[PATCH] Don't clobber access methods when !regmap

[Pantelis Antoniou <panto@antoniou-consulting.com>]

A snd-soc driver that doesn't support regmap blow up horribly
when you assume that regmap is available. Fix it by marking
the driver as not supporting regmap & not clobbering the codec
access methods.

This is immediately noticeable on the beagleboard where we crash,
since we might have REGMAP enabled, but it doesn't mean that the
omap driver uses it.

Signed-off-by: Pantelis Antoniou <panto@antoniou-consulting.com>

---
 sound/soc/soc-io.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/sound/soc/soc-io.c b/sound/soc/soc-io.c
index 29183ef..4e5b4ae 100644
--- a/sound/soc/soc-io.c
+++ b/sound/soc/soc-io.c
@@ -117,9 +117,6 @@ int snd_soc_codec_set_cache_io(struct snd_soc_codec *codec,
 	int ret;
 
 	memset(&config, 0, sizeof(config));
-	codec->write = hw_write;
-	codec->read = hw_read;
-	codec->bulk_write_raw = snd_soc_hw_bulk_write_raw;
 
 	config.reg_bits = addr_bits;
 	config.val_bits = data_bits;
@@ -151,7 +148,9 @@ int snd_soc_codec_set_cache_io(struct snd_soc_codec *codec,
 			 * multiples */
 			if (ret > 0)
 				codec->val_bytes = ret;
-		}
+		} else
+			codec->using_regmap = false;
+
 		break;
 
 	default:
@@ -161,6 +160,13 @@ int snd_soc_codec_set_cache_io(struct snd_soc_codec *codec,
 	if (IS_ERR(codec->control_data))
 		return PTR_ERR(codec->control_data);
 
+	/* only when using regmap; don't modify unconditionally */
+	if (codec->using_regmap) {
+		codec->write = hw_write;
+		codec->read = hw_read;
+		codec->bulk_write_raw = snd_soc_hw_bulk_write_raw;
+	}
+
 	return 0;
 }
 EXPORT_SYMBOL_GPL(snd_soc_codec_set_cache_io);
-- 
1.7.12