linux-kernel - [PATCH 2/7] drivers/hwmon: add local variable for newly allocated attribute

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Message-Id: <20231009165741.746184-2-max.kellermann@ionos.com>
Date:   Mon,  9 Oct 2023 18:57:35 +0200
From:   Max Kellermann <max.kellermann@...os.com>
To:     Jean Delvare <jdelvare@...e.com>,
        Guenter Roeck <linux@...ck-us.net>
Cc:     Max Kellermann <max.kellermann@...os.com>,
        linux-hwmon@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 2/7] drivers/hwmon: add local variable for newly allocated attribute_group**

This allows the compiler to keep the pointer in a register and
prepares for making the struct field "const".

Signed-off-by: Max Kellermann <max.kellermann@...os.com>
---
 drivers/hwmon/hwmon.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/drivers/hwmon/hwmon.c b/drivers/hwmon/hwmon.c
index c7dd3f5b2bd5..e50ab229b27d 100644
--- a/drivers/hwmon/hwmon.c
+++ b/drivers/hwmon/hwmon.c
@@ -783,6 +783,7 @@ __hwmon_device_register(struct device *dev, const char *name, void *drvdata,
 	hdev = &hwdev->dev;
 
 	if (chip) {
+		const struct attribute_group **new_groups;
 		struct attribute **attrs;
 		int ngroups = 2; /* terminating NULL plus &hwdev->groups */
 
@@ -790,8 +791,8 @@ __hwmon_device_register(struct device *dev, const char *name, void *drvdata,
 			for (i = 0; groups[i]; i++)
 				ngroups++;
 
-		hwdev->groups = kcalloc(ngroups, sizeof(*groups), GFP_KERNEL);
-		if (!hwdev->groups) {
+		hwdev->groups = new_groups = kcalloc(ngroups, sizeof(*new_groups), GFP_KERNEL);
+		if (!new_groups) {
 			err = -ENOMEM;
 			goto free_hwmon;
 		}
@@ -804,14 +805,14 @@ __hwmon_device_register(struct device *dev, const char *name, void *drvdata,
 
 		hwdev->group.attrs = attrs;
 		ngroups = 0;
-		hwdev->groups[ngroups++] = &hwdev->group;
+		new_groups[ngroups++] = &hwdev->group;
 
 		if (groups) {
 			for (i = 0; groups[i]; i++)
-				hwdev->groups[ngroups++] = groups[i];
+				new_groups[ngroups++] = groups[i];
 		}
 
-		hdev->groups = hwdev->groups;
+		hdev->groups = new_groups;
 	} else {
 		hdev->groups = groups;
 	}
-- 
2.39.2