1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>usb_hub_clear_tt_buffer</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="index.html" title="The Linux-USB Host Side API"><link rel="up" href="usbcore.html" title="Chapter&#160;5.&#160;USB Core APIs"><link rel="prev" href="API-usb-buffer-unmap-sg.html" title="usb_buffer_unmap_sg"><link rel="next" href="API-usb-set-device-state.html" title="usb_set_device_state"></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">usb_hub_clear_tt_buffer</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-usb-buffer-unmap-sg.html">Prev</a>&#160;</td><th width="60%" align="center">Chapter&#160;5.&#160;USB Core APIs</th><td width="20%" align="right">&#160;<a accesskey="n" href="API-usb-set-device-state.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-usb-hub-clear-tt-buffer"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>usb_hub_clear_tt_buffer &#8212; 
2  clear control/bulk TT state in high speed hub
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">int <b class="fsfunc">usb_hub_clear_tt_buffer </b>(</code></td><td>struct urb * <var class="pdparam">urb</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1"><a name="idp1116651508"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>urb</code></em></span></dt><dd><p>
4     an URB associated with the failed or incomplete split transaction
5    </p></dd></dl></div></div><div class="refsect1"><a name="idp1116653156"></a><h2>Description</h2><p>
6   High speed HCDs use this to tell the hub driver that some split control or
7   bulk transaction failed in a way that requires clearing internal state of
8   a transaction translator.  This is normally detected (and reported) from
9   interrupt context.
10   </p><p>
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12   It may not be possible for that hub to handle additional full (or low)
13   speed transactions until that state is fully cleared out.
14</p></div><div class="refsect1"><a name="idp1116654284"></a><h2>Return</h2><p>
15   0 if successful. A negative error code otherwise.
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