1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>atapi_check_dma</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="libataInt.html" title="Chapter&#160;5.&#160;libata Core Internals"><link rel="prev" href="API-ata-sg-clean.html" title="ata_sg_clean"><link rel="next" href="API-ata-sg-setup.html" title="ata_sg_setup"></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">atapi_check_dma</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-ata-sg-clean.html">Prev</a>&#160;</td><th width="60%" align="center">Chapter&#160;5.&#160;libata Core Internals</th><td width="20%" align="right">&#160;<a accesskey="n" href="API-ata-sg-setup.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-atapi-check-dma"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>atapi_check_dma &#8212; 
2     Check whether ATAPI DMA can be supported
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">atapi_check_dma </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="idp1124268260"></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     Metadata associated with taskfile to check
5    </p></dd></dl></div></div><div class="refsect1"><a name="idp1124269884"></a><h2>Description</h2><p>
6   Allow low-level driver to filter ATA PACKET commands, returning
7   a status indicating whether or not it is OK to use DMA for the
8   supplied PACKET command.
9</p></div><div class="refsect1"><a name="idp1124270644"></a><h2>LOCKING</h2><p>
10   spin_lock_irqsave(host lock)
11</p></div><div class="refsect1"><a name="idp1124271276"></a><h2>RETURNS</h2><p>
12   0 when ATAPI DMA can be used
13   nonzero otherwise
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