linux-kernel - [PATCH] regmap: Allow rbtree to cache zero default values

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Date:	Sun,  9 Oct 2011 14:30:31 +0100
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	dp@...nsource.wolfsonmicro.com
Cc:	linux-kernel@...r.kernel.org, patches@...nsource.wolfsonmicro.com,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Subject: [PATCH] regmap: Allow rbtree to cache zero default values

Ensure that when we start up in cache only mode we can store defaults of
zero, otherwise if the hardware is unavailable we won't be able to read.

Signed-off-by: Mark Brown <broonie@...nsource.wolfsonmicro.com>
---
 drivers/base/regmap/regcache-rbtree.c |    3 ---
 1 files changed, 0 insertions(+), 3 deletions(-)

diff --git a/drivers/base/regmap/regcache-rbtree.c b/drivers/base/regmap/regcache-rbtree.c
index e04e36e..e314984 100644
--- a/drivers/base/regmap/regcache-rbtree.c
+++ b/drivers/base/regmap/regcache-rbtree.c
@@ -252,9 +252,6 @@ static int regcache_rbtree_write(struct regmap *map, unsigned int reg,
 		regcache_rbtree_set_register(rbnode, reg_tmp, value,
 					     map->cache_word_size);
 	} else {
-		/* bail out early, no need to create the rbnode yet */
-		if (!value)
-			return 0;
 		/* look for an adjacent register to the one we are about to add */
 		for (node = rb_first(&rbtree_ctx->root); node;
 		     node = rb_next(node)) {
-- 
1.7.6.3

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