From 9918d13b80941400bfab87834b1e2f1eea58c7c7 Mon Sep 17 00:00:00 2001
From: rwatson <rwatson@FreeBSD.org>
Date: Wed, 3 Aug 2005 00:18:35 +0000
Subject: Modify device drivers supporting multicast addresses to lock
 if_addr_mtx over iteration of their multicast address lists when
 synchronizing the hardware address filter with the network stack-maintained
 list.

Problem reported by:	Ed Maste (emaste at phaedrus dot sandvine dot ca>
MFC after:		1 week
---
 sys/dev/de/if_de.c | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'sys/dev/de/if_de.c')

diff --git a/sys/dev/de/if_de.c b/sys/dev/de/if_de.c
index 5fdff82..421d1aa 100644
--- a/sys/dev/de/if_de.c
+++ b/sys/dev/de/if_de.c
@@ -3026,6 +3026,7 @@ tulip_addr_filter(
 #endif
 
     multicnt = 0;
+    IF_ADDR_LOCK(sc->tulip_ifp);
     TAILQ_FOREACH(ifma, &sc->tulip_ifp->if_multiaddrs, ifma_link) {
 
 	    if (ifma->ifma_addr->sa_family == AF_LINK)
@@ -3147,6 +3148,7 @@ tulip_addr_filter(
 #endif
 	}
     }
+    IF_ADDR_UNLOCK(sc->tulip_ifp);
 #if defined(IFF_ALLMULTI)
     if (sc->tulip_flags & TULIP_ALLMULTI)
 	sc->tulip_ifp->if_flags |= IFF_ALLMULTI;
-- 
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