hwmon: (core) Explain why at least two attribute groups are allocated

A list of sysfs attribute groups is NULL-terminated, so we always need
to allocate data for at least two groups (the dynamically generated group
plus the NULL pointer). Add a comment to explain the situation.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>

diff --git a/drivers/hwmon/hwmon.c b/drivers/hwmon/hwmon.c
index a0b5bec..8dc0466 100644 (file)
--- a/drivers/hwmon/hwmon.c
+++ b/drivers/hwmon/hwmon.c
@@ -561,7 +561,7 @@ __hwmon_device_register(struct device *dev, const char *name, void *drvdata,
 
        if (chip) {
                struct attribute **attrs;
-               int ngroups = 2;
+               int ngroups = 2; /* terminating NULL plus &hwdev->groups */
 
                if (groups)
                        for (i = 0; groups[i]; i++)