ASoC: Track which components have been registered with snd_soc_register_component()

snd_soc_unregister_component() takes the parent device of the component as a
parameter and then looks up the component based on this. This is a problem if
multiple components are registered for the same parent device. Currently drivers
do not do this, but some drivers register a CPU DAI component and a platform for
the same parent device. This will become a problem once platforms are also made
components. To make sure that snd_soc_unregister_component() will not
accidentally unregister the platform in such a case only consider components
that were registered with snd_soc_register_component(). This is only meant as
short term stopgap solution to be able to continue componentisation. Long term
we'll need something different.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@linaro.org>

2 files changed, 3 insertions, 1 deletions

diff --git a/include/sound/soc.h b/include/sound/soc.h
index a355d0f9a6f9..f8a79c17628e 100644
--- a/include/sound/soc.h
+++ b/include/sound/soc.h
@@ -662,6 +662,7 @@ struct snd_soc_component {
         unsigned int active;
 
         unsigned int ignore_pmdown_time:1; /* pmdown_time is ignored at stop */
+        unsigned int registered_as_component:1;
 
         struct list_head list;
 
diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index 41bd24348520..3314efb365e3 100644
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -3879,6 +3879,7 @@ int snd_soc_register_component(struct device *dev,
         }
 
         cmpnt->ignore_pmdown_time = true;
+        cmpnt->registered_as_component = true;
 
         return __snd_soc_register_component(dev, cmpnt, cmpnt_drv, NULL,
                                             dai_drv, num_dai, true);
@@ -3894,7 +3895,7 @@ void snd_soc_unregister_component(struct device *dev)
         struct snd_soc_component *cmpnt;
 
         list_for_each_entry(cmpnt, &component_list, list) {
-                if (dev == cmpnt->dev)
+                if (dev == cmpnt->dev && cmpnt->registered_as_component)
                         goto found;
         }
         return;