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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>blk_stop_queue</title><meta name="generator" content="DocBook XSL Stylesheets V1.75.2" /><link rel="home" href="index.html" title="The Linux Kernel API" /><link rel="up" href="ch14.html" title="Chapter 14. Block Devices" /><link rel="prev" href="re501.html" title="blk_start_queue" /><link rel="next" href="re503.html" title="blk_sync_queue" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span>blk_stop_queue</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="re501.html">Prev</a> </td><th width="60%" align="center">Chapter 14. Block Devices</th><td width="20%" align="right"> <a accesskey="n" href="re503.html">Next</a></td></tr></table><hr /></div><div class="refentry" title="blk_stop_queue"><a id="API-blk-stop-queue"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>blk_stop_queue —
stop a queue
</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">blk_stop_queue </b>(</code></td><td>struct request_queue * <var class="pdparam">q</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1" title="Arguments"><a id="id3027393"></a><h2>Arguments</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>q</code></em></span></dt><dd><p>
The <span class="structname">struct request_queue</span> in question
</p></dd></dl></div></div><div class="refsect1" title="Description"><a id="id3027424"></a><h2>Description</h2><p>
The Linux block layer assumes that a block driver will consume all
entries on the request queue when the request_fn strategy is called.
Often this will not happen, because of hardware limitations (queue
depth settings). If a device driver gets a 'queue full' response,
or if it simply chooses not to queue more I/O at one point, it can
call this function to prevent the request_fn from being called until
the driver has signalled it's ready to go again. This happens by calling
<code class="function">blk_start_queue</code> to restart queue operations. Queue lock must be held.
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