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Date:   Mon, 18 May 2020 13:35:21 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Johannes Berg <johannes@...solutions.net>
Cc:     Luis Chamberlain <mcgrof@...nel.org>,
        Steve deRosier <derosier@...il.com>,
        Ben Greear <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,
        Takashi Iwai <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, Kalle Valo <kvalo@...eaurora.org>,
        "David S. Miller" <davem@...emloft.net>,
        Network Development <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-wireless <linux-wireless@...r.kernel.org>,
        ath10k@...ts.infradead.org
Subject: Re: [PATCH v2 12/15] ath10k: use new module_firmware_crashed()

On Mon, 18 May 2020 22:29:53 +0200 Johannes Berg wrote:
> On Mon, 2020-05-18 at 13:28 -0700, Jakub Kicinski wrote:
> > On Mon, 18 May 2020 21:25:09 +0200 Johannes Berg wrote:  
> > > It's pretty clear, but even then, first of all I doubt this is the case
> > > for many of the places that you've sprinkled the annotation on, and
> > > secondly it actually hides useful information.
> > > 
> > > Regardless of the support issue, I think this hiding of information is
> > > also problematic.
> > > 
> > > I really think we'd all be better off if you just made a sysfs file (I
> > > mistyped debugfs in some other email, sorry, apparently you didn't see
> > > the correction in time) that listed which device(s) crashed and how many
> > > times. That would actually be useful. Because honestly, if a random
> > > device crashed for some random reason, that's pretty much a non-event.
> > > If it keeps happening, then we might even want to know about it.  
> > 
> > Johannes - have you seen devlink health? I think we should just use
> > that interface, since it supports all the things you're requesting,
> > rather than duplicate it in sysfs.  
> 
> I haven't, and I'm glad to hear that's there, sounds good!
> 
> I suspect that Luis wants something more generic though, that isn't just
> applicable to netdevices, unless devlink grew some kind of non-netdev
> stuff while I wasn't looking? :)

It's intended to be a generic netlink channel for configuring devices.

All the firmware-related interfaces have no dependencies on netdevs,
in fact that's one of the reasons we moved to devlink - we don't want
to hold rtnl lock just for talking to device firmware.

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