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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>ata_sg_init</title><meta name="generator" content="DocBook XSL Stylesheets V1.75.2" /><link rel="home" href="index.html" title="libATA Developer's Guide" /><link rel="up" href="ch04.html" title="Chapter 4. libata Library" /><link rel="prev" href="re37.html" title="ata_std_qc_defer" /><link rel="next" href="re39.html" title="ata_qc_complete" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span>ata_sg_init</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="re37.html">Prev</a> </td><th width="60%" align="center">Chapter 4. libata Library</th><td width="20%" align="right"> <a accesskey="n" href="re39.html">Next</a></td></tr></table><hr /></div><div class="refentry" title="ata_sg_init"><a id="API-ata-sg-init"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>ata_sg_init —
Associate command with scatter-gather table.
</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">ata_sg_init </b>(</code></td><td>struct ata_queued_cmd * <var class="pdparam">qc</var>, </td></tr><tr><td> </td><td>struct scatterlist * <var class="pdparam">sg</var>, </td></tr><tr><td> </td><td>unsigned int <var class="pdparam">n_elem</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1" title="Arguments"><a id="id2897718"></a><h2>Arguments</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>qc</code></em></span></dt><dd><p>
Command to be associated
</p></dd><dt><span class="term"><em class="parameter"><code>sg</code></em></span></dt><dd><p>
Scatter-gather table.
</p></dd><dt><span class="term"><em class="parameter"><code>n_elem</code></em></span></dt><dd><p>
Number of elements in s/g table.
</p></dd></dl></div></div><div class="refsect1" title="Description"><a id="id2897777"></a><h2>Description</h2><p>
Initialize the data-related elements of queued_cmd <em class="parameter"><code>qc</code></em>
to point to a scatter-gather table <em class="parameter"><code>sg</code></em>, containing <em class="parameter"><code>n_elem</code></em>
elements.
</p></div><div class="refsect1" title="LOCKING"><a id="id2897804"></a><h2>LOCKING</h2><p>
spin_lock_irqsave(host lock)
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