usb_deregister_dev(9) [centos man page]

USB_DEREGISTER_DEV(9)						   USB Core APIs					     USB_DEREGISTER_DEV(9)

NAME

       usb_deregister_dev - deregister a USB device's dynamic minor.

SYNOPSIS

       void usb_deregister_dev(struct usb_interface * intf, struct usb_class_driver * class_driver);

ARGUMENTS

       intf
	   pointer to the usb_interface that is being deregistered

       class_driver
	   pointer to the usb_class_driver for this device

DESCRIPTION

       Used in conjunction with usb_register_dev. This function is called when the USB driver is finished with the minor numbers gotten from a
       call to usb_register_dev (usually when the device is disconnected from the system.)

       This function also removes the usb class device from the sysfs tree.

       This should be called by all drivers that use the USB major number.

COPYRIGHT

Kernel Hackers Manual 3.10					     June 2014						     USB_DEREGISTER_DEV(9)

USB_QUEUE_RESET_DEVI(9) 					   USB Core APIs					   USB_QUEUE_RESET_DEVI(9)

NAME

       usb_queue_reset_device - Reset a USB device from an atomic context

SYNOPSIS

       void usb_queue_reset_device(struct usb_interface * iface);

ARGUMENTS

       iface
	   USB interface belonging to the device to reset

DESCRIPTION

       This function can be used to reset a USB device from an atomic context, where usb_reset_device won't work (as it blocks).

       Doing a reset via this method is functionally equivalent to calling usb_reset_device, except for the fact that it is delayed to a
       workqueue. This means that any drivers bound to other interfaces might be unbound, as well as users from usbfs in user space.

CORNER CASES

       - Scheduling two resets at the same time from two different drivers attached to two different interfaces of the same device is possible;
       depending on how the driver attached to each interface handles ->pre_reset, the second reset might happen or not.

       - If a driver is unbound and it had a pending reset, the reset will be cancelled.

       - This function can be called during .probe or .disconnect times. On return from .disconnect, any pending resets will be cancelled.

       There is no no need to lock/unlock the reset_ws as schedule_work does its own.

NOTE

       We don't do any reference count tracking because it is not needed. The lifecycle of the work_struct is tied to the usb_interface. Before
       destroying the interface we cancel the work_struct, so the fact that work_struct is queued and or running means the interface (and thus,
       the device) exist and are referenced.

COPYRIGHT

Kernel Hackers Manual 3.10					     June 2014						   USB_QUEUE_RESET_DEVI(9)