'\" t
.\"     Title: usb_alloc_urb
.\"    Author: [FIXME: author] [see http://docbook.sf.net/el/author]
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\"      Date: April 2019
.\"    Manual: USB Core APIs
.\"    Source: Kernel Hackers Manual 4.9.168
.\"  Language: English
.\"
.TH "USB_ALLOC_URB" "9" "April 2019" "Kernel Hackers Manual 4\&.9\&." "USB Core APIs"
.\" -----------------------------------------------------------------
.\" * Define some portability stuff
.\" -----------------------------------------------------------------
.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.\" http://bugs.debian.org/507673
.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.ie \n(.g .ds Aq \(aq
.el       .ds Aq '
.\" -----------------------------------------------------------------
.\" * set default formatting
.\" -----------------------------------------------------------------
.\" disable hyphenation
.nh
.\" disable justification (adjust text to left margin only)
.ad l
.\" -----------------------------------------------------------------
.\" * MAIN CONTENT STARTS HERE *
.\" -----------------------------------------------------------------
.SH "NAME"
usb_alloc_urb \- creates a new urb for a USB driver to use
.SH "SYNOPSIS"
.HP \w'struct\ urb\ *\ usb_alloc_urb('u
.BI "struct urb * usb_alloc_urb(int\ " "iso_packets" ", gfp_t\ " "mem_flags" ");"
.SH "ARGUMENTS"
.PP
\fIiso_packets\fR
.RS 4
number of iso packets for this urb
.RE
.PP
\fImem_flags\fR
.RS 4
the type of memory to allocate, see
\fBkmalloc\fR
for a list of valid options for this\&.
.RE
.SH "DESCRIPTION"
.PP
Creates an urb for the USB driver to use, initializes a few internal structures, increments the usage counter, and returns a pointer to it\&.
.PP
If the driver want to use this urb for interrupt, control, or bulk endpoints, pass \*(Aq0\*(Aq as the number of iso packets\&.
.PP
The driver must call
\fBusb_free_urb\fR
when it is finished with the urb\&.
.SH "RETURN"
.PP
A pointer to the new urb, or
\fBNULL\fR
if no memory is available\&.
.SH "COPYRIGHT"
.br