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

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Date:   Mon, 18 Feb 2019 07:06:19 +0000
From:   Daniel Baluta <daniel.baluta@....com>
To:     "kuninori.morimoto.gx@...esas.com" <kuninori.morimoto.gx@...esas.com>
CC:     dl-linux-imx <linux-imx@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "vicencb@...il.com" <vicencb@...il.com>,
        "broonie@...nel.org" <broonie@...nel.org>,
        "tiwai@...e.com" <tiwai@...e.com>,
        "lgirdwood@...il.com" <lgirdwood@...il.com>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "S.j. Wang" <shengjiu.wang@....com>,
        "alsa-devel@...a-project.org" <alsa-devel@...a-project.org>
Subject: Re: [PATCH] ASoC: simple-card: Fix refcount underflow

On Mon, 2019-02-18 at 10:37 +0900, Kuninori Morimoto wrote:
> 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://emea01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fpatchwork.kernel.org%2Fpatch%2F10814255%2F&amp;data=02%7C01%7Cdaniel.baluta%40nxp.com%7Ced1b7adc66a546c1bb4608d69541aaf8%7C686ea1d3bc2b4c6fa92cd99c5c301635%7C0%7C0%7C636860506617983174&amp;sdata=hTsurDLdtLAtTw0a5v%2FrSsleSawAP2yiVPl87%2BHCzTI%3D&amp;reserved=0
> > > 
> > > 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")
> 

Thanks! I thought about adding this but the current patch will not
cleanly apply because of:

2d01a84605a55c ("ASoC: simple-card: reduce naming prefix")