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USB: remove CONFIG_USB_DEVICE_CLASS

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This option has been deprecated for many years now, and no userspace
tools use it anymore, so it should be safe to finally remove it.

Reported-by: Kay Sievers <kay@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Greg Kroah-Hartman 2012-04-25 15:26:54 -07:00
parent fb28d58b72
commit 007bab9132
3 changed files with 0 additions and 75 deletions
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23
drivers/usb/core/Kconfig
View file

@ -27,29 +27,6 @@ config USB_ANNOUNCE_NEW_DEVICES
comment "Miscellaneous USB options"
depends on USB
config USB_DEVICE_CLASS
bool "USB device class-devices (DEPRECATED)"
depends on USB
default y
---help---
Userspace access to USB devices is granted by device-nodes exported
directly from the usbdev in sysfs. Old versions of the driver
core and udev needed additional class devices to export device nodes.
These additional devices are difficult to handle in userspace, if
information about USB interfaces must be available. One device
contains the device node, the other device contains the interface
data. Both devices are at the same level in sysfs (siblings) and one
can't access the other. The device node created directly by the
usb device is the parent device of the interface and therefore
easily accessible from the interface event.
This option provides backward compatibility for libusb device
nodes (lsusb) when usbfs is not used, and the following udev rule
doesn't exist:
SUBSYSTEM=="usb", ACTION=="add", ENV{DEVTYPE}=="usb_device", \
NAME="bus/usb/$env{BUSNUM}/$env{DEVNUM}", MODE="0644"
config USB_DYNAMIC_MINORS
bool "Dynamic USB minor allocation"
depends on USB

49
drivers/usb/core/devio.c
View file

@ -2051,44 +2051,13 @@ static void usbdev_remove(struct usb_device *udev)
}
}
#ifdef CONFIG_USB_DEVICE_CLASS
static struct class *usb_classdev_class;
static int usb_classdev_add(struct usb_device *dev)
{
struct device *cldev;
cldev = device_create(usb_classdev_class, &dev->dev, dev->dev.devt,
NULL, "usbdev%d.%d", dev->bus->busnum,
dev->devnum);
if (IS_ERR(cldev))
return PTR_ERR(cldev);
dev->usb_classdev = cldev;
return 0;
}
static void usb_classdev_remove(struct usb_device *dev)
{
if (dev->usb_classdev)
device_unregister(dev->usb_classdev);
}
#else
#define usb_classdev_add(dev) 0
#define usb_classdev_remove(dev) do {} while (0)
#endif
static int usbdev_notify(struct notifier_block *self,
unsigned long action, void *dev)
{
switch (action) {
case USB_DEVICE_ADD:
if (usb_classdev_add(dev))
return NOTIFY_BAD;
break;
case USB_DEVICE_REMOVE:
usb_classdev_remove(dev);
usbdev_remove(dev);
break;
}
@ -2118,21 +2087,6 @@ int __init usb_devio_init(void)
USB_DEVICE_MAJOR);
goto error_cdev;
}
#ifdef CONFIG_USB_DEVICE_CLASS
usb_classdev_class = class_create(THIS_MODULE, "usb_device");
if (IS_ERR(usb_classdev_class)) {
printk(KERN_ERR "Unable to register usb_device class\n");
retval = PTR_ERR(usb_classdev_class);
cdev_del(&usb_device_cdev);
usb_classdev_class = NULL;
goto out;
}
/* devices of this class shadow the major:minor of their parent
* device, so clear ->dev_kobj to prevent adding duplicate entries
* to /sys/dev
*/
usb_classdev_class->dev_kobj = NULL;
#endif
usb_register_notify(&usbdev_nb);
out:
return retval;
@ -2145,9 +2099,6 @@ int __init usb_devio_init(void)
void usb_devio_cleanup(void)
{
usb_unregister_notify(&usbdev_nb);
#ifdef CONFIG_USB_DEVICE_CLASS
class_destroy(usb_classdev_class);
#endif
cdev_del(&usb_device_cdev);
unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
}

3
include/linux/usb.h
View file

@ -489,9 +489,6 @@ struct usb_device {
char *serial;
struct list_head filelist;
#ifdef CONFIG_USB_DEVICE_CLASS
struct device *usb_classdev;
#endif
int maxchild;
struct usb_device **children;