linux - why USB Device gets disconnected immediately after successful probe -

linux - why USB Device gets disconnected immediately after successful probe -

i learning how write kernel module usb devices, changed usb_skeleton sample found in 'drivers/usb_skeleton.c' according vid/pid of usb device. able insert module using insmod. after plugging in, device probe function beingness called , returns successfully, after disconnect function gets called.

when seek lsmod(the device still plugged in) shows driver not beingness used device.

dmesg after insmod:

[ 207.206082] usb_skeleton: module verification failed: signature and/or required key missing - tainting kernel

[ 207.206451] usbcore: registered new interface driver skeleton

dmesg after device plugged in:

[ 275.794675] skeleton 1-1.2:1.0: usb skeleton device attached usbskel-1

[ 275.946207] usb 1-1.2: usbfs: interface 0 claimed skeleton while 'brltty' sets config #1

[ 275.946924] skeleton 1-1.2:1.0: usb skeleton #1 disconnected

please guide me going wrong cause device disconnected.

linux linux-kernel linux-device-driver