Commit a5f81642 authored by Kerem Karabay's avatar Kerem Karabay Committed by Greg Kroah-Hartman
Browse files

USB: core: add 'shutdown' callback to usb_driver 



Currently there is no standardized method for USB drivers to handle
shutdown events. This patch simplifies running code on shutdown for USB
devices by adding a shutdown callback to usb_driver.

Signed-off-by: default avatarKerem Karabay <kekrby@gmail.com>
Signed-off-by: default avatarAditya Garg <gargaditya08@live.com>
Link: https://lore.kernel.org/r/7AAC1BF4-8B60-448D-A3C1-B7E80330BE42@live.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 41ea26a0

drivers/usb/core/driver.c

+14 −0
Original line number Diff line number Diff line
@@ -517,6 +517,19 @@ static int usb_unbind_interface(struct device *dev) 
	return 0;

}



static void usb_shutdown_interface(struct device *dev)

{

	struct usb_interface *intf = to_usb_interface(dev);

	struct usb_driver *driver;



	if (!dev->driver)

		return;



	driver = to_usb_driver(dev->driver);

	if (driver->shutdown)

		driver->shutdown(intf);

}



/**

 * usb_driver_claim_interface - bind a driver to an interface

 * @driver: the driver to be bound
@@ -1059,6 +1072,7 @@ int usb_register_driver(struct usb_driver *new_driver, struct module *owner, 
	new_driver->driver.bus = &usb_bus_type;

	new_driver->driver.probe = usb_probe_interface;

	new_driver->driver.remove = usb_unbind_interface;

	new_driver->driver.shutdown = usb_shutdown_interface;

	new_driver->driver.owner = owner;

	new_driver->driver.mod_name = mod_name;

	new_driver->driver.dev_groups = new_driver->dev_groups;

include/linux/usb.h

+3 −0
Original line number Diff line number Diff line
@@ -1171,6 +1171,7 @@ extern ssize_t usb_show_dynids(struct usb_dynids *dynids, char *buf); 
 *	post_reset method is called.

 * @post_reset: Called by usb_reset_device() after the device

 *	has been reset

 * @shutdown: Called at shut-down time to quiesce the device.

 * @id_table: USB drivers use ID table to support hotplugging.

 *	Export this with MODULE_DEVICE_TABLE(usb,...).  This must be set

 *	or your driver's probe function will never get called.
@@ -1222,6 +1223,8 @@ struct usb_driver { 
	int (*pre_reset)(struct usb_interface *intf);

	int (*post_reset)(struct usb_interface *intf);



	void (*shutdown)(struct usb_interface *intf);



	const struct usb_device_id *id_table;

	const struct attribute_group **dev_groups;