netdev - Re: [PATCH 07/10] net: ehernet: ixp4xx: Use devm_alloc

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Message-ID: <CACRpkdbp_dSLTs-ZcRqckbez_3G7a1CtZSu+dJrTSdtVz=JXJg@mail.gmail.com>
Date:   Fri, 1 Nov 2019 00:13:08 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Joe Perches <joe@...ches.com>
Cc:     netdev <netdev@...r.kernel.org>,
        "David S . Miller" <davem@...emloft.net>,
        Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH 07/10] net: ehernet: ixp4xx: Use devm_alloc_etherdev()

On Sun, Oct 27, 2019 at 12:24 AM Joe Perches <joe@...ches.com> wrote:
> On Mon, 2019-10-21 at 02:08 +0200, Linus Walleij wrote:

> > diff --git a/drivers/net/ethernet/xscale/ixp4xx_eth.c b/drivers/net/ethernet/xscale/ixp4xx_eth.c
>
> Maybe it's better to avoid changing this driver.
> Is this device still sold?  It's 15+ years old.

I am converting the whole platform to device tree so I need to
change this and many other drivers.

The rationale has been explained elsewhere but here it is for your
convenience:

A major reason why IXP4xx silicon is still produced and deployed is
the operating conditions. If you look at for example the Gateworks
Cambria GW2358-4 network processor you notice the strictly
military operating conditions:

Temperature: -40°C to +85°C
Humidity (non-condensing): 20% to 90%
MTBF (mean time before failure): 60 Years at 55°C

We have good reasons to believe that these are used in critical
systems that are not consumer products and do not adhere to
consumer product life cycle expectations. Think more like this:
https://www.c4isrnet.com/air/2019/10/17/the-us-nuclear-forces-dr-strangelove-era-messaging-system-finally-got-rid-of-its-floppy-disks/

Yours,
Linus Walleij