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regulator: core: Fix size limit of supply_map

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Now the debugfs file supply_map has a size limit PAGE_SIZE and the user
can not see the whole content of regulator_map_list when it is larger
than this limit.

This patch uses seq_file instead to make sure supply_map shows the full
information of regulator_map_list.

Signed-off-by: Haishan Zhou <zhssmail@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Haishan Zhou 2017-06-30 11:43:42 +08:00 committed by Mark Brown
parent 062171973e
commit dbc5595540
1 changed files with 13 additions and 23 deletions
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36
drivers/regulator/core.c
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@ -4311,41 +4311,31 @@ void *regulator_get_init_drvdata(struct regulator_init_data *reg_init_data)
EXPORT_SYMBOL_GPL(regulator_get_init_drvdata);
#ifdef CONFIG_DEBUG_FS
static ssize_t supply_map_read_file(struct file *file, char __user *user_buf,
size_t count, loff_t *ppos)
static int supply_map_show(struct seq_file *sf, void *data)
{
char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
ssize_t len, ret = 0;
struct regulator_map *map;
if (!buf)
return -ENOMEM;
list_for_each_entry(map, &regulator_map_list, list) {
len = snprintf(buf + ret, PAGE_SIZE - ret,
"%s -> %s.%s\n",
rdev_get_name(map->regulator), map->dev_name,
map->supply);
if (len >= 0)
ret += len;
if (ret > PAGE_SIZE) {
ret = PAGE_SIZE;
break;
}
seq_printf(sf, "%s -> %s.%s\n",
rdev_get_name(map->regulator), map->dev_name,
map->supply);
}
ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
return 0;
}
kfree(buf);
return ret;
static int supply_map_open(struct inode *inode, struct file *file)
{
return single_open(file, supply_map_show, inode->i_private);
}
#endif
static const struct file_operations supply_map_fops = {
#ifdef CONFIG_DEBUG_FS
.read = supply_map_read_file,
.llseek = default_llseek,
.open = supply_map_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
#endif
};