usb_alloc_urb

Langue: en

Autres versions - même langue

Version: June 2009 (debian - 07/07/09)

Section: 9 (Appels noyau Linux)

Sommaire

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.