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<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968" /><title>device_for_each_child</title><meta name="generator" content="DocBook XSL Stylesheets V1.75.2" /><link rel="home" href="index.html" title="Linux Device Drivers" /><link rel="up" href="ch02.html#id2617423" title="Device Drivers Base" /><link rel="prev" href="re188.html" title="device_unregister" /><link rel="next" href="re190.html" title="device_find_child" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span>device_for_each_child</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="re188.html">Prev</a> </td><th width="60%" align="center">Device Drivers Base</th><td width="20%" align="right"> <a accesskey="n" href="re190.html">Next</a></td></tr></table><hr /></div><div class="refentry" title="device_for_each_child"><a id="API-device-for-each-child"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>device_for_each_child —
device child iterator.
</p></div><div class="refsynopsisdiv" title="Synopsis"><h2>Synopsis</h2><div class="funcsynopsis"><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0" class="funcprototype-table"><tr><td><code class="funcdef">int <b class="fsfunc">device_for_each_child </b>(</code></td><td>struct device * <var class="pdparam">parent</var>, </td></tr><tr><td> </td><td>void * <var class="pdparam">data</var>, </td></tr><tr><td> </td><td>int (*<var class="pdparam">fn</var>)
<code>(</code>struct device *dev, void *data<code>)</code><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1" title="Arguments"><a id="id2621043"></a><h2>Arguments</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>parent</code></em></span></dt><dd><p>
parent struct device.
</p></dd><dt><span class="term"><em class="parameter"><code>data</code></em></span></dt><dd><p>
data for the callback.
</p></dd><dt><span class="term"><em class="parameter"><code>fn</code></em></span></dt><dd><p>
function to be called for each device.
</p></dd></dl></div></div><div class="refsect1" title="Description"><a id="id2621104"></a><h2>Description</h2><p>
Iterate over <em class="parameter"><code>parent</code></em>'s child devices, and call <em class="parameter"><code>fn</code></em> for each,
passing it <em class="parameter"><code>data</code></em>.
</p><p>
We check the return of <em class="parameter"><code>fn</code></em> each time. If it returns anything
other than 0, we break out and return that value.
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