1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>ata_sg_init</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="index.html" title="libATA Developer's Guide"><link rel="up" href="libataExt.html" title="Chapter&#160;4.&#160;libata Library"><link rel="prev" href="API-ata-std-qc-defer.html" title="ata_std_qc_defer"><link rel="next" href="API-ata-qc-complete.html" title="ata_qc_complete"></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">ata_sg_init</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-ata-std-qc-defer.html">Prev</a>&#160;</td><th width="60%" align="center">Chapter&#160;4.&#160;libata Library</th><td width="20%" align="right">&#160;<a accesskey="n" href="API-ata-qc-complete.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-ata-sg-init"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>ata_sg_init &#8212; 
2     Associate command with scatter-gather table.
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">ata_sg_init </b>(</code></td><td>struct ata_queued_cmd * <var class="pdparam">qc</var>, </td></tr><tr><td>&#160;</td><td>struct scatterlist * <var class="pdparam">sg</var>, </td></tr><tr><td>&#160;</td><td>unsigned int <var class="pdparam">n_elem</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1"><a name="idp1123713732"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>qc</code></em></span></dt><dd><p>
4     Command to be associated
5    </p></dd><dt><span class="term"><em class="parameter"><code>sg</code></em></span></dt><dd><p>
6     Scatter-gather table.
7    </p></dd><dt><span class="term"><em class="parameter"><code>n_elem</code></em></span></dt><dd><p>
8     Number of elements in s/g table.
9    </p></dd></dl></div></div><div class="refsect1"><a name="idp1123717292"></a><h2>Description</h2><p>
10   Initialize the data-related elements of queued_cmd <em class="parameter"><code>qc</code></em>
11   to point to a scatter-gather table <em class="parameter"><code>sg</code></em>, containing <em class="parameter"><code>n_elem</code></em>
12   elements.
13</p></div><div class="refsect1"><a name="idp1123718916"></a><h2>LOCKING</h2><p>
14   spin_lock_irqsave(host lock)
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