Description of problem:
The serial port is not open after LCP terminated by peer

Version-Release number of selected component (if applicable):


How reproducible:
Plug Bandluxe c339 HSPA+,Bus 001 Device 006: ID 1a8d:2006 BandRich, Inc., Icera based with ttyACM0, ttyACM1, and ethernet port.

Steps to Reproduce:
1. Plug and connect
2. Peer disconnect
3. Modem port unavaliable any more 
4. replug usb...
  
Actual results:
bad manage of peer actions

Expected results:
reconnect and work

Additional info:

NetworkManager[668]: rcvd [LCP TermReq id=0x0 "0024: Normal Termination by NCP"]
pppd[1340]: LCP terminated by peer (0024: Normal Termination by NCP)
NetworkManager[668]: LCP terminated by peer (0024: Normal Termination by NCP)
NetworkManager[668]: ** Message: nm-ppp-plugin: (nm_phasechange): status 8 / phase 'network'
pppd[1340]: Connect time 231.9 minutes.
NetworkManager[668]: Connect time 231.9 minutes.
pppd[1340]: Sent 31111034 bytes, received 283709133 bytes.
NetworkManager[668]: Sent 31111034 bytes, received 283709133 bytes.
NetworkManager[668]: Script /etc/ppp/ip-down started (pid 6834)
NetworkManager[668]: ** Message: nm-ppp-plugin: (nm_phasechange): status 5 / phase 'establish'
NetworkManager[668]: sent [LCP TermAck id=0x0]
pppd[1340]: Modem hangup
...
NetworkManager[668]: <info> disconnect failed: (32) The serial port is not open.
...
[nm-device-ethernet.c:752] real_update_permanent_hw_address(): (eth2): unable to read permanent MAC address (error 0)
1330022965.941457] [nm-device-ethernet.c:752] real_update_permanent_hw_address(): (eth2): unable to read permanent MAC address (error 0)
nager[668]: <info> (eth2): carrier is OFF

....
cdc_acm 1-8.4.1...: ttyACM0: USB ACM device
cdc_acm 1-8.4.1...: ttyACM1: USB ACM device
usbcore: registered new interface driver cdc_acm
cdc_acm: USB Abstract Control Model driver for USB modems and ISDN adapters
cdc_ether 1-8.4.1... eth2: register 'cdc_ether' at usb-0000:00:10.4-8.4.1..., CDC Ethernet Device, <MAC>
usbcore: registered new interface driver cdc_ether