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authorLars-Peter Clausen <lars@metafoo.de>2013-08-29 10:26:32 +0200
committerMark Brown <broonie@linaro.org>2013-08-29 13:32:40 +0100
commit194c753a214ba7f1497552dd530021884d164146 (patch)
treee8d9ab3aa7b2ad8160d7a77c077b999c453440ba /drivers/base
parent65c180fd95993abc31c8770e014ebedade46b623 (diff)
downloadlinux-194c753a214ba7f1497552dd530021884d164146.tar.bz2
regmap: rbtree: Simplify adjacent node look-up
A register which is adjacent to a node will either be left to the first register or right to the last register. It will not be within the node's range, so there is no point in checking for each register cached by the node whether the new register is next to it. It is sufficient to check whether the register comes before the first register or after the last register of the node. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Signed-off-by: Mark Brown <broonie@linaro.org>
Diffstat (limited to 'drivers/base')
-rw-r--r--drivers/base/regmap/regcache-rbtree.c39
1 files changed, 19 insertions, 20 deletions
diff --git a/drivers/base/regmap/regcache-rbtree.c b/drivers/base/regmap/regcache-rbtree.c
index f2384a816cc4..dbe5ea12c79b 100644
--- a/drivers/base/regmap/regcache-rbtree.c
+++ b/drivers/base/regmap/regcache-rbtree.c
@@ -352,9 +352,9 @@ static int regcache_rbtree_write(struct regmap *map, unsigned int reg,
struct regcache_rbtree_ctx *rbtree_ctx;
struct regcache_rbtree_node *rbnode, *rbnode_tmp;
struct rb_node *node;
+ unsigned int base_reg, top_reg;
unsigned int reg_tmp;
unsigned int pos;
- int i;
int ret;
rbtree_ctx = map->cache;
@@ -376,25 +376,24 @@ static int regcache_rbtree_write(struct regmap *map, unsigned int reg,
node = rb_next(node)) {
rbnode_tmp = rb_entry(node, struct regcache_rbtree_node,
node);
- for (i = 0; i < rbnode_tmp->blklen; i++) {
- reg_tmp = rbnode_tmp->base_reg +
- (i * map->reg_stride);
- if (abs(reg_tmp - reg) != map->reg_stride)
- continue;
- /* decide where in the block to place our register */
- if (reg_tmp + map->reg_stride == reg)
- pos = i + 1;
- else
- pos = i;
- ret = regcache_rbtree_insert_to_block(map,
- rbnode_tmp,
- pos, reg,
- value);
- if (ret)
- return ret;
- rbtree_ctx->cached_rbnode = rbnode_tmp;
- return 0;
- }
+
+ regcache_rbtree_get_base_top_reg(map, rbnode_tmp,
+ &base_reg, &top_reg);
+
+ /* decide where in the block to place our register */
+ if (base_reg > 0 && reg == base_reg - map->reg_stride)
+ pos = 0;
+ else if (reg > 0 && reg - map->reg_stride == top_reg)
+ pos = rbnode_tmp->blklen;
+ else
+ continue;
+
+ ret = regcache_rbtree_insert_to_block(map, rbnode_tmp,
+ pos, reg, value);
+ if (ret)
+ return ret;
+ rbtree_ctx->cached_rbnode = rbnode_tmp;
+ return 0;
}
/* We did not manage to find a place to insert it in