linux-kernel - Re: [PATCH for-next] Revert "IB/mlx5: Don't return errors from poll

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Date:   Thu, 3 Mar 2022 21:09:04 +0200
From:   Leon Romanovsky <leon@...nel.org>
To:     Håkon Bugge <haakon.bugge@...cle.com>
Cc:     Jason Gunthorpe <jgg@...pe.ca>, linux-rdma@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH for-next] Revert "IB/mlx5: Don't return errors from
 poll_cq"

On Thu, Mar 03, 2022 at 02:50:17PM +0100, Håkon Bugge wrote:
> This reverts commit dbdf7d4e7f911f79ceb08365a756bbf6eecac81c.
> 
> Commit dbdf7d4e7f91 ("IB/mlx5: Don't return errors from poll_cq") is
> needed, when driver/fw communication gets wedged.
> 
> With a large fleet of systems equipped with CX-5, we have observed the
> following mlx5 error message:
> 
> wait_func:945:(pid xxx): ACCESS_REG(0x805) timeout. Will cause a
> leak of a command resource

It is arguably FW issue. Please contact your Nvidia support representative.

Thanks