linux-kernel - Re: [PATCH] ASoC: simple-card: Fix refcount underflow

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Message-ID: <87lg2d51lv.wl-kuninori.morimoto.gx@renesas.com>
Date:   18 Feb 2019 10:37:36 +0900
From:   Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
To:     Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
Cc:     Daniel Baluta <daniel.baluta@....com>,
        "broonie@...nel.org" <broonie@...nel.org>,
        "vicencb@...il.com" <vicencb@...il.com>,
        "alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
        "tiwai@...e.com" <tiwai@...e.com>,
        "lgirdwood@...il.com" <lgirdwood@...il.com>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        dl-linux-imx <linux-imx@....com>,
        "S.j. Wang" <shengjiu.wang@....com>
Subject: Re: [PATCH] ASoC: simple-card: Fix refcount underflow


Hi Daniel, Mark, again

> > of_get_child_by_name() takes a reference we'll need to drop
> > later so when we substitute in top we need to take a reference
> > as well as just assigning.
> > 
> > Without this patch we hit the following error:
> > 
> > [    1.246852] OF: ERROR: Bad of_node_put() on /sound-wm8524
> > [    1.262261] Hardware name: NXP i.MX8MQ EVK (DT)
> > [    1.266807] Workqueue: events deferred_probe_work_func
> > [    1.271950] Call trace:
> > [    1.274406]  dump_backtrace+0x0/0x158
> > [    1.278074]  show_stack+0x14/0x20
> > [    1.281396]  dump_stack+0xa8/0xcc
> > [    1.284717]  of_node_release+0xb0/0xc8
> > [    1.288474]  kobject_put+0x74/0xf0
> > [    1.291879]  of_node_put+0x14/0x28
> > [    1.295286]  __of_get_next_child+0x44/0x70
> > [    1.299387]  of_get_next_child+0x3c/0x60
> > [    1.303315]  simple_for_each_link+0x1dc/0x230
> > [    1.307676]  simple_probe+0x80/0x540
> > [    1.311256]  platform_drv_probe+0x50/0xa0
> > 
> > This patch is based on an earlier version posted by Kuninori Morimoto
> > and commit message includes explanations from Mark Brown.
> > 
> > https://patchwork.kernel.org/patch/10814255/
> > 
> > Reported-by: Vicente Bergas <vicencb@...il.com>
> > Signed-off-by: Daniel Baluta <daniel.baluta@....com>
> > ---
> 
> I'm not sure which one is correct in this case
> 
> Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
> 
> or
> 
> Acked-by: Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>

And we want to add

Fixes: commit da215354eb55c ("ASoC: simple-card: merge simple-scu-card")