netdev - Re: [PATCH v2 12/15] ath10k: use new module_firmware

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Message-ID: <20200522052355.GZ11244@42.do-not-panic.com>
Date:   Fri, 22 May 2020 05:23:55 +0000
From:   Luis Chamberlain <mcgrof@...nel.org>
To:     Emmanuel Grumbach <egrumbach@...il.com>
Cc:     Brian Norris <briannorris@...omium.org>,
        Johannes Berg <johannes@...solutions.net>,
        linux-wireless <linux-wireless@...r.kernel.org>,
        aquini@...hat.com, peterz@...radead.org,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        mchehab+samsung@...nel.org, will@...nel.org, bhe@...hat.com,
        ath10k@...ts.infradead.org, Takashi Iwai <tiwai@...e.de>,
        mingo@...hat.com, dyoung@...hat.com, pmladek@...e.com,
        Kees Cook <keescook@...omium.org>,
        Arnd Bergmann <arnd@...db.de>, gpiccoli@...onical.com,
        Steven Rostedt <rostedt@...dmis.org>, cai@....pw,
        tglx@...utronix.de,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Kalle Valo <kvalo@...eaurora.org>,
        "<netdev@...r.kernel.org>" <netdev@...r.kernel.org>,
        schlad@...e.de, Linux Kernel <linux-kernel@...r.kernel.org>,
        jeyu@...nel.org, Andrew Morton <akpm@...ux-foundation.org>,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH v2 12/15] ath10k: use new module_firmware_crashed()

On Fri, May 22, 2020 at 08:12:59AM +0300, Emmanuel Grumbach wrote:
> >
> > On Tue, May 19, 2020 at 10:37 PM Emmanuel Grumbach <egrumbach@...il.com> wrote:
> > > So I believe we already have this uevent, it is the devcoredump. All
> > > we need is to add the unique id.
> >
> > I think there are a few reasons that devcoredump doesn't satisfy what
> > either Luis or I want.
> >
> > 1) it can be disabled entirely [1], for good reasons (e.g., think of
> > non-${CHIP_VENDOR} folks, who can't (and don't want to) do anything
> > with the opaque dumps provided by closed-source firmware)
> 
> Ok, if all you're interested into is the information that this event
> happen (as opposed to report a bug and providing the data), then I
> agree. 

I've now hit again a firmware crash with ath10k with the latest firwmare
and kernel and the *only* thing that helped recovery was a full reboot,
so that is a crystal clear case that this needs to taint the kernel, and
yes we do want to inform users too, so I've just added uevent support
for a few panic / taint events in the kernel now and rolled into my
series. I'll run some final tests and then post this as a follow up.

devlink didn't cut it, its networking specific.

  Luis