linux-kernel - Re: [PATCH net-next 00/10] Convert mlx4 to use auxiliary bus

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Date:   Fri, 4 Aug 2023 13:49:50 -0300
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     Petr Pavlu <petr.pavlu@...e.com>
Cc:     tariqt@...dia.com, yishaih@...dia.com, leon@...nel.org,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, netdev@...r.kernel.org,
        linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 00/10] Convert mlx4 to use auxiliary bus

On Fri, Aug 04, 2023 at 05:05:17PM +0200, Petr Pavlu wrote:
> This series converts the mlx4 drivers to use auxiliary bus, similarly to
> how mlx5 was converted [1]. The first 6 patches are preparatory changes,
> the remaining 4 are the final conversion.
> 
> Initial motivation for this change was to address a problem related to
> loading mlx4_en/mlx4_ib by mlx4_core using request_module_nowait(). When
> doing such a load in initrd, the operation is asynchronous to any init
> control and can get unexpectedly affected/interrupted by an eventual
> root switch. Using an auxiliary bus leaves these module loads to udevd
> which better integrates with systemd processing. [2]

Neat, I didn't realize that was a pain point for distros.

Jason