[PATCH] staging: greybus: add meaningful comments to mutex declarations

[suryasaimadhu]

The gbaudio_codec_info struct has two mutexes whose purpose was
not documented:

- lock: serializes DAI stream enable/disable operations and
  module_list/dai_list access in gbaudio_module_update() and
  gbcodec DAI ops
- register_mutex: serializes module register/unregister operations
  including DAPM controls, widgets and routes in
  gbaudio_register_module() and gbaudio_unregister_module()

Signed-off-by: suryasaimadhu <suryasaimadhu369@xxxxxxxxx>
---
 drivers/staging/greybus/audio_codec.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/staging/greybus/audio_codec.h b/drivers/staging/greybus/audio_codec.h
index f3f7a7ec6..3d92ac8a0 100644
--- a/drivers/staging/greybus/audio_codec.h
+++ b/drivers/staging/greybus/audio_codec.h
@@ -70,7 +70,15 @@ struct gbaudio_codec_info {
 	struct list_head module_list;
 	/* to maintain runtime stream params for each DAI */
 	struct list_head dai_list;
+	/*
+	 * held during DAI stream ops and module_list/dai_list
+	 * access (gbaudio_module_update, gbcodec DAI ops)
+	 */
 	struct mutex lock;
+	/*
+	 * held during module register/unregister including
+	 * DAPM controls, widgets and routes
+	 */
 	struct mutex register_mutex;
 };
 
-- 
2.47.3