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From:   Stefan Binding <sbinding@opensource.cirrus.com>
To:     Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.com>
CC:     <alsa-devel@alsa-project.org>, <linux-kernel@vger.kernel.org>,
        <patches@opensource.cirrus.com>,
        Stefan Binding <sbinding@opensource.cirrus.com>
Subject: [PATCH v1 2/5] ALSA: hda: hda_cs_dsp_ctl: Ensure pwr_lock is held before reading/writing controls
Date:   Tue, 11 Oct 2022 15:35:49 +0100
Message-ID: <20221011143552.621792-3-sbinding@opensource.cirrus.com>
In-Reply-To: <20221011143552.621792-1-sbinding@opensource.cirrus.com>
References: <20221011143552.621792-1-sbinding@opensource.cirrus.com>
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These apis require the pwr_lock to be held.

Signed-off-by: Stefan Binding <sbinding@opensource.cirrus.com>
---
 sound/pci/hda/hda_cs_dsp_ctl.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/sound/pci/hda/hda_cs_dsp_ctl.c b/sound/pci/hda/hda_cs_dsp_ctl.c
index 41d3e8fd289d7..75fb691858172 100644
--- a/sound/pci/hda/hda_cs_dsp_ctl.c
+++ b/sound/pci/hda/hda_cs_dsp_ctl.c
@@ -199,11 +199,14 @@ EXPORT_SYMBOL_NS_GPL(hda_cs_dsp_control_remove, SND_HDA_CS_DSP_CONTROLS);
 int hda_cs_dsp_write_ctl(struct cs_dsp *dsp, const char *name, int type,
 			 unsigned int alg, const void *buf, size_t len)
 {
-	struct cs_dsp_coeff_ctl *cs_ctl = cs_dsp_get_ctl(dsp, name, type, alg);
+	struct cs_dsp_coeff_ctl *cs_ctl;
 	struct hda_cs_dsp_coeff_ctl *ctl;
 	int ret;
 
+	mutex_lock(&dsp->pwr_lock);
+	cs_ctl = cs_dsp_get_ctl(dsp, name, type, alg);
 	ret = cs_dsp_coeff_write_ctrl(cs_ctl, 0, buf, len);
+	mutex_unlock(&dsp->pwr_lock);
 	if (ret)
 		return ret;
 
@@ -221,7 +224,13 @@ EXPORT_SYMBOL_NS_GPL(hda_cs_dsp_write_ctl, SND_HDA_CS_DSP_CONTROLS);
 int hda_cs_dsp_read_ctl(struct cs_dsp *dsp, const char *name, int type,
 			unsigned int alg, void *buf, size_t len)
 {
-	return cs_dsp_coeff_read_ctrl(cs_dsp_get_ctl(dsp, name, type, alg), 0, buf, len);
+	int ret;
+
+	mutex_lock(&dsp->pwr_lock);
+	ret = cs_dsp_coeff_read_ctrl(cs_dsp_get_ctl(dsp, name, type, alg), 0, buf, len);
+	mutex_unlock(&dsp->pwr_lock);
+
+	return ret;
 
 }
 EXPORT_SYMBOL_NS_GPL(hda_cs_dsp_read_ctl, SND_HDA_CS_DSP_CONTROLS);
-- 
2.34.1