[PATCH 4.2.y-ckt 04/59] ASoC: dapm: Make sure we have a card when displaying component widgets

[Kamal Mostafa]

4.2.8-ckt10 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: Mark Brown <broonie at kernel.org>

commit 47325078f2a3e543150e7df967e45756b2fff7ec upstream.

The dummy component is reused for all cards so we special case and don't
bind it to any of them.  This means that code like that displaying the
component widgets that tries to look at the card will crash.  In the
future we will fix this by ensuring that the dummy component looks like
other components but that is invasive and so not suitable for a fix.
Instead add a special case check here.

Reported-by: Harry Pan <harry.pan at intel.com>
Suggested-by: Lars-Peter Clausen <lars at metafoo.de>
Signed-off-by: Mark Brown <broonie at kernel.org>
[ kamal: backport to 4.2-stable ]
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
---
 sound/soc/soc-dapm.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c
index 0859a3f..dfd4405 100644
--- a/sound/soc/soc-dapm.c
+++ b/sound/soc/soc-dapm.c
@@ -2229,6 +2229,13 @@ static ssize_t dapm_widget_show_codec(struct snd_soc_codec *codec, char *buf)
 	int count = 0;
 	char *state = "not set";
 
+	/* card won't be set for the dummy component, as a spot fix
+	 * we're checking for that case specifically here but in future
+	 * we will ensure that the dummy component looks like others.
+	 */
+	if (!codec->component.card)
+		return 0;
+
 	list_for_each_entry(w, &codec->component.card->widgets, list) {
 		if (w->dapm != &codec->dapm)
 			continue;
-- 
2.7.4