linux-kernel - [PATCH AUTOSEL 5.4 13/30] ASoC: SOF: Intel: hda-dai: fix potential locking issue

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Message-Id: <20211109222224.1235388-13-sashal@kernel.org>
Date:   Tue,  9 Nov 2021 17:22:07 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Mark Brown <broonie@...nel.org>, Takashi Iwai <tiwai@...e.de>,
        Sasha Levin <sashal@...nel.org>, lgirdwood@...il.com,
        perex@...ex.cz, tiwai@...e.com, alsa-devel@...a-project.org
Subject: [PATCH AUTOSEL 5.4 13/30] ASoC: SOF: Intel: hda-dai: fix potential locking issue

From: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>

[ Upstream commit a20f3b10de61add5e14b6ce4df982f4df2a4cbbc ]

The initial hdac_stream code was adapted a third time with the same
locking issues. Move the spin_lock outside the loops and make sure the
fields are protected on read/write.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
Acked-by: Mark Brown <broonie@...nel.org>
Link: https://lore.kernel.org/r/20210924192417.169243-5-pierre-louis.bossart@linux.intel.com
Signed-off-by: Takashi Iwai <tiwai@...e.de>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 sound/soc/sof/intel/hda-dai.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/sound/soc/sof/intel/hda-dai.c b/sound/soc/sof/intel/hda-dai.c
index 3f645200d3a5c..b3cdd10c83ae1 100644
--- a/sound/soc/sof/intel/hda-dai.c
+++ b/sound/soc/sof/intel/hda-dai.c
@@ -67,6 +67,7 @@ static struct hdac_ext_stream *
 		return NULL;
 	}
 
+	spin_lock_irq(&bus->reg_lock);
 	list_for_each_entry(stream, &bus->stream_list, list) {
 		struct hdac_ext_stream *hstream =
 			stream_to_hdac_ext_stream(stream);
@@ -106,12 +107,12 @@ static struct hdac_ext_stream *
 		 * is updated in snd_hdac_ext_stream_decouple().
 		 */
 		if (!res->decoupled)
-			snd_hdac_ext_stream_decouple(bus, res, true);
-		spin_lock_irq(&bus->reg_lock);
+			snd_hdac_ext_stream_decouple_locked(bus, res, true);
+
 		res->link_locked = 1;
 		res->link_substream = substream;
-		spin_unlock_irq(&bus->reg_lock);
 	}
+	spin_unlock_irq(&bus->reg_lock);
 
 	return res;
 }
-- 
2.33.0