w1: ds2438: 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@weissschuh.net>
Link: https://lore.kernel.org/r/20241211-sysfs-const-bin_attr-w1-v1-8-c4befd2aa7cc@weissschuh.net
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>

diff --git a/drivers/w1/slaves/w1_ds2438.c b/drivers/w1/slaves/w1_ds2438.c
index e008c27b3db9efaaba4e6965cc7c3ff032afe3cc..630a6db5045e8c2985cae6fef684bb6f2081f95d 100644 (file)
--- a/drivers/w1/slaves/w1_ds2438.c
+++ b/drivers/w1/slaves/w1_ds2438.c
@@ -288,7 +288,7 @@ static int w1_ds2438_get_current(struct w1_slave *sl, int16_t *voltage)
 }
 
 static ssize_t iad_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);
@@ -310,7 +310,7 @@ static ssize_t iad_write(struct file *filp, struct kobject *kobj,
 }
 
 static ssize_t iad_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);
@@ -331,7 +331,7 @@ static ssize_t iad_read(struct file *filp, struct kobject *kobj,
 }
 
 static ssize_t page0_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);
@@ -361,7 +361,7 @@ static ssize_t page0_read(struct file *filp, struct kobject *kobj,
 }
 
 static ssize_t page1_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);
@@ -391,7 +391,7 @@ static ssize_t page1_read(struct file *filp, struct kobject *kobj,
 }
 
 static ssize_t offset_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);
@@ -410,7 +410,7 @@ static ssize_t offset_write(struct file *filp, struct kobject *kobj,
 }
 
 static ssize_t temperature_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);
@@ -431,7 +431,7 @@ static ssize_t temperature_read(struct file *filp, struct kobject *kobj,
 }
 
 static ssize_t vad_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);
@@ -452,7 +452,7 @@ static ssize_t vad_read(struct file *filp, struct kobject *kobj,
 }
 
 static ssize_t vdd_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);
@@ -472,15 +472,15 @@ static ssize_t vdd_read(struct file *filp, struct kobject *kobj,
        return ret;
 }
 
-static BIN_ATTR_RW(iad, 0);
-static BIN_ATTR_RO(page0, DS2438_PAGE_SIZE);
-static BIN_ATTR_RO(page1, DS2438_PAGE_SIZE);
-static BIN_ATTR_WO(offset, 2);
-static BIN_ATTR_RO(temperature, 0/* real length varies */);
-static BIN_ATTR_RO(vad, 0/* real length varies */);
-static BIN_ATTR_RO(vdd, 0/* real length varies */);
+static const BIN_ATTR_RW(iad, 0);
+static const BIN_ATTR_RO(page0, DS2438_PAGE_SIZE);
+static const BIN_ATTR_RO(page1, DS2438_PAGE_SIZE);
+static const BIN_ATTR_WO(offset, 2);
+static const BIN_ATTR_RO(temperature, 0/* real length varies */);
+static const BIN_ATTR_RO(vad, 0/* real length varies */);
+static const BIN_ATTR_RO(vdd, 0/* real length varies */);
 
-static struct bin_attribute *w1_ds2438_bin_attrs[] = {
+static const struct bin_attribute *const w1_ds2438_bin_attrs[] = {
        &bin_attr_iad,
        &bin_attr_page0,
        &bin_attr_page1,
@@ -492,7 +492,7 @@ static struct bin_attribute *w1_ds2438_bin_attrs[] = {
 };
 
 static const struct attribute_group w1_ds2438_group = {
-       .bin_attrs = w1_ds2438_bin_attrs,
+       .bin_attrs_new = w1_ds2438_bin_attrs,
 };
 
 static const struct attribute_group *w1_ds2438_groups[] = {