1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>blk_stop_queue</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="blkdev.html" title="Chapter&#160;14.&#160;Block Devices"><link rel="prev" href="API-blk-start-queue.html" title="blk_start_queue"><link rel="next" href="API-blk-sync-queue.html" title="blk_sync_queue"></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">blk_stop_queue</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-blk-start-queue.html">Prev</a>&#160;</td><th width="60%" align="center">Chapter&#160;14.&#160;Block Devices</th><td width="20%" align="right">&#160;<a accesskey="n" href="API-blk-sync-queue.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-blk-stop-queue"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>blk_stop_queue &#8212; 
2     stop a queue
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">void <b class="fsfunc">blk_stop_queue </b>(</code></td><td>struct request_queue * <var class="pdparam">q</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1"><a name="idp1127799700"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>q</code></em></span></dt><dd><p>
4     The <span class="structname">struct request_queue</span> in question
5    </p></dd></dl></div></div><div class="refsect1"><a name="idp1127801524"></a><h2>Description</h2><p>
6   The Linux block layer assumes that a block driver will consume all
7   entries on the request queue when the request_fn strategy is called.
8   Often this will not happen, because of hardware limitations (queue
9   depth settings). If a device driver gets a 'queue full' response,
10   or if it simply chooses not to queue more I/O at one point, it can
11   call this function to prevent the request_fn from being called until
12   the driver has signalled it's ready to go again. This happens by calling
13   <code class="function">blk_start_queue</code> to restart queue operations. Queue lock must be held.
14</p></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="API-blk-start-queue.html">Prev</a>&#160;</td><td width="20%" align="center"><a accesskey="u" href="blkdev.html">Up</a></td><td width="40%" align="right">&#160;<a accesskey="n" href="API-blk-sync-queue.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><span class="phrase">blk_start_queue</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">blk_sync_queue</span></td></tr></table></div></body></html>
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