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.TH "USB_CLEAR_HALT" "9" "17 July 2003" "" ""

.SH NAME
usb_clear_halt \- tells device to clear endpoint halt/stall condition
.SH SYNOPSIS
.sp
\fB
.sp
int usb_clear_halt  (struct usb_device * \fIdev\fB, int \fIpipe\fB);
\fR
.SH "ARGUMENTS"
.TP
\fB\fIdev\fB\fR
device whose endpoint is halted
.TP
\fB\fIpipe\fB\fR
endpoint ``pipe'' being cleared
.SH "CONTEXT"
.PP
!in_interrupt ()
.SH "DESCRIPTION"
.PP
This is used to clear halt conditions for bulk and interrupt endpoints,
as reported by URB completion status.  Endpoints that are halted are
sometimes referred to as being ``stalled''.  Such endpoints are unable
to transmit or receive data until the halt status is cleared.  Any URBs
queued for such an endpoint should normally be unlinked by the driver
before clearing the halt condition, as described in sections 5.7.5
and 5.8.5 of the USB 2.0 spec.
.PP
Note that control and isochronous endpoints don't halt, although control
endpoints report ``protocol stall'' (for unsupported requests) using the
same status code used to report a true stall.
.PP
This call is synchronous, and may not be used in an interrupt context.
.PP
Returns zero on success, or else the status code returned by the
underlying \fBusb_control_msg\fR call.
.SH "ABOUT THIS DOCUMENT"
.PP
This documentation is free software; you can redistribute
it and/or modify it under the terms of the GNU General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later
version.
.PP
This program is distributed in the hope that it will be
useful, but WITHOUT ANY WARRANTY; without even the implied
warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU General Public License for more details.
.PP
You should have received a copy of the GNU General Public
License along with this program; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston,
MA 02111-1307 USA
.PP
For more details see the file COPYING in the source
distribution of Linux.
.PP
If you have comments on the formatting of this manpage, then please contact
Michael Still (mikal@stillhq.com).
.PP
This documentation was generated with kernel version 2.5.71.