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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>hcd_buffer_create</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1" /><link rel="home" href="index.html" title="The Linux-USB Host Side API" /><link rel="up" href="hcd.html" title="Chapter&#160;6.&#160;Host Controller APIs" /><link rel="prev" href="API-usb-hcd-pci-shutdown.html" title="usb_hcd_pci_shutdown" /><link rel="next" href="API-hcd-buffer-destroy.html" title="hcd_buffer_destroy" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span class="phrase">hcd_buffer_create</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-usb-hcd-pci-shutdown.html">Prev</a>&#160;</td><th width="60%" align="center">Chapter&#160;6.&#160;Host Controller APIs</th><td width="20%" align="right">&#160;<a accesskey="n" href="API-hcd-buffer-destroy.html">Next</a></td></tr></table><hr /></div><div class="refentry"><a id="API-hcd-buffer-create"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>hcd_buffer_create &#8212; 
  initialize buffer pools
 </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">hcd_buffer_create </strong>(</code></td><td>struct usb_hcd * <var class="pdparam">hcd</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1"><a id="idm140259810813824"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>hcd</code></em></span></dt><dd><p>
     the bus whose buffer pools are to be initialized
    </p></dd></dl></div></div><div class="refsect1"><a id="idm140259810810624"></a><h2>Context</h2><p>
   !<code class="function">in_interrupt</code>
</p></div><div class="refsect1"><a id="idm140259810808720"></a><h2>Description</h2><p>
   Call this as part of initializing a host controller that uses the dma
   memory allocators.  It initializes some pools of dma-coherent memory that
   will be shared by all drivers using that controller, or returns a negative
   errno value on error.
   </p><p>

   Call <code class="function">hcd_buffer_destroy</code> to clean up after using those pools.
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