The netif_list is a simple linked list: the last netif should have the
next pointer set to NULL to indicate the end of the list. It seems that
your netif_list doesn't have an end or beginning: with netif->next ==
netif, you will have many more problems, not only with DHCP!
Simon
B B wrote:
Hi List,
I have been working with lwip 1.3.0 and FreeRTOS. Which now seems to
work wonderfully.
But i have observed a minor problem with DHCP. On a few occasions i
have experienced that
the program gets stuck in dhcp_fine_tmr(). The reason for this is that
dhcp_start() hasn't been called yet.
In lwip 1.2.0 i called dhcp_start() and set the appropiate timers
afterwards. But these timers are now started
by the tcpip_thread. Which means they are started before a call to
dhcp_start() has been made.
So netif is != NULL, netif->next points to netif (only one netif) and
netif->dhcp is = NULL.
This get you stuck in the while loop.
This could be prevented by adding an extra if in function
dhcp_fine_tmer():
void
dhcp_fine_tmr()
{
struct netif *netif = netif_list;
/* loop through netif's */
while (netif != NULL) {
/* only act on DHCP configured interfaces */
if (netif->dhcp != NULL) {
/* timer is active (non zero), and is about to trigger now */
if (netif->dhcp->request_timeout > 1) {
netif->dhcp->request_timeout--;
}
else if (netif->dhcp->request_timeout == 1) {
netif->dhcp->request_timeout--;
/* { netif->dhcp->request_timeout == 0 } */
LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
("dhcp_fine_tmr(): request timeout\n"));
/* this clients' request timeout triggered */
dhcp_timeout(netif);
}
}
/* proceed to next network interface */
netif = netif->next;
+if (netif == netif->next && netif->dhcp == NULL)
+{
+ break;
+}
}
}
maybe this should also be added to the dhcp_coarse_tmr() function.
best regards,
Martin
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