linux-kernel - Re: [PATCH V1] PCI: dwc: Use dev_info for PCIe link down event logging

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Message-ID: <YyHqxGw6ADmJUTEv@rocinante>
Date:   Wed, 14 Sep 2022 23:52:52 +0900
From:   Krzysztof Wilczyński <kw@...ux.com>
To:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Cc:     Jon Hunter <jonathanh@...dia.com>, Vidya Sagar <vidyas@...dia.com>,
        Bjorn Helgaas <helgaas@...nel.org>, jingoohan1@...il.com,
        gustavo.pimentel@...opsys.com, lpieralisi@...nel.org,
        robh@...nel.org, bhelgaas@...gle.com, treding@...dia.com,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        kthota@...dia.com, mmaddireddy@...dia.com, sagar.tv@...il.com
Subject: Re: [PATCH V1] PCI: dwc: Use dev_info for PCIe link down event
 logging

Hello,

> > Perhaps it makes sense to make this a dev_dbg() over dev_info(), especially
> > since it appears that this information is of more use to the developer (who
> > most likely has the suitable log level set anyway), and given that there is
> > no way to reliably detect a presence in a slot on some platforms, this
> > might otherwise, add to the other messages that normal users don't pay
> > attention to usually - if this is not to be treated as an error.
> > 
> 
> No, this is clearly not a debug message. As I quoted above, the link up
> can fail due to an issue with PHY also. In that case, user has to see
> the log to debug/report the issue.

Apologies!  I missed that.  Thank you!
 
> So, either dev_info() or dev_err().

So, there is nothing to do here, then.  This stays as dev_err() as per the
change from:

  14c4ad125cf9 ("PCI: dwc: Log link speed and width if it comes up")

That said, perhaps adding a comment explaining why this is an error
might help future reference, as the linked commit didn't justify the
change.  There also will be redundant messages printed, as per:

  https://elixir.bootlin.com/linux/v6.0-rc5/source/drivers/pci/controller/dwc/pcie-fu740.c#L207

Which the linked commit didn't take into account, I suppose.

	Krzysztof