插上AR9271 USB网卡，出现以下提示，说明驱动正常挂载了
usb 1-2: new full speed USB device number 9
usb 1-2: ath9k_htc: Firmware htc_9271.fw requested
usb 1-2: ath9k_htc: Transferred FW: htc_9271.fw, size: 51272
ath9k_htc 1-2:1.0: ath9k_htc: HTC initialized with 33 credits
ath9k_htc 1-2:1.0: ath9k_htc: FW Version: 1.3
ieee80211 phy0: Atheros AR9271 Rev:1
然后输入，ifconfig wlan0 up
怎么没有反应？？？
