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regmap: debugfs: Don't bother actually printing when calculating max length

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commit 176fc2d5770a0990eebff903ba680d2edd32e718 upstream.

The in kernel snprintf() will conveniently return the actual length of
the printed string even if not given an output beffer at all so just do
that rather than relying on the user to pass in a suitable buffer,
ensuring that we don't need to worry if the buffer was truncated due to
the size of the buffer passed in.

Reported-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Zefan Li <lizefan@huawei.com>
This commit is contained in:
Mark Brown 2015-09-19 07:12:34 -07:00 committed by Zefan Li
parent f4524d728f
commit 42bffe1abd
1 changed files with 1 additions and 2 deletions
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3
drivers/base/regmap/regmap-debugfs.c
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@ -23,8 +23,7 @@ static struct dentry *regmap_debugfs_root;
/* Calculate the length of a fixed format */ /* Calculate the length of a fixed format */
static size_t regmap_calc_reg_len(int max_val, char *buf, size_t buf_size) static size_t regmap_calc_reg_len(int max_val, char *buf, size_t buf_size)
{ {
snprintf(buf, buf_size, "%x", max_val); return snprintf(NULL, 0, "%x", max_val);
return strlen(buf);
} }
static ssize_t regmap_name_read_file(struct file *file, static ssize_t regmap_name_read_file(struct file *file,