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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>usb_reset_device</title><meta name="generator" content="DocBook XSL Stylesheets V1.75.2" /><link rel="home" href="index.html" title="The Linux-USB Host Side API" /><link rel="up" href="ch05.html" title="Chapter 5. USB Core APIs" /><link rel="prev" href="re108.html" title="usb_root_hub_lost_power" /><link rel="next" href="re110.html" title="usb_queue_reset_device" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span>usb_reset_device</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="re108.html">Prev</a> </td><th width="60%" align="center">Chapter 5. USB Core APIs</th><td width="20%" align="right"> <a accesskey="n" href="re110.html">Next</a></td></tr></table><hr /></div><div class="refentry" title="usb_reset_device"><a id="API-usb-reset-device"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>usb_reset_device —
warn interface drivers and perform a USB port reset
</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">int <b class="fsfunc">usb_reset_device </b>(</code></td><td>struct usb_device * <var class="pdparam">udev</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1" title="Arguments"><a id="id3118557"></a><h2>Arguments</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>udev</code></em></span></dt><dd><p>
device to reset (not in SUSPENDED or NOTATTACHED state)
</p></dd></dl></div></div><div class="refsect1" title="Description"><a id="id3118585"></a><h2>Description</h2><p>
Warns all drivers bound to registered interfaces (using their pre_reset
method), performs the port reset, and then lets the drivers know that
the reset is over (using their post_reset method).
</p><p>
Return value is the same as for <code class="function">usb_reset_and_verify_device</code>.
</p><p>
The caller must own the device lock. For example, it's safe to use
this from a driver <code class="function">probe</code> routine after downloading new firmware.
For calls that might not occur during <code class="function">probe</code>, drivers should lock
the device using <code class="function">usb_lock_device_for_reset</code>.
</p><p>
If an interface is currently being probed or disconnected, we assume
its driver knows how to handle resets. For all other interfaces,
if the driver doesn't have pre_reset and post_reset methods then
we attempt to unbind it and rebind afterward.
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