1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>ata_std_qc_defer</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-dev-set-feature.html" title="ata_dev_set_feature"><link rel="next" href="API-ata-sg-init.html" title="ata_sg_init"></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_std_qc_defer</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-ata-dev-set-feature.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-sg-init.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-ata-std-qc-defer"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>ata_std_qc_defer &#8212; 
2     Check whether a qc needs to be deferred
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">int <b class="fsfunc">ata_std_qc_defer </b>(</code></td><td>struct ata_queued_cmd * <var class="pdparam">qc</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1"><a name="idp1123704612"></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     ATA command in question
5    </p></dd></dl></div></div><div class="refsect1"><a name="idp1123706180"></a><h2>Description</h2><p>
6   Non-NCQ commands cannot run with any other command, NCQ or
7   not.  As upper layer only knows the queue depth, we are
8   responsible for maintaining exclusion.  This function checks
9   whether a new command <em class="parameter"><code>qc</code></em> can be issued.
10</p></div><div class="refsect1"><a name="idp1123707284"></a><h2>LOCKING</h2><p>
11   spin_lock_irqsave(host lock)
12</p></div><div class="refsect1"><a name="idp1123707900"></a><h2>RETURNS</h2><p>
13   ATA_DEFER_* if deferring is needed, 0 otherwise.
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