ASoC: io: Don't dereference regmap if we failed to get one

Avoids a crash in invalid configurations.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@ti.com>

1 files changed, 7 insertions, 4 deletions

diff --git a/sound/soc/soc-io.c b/sound/soc/soc-io.c
index 44d0174b4d97..29183ef2b93d 100644
--- a/sound/soc/soc-io.c
+++ b/sound/soc/soc-io.c
@@ -145,10 +145,13 @@ int snd_soc_codec_set_cache_io(struct snd_soc_codec *codec,
                 if (!codec->control_data)
                         codec->control_data = dev_get_regmap(codec->dev, NULL);
 
-                ret = regmap_get_val_bytes(codec->control_data);
-                /* Errors are legitimate for non-integer byte multiples */
-                if (ret > 0)
-                        codec->val_bytes = ret;
+                if (codec->control_data) {
+                        ret = regmap_get_val_bytes(codec->control_data);
+                        /* Errors are legitimate for non-integer byte
+                         * multiples */
+                        if (ret > 0)
+                                codec->val_bytes = ret;
+                }
                 break;
 
         default: