netdev - Re: [net-next] i40iw/i40e: Remove link dependency on i40e

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Date:   Wed, 23 May 2018 15:00:10 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     jeffrey.t.kirsher@...el.com
Cc:     dledford@...hat.com, jgg@...lanox.com, sindhu.devale@...el.com,
        netdev@...r.kernel.org, linux-rdma@...r.kernel.org,
        nhorman@...hat.com, sassmann@...hat.com, jogreene@...hat.com,
        shiraz.saleem@...el.com
Subject: Re: [net-next] i40iw/i40e: Remove link dependency on i40e

From: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Date: Tue, 22 May 2018 13:38:31 -0700

> From: Sindhu Devale <sindhu.devale@...el.com>
> 
> Currently i40iw is dependent on i40e symbols
> i40e_register_client and i40e_unregister_client due to
> which i40iw cannot be loaded without i40e being loaded.
> 
> This patch allows RDMA driver to build and load without
> linking to LAN driver and without LAN driver being loaded
> first. Once the LAN driver is loaded, the RDMA driver
> is notified through the netdevice notifiers to register
> as client to the LAN driver. Add function pointers to IDC
> register/unregister in the private VSI structure. This
> allows a RDMA driver to build without linking to i40e.
> 
> Signed-off-by: Sindhu Devale <sindhu.devale@...el.com>
> Signed-off-by: Shiraz Saleem <shiraz.saleem@...el.com>
> Tested-by: Andrew Bowers <andrewx.bowers@...el.com>
> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>

If two drivers depend upon eachother, and a change to one can create
an incompatibility with the other, by definition they must be upgraded
together.

This doesn't even get into recompiling or anything like that, it's a
simple fact of life.

I'm not applying this sorry.