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.TH "USB_EP_ALLOC_BUFFER" "9" "17 July 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
Permission is granted to copy, distribute, and/or modify
this document under the terms of the GNU Free Documentation
License, version 1.2, or any later version published by the
Free Software Foundation; with the Invariant Sections being
the "GNU Free Documentation License",
no Front-Cover Texts,
and
no Back-Cover Texts.
.PP
This documentation 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 Free Documentation License for more details.
.PP
Note that certain sections of this document are merged
into Linux kernel source code.
That content is the bulk of 
[XRef to CORE]> and
[XRef to UTILS]>,
where the "GNU Free Documentation License" is identified
as an alternate licence for its documentation.
.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 2.5.73.