linux-kernel - [PATCH] i2c: slave-eeprom: Constify 'struct bin

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Message-Id: <20241215-sysfs-const-bin_attr-i2c-v1-1-d5c336c02924@weissschuh.net>
Date: Sun, 15 Dec 2024 14:21:39 +0100
From: Thomas Weißschuh <linux@...ssschuh.net>
To: Wolfram Sang <wsa+renesas@...g-engineering.com>
Cc: linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Thomas Weißschuh <linux@...ssschuh.net>
Subject: [PATCH] i2c: slave-eeprom: 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/i2c/i2c-slave-eeprom.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/i2c/i2c-slave-eeprom.c b/drivers/i2c/i2c-slave-eeprom.c
index 5946c0d0aef991aaa280a2df1d74d8a2ef09120f..275d1d0e910fbec72c4795cb3aafa714c52fcd94 100644
--- a/drivers/i2c/i2c-slave-eeprom.c
+++ b/drivers/i2c/i2c-slave-eeprom.c
@@ -91,7 +91,7 @@ static int i2c_slave_eeprom_slave_cb(struct i2c_client *client,
 }
 
 static ssize_t i2c_slave_eeprom_bin_read(struct file *filp, struct kobject *kobj,
-		struct bin_attribute *attr, char *buf, loff_t off, size_t count)
+		const struct bin_attribute *attr, char *buf, loff_t off, size_t count)
 {
 	struct eeprom_data *eeprom;
 	unsigned long flags;
@@ -106,7 +106,7 @@ static ssize_t i2c_slave_eeprom_bin_read(struct file *filp, struct kobject *kobj
 }
 
 static ssize_t i2c_slave_eeprom_bin_write(struct file *filp, struct kobject *kobj,
-		struct bin_attribute *attr, char *buf, loff_t off, size_t count)
+		const struct bin_attribute *attr, char *buf, loff_t off, size_t count)
 {
 	struct eeprom_data *eeprom;
 	unsigned long flags;
@@ -165,8 +165,8 @@ static int i2c_slave_eeprom_probe(struct i2c_client *client)
 	sysfs_bin_attr_init(&eeprom->bin);
 	eeprom->bin.attr.name = "slave-eeprom";
 	eeprom->bin.attr.mode = S_IRUSR | S_IWUSR;
-	eeprom->bin.read = i2c_slave_eeprom_bin_read;
-	eeprom->bin.write = i2c_slave_eeprom_bin_write;
+	eeprom->bin.read_new = i2c_slave_eeprom_bin_read;
+	eeprom->bin.write_new = i2c_slave_eeprom_bin_write;
 	eeprom->bin.size = size;
 
 	ret = sysfs_create_bin_file(&client->dev.kobj, &eeprom->bin);

---
base-commit: 2d8308bf5b67dff50262d8a9260a50113b3628c6
change-id: 20241215-sysfs-const-bin_attr-i2c-5f1bbc48f590

Best regards,
-- 
Thomas Weißschuh <linux@...ssschuh.net>