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

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Date:	Thu,  6 Sep 2012 16:45:32 +0300
From:	Pantelis Antoniou <panto@...oniou-consulting.com>
To:	linux-kernel@...r.kernel.org
Cc:	patches@...nsource.wolfsonmicro.com,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	linux-omap@...r.kernel.org,
	Pantelis Antoniou <panto@...oniou-consulting.com>
Subject: [PATCH] Don't clobber access methods when !regmap

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@...oniou-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

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