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.TH "USB_EP_ALLOC_BUFFER" "9" "07 August 2003" "" ""
.SH NAME
usb_ep_alloc_buffer \- allocate an I/O buffer
.SH SYNOPSIS
.sp
\fB
.sp
void * usb_ep_alloc_buffer  (struct usb_ep * \fIep\fB, unsigned \fIlen\fB, dma_addr_t * \fIdma\fB, int \fIgfp_flags\fB);
\fR
.SH "ARGUMENTS"
.TP
\fB\fIep\fB\fR
the endpoint associated with the buffer
.TP
\fB\fIlen\fB\fR
length of the desired buffer
.TP
\fB\fIdma\fB\fR
pointer to the buffer's DMA address; must be valid
.TP
\fB\fIgfp_flags\fB\fR
GFP_* flags to use
.SH "DESCRIPTION"
.PP
Returns a new buffer, or null if one could not be allocated.
The buffer is suitably aligned for dma, if that endpoint uses DMA,
and the caller won't have to care about dma-inconsistency
or any hidden ``bounce buffer'' mechanism.  No additional per-request
DMA mapping will be required for such buffers.
Free it later with \fBusb_ep_free_buffer\fR.
.PP
You don't need to use this call to allocate I/O buffers unless you
want to make sure drivers don't incur costs for such ``bounce buffer''
copies or per-request DMA mappings.
.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 2.6.0.