rtc: sysfs: Bail out earlier if no new groups provided

When there is no new groups provided, no need to reallocate memory,
copy the old ones and free them in order to do nothing. Do nothing
instead.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20250702073224.2684097-1-andriy.shevchenko@linux.intel.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

diff --git a/drivers/rtc/sysfs.c b/drivers/rtc/sysfs.c
index 86d1140b4f39dc81f31b42df45cf3739451b13fe..bf98a89d0e4e2585973b121e258ff9314f939b55 100644 (file)
--- a/drivers/rtc/sysfs.c
+++ b/drivers/rtc/sysfs.c
@@ -314,17 +314,21 @@ int rtc_add_groups(struct rtc_device *rtc, const struct attribute_group **grps)
        size_t old_cnt = 0, add_cnt = 0, new_cnt;
        const struct attribute_group **groups, **old;
 
-       if (!grps)
+       if (grps) {
+               for (groups = grps; *groups; groups++)
+                       add_cnt++;
+               /* No need to modify current groups if nothing new is provided */
+               if (add_cnt == 0)
+                       return 0;
+       } else {
                return -EINVAL;
+       }
 
        groups = rtc->dev.groups;
        if (groups)
                for (; *groups; groups++)
                        old_cnt++;
 
-       for (groups = grps; *groups; groups++)
-               add_cnt++;
-
        new_cnt = old_cnt + add_cnt + 1;
        groups = devm_kcalloc(&rtc->dev, new_cnt, sizeof(*groups), GFP_KERNEL);
        if (!groups)