linux-kernel - [PATCH] accel/habanalabs: constify 'struct bin

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Message-Id: <20241216-sysfs-const-bin_attr-habanalabs-v1-1-b35463197efb@weissschuh.net>
Date: Mon, 16 Dec 2024 13:25:12 +0100
From: Thomas Weißschuh <linux@...ssschuh.net>
To: Ofir Bitton <obitton@...ana.ai>, Oded Gabbay <ogabbay@...nel.org>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
 Thomas Weißschuh <linux@...ssschuh.net>
Subject: [PATCH] accel/habanalabs: 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/accel/habanalabs/common/sysfs.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/accel/habanalabs/common/sysfs.c b/drivers/accel/habanalabs/common/sysfs.c
index e9f8ccc0bbf9d4dabec1b51072d07170c51ffc9e..9d58efa2ff380c8773bd79bea613dc79a5a98020 100644
--- a/drivers/accel/habanalabs/common/sysfs.c
+++ b/drivers/accel/habanalabs/common/sysfs.c
@@ -368,7 +368,7 @@ static ssize_t max_power_store(struct device *dev,
 }
 
 static ssize_t eeprom_read_handler(struct file *filp, struct kobject *kobj,
-			struct bin_attribute *attr, char *buf, loff_t offset,
+			const struct bin_attribute *attr, char *buf, loff_t offset,
 			size_t max_size)
 {
 	struct device *dev = kobj_to_dev(kobj);
@@ -443,10 +443,10 @@ static DEVICE_ATTR_RO(security_enabled);
 static DEVICE_ATTR_RO(module_id);
 static DEVICE_ATTR_RO(parent_device);
 
-static struct bin_attribute bin_attr_eeprom = {
+static const struct bin_attribute bin_attr_eeprom = {
 	.attr = {.name = "eeprom", .mode = (0444)},
 	.size = PAGE_SIZE,
-	.read = eeprom_read_handler
+	.read_new = eeprom_read_handler
 };
 
 static struct attribute *hl_dev_attrs[] = {
@@ -472,14 +472,14 @@ static struct attribute *hl_dev_attrs[] = {
 	NULL,
 };
 
-static struct bin_attribute *hl_dev_bin_attrs[] = {
+static const struct bin_attribute *const hl_dev_bin_attrs[] = {
 	&bin_attr_eeprom,
 	NULL
 };
 
 static struct attribute_group hl_dev_attr_group = {
 	.attrs = hl_dev_attrs,
-	.bin_attrs = hl_dev_bin_attrs,
+	.bin_attrs_new = hl_dev_bin_attrs,
 };
 
 static struct attribute_group hl_dev_clks_attr_group;

---
base-commit: 78d4f34e2115b517bcbfe7ec0d018bbbb6f9b0b8
change-id: 20241216-sysfs-const-bin_attr-habanalabs-8c95e852dd8a

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