1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>usb_buffer_unmap_sg</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="index.html" title="The Linux-USB Host Side API"><link rel="up" href="usbcore.html" title="Chapter&#160;5.&#160;USB Core APIs"><link rel="prev" href="API-usb-buffer-dmasync-sg.html" title="usb_buffer_dmasync_sg"><link rel="next" href="API-usb-hub-clear-tt-buffer.html" title="usb_hub_clear_tt_buffer"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span class="phrase">usb_buffer_unmap_sg</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-usb-buffer-dmasync-sg.html">Prev</a>&#160;</td><th width="60%" align="center">Chapter&#160;5.&#160;USB Core APIs</th><td width="20%" align="right">&#160;<a accesskey="n" href="API-usb-hub-clear-tt-buffer.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-usb-buffer-unmap-sg"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>usb_buffer_unmap_sg &#8212; 
2     free DMA mapping(s) for a scatterlist
3 </p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><div class="funcsynopsis"><table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">void <b class="fsfunc">usb_buffer_unmap_sg </b>(</code></td><td>const struct usb_device * <var class="pdparam">dev</var>, </td></tr><tr><td>&#160;</td><td>int <var class="pdparam">is_in</var>, </td></tr><tr><td>&#160;</td><td>struct scatterlist * <var class="pdparam">sg</var>, </td></tr><tr><td>&#160;</td><td>int <var class="pdparam">n_hw_ents</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1"><a name="idp1116640948"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>dev</code></em></span></dt><dd><p>
4     device to which the scatterlist will be mapped
5    </p></dd><dt><span class="term"><em class="parameter"><code>is_in</code></em></span></dt><dd><p>
6     mapping transfer direction
7    </p></dd><dt><span class="term"><em class="parameter"><code>sg</code></em></span></dt><dd><p>
8     the scatterlist to unmap
9    </p></dd><dt><span class="term"><em class="parameter"><code>n_hw_ents</code></em></span></dt><dd><p>
10     the positive return value from usb_buffer_map_sg
11    </p></dd></dl></div></div><div class="refsect1"><a name="idp1116645660"></a><h2>Description</h2><p>
12   Reverses the effect of <code class="function">usb_buffer_map_sg</code>.
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