firmware: google: gsmi: 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 <[email protected]>
Acked-by: Brian Norris <[email protected]>
Link: https://lore.kernel.org/r/20241215-sysfs-const-bin_attr-google-v1-2-e5c2808f5833@weissschuh.net
Signed-off-by: Tzung-Bi Shih <[email protected]>

Author: t-8ch

drivers/firmware/google/gsmi.c

@@ -488,7 +488,7 @@ static const struct efivar_operations efivar_ops = {
 #endif /* CONFIG_EFI */
 
 static ssize_t eventlog_write(struct file *filp, struct kobject *kobj,
-			       struct bin_attribute *bin_attr,
+			       const struct bin_attribute *bin_attr,
 			       char *buf, loff_t pos, size_t count)
 {
 	struct gsmi_set_eventlog_param param = {
@@ -528,9 +528,9 @@ static ssize_t eventlog_write(struct file *filp, struct kobject *kobj,
 
 }
 
-static struct bin_attribute eventlog_bin_attr = {
+static const struct bin_attribute eventlog_bin_attr = {
 	.attr = {.name = "append_to_eventlog", .mode = 0200},
-	.write = eventlog_write,
+	.write_new = eventlog_write,
 };
 
 static ssize_t gsmi_clear_eventlog_store(struct kobject *kobj,