ASoC: wm_adsp: Correct some missing locking

The recent refactoring overlooked some places which should be covered by
the pwr_lock, all code that affects or depends on the power status of
the DSP should be covered, this patch adds the missing coverage.
Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/wm_adsp.c

@@ -2552,6 +2552,8 @@ int wm_adsp2_early_event(struct snd_soc_dapm_widget *w,
 		queue_work(system_unbound_wq, &dsp->boot_work);
 		break;
 	case SND_SOC_DAPM_PRE_PMD:
+		mutex_lock(&dsp->pwr_lock);
+
 		wm_adsp_debugfs_clear(dsp);
 
 		dsp->fw_id = 0;
@@ -2567,6 +2569,8 @@ int wm_adsp2_early_event(struct snd_soc_dapm_widget *w,
 
 		wm_adsp_free_alg_regions(dsp);
 
+		mutex_unlock(&dsp->pwr_lock);
+
 		adsp_dbg(dsp, "Shutdown complete\n");
 		break;
 	default:
@@ -2589,8 +2593,12 @@ int wm_adsp2_event(struct snd_soc_dapm_widget *w,
 	case SND_SOC_DAPM_POST_PMU:
 		flush_work(&dsp->boot_work);
 
-		if (!dsp->booted)
-			return -EIO;
+		mutex_lock(&dsp->pwr_lock);
+
+		if (!dsp->booted) {
+			ret = -EIO;
+			goto err;
+		}
 
 		ret = wm_adsp2_ena(dsp);
 		if (ret != 0)
@@ -2610,14 +2618,10 @@ int wm_adsp2_event(struct snd_soc_dapm_widget *w,
 
 		dsp->running = true;
 
-		mutex_lock(&dsp->pwr_lock);
-
 		if (wm_adsp_fw[dsp->fw].num_caps != 0) {
 			ret = wm_adsp_buffer_init(dsp);
-			if (ret < 0) {
-				mutex_unlock(&dsp->pwr_lock);
+			if (ret < 0)
 				goto err;
-			}
 		}
 
 		mutex_unlock(&dsp->pwr_lock);
@@ -2662,6 +2666,7 @@ int wm_adsp2_event(struct snd_soc_dapm_widget *w,
 err:
 	regmap_update_bits(dsp->regmap, dsp->base + ADSP2_CONTROL,
 			   ADSP2_SYS_ENA | ADSP2_CORE_ENA | ADSP2_START, 0);
+	mutex_unlock(&dsp->pwr_lock);
 	return ret;
 }
 EXPORT_SYMBOL_GPL(wm_adsp2_event);