'\" t
.\"     Title: usb_block_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_BLOCK_URB" "9" "April 2019" "Kernel Hackers Manual 4\&.9\&." "USB Core APIs"
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.SH "NAME"
usb_block_urb \- reliably prevent further use of an URB
.SH "SYNOPSIS"
.HP \w'void\ usb_block_urb('u
.BI "void usb_block_urb(struct\ urb\ *\ " "urb" ");"
.SH "ARGUMENTS"
.PP
\fIurb\fR
.RS 4
pointer to URB to be blocked, may be NULL
.RE
.SH "DESCRIPTION"
.PP
After the routine has run, attempts to resubmit the URB will fail with error \-EPERM\&. Thus even if the URB\*(Aqs completion handler always tries to resubmit, it will not succeed and the URB will become idle\&.
.PP
The URB must not be deallocated while this routine is running\&. In particular, when a driver calls this routine, it must insure that the completion handler cannot deallocate the URB\&.
.SH "COPYRIGHT"
.br