请教板载linux系统中遇到的USB HUB重启问题

parrot18

各位大侠：
    最近使用友善之臂的micro2440做了一个类似网关的设备，插电源运行的时候，一切正常。后来换成了电池供电。通信量大或者电池电量低的时候，系统会刷出如下信息：
（网关上有一个通过USB口连接的wifi网卡，有一个通过USB口连接的模块，这个模块会驱动出6个ttyUSB虚拟串口供程序使用。现在的问题就是运行一段时间后，所有跟USB有关的设备，即网卡、模块，它们的驱动都被先卸载后自动加载了一遍，然后我程序就崩溃了..因为卸载wifi驱动后，AP节点就不复存在了...）想请问各位大侠有遇到过这种情况吗？这是什么原因导致的。。这现象像是usb hub的一种自我保护的行为，卸载后再加载，像重启一样..linux系统有这方面的设计吗？
谢谢大家！！

RTUSB_VendorRequest failed(-19),TxFlags=0x0, ReqType=IN, Req=0x7, Index=0x1000
CMDTHREAD_RESET_BULK_IN: Cannot do bulk in because flags(0x10280102) on !
WIFI device has been disconnected
generic ttyUSB0: generic converter now disconnected from ttyUSB0
usbserial_generic 1-1.1:1.0: device disconnected
generic ttyUSB1: generic converter now disconnected from ttyUSB1
usbserial_generic 1-1.1:1.1: device disconnected
generic ttyUSB2: generic converter now disconnected from ttyUSB2
usbserial_generic 1-1.1:1.2: device disconnected
generic ttyUSB3: generic converter now disconnected from ttyUSB3
usbserial_generic 1-1.1:1.3: device disconnected
WIFI device has been disconnected
generic ttyUSB4: generic converter now disconnected from ttyUSB4
usbserial_generic 1-1.1:1.4: device disconnected
generic ttyUSB5: generic converter now disconnected from ttyUSB5
usbserial_generic 1-1.1:1.5: device disconnected
WIFI device has been disconnected
usb 1-1.4: USB disconnect, address 3
rtusb_disconnect: unregister usbnet usb-s3c24xx-1.4
RtmpOSNetDevDetach(): RtmpOSNetDeviceDetach(), dev->name=ra0!
WIFI device has been disconnected
WIFI device has been disconnected
WIFI device has been disconnected
WIFI device has been disconnected
WIFI device has been disconnected
WIFI device has been disconnected
WIFI device has been disconnected
WIFI device has been disconnected
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WIFI device has been disconnected
WIFI device has been disconnected
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WIFI device has been disconnected
WIFI device has been disconnected
WIFI device has been disconnected
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WIFI device has been disconnected
WIFI device has been disconnected
WIFI device has been disconnected
WIFI device has been disconnected
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WIFI device has been disconnected
WIFI device has been disconnected
WIFI device has been disconnected
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WIFI device has been disconnected
WIFI device has been disconnected
WIFI device has been disconnected
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WIFI device has been disconnected
WIFI device has been disconnected
WIFI device has been disconnected
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WIFI device has been disconnected
select time is over,read again...
Now Reading the Serial...
Connection terminated.
---> RTMPFreeTxRxRingMemory
<--- RTMPFreeTxRxRingMemory
RTUSB disconnect successfully
usb 1-1: new full speed USB device using s3c2410-ohci and address 6
select time is over,read again...
Now Reading the Serial...
usb 1-1: New USB device found, idVendor=058f, idProduct=9254
usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
usb 1-1: Product: Generic USB Hub
usb 1-1: Manufacturer: ALCOR
usb 1-1: configuration #1 chosen from 1 choice
hub 1-1:1.0: USB hub found
hub 1-1:1.0: 4 ports detected
usb 1-1.1: new full speed USB device using s3c2410-ohci and address 7
usb 1-1.1: New USB device found, idVendor=1e0e, idProduct=de19
usb 1-1.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
usb 1-1.1: Product: USB 2.0 Based On A2000PH
usb 1-1.1: Manufacturer: SIMCom Technology 2009
usb 1-1.1: SerialNumber: 00000000000123456789
usb 1-1.1: configuration #1 chosen from 1 choice
usbserial_generic 1-1.1:1.0: generic converter detected
usb 1-1.1: generic converter now attached to ttyUSB1
usbserial_generic 1-1.1:1.1: generic converter detected
usb 1-1.1: generic converter now attached to ttyUSB3
usbserial_generic 1-1.1:1.2: generic converter detected
usb 1-1.1: generic converter now attached to ttyUSB4
usbserial_generic 1-1.1:1.3: generic converter detected
usb 1-1.1: generic converter now attached to ttyUSB5
usbserial_generic 1-1.1:1.4: generic converter detected
usb 1-1.1: generic converter now attached to ttyUSB6
usbserial_generic 1-1.1:1.5: generic converter detected
usb 1-1.1: generic converter now attached to ttyUSB7
usb 1-1.4: new full speed USB device using s3c2410-ohci and address 8
select time is over,read again...
Now Reading the Serial...
usb 1-1.4: New USB device found, idVendor=148f, idProduct=3070
usb 1-1.4: New USB device strings: Mfr=1, Product=2, SerialNumber=3
usb 1-1.4: Product: 802.11 n WLAN
usb 1-1.4: Manufacturer: Ralink
usb 1-1.4: SerialNumber: 1.0
usb 1-1.4: configuration #1 chosen from 1 choice