commit: http://blackfin.uclinux.org/git/?p=linux-kernel;a=commitdiff;h=f6275ab1564f8e7a44d1774da492db545ee8c3b4 branch: http://blackfin.uclinux.org/git/?p=linux-kernel;a=shortlog;h=refs/heads/2011R1
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 <[email protected]> Acked-by: Dimitris Papastamos <[email protected]> --- 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 b10e38f..c5379c8 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; }
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