linux-kernel - [PATCH 04/12] w1: ds2413: Constify 'struct bin

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Message-Id: <20241211-sysfs-const-bin_attr-w1-v1-4-c4befd2aa7cc@weissschuh.net>
Date: Wed, 11 Dec 2024 18:50:19 +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 04/12] w1: ds2413: 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_ds2413.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/w1/slaves/w1_ds2413.c b/drivers/w1/slaves/w1_ds2413.c
index 7390098064679e2f751814bd5bcd7fa3f362808d..5fa46017ca7cd8ae8ff657adaa9ed0e83f5d0e8b 100644
--- a/drivers/w1/slaves/w1_ds2413.c
+++ b/drivers/w1/slaves/w1_ds2413.c
@@ -25,8 +25,8 @@
 #define W1_F3A_INVALID_PIO_STATE           0xFF
 
 static ssize_t state_read(struct file *filp, struct kobject *kobj,
-			  struct bin_attribute *bin_attr, char *buf, loff_t off,
-			  size_t count)
+			  const struct bin_attribute *bin_attr, char *buf,
+			  loff_t off, size_t count)
 {
 	struct w1_slave *sl = kobj_to_w1_slave(kobj);
 	unsigned int retries = W1_F3A_RETRIES;
@@ -78,10 +78,10 @@ static ssize_t state_read(struct file *filp, struct kobject *kobj,
 	return bytes_read;
 }
 
-static BIN_ATTR_RO(state, 1);
+static const BIN_ATTR_RO(state, 1);
 
 static ssize_t output_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);
@@ -128,16 +128,16 @@ static ssize_t output_write(struct file *filp, struct kobject *kobj,
 	return bytes_written;
 }
 
-static BIN_ATTR(output, 0664, NULL, output_write, 1);
+static const BIN_ATTR(output, 0664, NULL, output_write, 1);
 
-static struct bin_attribute *w1_f3a_bin_attrs[] = {
+static const struct bin_attribute *const w1_f3a_bin_attrs[] = {
 	&bin_attr_state,
 	&bin_attr_output,
 	NULL,
 };
 
 static const struct attribute_group w1_f3a_group = {
-	.bin_attrs = w1_f3a_bin_attrs,
+	.bin_attrs_new = w1_f3a_bin_attrs,
 };
 
 static const struct attribute_group *w1_f3a_groups[] = {

-- 
2.47.1