centos man page for usb_init_urb

USB_INIT_URB(9) 						   USB Core APIs						   USB_INIT_URB(9)

NAME
       usb_init_urb - initializes a urb so that it can be used by a USB driver

SYNOPSIS
       void usb_init_urb(struct urb * urb);

ARGUMENTS
       urb
	   pointer to the urb to initialize

DESCRIPTION
       Initializes a urb so that the USB subsystem can use it properly.

       If a urb is created with a call to usb_alloc_urb it is not necessary to call this function. Only use this if you allocate the space for a
       struct urb on your own. If you call this function, be careful when freeing the memory for your urb that it is no longer in use by the USB
       core.

       Only use this function if you _really_ understand what you are doing.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014							   USB_INIT_URB(9)