ASoC: soc-core: Fix null pointer dereference

In case the codec driver did not provide a read/write function,
codec->driver->read|write will be NULL.  Ensure that we use the one
specified in codec->read|write to avoid oopsing when we access
the debugfs entries.  This is achieved by using snd_soc_read() and
snd_soc_write().

Signed-off-by: Dimitris Papastamos <dp@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index b4c8c3800503..a14a0507bbd0 100644
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -117,7 +117,7 @@ static ssize_t soc_codec_reg_show(struct snd_soc_codec *codec, char *buf)
                          * the register being volatile and the device being
                          * powered off.
                          */
-                        ret = codec->driver->read(codec, i);
+                        ret = snd_soc_read(codec, i);
                         if (ret >= 0)
                                 count += snprintf(buf + count,
                                                   PAGE_SIZE - count,
@@ -228,7 +228,7 @@ static ssize_t codec_reg_write_file(struct file *file,
                 start++;
         if (strict_strtoul(start, 16, &value))
                 return -EINVAL;
-        codec->driver->write(codec, reg, value);
+        snd_soc_write(codec, reg, value);
         return buf_size;
 }