sysfs: sysfs_chmod_file's attr can be const

sysfs_chmod_file doesn't change the attribute it operates on, so this
attribute can be marked const.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

fs/sysfs/file.c

@@ -593,7 +593,8 @@ EXPORT_SYMBOL_GPL(sysfs_add_file_to_group);
  * @mode: file permissions.
  *
  */
-int sysfs_chmod_file(struct kobject *kobj, struct attribute *attr, mode_t mode)
+int sysfs_chmod_file(struct kobject *kobj, const struct attribute *attr,
+		     mode_t mode)
 {
 	struct sysfs_dirent *sd;
 	struct iattr newattrs;

include/linux/sysfs.h

@@ -136,8 +136,8 @@ int __must_check sysfs_create_file(struct kobject *kobj,
 				   const struct attribute *attr);
 int __must_check sysfs_create_files(struct kobject *kobj,
 				   const struct attribute **attr);
-int __must_check sysfs_chmod_file(struct kobject *kobj, struct attribute *attr,
-				  mode_t mode);
+int __must_check sysfs_chmod_file(struct kobject *kobj,
+				  const struct attribute *attr, mode_t mode);
 void sysfs_remove_file(struct kobject *kobj, const struct attribute *attr);
 void sysfs_remove_files(struct kobject *kobj, const struct attribute **attr);
 
@@ -225,7 +225,7 @@ static inline int sysfs_create_files(struct kobject *kobj,
 }
 
 static inline int sysfs_chmod_file(struct kobject *kobj,
-				   struct attribute *attr, mode_t mode)
+				   const struct attribute *attr, mode_t mode)
 {
 	return 0;
 }