<?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>Locking Between Two Hard IRQ Handlers</title><meta name="generator" content="DocBook XSL Stylesheets V1.75.2" /><link rel="home" href="index.html" title="Unreliable Guide To Locking" /><link rel="up" href="ch04.html" title="Chapter 4. Hard IRQ Context" /><link rel="prev" href="ch04.html" title="Chapter 4. Hard IRQ Context" /><link rel="next" href="ch05.html" title="Chapter 5. Cheat Sheet For Locking" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Locking Between Two Hard IRQ Handlers</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="ch04.html">Prev</a> </td><th width="60%" align="center">Chapter 4. Hard IRQ Context</th><td width="20%" align="right"> <a accesskey="n" href="ch05.html">Next</a></td></tr></table><hr /></div><div class="sect1" title="Locking Between Two Hard IRQ Handlers"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="hardirq-hardirq"></a>Locking Between Two Hard IRQ Handlers</h2></div></div></div><p> It is rare to have to share data between two IRQ handlers, but if you do, <code class="function">spin_lock_irqsave()</code> should be used: it is architecture-specific whether all interrupts are disabled inside irq handlers themselves. </p></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="ch04.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="ch04.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="ch05.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Chapter 4. Hard IRQ Context </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> Chapter 5. Cheat Sheet For Locking</td></tr></table></div></body></html>