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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>handle_edge_irq</title><meta name="generator" content="DocBook XSL Stylesheets V1.75.2" /><link rel="home" href="index.html" title="Linux generic IRQ handling" /><link rel="up" href="ch09.html" title="Chapter 9. Internal Functions Provided" /><link rel="prev" href="re30.html" title="handle_fasteoi_irq" /><link rel="next" href="re32.html" title="handle_percpu_irq" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span>handle_edge_irq</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="re30.html">Prev</a> </td><th width="60%" align="center">Chapter 9. Internal Functions Provided</th><td width="20%" align="right"> <a accesskey="n" href="re32.html">Next</a></td></tr></table><hr /></div><div class="refentry" title="handle_edge_irq"><a id="API-handle-edge-irq"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>handle_edge_irq —
edge type IRQ handler
</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">void <b class="fsfunc">handle_edge_irq </b>(</code></td><td>unsigned int <var class="pdparam">irq</var>, </td></tr><tr><td> </td><td>struct irq_desc * <var class="pdparam">desc</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1" title="Arguments"><a id="id2592338"></a><h2>Arguments</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>irq</code></em></span></dt><dd><p>
the interrupt number
</p></dd><dt><span class="term"><em class="parameter"><code>desc</code></em></span></dt><dd><p>
the interrupt description structure for this irq
</p></dd></dl></div></div><div class="refsect1" title="Description"><a id="id2592381"></a><h2>Description</h2><p>
Interrupt occures on the falling and/or rising edge of a hardware
signal. The occurence is latched into the irq controller hardware
and must be acked in order to be reenabled. After the ack another
interrupt can happen on the same source even before the first one
is handled by the assosiacted event handler. If this happens it
might be necessary to disable (mask) the interrupt depending on the
controller hardware. This requires to reenable the interrupt inside
of the loop which handles the interrupts which have arrived while
the handler was running. If all pending interrupts are handled, the
loop is left.
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