ASoC: SOF: sof-audio: flag errors on pipeline teardown

Before suspending, walk through all the widgets to make sure all
refcounts are zero. If not, the resume will not work and random errors
will be reported. Adding this paranoia check will help identify leaks
and broken sequences.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Rander Wang <rander.wang@intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Reviewed-by: Péter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Link: https://lore.kernel.org/r/20220421203201.1550328-9-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/sof/ipc3-topology.c b/sound/soc/sof/ipc3-topology.c
index 572bcbf..3d00d37 100644 (file)
--- a/sound/soc/sof/ipc3-topology.c
+++ b/sound/soc/sof/ipc3-topology.c
@@ -2247,6 +2247,18 @@ static int sof_ipc3_tear_down_all_pipelines(struct snd_sof_dev *sdev, bool verif
        list_for_each_entry(sroute, &sdev->route_list, list)
                sroute->setup = false;
 
+       /*
+        * before suspending, make sure the refcounts are all zeroed out. There's no way
+        * to recover at this point but this will help root cause bad sequences leading to
+        * more issues on resume
+        */
+       list_for_each_entry(swidget, &sdev->widget_list, list) {
+               if (swidget->use_count != 0) {
+                       dev_err(sdev->dev, "%s: widget %s is still in use: count %d\n",
+                               __func__, swidget->widget->name, swidget->use_count);
+               }
+       }
+
        return 0;
 }