Ubuntu12.04下使用360随身Wifi2

最近想买一块无线网卡，于是乎上京东选择网卡，结果出来的第一个就是360随身wifi2，之前就听过，外形也不错，而且很便宜，于是就想着买个回来试
试，等下完单再仔细一看，360官方说是作无线路由器用的，?大发了，本来想买网卡，结果买成了ap，无奈已经发货了，而且也不是很贵，那就算了吧，买回
来研究一下也好。但后来想想既然能当ap用，是不是理论上也能当USB无线网卡用呢？后来Google了一下发现果然是可以这样用的，只不过这部分的功能
被360提供的驱动阉割了，我所需要做的就是找到里面使用的无线收发器ic型号，然后去官网下驱动（这里给个官网下驱动的链接吧，有点不太好找：http://www.mediatek.com/_en/07_downloads/01_windows.php?sn=501）！这和我之前安装Ralink的RT5370几乎一样的步骤，具体可以参考此链接：http://blog.163.com/thinki_cao/blog/static/8394487520134514629561。

安装过程也不难，具体参考了这篇链接：http://www.freemindworld.com/blog/2013/131010_360_wifi_in_linux.shtml，
大体概括一下就是，360随身wifi2使用的是联发科的mt7601，官网上能下到驱动，然后我需要编译一下网卡的驱动（注意需要内核源码），然后再把
生成的驱动模块modprobe一下即可。前面都很顺利，最后遇到了一个问题，即我使用modprobe mt7601Usta的时候报错了：

    <div>
        <span class="pln">thinki@G31T</span><span class="pun">-</span><span class="pln">M2</span><span class="pun">:~</span><span class="pln">$ sudo modprobe mt7601Usta</span>
    </div>

    <div>
        <span class="pln">FATAL</span><span class="pun">:</span><span class="pln"> </span><span class="typ">Error</span><span class="pln"> inserting mt7601Usta </span><span class="pun">(</span><span class="str">/lib/</span><span class="pln">modules</span><span class="pun">/</span><span class="lit">3.2</span><span class="pun">.</span><span class="lit">0</span><span class="pun">-</span><span class="lit">37</span><span class="pun">-</span><span class="pln">generic</span><span class="pun">-</span><span class="pln">pae</span><span class="pun">/</span><span class="pln">kernel</span><span class="pun">/</span><span class="pln">drivers</span><span class="pun">/</span><span class="pln">net</span><span class="pun">/</span><span class="pln">wireless</span><span class="pun">/</span><span class="pln">mt7601Usta</span><span class="pun">.</span><span class="pln">ko</span><span class="pun">):</span><span class="pln"> </span><span class="typ">Device</span><span class="pln"> </span><span class="kwd">or</span><span class="pln"> resource busy</span>
    </div>

但
是作者博客上好像没有提到过这个问题，Google该错误基本找不到关键词，那么应该来说我这个是个例，应该去查找产生这种问题的比较普遍的原因，于是就
google搜索“Device or resource
busy”等比较通用的关键词，然后找到一个网址，网友提示说能不能看一下log上的内容，看log的方法就是终端中输入dmesg，看系统输出信息：

于是看到最后几行的信息：

    <div>
        <span class="pun">[</span><span class="lit">19822.971089</span><span class="pun">]</span><span class="pln"> rt<a href="https://www.whatled.com/post-tag/usb" title="查看更多关于usb的文章" target="_blank">usb</a> init rt2870 </span><span class="pun">---</span>
    </div>

    <div>
        <span class="pun">[</span><span class="lit">19822.971096</span><span class="pun">]</span><span class="pln"> </span><span class="typ">Error</span><span class="pun">:</span><span class="pln"> </span><span class="typ">Driver</span><span class="pln"> </span><span class="str">’rt2870’</span><span class="pln"> </span><span class="kwd">is</span><span class="pln"> already registered</span><span class="pun">,</span><span class="pln"> aborting</span><span class="pun">...</span>
    </div>

    <div>
        <span class="pun">[</span><span class="lit">19836.938203</span><span class="pun">]</span><span class="pln"> rt<a href="https://www.whatled.com/post-tag/usb" title="查看更多关于usb的文章" target="_blank">usb</a> init rt2870 </span><span class="pun">---</span>
    </div>

    <div>
        <span class="pun">[</span><span class="lit">19836.938208</span><span class="pun">]</span><span class="pln"> </span><span class="typ">Error</span><span class="pun">:</span><span class="pln"> </span><span class="typ">Driver</span><span class="pln"> </span><span class="str">’rt2870’</span><span class="pln"> </span><span class="kwd">is</span><span class="pln"> already registered</span><span class="pun">,</span><span class="pln"> aborting</span><span class="pun">...</span>
    </div>

    <div>
        <span class="pun">[</span><span class="lit">19852.241980</span><span class="pun">]</span><span class="pln"> </span><span class="pun">===</span><span class="pln">rt_ioctl_giwscan</span><span class="pun">.</span><span class="pln"> </span><span class="lit">16</span><span class="pun">(</span><span class="lit">16</span><span class="pun">)</span><span class="pln"> BSS returned</span><span class="pun">,</span><span class="pln"> data</span><span class="pun">-</span><span class="pln">length </span><span class="pun">=</span><span class="pln"> </span><span class="lit">1928</span>
    </div>

    <div>
        <span class="pun">[</span><span class="lit">19972.737925</span><span class="pun">]</span><span class="pln"> </span><span class="pun">===</span><span class="pln">rt_ioctl_giwscan</span><span class="pun">.</span><span class="pln"> </span><span class="lit">15</span><span class="pun">(</span><span class="lit">15</span><span class="pun">)</span><span class="pln"> BSS returned</span><span class="pun">,</span><span class="pln"> data</span><span class="pun">-</span><span class="pln">length </span><span class="pun">=</span><span class="pln"> </span><span class="lit">1903</span>
    </div>

现在在针对这里的错误信息Google一下就能找到很多相似的错误，最终发现了一个网站（不得不说国外的hacker真牛）：

http://linuxforums.org.uk/index.php?topic=852.165，有网友提出了：

Could the old driver I installed “the real RT2870” be conflicting with the new one. considering they are the same name?

也就是可能现在的RT2870驱动和新的驱动产生了冲突，我恍然意识到之前这台pc机安装过RT5370的驱动，再去官网看一下驱动，结果发现了“USB(RT2870/RT2770/RT307X/RT2070/RT357X/RT3370/RT8070/RT5X7X/MT7610/MT7601)”，即RT2870,RT5370以及360wifi用的MT7601属于同一个系列的，那么很有可能产生冲突了。然后网友给出了解决方法：

也就是先用modprobe -r命令将已经安装的驱动移除，然后再将另一个驱动modprobe进去，即：

    <div>
        <span style="line-height:28px;"><span class="pln">sudo modprobe </span><span class="pun">-</span><span class="pln">r rt5370sta</span></span>
    </div>

    <div>
        <span style="line-height:28px;"><span class="pln">sudo modprobe</span></span><span style="line-height:28px;"><span class="pln">mt7601Usta</span></span>
    </div>

没有报错，大功告成！再看一下network manager，图形界面下已经能够直接识别出无线了！

PS：从制程上来讲，rt5370用的是90nm工艺，mt7601用的是45nm工艺，所以相对来说后者在性能，功耗以及发热量等方面的表现会更好：）