linux-kernel - Re: [PATCH AUTOSEL 4.14 52/87] nfp: fail probe if serial or interface id is missing

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Date:   Thu, 27 Sep 2018 19:50:30 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     Jakub Kicinski <jakub.kicinski@...ronome.com>
CC:     "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "David S . Miller" <davem@...emloft.net>
Subject: Re: [PATCH AUTOSEL 4.14 52/87] nfp: fail probe if serial or interface
 id is missing

On Mon, Sep 17, 2018 at 07:03:17AM -0700, Jakub Kicinski wrote:
>On Mon, 17 Sep 2018 03:02:55 +0000, Sasha Levin wrote:
>> From: Jakub Kicinski <jakub.kicinski@...ronome.com>
>>
>> [ Upstream commit 18aa5b180f00a10c2f63944b4f0ab116bf8ea19b ]
>>
>> On some platforms with broken ACPI tables we may not have access
>> to the Serial Number PCIe capability.  This capability is crucial
>> for us for switchdev operation as we use serial number as switch ID,
>> and for communication with management FW where interface ID is used.
>>
>> If we can't determine the Serial Number we have to fail device probe.
>>
>> Signed-off-by: Jakub Kicinski <jakub.kicinski@...ronome.com>
>> Signed-off-by: David S. Miller <davem@...emloft.net>
>> Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
>
>If the problem occurs the driver would usually fail to probe anyway
>(e.g. due to missing SR-IOV capability), just without providing any
>clear message why.  So the patch is not of huge importance, but I'm
>not opposed to back porting it.
>
>I should've put this info in the commit message, my bad.

Now removed, thanks!