linux-kernel - Re: [PATCH] BUG-REPORT: snd-hda: hacked-together EPROBE

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Date:   Tue, 04 Jul 2017 17:28:13 +0200
From:   Takashi Iwai <tiwai@...e.de>
To:     Daniel Vetter <daniel@...ll.ch>
Cc:     Chris Wilson <chris@...is-wilson.co.uk>,
        Intel Graphics Development <intel-gfx@...ts.freedesktop.org>,
        Guneshwor Singh <guneshwor.o.singh@...el.com>,
        Hardik T Shah <hardik.t.shah@...el.com>,
        Libin Yang <libin.yang@...el.com>,
        "Subhransu S. Prusty" <subhransu.s.prusty@...el.com>,
        Vinod Koul <vinod.koul@...el.com>,
        Julia Lawall <Julia.Lawall@...6.fr>,
        Jaroslav Kysela <perex@...ex.cz>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] BUG-REPORT: snd-hda: hacked-together EPROBE_DEFER support

On Tue, 04 Jul 2017 17:14:39 +0200,
Daniel Vetter wrote:
> 
> On Thu, Jun 29, 2017 at 12:25 PM, Daniel Vetter <daniel@...ll.ch> wrote:
> >> Now I took a closer look, and this appears rather like a brown paper
> >> bag bug, not about the deferred probe or module dependency.
> >> The fix patch is below.  Could you check whether it works?
> >
> > Yay, this works!
> >
> > Tested-by: Daniel Vetter <daniel.vetter@...ll.ch>
> 
> Next one: i915 module reloading is broken because something is holding
> onto a module reference and doesn't drop it. Didn't check which sets
> of patches introduced this, but iirc this worked last week. Disabling
> hda-intel gets in Kconfig gets rid of the problem, so I assume
> something in the sound driver is leaking that reference ...
> 
> It's also causing lots and lots of red in our CI :( If we can't fix
> this we need to disable snd-hda-intel there too.

I spotted out a typo in my previous patch that leads to the module
reference unbalance.  The fix is  already in sound.git tree today:
  https://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound.git/commit/?h=for-linus&id=fc18282cdcba984ab89c74d7e844c10114ae0795

The bug was introduced after 4.12.


thanks,

--
Takashi Iwai <tiwai@...e.de>