regmap: debugfs: use snprintf return value in regmap_reg_ranges_read_file()

Calling strlen() no less than three times on entry is silly. Since
we're formatting into a buffer with plenty of room, there's no chance
of truncation, so snprintf() has actually returned the value we want,
meaning we don't even have to call strlen once.

Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 6 insertions, 5 deletions

diff --git a/drivers/base/regmap/regmap-debugfs.c b/drivers/base/regmap/regmap-debugfs.c
index 4a4737887cce..1ffc101ca011 100644
--- a/drivers/base/regmap/regmap-debugfs.c
+++ b/drivers/base/regmap/regmap-debugfs.c
@@ -337,6 +337,7 @@ static ssize_t regmap_reg_ranges_read_file(struct file *file,
         char *buf;
         char *entry;
         int ret;
+        unsigned entry_len;
 
         if (*ppos < 0 || !count)
                 return -EINVAL;
@@ -364,18 +365,18 @@ static ssize_t regmap_reg_ranges_read_file(struct file *file,
         p = 0;
         mutex_lock(&map->cache_lock);
         list_for_each_entry(c, &map->debugfs_off_cache, list) {
-                snprintf(entry, PAGE_SIZE, "%x-%x",
-                         c->base_reg, c->max_reg);
+                entry_len = snprintf(entry, PAGE_SIZE, "%x-%x",
+                                     c->base_reg, c->max_reg);
                 if (p >= *ppos) {
-                        if (buf_pos + 1 + strlen(entry) > count)
+                        if (buf_pos + 1 + entry_len > count)
                                 break;
                         snprintf(buf + buf_pos, count - buf_pos,
                                  "%s", entry);
-                        buf_pos += strlen(entry);
+                        buf_pos += entry_len;
                         buf[buf_pos] = '\n';
                         buf_pos++;
                 }
-                p += strlen(entry) + 1;
+                p += entry_len + 1;
         }
         mutex_unlock(&map->cache_lock);