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regmap: rbtree: Factor out node allocation 

In preparation for being slightly smarter about how we allocate memory
factor out the node allocation.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Mark Brown 2013-05-08 13:55:24 +01:00
parent 154881e59b
commit 0186645d25
1 changed files with 27 additions and 14 deletions
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41
drivers/base/regmap/regcache-rbtree.c
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@ -304,6 +304,27 @@ static int regcache_rbtree_insert_to_block(struct regmap *map,
return 0;
}
static struct regcache_rbtree_node *
regcache_rbtree_node_alloc(struct regmap *map, unsigned int reg)
{
struct regcache_rbtree_node *rbnode;
rbnode = kzalloc(sizeof(*rbnode), GFP_KERNEL);
if (!rbnode)
return NULL;
rbnode->blklen = sizeof(*rbnode);
rbnode->base_reg = reg;
rbnode->block = kmalloc(rbnode->blklen * map->cache_word_size,
GFP_KERNEL);
if (!rbnode->block) {
kfree(rbnode);
return NULL;
}
return rbnode;
}
static int regcache_rbtree_write(struct regmap *map, unsigned int reg,
unsigned int value)
{
@ -354,23 +375,15 @@ static int regcache_rbtree_write(struct regmap *map, unsigned int reg,
return 0;
}
}
/* we did not manage to find a place to insert it in an existing
* block so create a new rbnode with a single register in its block.
* This block will get populated further if any other adjacent
* registers get modified in the future.
/* We did not manage to find a place to insert it in
* an existing block so create a new rbnode.
*/
rbnode = kzalloc(sizeof *rbnode, GFP_KERNEL);
rbnode = regcache_rbtree_node_alloc(map, reg);
if (!rbnode)
return -ENOMEM;
rbnode->blklen = sizeof(*rbnode);
rbnode->base_reg = reg;
rbnode->block = kmalloc(rbnode->blklen * map->cache_word_size,
GFP_KERNEL);
if (!rbnode->block) {
kfree(rbnode);
return -ENOMEM;
}
regcache_rbtree_set_register(map, rbnode, 0, value);
regcache_rbtree_set_register(map, rbnode,
reg - rbnode->base_reg, value);
regcache_rbtree_insert(map, &rbtree_ctx->root, rbnode);
rbtree_ctx->cached_rbnode = rbnode;
}