[PATCH] ASoC: soc-core: Fix null pointer dereference

[Dimitris Papastamos <dp@opensource.wolfsonmicro.com>]

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>
---
 sound/soc/soc-core.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index 392d336..ecd9146 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;
 }
 
-- 
1.7.3.3