David Ahern 42b6d6e824 net: mpls: Fix nexthop alive tracking on down events ... [ Upstream commit 61733c91c4 ] Alive tracking of nexthops can account for a link twice if the carrier goes down followed by an admin down of the same link rendering multipath routes useless. This is similar to 79099aab38 for UNREGISTER events and DOWN events. Fix by tracking number of alive nexthops in mpls_ifdown similar to the logic in mpls_ifup. Checking the flags per nexthop once after all events have been processed is simpler than trying to maintian a running count through all event combinations. Also, WRITE_ONCE is used instead of ACCESS_ONCE to set rt_nhn_alive per a comment from checkpatch: WARNING: Prefer WRITE_ONCE(<FOO>, <BAR>) over ACCESS_ONCE(<FOO>) = <BAR> Fixes: c89359a42e ("mpls: support for dead routes") Signed-off-by: David Ahern <dsa@cumulusnetworks.com> Acked-by: Robert Shearman <rshearma@brocade.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Sasha Levin <alexander.levin@verizon.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2017-12-20 10:07:25 +01:00
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Kconfig	mpls: ip tunnel support	2015-07-21 10:39:05 -07:00
Makefile	mpls: ip tunnel support	2015-07-21 10:39:05 -07:00
af_mpls.c	net: mpls: Fix nexthop alive tracking on down events	2017-12-20 10:07:25 +01:00
internal.h	mpls: move mpls_hdr to a common location	2016-10-03 02:00:21 -04:00
mpls_gso.c	net: mpls: Fixups for GSO	2016-08-30 22:27:18 -07:00
mpls_iptunnel.c	net: Specify the owning module for lwtunnel ops	2017-02-04 09:47:11 +01:00