<?xml version="1.0" encoding="ANSI_X3.4-1968" standalone="no"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968" /><title>usb_ep_alloc_request</title><meta name="generator" content="DocBook XSL Stylesheets V1.75.2" /><link rel="home" href="index.html" title="USB Gadget API for Linux" /><link rel="up" href="ch03s03.html" title="Core Objects and Methods" /><link rel="prev" href="re19.html" title="usb_ep_disable" /><link rel="next" href="re21.html" title="usb_ep_free_request" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span>usb_ep_alloc_request</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="re19.html">Prev</a> </td><th width="60%" align="center">Core Objects and Methods</th><td width="20%" align="right"> <a accesskey="n" href="re21.html">Next</a></td></tr></table><hr /></div><div class="refentry" title="usb_ep_alloc_request"><a id="API-usb-ep-alloc-request"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>usb_ep_alloc_request —
allocate a request object to use with this endpoint
</p></div><div class="refsynopsisdiv" title="Synopsis"><h2>Synopsis</h2><div class="funcsynopsis"><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0" class="funcprototype-table"><tr><td><code class="funcdef">struct usb_request * <b class="fsfunc">usb_ep_alloc_request </b>(</code></td><td>struct usb_ep * <var class="pdparam">ep</var>, </td></tr><tr><td> </td><td>gfp_t <var class="pdparam">gfp_flags</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1" title="Arguments"><a id="id2939700"></a><h2>Arguments</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>ep</code></em></span></dt><dd><p>
the endpoint to be used with with the request
</p></dd><dt><span class="term"><em class="parameter"><code>gfp_flags</code></em></span></dt><dd><p>
GFP_* flags to use
</p></dd></dl></div></div><div class="refsect1" title="Description"><a id="id2939743"></a><h2>Description</h2><p>
Request objects must be allocated with this call, since they normally
need controller-specific setup and may even need endpoint-specific
resources such as allocation of DMA descriptors.
Requests may be submitted with <code class="function">usb_ep_queue</code>, and receive a single
completion callback. Free requests with <code class="function">usb_ep_free_request</code>, when
they are no longer needed.
</p><p>
Returns the request, or null if one could not be allocated.
</p></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="re19.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="ch03s03.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="re21.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><span>usb_ep_disable</span> </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> <span>usb_ep_free_request</span></td></tr></table></div></body></html>
