linux-kernel - Re: [PATCH] PCI/ASPM: Reduce severity of log message

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Date:   Sat, 28 Mar 2020 15:10:49 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Chris Packham <chris.packham@...iedtelesis.co.nz>
Cc:     Heiner Kallweit <hkallweit1@...il.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] PCI/ASPM: Reduce severity of log message

On Mon, Mar 23, 2020 at 04:55:30PM +1300, Chris Packham wrote:
> When the UEFI/BIOS or bootloader has not initialised a PCIe device we
> would get the following message.
> 
>   kern.warning: pci 0000:00:01.0: ASPM: current common clock configuration is broken, reconfiguring
> 
> "warning" and "broken" are slightly misleading. On an embedded system it
> is quite possible for the bootloader to avoid configuring PCIe devices
> if they are not needed.
> 
> Downgrade the message to pci_info() and change "broken" to
> "inconsistent" since we fix up the inconsistency in the code immediately
> following the message (and emit an error if that fails).
> 
> Signed-off-by: Chris Packham <chris.packham@...iedtelesis.co.nz>

Applied to pci/aspm for v5.7, thanks!

> ---
> I'm updating a system from an older kernel to the latest and our tests flagged
> this error message. I don't believe it's actually an error since our bootloader
> doesn't touch the PCI bus (infact the kernel releases the reset to that
> particular device before the PCI bus scan).
> 
>  drivers/pci/pcie/aspm.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c
> index 0dcd44308228..3a165ab3413b 100644
> --- a/drivers/pci/pcie/aspm.c
> +++ b/drivers/pci/pcie/aspm.c
> @@ -273,7 +273,7 @@ static void pcie_aspm_configure_common_clock(struct pcie_link_state *link)
>  		}
>  		if (consistent)
>  			return;
> -		pci_warn(parent, "ASPM: current common clock configuration is broken, reconfiguring\n");
> +		pci_info(parent, "ASPM: current common clock configuration is inconsistent, reconfiguring\n");
>  	}
>  
>  	/* Configure downstream component, all functions */
> -- 
> 2.25.1
>