netdev - Re: [RFC 1/2] devlink: add simple fw crash helpers

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Message-ID: <20200522215145.GC11244@42.do-not-panic.com>
Date:   Fri, 22 May 2020 21:51:45 +0000
From:   Luis Chamberlain <mcgrof@...nel.org>
To:     Johannes Berg <johannes@...solutions.net>
Cc:     Jakub Kicinski <kuba@...nel.org>, derosier@...il.com,
        greearb@...delatech.com, jeyu@...nel.org,
        akpm@...ux-foundation.org, arnd@...db.de, rostedt@...dmis.org,
        mingo@...hat.com, aquini@...hat.com, cai@....pw, dyoung@...hat.com,
        bhe@...hat.com, peterz@...radead.org, tglx@...utronix.de,
        gpiccoli@...onical.com, pmladek@...e.com, tiwai@...e.de,
        schlad@...e.de, andriy.shevchenko@...ux.intel.com,
        keescook@...omium.org, daniel.vetter@...ll.ch, will@...nel.org,
        mchehab+samsung@...nel.org, kvalo@...eaurora.org,
        davem@...emloft.net, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-wireless@...r.kernel.org,
        ath10k@...ts.infradead.org, jiri@...nulli.us,
        briannorris@...omium.org
Subject: Re: [RFC 1/2] devlink: add simple fw crash helpers

On Fri, May 22, 2020 at 10:46:07PM +0200, Johannes Berg wrote:
> FWIW, I still completely disagree on that taint. You (Luis) obviously
> have been running into a bug in that driver, I doubt the firmware
> actually managed to wedge the hardware.

This hasn't happened just once, its happed many times sporadically now,
once a week or two weeks I'd say. And the system isn't being moved
around.

> But even if it did, that's still not really a kernel taint. The kernel
> itself isn't in any way affected by this.

Of course it is, a full reboot is required.

> Yes, the system is in a weird state now. But that's *not* equivalent to
> "kernel tainted".

Requiring a full reboot is a dire situation to be in, and loosing
connectivity to the point this is not recoverable likewise.

You guys are making out a taint to be the end of the world. We have a
taint even for a kernel warning, and as others have mentioned mac80211
already produces these.

What exactly is the opposition to a taint to clarify that a device
firmware has crashed and your system requires a full reboot?

  Luis