suse man page for usb_alloc_urb

USB_ALLOC_URB(9)						   USB Core APIs						  USB_ALLOC_URB(9)

NAME
       usb_alloc_urb - creates a new urb for a USB driver to use

SYNOPSIS
       struct urb * usb_alloc_urb(int iso_packets, gfp_t mem_flags);

ARGUMENTS
       iso_packets
	   number of iso packets for this urb

       mem_flags
	   the type of memory to allocate, see kmalloc for a list of valid options for this.

DESCRIPTION
       Creates an urb for the USB driver to use, initializes a few internal structures, incrementes the usage counter, and returns a pointer to
       it.

       If no memory is available, NULL is returned.

       If the driver want to use this urb for interrupt, control, or bulk endpoints, pass '0' as the number of iso packets.

       The driver must call usb_free_urb when it is finished with the urb.

COPYRIGHT
Kernel Hackers Manual 2.6.					     July 2010							  USB_ALLOC_URB(9)