linux-kernel - Re: btusb "firmware request while host is not available" at resume

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Message-ID: <CA+55aFzWABZ+KCKT+r+TgyrWfnc+6YE7ZuHhZmgw-cRQXWTQ2w@mail.gmail.com>
Date:   Sun, 10 Sep 2017 21:25:08 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Gabriel C <nix.or.die@...il.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Luis R. Rodriguez" <mcgrof@...nel.org>, Tejun Heo <tj@...nel.org>,
        Marcel Holtmann <marcel@...tmann.org>,
        Gustavo Padovan <gustavo@...ovan.org>,
        Sukumar Ghorai <sukumar.ghorai@...el.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "bluez mailin list (linux-bluetooth@...r.kernel.org)" 
        <linux-bluetooth@...r.kernel.org>
Subject: Re: btusb "firmware request while host is not available" at resume

On Sun, Sep 10, 2017 at 8:49 PM, Gabriel C <nix.or.die@...il.com> wrote:
>
> Yes 81f95076281f is to blame.. After reverting it all is fine again.
>
> 15 resume cycles on the one laptop , 10 on the other without to hit the
> trace.

Yeah, I think that disable/enable_firmware in the suspend/resume path
is basically just completely random code. There  is nothing that
serializes with anything else, and it has no actual basis for saying
"I am now disabled/enabled" except for some entirely random time of
whenever the suspend/resume callbacks happen.

I'm going to revert it.

I wonder why 4.13 seemed to work for me. Or maybe it didn't, and I
just didn't notice, because I didn't use bluetooth and I wasn't
traveling. I test my laptop every release, but I don't necessarily
always _use_ it.

               Linus