linux-kernel - [PATCH AUTOSEL 4.20 10/77] ASoC: soc-core: Hold client_mutex around soc_init_dai

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Date:   Thu, 14 Feb 2019 21:07:48 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Rohit kumar <rohitkr@...eaurora.org>,
        Ajit Pandey <ajitp@...eaurora.org>,
        Mark Brown <broonie@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH AUTOSEL 4.20 10/77] ASoC: soc-core: Hold client_mutex around soc_init_dai_link()

From: Rohit kumar <rohitkr@...eaurora.org>

[ Upstream commit 04eb1efcd614d6f067b76a355b3a3599667959dc ]

soc_init_dai_link() calls soc_find_component() which needs
to be within client_mutex lock. Add client_mutex lock around
soc_init_dai_link() in snd_soc_register_card() to avoid
lockdep warning.

Fixes: 8780cf1142a5 ("ASoC: soc-core: defer card probe until all component is added to list")
Reported-by: Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
Signed-off-by: Rohit kumar <rohitkr@...eaurora.org>
Signed-off-by: Ajit Pandey <ajitp@...eaurora.org>
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 sound/soc/soc-core.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index 74b12f90ea9b..0b91d8fc6ca2 100644
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -1027,6 +1027,7 @@ static int snd_soc_init_platform(struct snd_soc_card *card,
 				 struct snd_soc_dai_link *dai_link)
 {
 	struct snd_soc_dai_link_component *platform = dai_link->platform;
+
 	/*
 	 * FIXME
 	 *
@@ -2754,15 +2755,18 @@ int snd_soc_register_card(struct snd_soc_card *card)
 	if (!card->name || !card->dev)
 		return -EINVAL;
 
+	mutex_lock(&client_mutex);
 	for_each_card_prelinks(card, i, link) {
 
 		ret = soc_init_dai_link(card, link);
 		if (ret) {
 			dev_err(card->dev, "ASoC: failed to init link %s\n",
 				link->name);
+			mutex_unlock(&client_mutex);
 			return ret;
 		}
 	}
+	mutex_unlock(&client_mutex);
 
 	dev_set_drvdata(card->dev, card);
 
-- 
2.19.1