leds: lp55xx: fix the sysfs read operation

According to a sysfs documentation(Documentation/filesystem/sysfs.txt),
scnprintf() should be used in a read operation method.
It guarantees safe buffer size(PAGE_SIZE) which is allocated by the sysfs.

Signed-off-by: Milo(Woogyom) Kim <milo.kim@ti.com>
Signed-off-by: Bryan Wu <cooloney@gmail.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/leds/leds-lp5521.c b/drivers/leds/leds-lp5521.c
index 1001347ba70b..7f10304219ea 100644
--- a/drivers/leds/leds-lp5521.c
+++ b/drivers/leds/leds-lp5521.c
@@ -360,7 +360,8 @@ static ssize_t lp5521_selftest(struct device *dev,
         mutex_lock(&chip->lock);
         ret = lp5521_run_selftest(chip, buf);
         mutex_unlock(&chip->lock);
-        return sprintf(buf, "%s\n", ret ? "FAIL" : "OK");
+
+        return scnprintf(buf, PAGE_SIZE, "%s\n", ret ? "FAIL" : "OK");
 }
 
 /* device attributes */