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 781118b
("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@opensource.cirrus.com>
Fixes: 781118b ("ASoC: wm_adsp: Fix missing locking in wm_adsp_[read|write]_ctl()")
Link: https://msgid.link/r/20240307110227.41421-1-rf@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: rfvirgil

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);