ASoC: fix NULL pointer dereference in soc_suspend()

In case the initalization of an soc_device failed, there is no codec
associated with it. soc_suspend() will still dereference the pointer
and cause an Ooops when entering the sleep mode.

This happens on our board with a multi-target kernel image when booted
on a machine without audio circuits.

This patch makes the code bail out very early in this special case.

Signed-off-by: Daniel Mack <daniel@caiaq.de>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index 4aa8e2d35061..3f44150d8e30 100644
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -628,6 +628,12 @@ static int soc_suspend(struct platform_device *pdev, pm_message_t state)
         struct snd_soc_codec *codec = card->codec;
         int i;
 
+        /* If the initialization of this soc device failed, there is no codec
+         * associated with it. Just bail out in this case.
+         */
+        if (!codec)
+                return 0;
+
         /* Due to the resume being scheduled into a workqueue we could
         * suspend before that's finished - wait for it to complete.
          */