Hi Gavin, freebsd-net,
I submitted this PR when I worked at Coyote Point. I'm no longer
there, but I do remember this issue well. The discussion around this
patch happened on IRC and not the PR, which is unfortunate. If I
recall correctly, rwatson's stance was that the real fix was to fix
the heinous layer between ioctl and device. As far as I'm aware, this
is still an issue with current drivers, and this patch still solves
the issue. CP ran with it successfully for years. (And unsuccessfully
for a time before it was implemented :)).
The patch is basically (forgive formatting):
--- if_ethersubr.c 2011-09-22 20:51:37.000000000 -0400
+++ /home/dho/if_ethersubr.c 2012-05-16 22:27:17.000000000 -0400
@@ -1146,7 +1146,9 @@
switch (ifa->ifa_addr->sa_family) {
#ifdef INET
case AF_INET:
- ifp->if_init(ifp->if_softc); /* before arpwhohas */
+ if (ifp->if_flags & IFF_RUNNING == 0) {
+ ifp->if_init(ifp->if_softc); /*
before arpwhohas */
+ }
arp_ifinit(ifp, ifa);
break;
#endif
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