From b2a4cc3a060da0de17ab1e854cef89f5e74e2064 Mon Sep 17 00:00:00 2001
From: Guenter Roeck <linux@roeck-us.net>
Date: Sun, 16 Oct 2016 17:11:52 -0700
Subject: [PATCH] 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>
---
 drivers/hwmon/hwmon.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/hwmon/hwmon.c b/drivers/hwmon/hwmon.c
index a0b5becf91fa5..8dc0466a93072 100644
--- 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++)