linux-kernel - Re: [PATCH] pciehp: Fix race condition handling surprise link-down

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Date:   Wed, 8 Mar 2017 04:27:26 -0800
From:   "Raj, Ashok" <ashok.raj@...el.com>
To:     Bjorn Helgaas <helgaas@...nel.org>
Cc:     linux-pci@...r.kernel.org, Bjorn Helgaas <bhelgaas@...gle.com>,
        linux-kernel@...r.kernel.org, Keith Busch <keith.busch@...el.com>,
        ashok.raj@...el.com
Subject: Re: [PATCH] pciehp: Fix race condition handling surprise link-down

On Mon, Mar 06, 2017 at 06:24:17PM -0600, Bjorn Helgaas wrote:
> On Fri, Feb 03, 2017 at 10:51:04AM -0600, Bjorn Helgaas wrote:
> 
> Hi Ashok,
> 
> Just a ping to make sure we're not deadlocked.  I'm waiting for you,
> so I hope you're not also waiting for me :)  I'm not trying to rush you;
> I just don't want to drop this by mistake.
> 
Hi Bjorn

no we aren't deadlocked :-). I didn't get around changing it to ordered
queue yet, mostly worried about having to retest all the different 
combinations with ATTN, POWER_CTL, SLD.

I'm depending on other folks to test SLD. They are tied up with other
issues ATM.

I have had another OEM test with several disks and multiple ATTN's 
pressed/cancel and current code seems to be working well so far, except the 
SLD case.

The change in the patch was only ensuring that we don't start another 
POWER_ON or POWER_OFF before the earlier operation was complete.

Would it be alright to fix SLD with this version while we can probe a clean
approach that can give us sufficient time to test a clean approach that works
with all the different combinations and OEM systems?

Cheers
Ashok