdev);
> -	if (err) {
> -		dev_err(&pdev->dev, "pci_enable_pcie_error_reporting failed "
> -		                    "0x%x\n", err);
> -		/* non-fatal, continue */
> -	}
> +	pci_enable_pcie_error_reporting(pdev);
>
>   	pci_set_master(pdev);
>   	pci_save_state(pdev);
>

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