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@intel.com --- 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;