linux-kernel - [PATCH 05/12] w1: ds2430: Constify 'struct bin

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Message-Id: <20241211-sysfs-const-bin_attr-w1-v1-5-c4befd2aa7cc@weissschuh.net>
Date: Wed, 11 Dec 2024 18:50:20 +0100
From: Thomas Weißschuh <linux@...ssschuh.net>
To: Krzysztof Kozlowski <krzk@...nel.org>
Cc: linux-kernel@...r.kernel.org, 
 Thomas Weißschuh <linux@...ssschuh.net>
Subject: [PATCH 05/12] w1: ds2430: 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/w1/slaves/w1_ds2430.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/w1/slaves/w1_ds2430.c b/drivers/w1/slaves/w1_ds2430.c
index 0ea7d779d17aecf8cbdd19320a6df6070ed9d507..ff56e2e68e583b3bb4df82c119e9325271342595 100644
--- a/drivers/w1/slaves/w1_ds2430.c
+++ b/drivers/w1/slaves/w1_ds2430.c
@@ -95,7 +95,7 @@ static int w1_f14_readblock(struct w1_slave *sl, int off, int count, char *buf)
 }
 
 static ssize_t eeprom_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 w1_slave *sl = kobj_to_w1_slave(kobj);
@@ -202,7 +202,7 @@ static int w1_f14_write(struct w1_slave *sl, int addr, int len, const u8 *data)
 }
 
 static ssize_t eeprom_write(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 w1_slave *sl = kobj_to_w1_slave(kobj);
@@ -263,15 +263,15 @@ static ssize_t eeprom_write(struct file *filp, struct kobject *kobj,
 	return count;
 }
 
-static BIN_ATTR_RW(eeprom, W1_F14_EEPROM_SIZE);
+static const BIN_ATTR_RW(eeprom, W1_F14_EEPROM_SIZE);
 
-static struct bin_attribute *w1_f14_bin_attrs[] = {
+static const struct bin_attribute *const w1_f14_bin_attrs[] = {
 	&bin_attr_eeprom,
 	NULL,
 };
 
 static const struct attribute_group w1_f14_group = {
-	.bin_attrs = w1_f14_bin_attrs,
+	.bin_attrs_new = w1_f14_bin_attrs,
 };
 
 static const struct attribute_group *w1_f14_groups[] = {

-- 
2.47.1