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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968" /><title>dma_release_from_coherent</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1" /><link rel="home" href="index.html" title="Linux Device Drivers" /><link rel="up" href="ch02s03.html" title="Device Drivers DMA Management" /><link rel="prev" href="API-dma-alloc-from-coherent.html" title="dma_alloc_from_coherent" /><link rel="next" href="API-dma-mmap-from-coherent.html" title="dma_mmap_from_coherent" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span class="phrase">dma_release_from_coherent</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-dma-alloc-from-coherent.html">Prev</a>&#160;</td><th width="60%" align="center">Device Drivers DMA Management</th><td width="20%" align="right">&#160;<a accesskey="n" href="API-dma-mmap-from-coherent.html">Next</a></td></tr></table><hr /></div><div class="refentry"><a id="API-dma-release-from-coherent"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>dma_release_from_coherent &#8212; 
     try to free the memory allocated from per-device coherent memory pool
 </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 <strong class="fsfunc">dma_release_from_coherent </strong>(</code></td><td>struct device * <var class="pdparam">dev</var>, </td></tr><tr><td>&#160;</td><td>int <var class="pdparam">order</var>, </td></tr><tr><td>&#160;</td><td>void * <var class="pdparam">vaddr</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1"><a id="idm140404963044192"></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>
     device from which the memory was allocated
    </p></dd><dt><span class="term"><em class="parameter"><code>order</code></em></span></dt><dd><p>
     the order of pages allocated
    </p></dd><dt><span class="term"><em class="parameter"><code>vaddr</code></em></span></dt><dd><p>
     virtual address of allocated pages
    </p></dd></dl></div></div><div class="refsect1"><a id="idm140404963036960"></a><h2>Description</h2><p>
   This checks whether the memory was allocated from the per-device
   coherent memory pool and if so, releases that memory.
   </p><p>

   Returns 1 if we correctly released the memory, or 0 if
   <code class="function">dma_release_coherent</code> should proceed with releasing memory from
   generic pools.
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