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| author | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2011-10-04 22:05:47 +0100 |
|---|---|---|
| committer | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2011-10-09 12:36:56 +0100 |
| commit | f094fea68f0575286c55c06141cc89ffd0049024 (patch) | |
| tree | 6e6ff489fd8e445ff3b1e1a33e7488395d841e1b | |
| parent | 0eef6b0415f58ed16aff95af8c92514ce5c01258 (diff) | |
| download | talos-op-linux-f094fea68f0575286c55c06141cc89ffd0049024.tar.gz talos-op-linux-f094fea68f0575286c55c06141cc89ffd0049024.zip | |
regmap: Use bsearch() to search the register defaults
Rather than open coding a binary search use the standard bsearch() using
the comparison function we're already using for sort() on insert. This
fixes a lockup I was observing due to iterating on min <= max rather
than min < max when we fail to look up.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Dimitris Papastamos <dp@opensource.wolfsonmicro.com>
| -rw-r--r-- | drivers/base/regmap/regcache.c | 40 |
1 files changed, 20 insertions, 20 deletions
diff --git a/drivers/base/regmap/regcache.c b/drivers/base/regmap/regcache.c index b10e38fa0e3f..c5379c86de88 100644 --- a/drivers/base/regmap/regcache.c +++ b/drivers/base/regmap/regcache.c @@ -12,6 +12,7 @@ #include <linux/slab.h> #include <trace/events/regmap.h> +#include <linux/bsearch.h> #include <linux/sort.h> #include "internal.h" @@ -355,25 +356,7 @@ unsigned int regcache_get_val(const void *base, unsigned int idx, return -1; } -int regcache_lookup_reg(struct regmap *map, unsigned int reg) -{ - unsigned int min, max, index; - - min = 0; - max = map->num_reg_defaults - 1; - do { - index = (min + max) / 2; - if (map->reg_defaults[index].reg == reg) - return index; - if (map->reg_defaults[index].reg < reg) - min = index + 1; - else - max = index; - } while (min <= max); - return -1; -} - -static int regcache_insert_cmp(const void *a, const void *b) +static int regcache_default_cmp(const void *a, const void *b) { const struct reg_default *_a = a; const struct reg_default *_b = b; @@ -381,6 +364,23 @@ static int regcache_insert_cmp(const void *a, const void *b) return _a->reg - _b->reg; } +int regcache_lookup_reg(struct regmap *map, unsigned int reg) +{ + struct reg_default key; + struct reg_default *r; + + key.reg = reg; + key.def = 0; + + r = bsearch(&key, map->reg_defaults, map->num_reg_defaults, + sizeof(struct reg_default), regcache_default_cmp); + + if (r) + return r - map->reg_defaults; + else + return -1; +} + int regcache_insert_reg(struct regmap *map, unsigned int reg, unsigned int val) { @@ -396,6 +396,6 @@ int regcache_insert_reg(struct regmap *map, unsigned int reg, map->reg_defaults[map->num_reg_defaults - 1].reg = reg; map->reg_defaults[map->num_reg_defaults - 1].def = val; sort(map->reg_defaults, map->num_reg_defaults, - sizeof(struct reg_default), regcache_insert_cmp, NULL); + sizeof(struct reg_default), regcache_default_cmp, NULL); return 0; } |
