ASoC: SOF: ipc4-topology: Protect pipeline free with mutex

When starting/stopping multiple streams in parallel, pipeline triggers
and pipeline frees can get interleaved. So use the same mutex used for
pipeline trigger to protect the pipeline frees as well. Rename the
trigger_mutex to pipeline_state_mutex for more clarity.

Signed-off-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>

Author: ranj063

sound/soc/sof/ipc4-pcm.c

@@ -222,7 +222,7 @@ static int sof_ipc4_trigger_pipelines(struct snd_soc_component *component,
 	if (!trigger_list)
 		return -ENOMEM;
 
-	mutex_lock(&ipc4_data->trigger_mutex);
+	mutex_lock(&ipc4_data->pipeline_state_mutex);
 
 	/*
 	 * IPC4 requires pipelines to be triggered in order starting at the sink and
@@ -289,7 +289,7 @@ static int sof_ipc4_trigger_pipelines(struct snd_soc_component *component,
 	}
 
 free:
-	mutex_unlock(&ipc4_data->trigger_mutex);
+	mutex_unlock(&ipc4_data->pipeline_state_mutex);
 	kfree(trigger_list);
 	return ret;
 }

sound/soc/sof/ipc4-priv.h

@@ -70,7 +70,7 @@ struct sof_ipc4_fw_library {
  *		    base firmware
  *
  * @load_library: Callback function for platform dependent library loading
- * @trigger_mutex: Mutex to protect pipeline triggers, ref counts and states
+ * @pipeline_state_mutex: Mutex to protect pipeline triggers, ref counts, states and deletion
  */
 struct sof_ipc4_fw_data {
 	u32 manifest_fw_hdr_offset;
@@ -83,7 +83,7 @@ struct sof_ipc4_fw_data {
 
 	int (*load_library)(struct snd_sof_dev *sdev,
 			    struct sof_ipc4_fw_library *fw_lib, bool reload);
-	struct mutex trigger_mutex; /* protect pipeline triggers, ref counts and states */
+	struct mutex pipeline_state_mutex; /* protect pipeline triggers, ref counts and states */
 };
 
 extern const struct sof_ipc_fw_loader_ops ipc4_loader_ops;

sound/soc/sof/ipc4-topology.c

@@ -1794,8 +1794,11 @@ static int sof_ipc4_widget_setup(struct snd_sof_dev *sdev, struct snd_sof_widget
 static int sof_ipc4_widget_free(struct snd_sof_dev *sdev, struct snd_sof_widget *swidget)
 {
 	struct sof_ipc4_fw_module *fw_module = swidget->module_info;
+	struct sof_ipc4_fw_data *ipc4_data = sdev->private;
 	int ret = 0;
 
+	mutex_lock(&ipc4_data->pipeline_state_mutex);
+
 	/* freeing a pipeline frees all the widgets associated with it */
 	if (swidget->id == snd_soc_dapm_scheduler) {
 		struct sof_ipc4_pipeline *pipeline = swidget->private;
@@ -1821,6 +1824,8 @@ static int sof_ipc4_widget_free(struct snd_sof_dev *sdev, struct snd_sof_widget
 		ida_free(&fw_module->m_ida, swidget->instance_id);
 	}
 
+	mutex_unlock(&ipc4_data->pipeline_state_mutex);
+
 	return ret;
 }
 

sound/soc/sof/ipc4.c

@@ -662,7 +662,7 @@ static int sof_ipc4_init(struct snd_sof_dev *sdev)
 {
 	struct sof_ipc4_fw_data *ipc4_data = sdev->private;
 
-	mutex_init(&ipc4_data->trigger_mutex);
+	mutex_init(&ipc4_data->pipeline_state_mutex);
 
 	xa_init_flags(&ipc4_data->fw_lib_xa, XA_FLAGS_ALLOC);