linux-kernel - Re: [PATCHv2 0/6] Motorola Droid 4 Audio Support

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Date:   Thu, 27 Jul 2017 11:23:21 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Tony Lindgren <tony@...mide.com>
Cc:     Takashi Iwai <tiwai@...e.de>,
        Sebastian Reichel <sebastian.reichel@...labora.co.uk>,
        alsa-devel@...a-project.org, Liam Girdwood <lgirdwood@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org
Subject: Re: [PATCHv2 0/6] Motorola Droid 4 Audio Support

On Thu, Jul 27, 2017 at 02:39:43AM -0700, Tony Lindgren wrote:
> * Takashi Iwai <tiwai@...e.de> [170718 02:38]:

> > The problem manifests itself as an unblanaced of node reference.
> > The node is released mistakenly at of_node_put() and this is caught as
> > sleep-in-atomic, fortunately.

> > So likely either something forgot to take the node ref or it hits the
> > unreference due to the missing object by the implicit probe disorder,
> > etc, I suppose.

> Yup you're right. This is what happens, will send a fix for it shortly.

There was also a separate thread where people were trying to fix this
having run into it elsewhere.  The of_graph APIs look pretty confusing
from a user point of view sadly :(

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