linux-kernel - Re: [PATCH] PCI/AER: Do not clear AER bits if we don't own AER

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Date:   Thu, 19 Jul 2018 14:56:06 -0500
From:   "Alex G." <mr.nuke.me@...il.com>
To:     Sinan Kaya <okaya@...nel.org>, bhelgaas@...gle.com,
        keith.busch@...el.com
Cc:     alex_gagniuc@...lteam.com, austin_bolen@...l.com,
        shyam_iyer@...l.com, Frederick Lawler <fred@...dlawl.com>,
        Oza Pawandeep <poza@...eaurora.org>, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] PCI/AER: Do not clear AER bits if we don't own AER



On 07/19/2018 11:58 AM, Sinan Kaya wrote:
> 
> On 7/19/2018 8:55 AM, Alex G. wrote:
>> I find the intent clearer if we check it here rather than having to do 
>> the mental parsing of the state of aer_cap.
> 
> I don't feel too strong about my comment to be honest. This was a
> style/maintenance comment.
> 
> It feels like we are putting pcie_aer_get_firmware_first() into core
> functions unnecessarily after your change. I understand the need for
> your change. I'm asking if it is the right place or not.
> 
> pcie_aer_get_firmware_first() should be called from either the init or
> probe function so that the rest of the AER functions do not get called
> from any other context.
> 
> If someone adds another AER function, we might need to add another
> pcie_aer_get_firmware_first() check there. So, we have unnecessary code
> duplication.

We could move the aer_cap and get_ffs() check into one function that we 
end up calling all over the place. I understand your concern about code 
duplication, and I agree with it. I don't think that at this point it's 
that big of a deal, although we might need to guard every aer_() call.

So moving all the checks in a pcie_aer_is_kernel_first() makes sense.

Alex