最新的Android版本为啥串口一直在循环输出一下log呢：（tily4412-1312增强型开发板，用的pcie-mini接口，接的中兴MF210 3G模块）
[ 1152.585000] usb 1-2.3.1: new high-speed USB device number 42 using s5p-ehci
[ 1152.690000] usb 1-2.3.1: New USB device found, idVendor=19d2, idProduct=0117
[ 1152.690000] usb 1-2.3.1: New USB device strings: Mfr=3, Product=2, SerialNumber=0
[ 1152.690000] usb 1-2.3.1: Product: ZTE WCDMA Technologies MSM
[ 1152.690000] usb 1-2.3.1: Manufacturer: ZTE,Incorporated
[ 1152.700000] option 1-2.3.1:1.0: GSM modem (1-port) converter detected
[ 1152.705000] usb 1-2.3.1: GSM modem (1-port) converter now attached to ttyUSB0
[ 1152.715000] option 1-2.3.1:1.1: GSM modem (1-port) converter detected
[ 1152.715000] usb 1-2.3.1: GSM modem (1-port) converter now attached to ttyUSB1
[ 1152.720000] option 1-2.3.1:1.2: GSM modem (1-port) converter detected
[ 1152.730000] usb 1-2.3.1: GSM modem (1-port) converter now attached to ttyUSB2
[ 1214.605000] usb 1-2.3.1: USB disconnect, device number 42
[ 1214.605000] option1 ttyUSB0: GSM modem (1-port) converter now disconnected from ttyUSB0
[ 1214.605000] option 1-2.3.1:1.0: device disconnected
[ 1214.605000] option1 ttyUSB1: GSM modem (1-port) converter now disconnected from ttyUSB1
[ 1214.610000] option 1-2.3.1:1.1: device disconnected
[ 1214.615000] option1 ttyUSB2: option_instat_callback: error -108
[ 1214.620000] option1 ttyUSB2: GSM modem (1-port) converter now disconnected from ttyUSB2
[ 1214.630000] option 1-2.3.1:1.2: device disconnected
从字面上看是在循环的进行发现3G模块和销毁3G模块，这是神马情况？
