1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>ccw_device_clear</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="index.html" title="Writing s390 channel device drivers"><link rel="up" href="ccwdev.html" title="ccw devices"><link rel="prev" href="API-ccw-device-is-multipath.html" title="ccw_device_is_multipath"><link rel="next" href="API-ccw-device-start-key.html" title="ccw_device_start_key"></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">ccw_device_clear</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-ccw-device-is-multipath.html">Prev</a>&#160;</td><th width="60%" align="center">ccw devices</th><td width="20%" align="right">&#160;<a accesskey="n" href="API-ccw-device-start-key.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-ccw-device-clear"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>ccw_device_clear &#8212; 
2     terminate I/O request processing
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">ccw_device_clear </b>(</code></td><td>struct ccw_device * <var class="pdparam">cdev</var>, </td></tr><tr><td>&#160;</td><td>unsigned long <var class="pdparam">intparm</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1"><a name="idp1124267060"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>cdev</code></em></span></dt><dd><p>
4     target ccw device
5    </p></dd><dt><span class="term"><em class="parameter"><code>intparm</code></em></span></dt><dd><p>
6     interruption parameter; value is only used if no I/O is
7     outstanding, otherwise the intparm associated with the I/O request
8     is returned
9    </p></dd></dl></div></div><div class="refsect1"><a name="idp1124269740"></a><h2>Description</h2><p>
10   <code class="function">ccw_device_clear</code> calls csch on <em class="parameter"><code>cdev</code></em>'s subchannel.
11</p></div><div class="refsect1"><a name="idp1124270940"></a><h2>Returns</h2><p>
12   <code class="constant">0</code> on success,
13   -<code class="constant">ENODEV</code> on device not operational,
14   -<code class="constant">EINVAL</code> on invalid device state.
15</p></div><div class="refsect1"><a name="idp1124272132"></a><h2>Context</h2><p>
16   Interrupts disabled, ccw device lock held
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