linux-kernel - [PATCH 2/7] regmap: Make reg_config reg

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Date:	Wed, 16 Nov 2011 16:28:17 +0100
From:	Lars-Peter Clausen <lars@...afoo.de>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Dimitris Papastamos <dp@...nsource.wolfsonmicro.com>,
	Jonathan Cameron <jic23@...nel.org>
CC:	Michael Hennerich <michael.hennerich@...log.com>,
	<linux-kernel@...r.kernel.org>, <linux-iio@...r.kernel.org>,
	<device-drivers-devel@...ckfin.uclinux.org>, <drivers@...log.com>,
	Lars-Peter Clausen <lars@...afoo.de>
Subject: [PATCH 2/7] regmap: Make reg_config reg_defaults const

The reg_defaults field usually points to a static per driver array, which should
not be modified. Make requirement this explicit by making reg_defaults const.
To allow this the regcache_init code needs some minor changes. Previoulsy the
reg_config was not available in regcache_init and regmap->reg_defaults was used
to pass the default register set to regcache_init. Now that the reg_config is
available we can work on it directly.

Signed-off-by: Lars-Peter Clausen <lars@...afoo.de>
---
 drivers/base/regmap/regcache.c |    5 ++---
 include/linux/regmap.h         |    2 +-
 2 files changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/base/regmap/regcache.c b/drivers/base/regmap/regcache.c
index 0ad6cfb..d687df6 100644
--- a/drivers/base/regmap/regcache.c
+++ b/drivers/base/regmap/regcache.c
@@ -108,7 +108,6 @@ int regcache_init(struct regmap *map, const struct regmap_config *config)
 		return -EINVAL;
 	}
 
-	map->reg_defaults = config->reg_defaults;
 	map->num_reg_defaults = config->num_reg_defaults;
 	map->num_reg_defaults_raw = config->num_reg_defaults_raw;
 	map->reg_defaults_raw = config->reg_defaults_raw;
@@ -127,10 +126,10 @@ int regcache_init(struct regmap *map, const struct regmap_config *config)
 	 * won't vanish from under us.  We'll need to make
 	 * a copy of it.
 	 */
-	if (map->reg_defaults) {
+	if (config->reg_defaults) {
 		if (!map->num_reg_defaults)
 			return -EINVAL;
-		tmp_buf = kmemdup(map->reg_defaults, map->num_reg_defaults *
+		tmp_buf = kmemdup(config->reg_defaults, map->num_reg_defaults *
 				  sizeof(struct reg_default), GFP_KERNEL);
 		if (!tmp_buf)
 			return -ENOMEM;
diff --git a/include/linux/regmap.h b/include/linux/regmap.h
index 1e4ec2b..458f15f 100644
--- a/include/linux/regmap.h
+++ b/include/linux/regmap.h
@@ -83,7 +83,7 @@ struct regmap_config {
 	bool (*precious_reg)(struct device *dev, unsigned int reg);
 
 	unsigned int max_register;
-	struct reg_default *reg_defaults;
+	const struct reg_default *reg_defaults;
 	unsigned int num_reg_defaults;
 	enum regcache_type cache_type;
 	const void *reg_defaults_raw;
-- 
1.7.7.1


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