void * usb_ep_alloc_buffer (struct usb_ep * ep, unsigned len, dma_addr_t * dma, int gfp_flags);
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 usb_ep_free_buffer.
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.
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.
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.
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
For more details see the file COPYING in the source distribution of Linux.
If you have comments on the formatting of this manpage, then please contact Michael Still (mikal@stillhq.com).
This documentation was generated with kernel version 2.6.0.