PERFORCE change 81438 for review
Robert Watson
rwatson at FreeBSD.org
Thu Aug 4 11:07:37 GMT 2005
http://perforce.freebsd.org/chv.cgi?CH=81438
Change 81438 by rwatson at rwatson_zoo on 2005/08/04 11:06:58
Annotate problem with if_addr_mtx locking in the vlan code, the
reason that I haven't yet merged thes changes.
Affected files ...
.. //depot/projects/netsmp/src/sys/net/if_vlan.c#3 edit
Differences ...
==== //depot/projects/netsmp/src/sys/net/if_vlan.c#3 (text+ko) ====
@@ -188,6 +188,15 @@
}
/* Now program new ones. */
+
+ /*
+ * XXXRW: Really, this should happen in two steps, interlocked by the
+ * vlan mutex (if any: first, the parent interface's address list
+ * should be propagated to the softc, then from the softc to the
+ * child, in order to avoid holding parent's and child's if_addr_mtx
+ * at the same time. Races can occur, but won't result in
+ * incorrectness. Assuming there is a vlan mutex.
+ */
IF_ADDR_LOCK(ifp);
TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
if (ifma->ifma_addr->sa_family != AF_LINK)
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