linux-kernel - [PATCH 1/4] power: supply: ds2760: constify 'struct bin

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Message-Id: <20241202-sysfs-const-bin_attr-psy-v1-1-f846430b8b66@weissschuh.net>
Date: Mon, 02 Dec 2024 20:02:19 +0100
From: Thomas Weißschuh <linux@...ssschuh.net>
To: Sebastian Reichel <sre@...nel.org>
Cc: linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Thomas Weißschuh <linux@...ssschuh.net>
Subject: [PATCH 1/4] power: supply: ds2760: constify 'struct bin_attribute'

The sysfs core now allows instances of 'struct bin_attribute' to be
moved into read-only memory. Make use of that to protect them against
accidental or malicious modifications.

Signed-off-by: Thomas Weißschuh <linux@...ssschuh.net>
---
 drivers/power/supply/ds2760_battery.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/power/supply/ds2760_battery.c b/drivers/power/supply/ds2760_battery.c
index 7cf4ea06b5003427ac9719043c9a5a4361cb5341..83bdec5a2bda901460e0a8618949baa7ecc11e46 100644
--- a/drivers/power/supply/ds2760_battery.c
+++ b/drivers/power/supply/ds2760_battery.c
@@ -195,22 +195,22 @@ static int w1_ds2760_recall_eeprom(struct device *dev, int addr)
 }
 
 static ssize_t w1_slave_read(struct file *filp, struct kobject *kobj,
-			     struct bin_attribute *bin_attr, char *buf,
+			     const struct bin_attribute *bin_attr, char *buf,
 			     loff_t off, size_t count)
 {
 	struct device *dev = kobj_to_dev(kobj);
 	return w1_ds2760_read(dev, buf, off, count);
 }
 
-static BIN_ATTR_RO(w1_slave, DS2760_DATA_SIZE);
+static const BIN_ATTR_RO(w1_slave, DS2760_DATA_SIZE);
 
-static struct bin_attribute *w1_ds2760_bin_attrs[] = {
+static const struct bin_attribute *const w1_ds2760_bin_attrs[] = {
 	&bin_attr_w1_slave,
 	NULL,
 };
 
 static const struct attribute_group w1_ds2760_group = {
-	.bin_attrs = w1_ds2760_bin_attrs,
+	.bin_attrs_new = w1_ds2760_bin_attrs,
 };
 
 static const struct attribute_group *w1_ds2760_groups[] = {

-- 
2.47.1