Re: [lwip-users] DHCP and Ethernet disconnection

[Sylvain Rochet]

Hi,

On Tue, Dec 10, 2019 at 04:13:33PM +0530, Vinu Gopalakrishnan wrote:
> Hi  Giuseppe,
> 
> You have to enable your  PHY interrupt and on interrupt , read the PHY
> registers and verify that the physical link is down. Then intimate the
> stack that link has gone down using the  netif_set_link_down. Then can
> dhcp_network_changed().

This is confusing, never call netif_set_link_*() from interrupt context, 
those calls are not thread nor interrupt safe.

You can either use PHY interrupt then signal your main loop in some way 
to call netif_set_link_*(), or periodically poll the PHY status in the 
main loop.

OS users should use the netifapi API: netif_set_link_*().

Sylvain

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