linux-kernel - Re: hid-related 5.2-rc1 boot hang

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Message-ID: <CAO-hwJKRRpsShw6B-YLmsEnjQ+iYtz+VmZK+VSRcDmiBwnS+oA@mail.gmail.com>
Date:   Mon, 3 Jun 2019 15:55:53 +0200
From:   Benjamin Tissoires <benjamin.tissoires@...hat.com>
To:     Hans de Goede <hdegoede@...hat.com>
Cc:     Jiri Kosina <jikos@...nel.org>,
        Dave Hansen <dave.hansen@...el.com>,
        "open list:HID CORE LAYER" <linux-input@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: hid-related 5.2-rc1 boot hang

On Mon, Jun 3, 2019 at 11:51 AM Hans de Goede <hdegoede@...hat.com> wrote:
>
> Hi Again,
>
> On 03-06-19 11:11, Hans de Goede wrote:
> <snip>
>
> >> not sure about the rest of logitech issues yet) next week.
> >
> > The main problem seems to be the request_module patches. Although I also

Can't we use request_module_nowait() instead, and set a reasonable
timeout that we detect only once to check if userspace is compatible:

In pseudo-code:
if (!request_module_checked) {
  request_module_nowait(name);
  use_request_module = wait_event_timeout(wq,
        first_module_loaded, 10 seconds in jiffies);
  request_module_checked = true;
} else if (use_request_module) {
  request_module(name);
}


> > have 2 reports of problems with hid-logitech-dj driving the 0xc52f product-id,
> > so we may need to drop that product-id from hid-logitech-dj, I'm working on
> > that one...
>
> Besides the modprobe hanging issue, the only other issues all
> (2 reporters) seem to be with 0xc52f receivers. We have a bug
> open for this:
>
> https://bugzilla.kernel.org/show_bug.cgi?id=203619
>
> And I've asked the reporter of the second bug to add his logs
> to that bug.

We should likely just remove c52f from the list of supported devices.
C52f receivers seem to have a different firmware as they are meant to
work with different devices than C534. So I guess it is safer to not
handle those right now and get the code in when it is ready.

Cheers,
Benjamin