All components are initially given an empty card when registering platform,
and since the commit 6e78108bda78
("ASoC: core: Don't probe the component which is dummy")',
snd-soc-dummy will not be probed so that it remains an empty card assigned.
This patch ignores to iterate widget hooks to the 'snd-soc-dummy'
component, else it will trigger memory fault because of invalid dereference
address of card->widgets.
Test by grep -rsI "hello" /sys/devices/platform/skl_nau88l25_ssm4567_i2s/
Conflicts:
sound/soc/soc-dapm.c
Signed-off-by: Harry Pan <harry.pan@xxxxxxxxx>
---
sound/soc/soc-dapm.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c
index 581175a..0bc15c9 100644
--- a/sound/soc/soc-dapm.c
+++ b/sound/soc/soc-dapm.c
@@ -2188,6 +2188,9 @@ static ssize_t dapm_widget_show_component(struct snd_soc_component *cmpnt,
int count = 0;
char *state = "not set";
+ if (!strcmp(cmpnt->name, "snd-soc-dummy"))
+ return 0;
+
list_for_each_entry(w, &cmpnt->card->widgets, list) {
if (w->dapm != dapm)
continue;
--
2.1.2
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