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>
diff --git a/drivers/leds/leds-lp5521.c b/drivers/leds/leds-lp5521.c
index 1001347..7f10304 100644
--- a/drivers/leds/leds-lp5521.c
+++ b/drivers/leds/leds-lp5521.c
@@ -360,7 +360,8 @@
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 */