HID: core: remove #ifdef CONFIG_PM from hid_driver

Allow HID drivers to pass ->suspend, ->resume and ->reset_resume via
pm_ptr().
Through the usage of pm_ptr() the CONFIG_PM-dependent code will always be
compiled, protecting against bitrot.
The linker will then garbage-collect the unused function avoiding any overhead.

The only overhead in the final kernel image and at runtime are a few
extra bytes in 'struct hid_driver'.

The same approach is chosen by 'struct usb_driver' and other subsystems.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Link: https://lore.kernel.org/r/20231012-hid-pm_ptr-v1-1-0a71531ca93b@weissschuh.net
Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>

diff --git a/include/linux/hid.h b/include/linux/hid.h
index 964ca1f..5a8387a 100644 (file)
--- a/include/linux/hid.h
+++ b/include/linux/hid.h
@@ -833,11 +833,11 @@ struct hid_driver {
        void (*feature_mapping)(struct hid_device *hdev,
                        struct hid_field *field,
                        struct hid_usage *usage);
-#ifdef CONFIG_PM
+
        int (*suspend)(struct hid_device *hdev, pm_message_t message);
        int (*resume)(struct hid_device *hdev);
        int (*reset_resume)(struct hid_device *hdev);
-#endif
+
 /* private: */
        struct device_driver driver;
 };