Provided by: linux-doc-2.6.15_2.6.15-23.39_all bug

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.