linux-kernel - [PATCH] ASoC: wm_adsp: Fix missing mutex_lock in wm_adsp_write

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Date: Thu, 7 Mar 2024 11:02:27 +0000
From: Richard Fitzgerald <rf@...nsource.cirrus.com>
To: <broonie@...nel.org>
CC: <linux-sound@...r.kernel.org>, <alsa-devel@...a-project.org>,
        <linux-kernel@...r.kernel.org>, <patches@...nsource.cirrus.com>,
        "Richard
 Fitzgerald" <rf@...nsource.cirrus.com>
Subject: [PATCH] ASoC: wm_adsp: Fix missing mutex_lock in wm_adsp_write_ctl()

wm_adsp_write_ctl() must hold the pwr_lock mutex when calling
cs_dsp_get_ctl().

This was previously partially fixed by commit 781118bc2fc1
("ASoC: wm_adsp: Fix missing locking in wm_adsp_[read|write]_ctl()")
but this only put locking around the call to cs_dsp_coeff_write_ctrl(),
missing the call to cs_dsp_get_ctl().

Signed-off-by: Richard Fitzgerald <rf@...nsource.cirrus.com>
Fixes: 781118bc2fc1 ("ASoC: wm_adsp: Fix missing locking in wm_adsp_[read|write]_ctl()")
---
 sound/soc/codecs/wm_adsp.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/sound/soc/codecs/wm_adsp.c b/sound/soc/codecs/wm_adsp.c
index e451c009f2d9..7d5c096e06cd 100644
--- a/sound/soc/codecs/wm_adsp.c
+++ b/sound/soc/codecs/wm_adsp.c
@@ -683,11 +683,12 @@ static void wm_adsp_control_remove(struct cs_dsp_coeff_ctl *cs_ctl)
 int wm_adsp_write_ctl(struct wm_adsp *dsp, const char *name, int type,
 		      unsigned int alg, void *buf, size_t len)
 {
-	struct cs_dsp_coeff_ctl *cs_ctl = cs_dsp_get_ctl(&dsp->cs_dsp, name, type, alg);
+	struct cs_dsp_coeff_ctl *cs_ctl;
 	struct wm_coeff_ctl *ctl;
 	int ret;
 
 	mutex_lock(&dsp->cs_dsp.pwr_lock);
+	cs_ctl = cs_dsp_get_ctl(&dsp->cs_dsp, name, type, alg);
 	ret = cs_dsp_coeff_write_ctrl(cs_ctl, 0, buf, len);
 	mutex_unlock(&dsp->cs_dsp.pwr_lock);
 
-- 
2.30.2