linux-kernel - Re: [PATCH AUTOSEL 5.0 107/262] ASoC: qcom: Fix of-node refcount unbalance in apq8016_sbc_parse

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Date:   Wed, 3 Apr 2019 12:25:47 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     Mark Brown <broonie@...nel.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Takashi Iwai <tiwai@...e.de>,
        Patrick Lai <plai@...eaurora.org>,
        Banajit Goswami <bgoswami@...eaurora.org>
Subject: Re: [PATCH AUTOSEL 5.0 107/262] ASoC: qcom: Fix of-node refcount
 unbalance in apq8016_sbc_parse_of()

On Wed, Mar 27, 2019 at 07:31:15PM +0000, Mark Brown wrote:
>On Wed, Mar 27, 2019 at 01:59:22PM -0400, Sasha Levin wrote:
>> From: Takashi Iwai <tiwai@...e.de>
>>
>> [ Upstream commit 8d1667200850f8753c0265fa4bd25c9a6e5f94ce ]
>>
>> The apq8016 driver leaves the of-node refcount at aborting from the
>> loop of for_each_child_of_node() in the error path.  Not only the
>> iterator node of for_each_child_of_node(), the children nodes referred
>> from it for codec and cpu have to be properly unreferenced.
>
>Given that the device tree is entirely static on all platforms using FDT
>I'm not convinced that it is sensible to backport any of the fixes for
>references not being dropped that are more than one liners,
>realistically nothing is ever going to notice the extra references but
>there are things that will notice if we underflow references so there's
>some risk we could break things somehow.  Seems like it's all risk for
>zero benefit.

Fair enough, I'll drop it. Thanks!

--
Thanks,
Sasha