linux-kernel - Re: [PATCH 2/2] nvme-pci: handle persistent internal error AER from NVMe controller

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Date:   Wed, 1 Jun 2022 19:08:47 +0200
From:   Christoph Hellwig <hch@....de>
To:     "Michael Kelley (LINUX)" <mikelley@...rosoft.com>
Cc:     Christoph Hellwig <hch@....de>,
        "kbusch@...nel.org" <kbusch@...nel.org>,
        "axboe@...com" <axboe@...com>,
        "sagi@...mberg.me" <sagi@...mberg.me>,
        "linux-nvme@...ts.infradead.org" <linux-nvme@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Caroline Subramoney <Caroline.Subramoney@...rosoft.com>,
        Richard Wurdack <riwurd@...rosoft.com>,
        Nathan Obr <Nathan.Obr@...rosoft.com>
Subject: Re: [PATCH 2/2] nvme-pci: handle persistent internal error AER
 from NVMe controller

On Wed, Jun 01, 2022 at 03:56:59PM +0000, Michael Kelley (LINUX) wrote:
> If there is a persistent error that does a controller reset, it looks
> like we should *not* queue async_event_work at the end of
> nvme_complete_async_event().  The controller reset will
> submit an AER on the admin queue, and so presumably
> we don't want nvme_async_event_work() to also try to submit
> another AER, which may or may not succeed depending on the
> timing of when the controller state shows LIVE again.
> Agreed?

Yes, that makes sense.  I guess we can just check the return value
from nvme_reset_ctrl and propagate this to nvme_async_event_work
and skip the rearming for that case.