usb_alloc_urb (9) - Linux Manuals
usb_alloc_urb: creates a new urb for a USB driver to use
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.
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