o Introduce carp_multicast_cleanup(), which removes and frees

multicast addresses from carp interface. [1]

o Rewrite carpdetach(), so that it does the following things: [1]

• Stops callouts.
• Decrements carp_suppress_preempt, if needed.
• Downs interface and sets CARP state to INIT.
• Calls carp_multicast_cleanup().
• Detaches softc from carp_if and if we are the last frees the carp_if.

o Use new carpdetach() in carp_clone_destroy().
o In carp_ifdetach() acquire the carp_if lock and cleanup all

interfaces hanging on carp_if. [1]

o Make carp_ifdetach() static and use EVENT(9) to call it

from if_detach(). [2]

o In carp_setrun() exit if the softc doesn't have a valid pointer

to parent. [1]

Obtained from: OpenBSD [1]
Submitted by: Dan Lukes <dan obluda.cz> [2]
PR: kern/82908 [2]