Allow MOD_UNLOADs of if_tun, and handle event handler registration

failures in MOD_LOAD.

Dodge duplicate make_dev() calls by (ab)using dev->si_drv2 to
remember if we created the device node via a dev_clone callback
before the d_open call.

1 files changed, 2 insertions, 0 deletions

diff --git a/sys/net/if_tunvar.h b/sys/net/if_tunvar.h
index 9be9bf2..e5583f0 100644
--- a/sys/net/if_tunvar.h
+++ b/sys/net/if_tunvar.h
@@ -48,6 +48,8 @@ struct tun_softc {
 	struct  sigio *tun_sigio;	/* information for async I/O */
 	struct	selinfo	tun_rsel;	/* read select */
 	struct	selinfo	tun_wsel;	/* write select (not used) */
+
+	struct	tun_softc *next;	/* Next softc in list */
 };
 
 #endif /* !_NET_IF_TUNVAR_H_ */