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,
       increments the usage counter, and returns a pointer to it.

       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.

RETURN
       A pointer to the new urb, or NULL if no memory is available.

COPYRIGHT
Kernel Hackers Manual 4.8.                 January 2017                          USB_ALLOC_URB(9)