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<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968" /><title>usb_free_urb</title><meta name="generator" content="DocBook XSL Stylesheets V1.75.2" /><link rel="home" href="index.html" title="The Linux-USB Host Side API" /><link rel="up" href="ch05.html" title="Chapter 5. USB Core APIs" /><link rel="prev" href="re42.html" title="usb_alloc_urb" /><link rel="next" href="re44.html" title="usb_get_urb" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span>usb_free_urb</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="re42.html">Prev</a> </td><th width="60%" align="center">Chapter 5. USB Core APIs</th><td width="20%" align="right"> <a accesskey="n" href="re44.html">Next</a></td></tr></table><hr /></div><div class="refentry" title="usb_free_urb"><a id="API-usb-free-urb"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>usb_free_urb —
frees the memory used by a urb when all users of it are finished
</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">void <b class="fsfunc">usb_free_urb </b>(</code></td><td>struct urb * <var class="pdparam">urb</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1" title="Arguments"><a id="id2743618"></a><h2>Arguments</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>urb</code></em></span></dt><dd><p>
pointer to the urb to free, may be NULL
</p></dd></dl></div></div><div class="refsect1" title="Description"><a id="id2743645"></a><h2>Description</h2><p>
Must be called when a user of a urb is finished with it. When the last user
of the urb calls this function, the memory of the urb is freed.
</p></div><div class="refsect1" title="Note"><a id="id2743657"></a><h2>Note</h2><p>
The transfer buffer associated with the urb is not freed unless the
URB_FREE_BUFFER transfer flag is set.
</p></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="re42.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="ch05.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="re44.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><span>usb_alloc_urb</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_get_urb</span></td></tr></table></div></body></html>
