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regmap: Optimisation fixes for debugfs

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The debugfs optimisations merged in v3.8 weren't my finest hour, there
 were a number of cases that the more complex algorithm made worse
 especially around the error handling. This patch series should address
 those issues.
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Merge tag 'regmap-debugfs-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap

Pull regmap debugfs optimisation fixes from Mark Brown:
 "The debugfs optimisations merged in v3.8 weren't my finest hour, there
  were a number of cases that the more complex algorithm made worse
  especially around the error handling.  This patch series should
  address those issues."

* tag 'regmap-debugfs-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap:
  regmap: debugfs: Make sure we store the last entry in the offset cache
  regmap: debugfs: Ensure a correct return value for empty caches
  regmap: debugfs: Discard the cache if we fail to allocate an entry
  regmap: debugfs: Fix check for block start in cached seeks
  regmap: debugfs: Fix attempts to read nonexistant register blocks
This commit is contained in:
Linus Torvalds 2013-01-14 20:20:44 -08:00
commit 7dea1ff3b7
1 changed files with 40 additions and 13 deletions
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53
drivers/base/regmap/regmap-debugfs.c
View file

@ -56,6 +56,19 @@ static const struct file_operations regmap_name_fops = {
.llseek = default_llseek,
};
static void regmap_debugfs_free_dump_cache(struct regmap *map)
{
struct regmap_debugfs_off_cache *c;
while (!list_empty(&map->debugfs_off_cache)) {
c = list_first_entry(&map->debugfs_off_cache,
struct regmap_debugfs_off_cache,
list);
list_del(&c->list);
kfree(c);
}
}
/*
* Work out where the start offset maps into register numbers, bearing
* in mind that we suppress hidden registers.
@ -91,8 +104,10 @@ static unsigned int regmap_debugfs_get_dump_start(struct regmap *map,
/* No cache entry? Start a new one */
if (!c) {
c = kzalloc(sizeof(*c), GFP_KERNEL);
if (!c)
break;
if (!c) {
regmap_debugfs_free_dump_cache(map);
return base;
}
c->min = p;
c->base_reg = i;
}
@ -101,14 +116,34 @@ static unsigned int regmap_debugfs_get_dump_start(struct regmap *map,
}
}
/* Close the last entry off if we didn't scan beyond it */
if (c) {
c->max = p - 1;
list_add_tail(&c->list,
&map->debugfs_off_cache);
} else {
return base;
}
/*
* This should never happen; we return above if we fail to
* allocate and we should never be in this code if there are
* no registers at all.
*/
if (list_empty(&map->debugfs_off_cache)) {
WARN_ON(list_empty(&map->debugfs_off_cache));
return base;
}
/* Find the relevant block */
list_for_each_entry(c, &map->debugfs_off_cache, list) {
if (*pos >= c->min && *pos <= c->max) {
if (from >= c->min && from <= c->max) {
*pos = c->min;
return c->base_reg;
}
ret = c->max;
*pos = c->min;
ret = c->base_reg;
}
return ret;
@ -387,16 +422,8 @@ void regmap_debugfs_init(struct regmap *map, const char *name)
void regmap_debugfs_exit(struct regmap *map)
{
struct regmap_debugfs_off_cache *c;
debugfs_remove_recursive(map->debugfs);
while (!list_empty(&map->debugfs_off_cache)) {
c = list_first_entry(&map->debugfs_off_cache,
struct regmap_debugfs_off_cache,
list);
list_del(&c->list);
kfree(c);
}
regmap_debugfs_free_dump_cache(map);
kfree(map->debugfs_name);
}