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From: Sasha Levin <sashal@kernel.org>
To: Charles Keepax <ckeepax@opensource.cirrus.com>
Cc: linux-kernel@vger.kernel.org, stable@vger.kernel.org,
	Lucas Tanure <tanureal@opensource.cirrus.com>,
	Mark Brown <broonie@kernel.org>,
	patches@opensource.cirrus.com, alsa-devel@alsa-project.org
Subject: Re: [PATCH AUTOSEL 5.13 03/12] ASoC: wm_adsp: Let soc_cleanup_component_debugfs remove debugfs
Date: Thu, 19 Aug 2021 09:26:34 -0400	[thread overview]
Message-ID: <YR5cCqyVQRnDjuo3@sashalap> (raw)
In-Reply-To: <20210818131544.GL9223@ediswmail.ad.cirrus.com>

On Wed, Aug 18, 2021 at 01:15:44PM +0000, Charles Keepax wrote:
>On Mon, Aug 16, 2021 at 08:35:27PM -0400, Sasha Levin wrote:
>> From: Lucas Tanure <tanureal@opensource.cirrus.com>
>>
>> [ Upstream commit acbf58e530416e167c3b323111f4013d9f2b0a7d ]
>>
>> soc_cleanup_component_debugfs will debugfs_remove_recursive
>> the component->debugfs_root, so adsp doesn't need to also
>> remove the same entry.
>> By doing that adsp also creates a race with core component,
>> which causes a NULL pointer dereference
>>
>> Signed-off-by: Lucas Tanure <tanureal@opensource.cirrus.com>
>> Link: https://lore.kernel.org/r/20210728104416.636591-1-tanureal@opensource.cirrus.com
>> Signed-off-by: Mark Brown <broonie@kernel.org>
>> Signed-off-by: Sasha Levin <sashal@kernel.org>
>> ---
>>  sound/soc/codecs/wm_adsp.c | 1 -
>>  1 file changed, 1 deletion(-)
>>
>> diff --git a/sound/soc/codecs/wm_adsp.c b/sound/soc/codecs/wm_adsp.c
>> index cef05d81c39b..6698b5343974 100644
>> --- a/sound/soc/codecs/wm_adsp.c
>> +++ b/sound/soc/codecs/wm_adsp.c
>> @@ -746,7 +746,6 @@ static void wm_adsp2_init_debugfs(struct wm_adsp *dsp,
>>  static void wm_adsp2_cleanup_debugfs(struct wm_adsp *dsp)
>>  {
>>  	wm_adsp_debugfs_clear(dsp);
>> -	debugfs_remove_recursive(dsp->debugfs_root);
>>  }
>
>It might be better not to backport this patch to the stable
>kernels. The issue has only been seen on one out of tree driver
>and the patch looks a little off to me. This
>debugfs_remove_recursive should run before the
>soc_cleanup_component_debugfs one, and as such it's hard to see
>what is actually going on. We are currently investigating internally
>but we might end up reverting the change, and it only seems to be
>causing issues on the one not upstreamed part.
>
>Apologies for missing the review of this one when it went up
>Mark, I was on holiday at the time.

I'll drop it, it didn't go anywhere yet :) Thanks!

-- 
Thanks,
Sasha

  reply	other threads:[~2021-08-19 13:26 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-17  0:35 [PATCH AUTOSEL 5.13 01/12] ASoC: rt5682: Adjust headset volume button threshold Sasha Levin
2021-08-17  0:35 ` [PATCH AUTOSEL 5.13 02/12] ASoC: component: Remove misplaced prefix handling in pin control functions Sasha Levin
2021-08-30 12:49   ` Pavel Machek
2021-08-17  0:35 ` [PATCH AUTOSEL 5.13 03/12] ASoC: wm_adsp: Let soc_cleanup_component_debugfs remove debugfs Sasha Levin
2021-08-18 13:15   ` Charles Keepax
2021-08-19 13:26     ` Sasha Levin [this message]
2021-08-17  0:35 ` [PATCH AUTOSEL 5.13 04/12] platform/x86: Add and use a dual_accel_detect() helper Sasha Levin
2021-08-17  0:35 ` [PATCH AUTOSEL 5.13 05/12] ARC: Fix CONFIG_STACKDEPOT Sasha Levin
2021-08-17  0:35 ` [PATCH AUTOSEL 5.13 06/12] netfilter: ipset: Limit the maximal range of consecutive elements to add/delete Sasha Levin
2021-08-17  0:35 ` [PATCH AUTOSEL 5.13 07/12] netfilter: conntrack: collect all entries in one cycle Sasha Levin
2021-08-17  0:35 ` [PATCH AUTOSEL 5.13 08/12] once: Fix panic when module unload Sasha Levin
2021-08-17  0:35 ` [PATCH AUTOSEL 5.13 09/12] io_uring: rsrc ref lock needs to be IRQ safe Sasha Levin
2021-08-17  0:35 ` [PATCH AUTOSEL 5.13 10/12] blk-iocost: fix lockdep warning on blkcg->lock Sasha Levin
2021-08-17  0:35 ` [PATCH AUTOSEL 5.13 11/12] ovl: fix uninitialized pointer read in ovl_lookup_real_one() Sasha Levin
2021-08-17  0:35 ` [PATCH AUTOSEL 5.13 12/12] net: mscc: Fix non-GPL export of regmap APIs Sasha Levin

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