[lwip-users] about pppClose problem?

[xcbman]

i have a problem about pppClose() func return very slow everytime(exit pppMain()), here is my trace about PPPclose():

 

06-27 11:20:48 pppMainWakeup: unit 0

 

06-27 11:20:48 pppClose:linkStatusCB==NULL

 

06-27 11:20:48 pppMain: unit 0 kill_link -> pppStopCB

 

06-27 11:20:48 pppStopCB: unit 0

 

06-27 11:20:48 link_down: 0

 

06-27 11:20:48 upap_lowerdown: 0 s=1

 

06-27 11:20:48 ipcp: down

 

06-27 11:20:48 np_down: 0 proto=21

 

06-27 11:20:48 sifvjcomp: VJ compress enable=0 slot=0 max slot=0

 

06-27 11:20:48 sifdown: unit 0: linkStatusCB=0 errCode=-5

 

06-27 11:20:48 IPCP: lowerdown state 9 (LS_OPENED) -> 1 (LS_STARTING)

 

06-27 11:20:48 IPCP: close reason=LCP down state 1 (LS_STARTING) -> 0 (LS_INITIAL)

 

06-27 11:20:48 pppLinkDown: unit 0

 

06-27 11:20:48 pppMainWakeup: unit 0

 

06-27 11:20:48 ppp_send_config[0]: outACCM=FF FF FF FF

 

06-27 11:20:48 ppp_recv_config[0]: inACCM=0 0 0 0

 

06-27 11:20:48 pppWrite[0]: len=28

 

06-27 11:20:48 fsm_sdata(LCP): Sent code 5,2,16.

 

06-27 11:20:48 LCP: close reason=User request state 9 (LS_OPENED) -> 4 (LS_CLOSING)

 

06-27 11:20:48 pppInProc[0]: got 10 bytes

 

06-27 11:20:48 pppInput[0]: IPCP len=4

 

06-27 11:20:48 fsm_input(8021): Rcvd packet in state 0 (LS_INITIAL).

 

06-27 11:20:49 pppInProc[0]: got 6 bytes

 

06-27 11:20:51 pppInProc[0]: got 12 bytes

 

06-27 11:20:54 LCP: timeout resending Terminate-Requests state=4 (LS_CLOSING)  //always timeout(6s) ,why?

 

06-27 11:20:54 pppWrite[0]: len=29

 

06-27 11:20:54 fsm_sdata(LCP): Sent code 5,3,16.

 

06-27 11:21:00 LCP: timeout sending Terminate-Request state=4 (LS_CLOSING) //always timeout(6s), why?

 

06-27 11:21:00 link_terminated: 0

 

06-27 11:21:00 Connection terminated.

 

06-27 11:21:00 pppLinkTerminated: unit 0

 

06-27 11:21:00 pppMainWakeup: unit 0

 

06-27 11:21:00 pppMain: unit 0: PHASE_DEAD

 

06-27 11:21:00 pppDrop: pbuf len=25

 

06-27 11:21:00 pppMain: unit 0: linkStatusCB=0 errCode=-5

 

06-27 11:21:00 pppClose:0 status=0 cb=0

 

////////////////////////////////////////////////////////////////////////////////////////////////////

 

here is pppCLose() source code,in my code is  pc->linkStatusCB=NULL,so it while wait for PHASE_DEAD

 

/* Close a PPP connection and release the descriptor.
 * Any outstanding packets in the queues are dropped.
 * Return 0 on success, an error code on failure. */
int
pppClose(int pd)
{
  PPPControl *pc = &pppControl[pd];
  int st = 0;

 

  /* Disconnect */
#if PPPOE_SUPPORT
  if(pc->ethif) {
    PPPDEBUG((LOG_DEBUG, "pppClose: unit %d kill_link -> pppStopCB\n", pd));
    pc->errCode = PPPERR_USER;
    /* This will leave us at PHASE_DEAD. */
    tcpip_callback(pppStopCB, (void*)pd);
  } else
#endif /* PPPOE_SUPPORT */
  {
#if PPPOS_SUPPORT
    pc->kill_link = !0;
    pppMainWakeup(pd);
#endif /* PPPOS_SUPPORT */
  }

 

  if(!pc->linkStatusCB) {  
    while(st >= 0 && lcp_phase[pd] != PHASE_DEAD) {
      sys_msleep(500);
      break; //why this break? can i remove it?
    }
  }

 

  return st;
}