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Commit dbc55955 authored by Haishan Zhou's avatar Haishan Zhou Committed by Mark Brown
Browse files

regulator: core: Fix size limit of supply_map 



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: default avatarHaishan Zhou <zhssmail@gmail.com>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 06217197

drivers/regulator/core.c

+13 −23
Original line number Diff line number Diff line
@@ -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",

		seq_printf(sf, "%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;

	}

	}



	ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);



	kfree(buf);

	return 0;

}



	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

};