<?xml version="1.0" encoding="ANSI_X3.4-1968" standalone="no"?> <!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>__check_region</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1" /><link rel="home" href="index.html" title="The Linux Kernel API" /><link rel="up" href="ch09s03.html" title="Resources Management" /><link rel="prev" href="API---request-region.html" title="__request_region" /><link rel="next" href="API---release-region.html" title="__release_region" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span class="phrase">__check_region</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API---request-region.html">Prev</a> </td><th width="60%" align="center">Resources Management</th><td width="20%" align="right"> <a accesskey="n" href="API---release-region.html">Next</a></td></tr></table><hr /></div><div class="refentry"><a id="API---check-region"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>__check_region — check if a resource region is busy or free </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">__check_region </strong>(</code></td><td>struct resource * <var class="pdparam">parent</var>, </td></tr><tr><td> </td><td>resource_size_t <var class="pdparam">start</var>, </td></tr><tr><td> </td><td>resource_size_t <var class="pdparam">n</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1"><a id="idm139749896338304"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>parent</code></em></span></dt><dd><p> parent resource descriptor </p></dd><dt><span class="term"><em class="parameter"><code>start</code></em></span></dt><dd><p> resource start address </p></dd><dt><span class="term"><em class="parameter"><code>n</code></em></span></dt><dd><p> resource region size </p></dd></dl></div></div><div class="refsect1"><a id="idm139749896331104"></a><h2>Description</h2><p> Returns 0 if the region is free at the moment it is checked, returns <code class="constant">-EBUSY</code> if the region is busy. </p></div><div class="refsect1"><a id="idm139749896329360"></a><h2>NOTE</h2><p> This function is deprecated because its use is racy. Even if it returns 0, a subsequent call to <code class="function">request_region</code> may fail because another driver etc. just allocated the region. Do NOT use it. It will be removed from the kernel. </p></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="API---request-region.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="ch09s03.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="API---release-region.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><span class="phrase">__request_region</span> </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> <span class="phrase">__release_region</span></td></tr></table></div></body></html>