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driver core: class: make class_register() take a const *

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Now that the class code is cleaned up to not modify the class pointer
registered with it, change class_register() to take a const * to allow
the structure to be placed into read-only memory.

Acked-by: Rafael J. Wysocki <rafael@kernel.org>
Link: https://lore.kernel.org/r/2023040248-customary-release-4aec@gregkh
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Greg Kroah-Hartman 2023-04-02 19:58:47 +02:00
parent 979207cac5
commit 43a7206b09
3 changed files with 5 additions and 5 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

2
drivers/base/base.h
View file

@ -54,7 +54,7 @@ struct subsys_private {
struct device *dev_root; struct device *dev_root;
struct kset glue_dirs; struct kset glue_dirs;
struct class *class; const struct class *class;
struct lock_class_key lock_key; struct lock_class_key lock_key;
}; };

6
drivers/base/class.c
View file

@ -93,7 +93,7 @@ static ssize_t class_attr_store(struct kobject *kobj, struct attribute *attr,
static void class_release(struct kobject *kobj) static void class_release(struct kobject *kobj)
{ {
struct subsys_private *cp = to_subsys_private(kobj); struct subsys_private *cp = to_subsys_private(kobj);
struct class *class = cp->class; const struct class *class = cp->class;
pr_debug("class '%s': release.\n", class->name); pr_debug("class '%s': release.\n", class->name);
@ -110,7 +110,7 @@ static void class_release(struct kobject *kobj)
static const struct kobj_ns_type_operations *class_child_ns_type(const struct kobject *kobj) static const struct kobj_ns_type_operations *class_child_ns_type(const struct kobject *kobj)
{ {
const struct subsys_private *cp = to_subsys_private(kobj); const struct subsys_private *cp = to_subsys_private(kobj);
struct class *class = cp->class; const struct class *class = cp->class;
return class->ns_type; return class->ns_type;
} }
@ -175,7 +175,7 @@ static void klist_class_dev_put(struct klist_node *n)
put_device(dev); put_device(dev);
} }
int class_register(struct class *cls) int class_register(const struct class *cls)
{ {
struct subsys_private *cp; struct subsys_private *cp;
struct lock_class_key *key; struct lock_class_key *key;

2
include/linux/device/class.h
View file

@ -76,7 +76,7 @@ struct class_dev_iter {
const struct device_type *type; const struct device_type *type;
}; };
int __must_check class_register(struct class *class); int __must_check class_register(const struct class *class);
void class_unregister(const struct class *class); void class_unregister(const struct class *class);
bool class_is_registered(const struct class *class); bool class_is_registered(const struct class *class);