linux-kernel - Re: [PATCH] PCI: rework error checking in the reset path

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Message-ID: <47146df8-b4e1-595d-9664-3830d770eecf@codeaurora.org>
Date:   Wed, 25 Oct 2017 17:42:24 -0400
From:   Sinan Kaya <okaya@...eaurora.org>
To:     Alex Williamson <alex.williamson@...hat.com>,
        Bjorn Helgaas <helgaas@...nel.org>
Cc:     linux-pci@...r.kernel.org, timur@...eaurora.org,
        linux-arm-msm@...r.kernel.org, Bjorn Helgaas <bhelgaas@...gle.com>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] PCI: rework error checking in the reset path

On 10/25/2017 5:28 PM, Alex Williamson wrote:
>> Previously, we only tried the next reset method if one method failed
>> with -ENOTTY.  With this patch, we'll try the next reset method if one
>> method fails for any reason, not just -ENOTTY.
> Hmm, I thought the return codes were pretty consistent.  -ENOTTY means
> that the reset callback doesn't handle the device, move on.  Many
> ioctls use the same return code to indicate an unknown ioctl.  This
> allows us to differentiate success vs error vs unhandled.  In the code
> below we lose the ability to, for instance, have a device specific
> reset that returns -EINVAL to prevent the PCI core for triggering
> further reset mechanisms which might be broken on the device.  So, I
> don't see that this patch specifically fixes anything, but it does
> remove what seems like useful functionality...  I'd veto it.  Thanks,
> 

OK, It was not obvious how the EINVAL and ENOTTY used by code inspection.

Thank your very much for the clarification. I'm dropping the patch unless
Bjorn has another idea.

> Alex
>  


-- 
Sinan Kaya
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project.