1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>disable_hardirq</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="hardware.html#idp1125715868" title="Interrupt Handling"><link rel="prev" href="API-disable-irq.html" title="disable_irq"><link rel="next" href="API-enable-irq.html" title="enable_irq"></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">disable_hardirq</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-disable-irq.html">Prev</a>&#160;</td><th width="60%" align="center">Interrupt Handling</th><td width="20%" align="right">&#160;<a accesskey="n" href="API-enable-irq.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-disable-hardirq"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>disable_hardirq &#8212; 
2     disables an irq and waits for hardirq completion
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">bool <b class="fsfunc">disable_hardirq </b>(</code></td><td>unsigned int <var class="pdparam">irq</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1"><a name="idp1125761020"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>irq</code></em></span></dt><dd><p>
4     Interrupt to disable
5    </p></dd></dl></div></div><div class="refsect1"><a name="idp1125762620"></a><h2>Description</h2><p>
6   Disable the selected interrupt line.  Enables and Disables are
7   nested.
8   This function waits for any pending hard IRQ handlers for this
9   interrupt to complete before returning. If you use this function while
10   holding a resource the hard IRQ handler may need you will deadlock.
11   </p><p>
12
13   When used to optimistically disable an interrupt from atomic context
14   the return value must be checked.
15</p></div><div class="refsect1"><a name="idp1125763764"></a><h2>Returns</h2><p>
16   false if a threaded handler is active.
17   </p><p>
18
19   This function may be called - with care - from IRQ context.
20</p></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="API-disable-irq.html">Prev</a>&#160;</td><td width="20%" align="center"><a accesskey="u" href="hardware.html#idp1125715868">Up</a></td><td width="40%" align="right">&#160;<a accesskey="n" href="API-enable-irq.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><span class="phrase">disable_irq</span>&#160;</td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top">&#160;<span class="phrase">enable_irq</span></td></tr></table></div></body></html>
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