Jiri Pirko b0d11b4278 team: avoid possible underflow of count_pending value for notify_peers and mcast_rejoin ... This patch is fixing a race condition that may cause setting count_pending to -1, which results in unwanted big bulk of arp messages (in case of "notify peers"). Consider following scenario: count_pending == 2 CPU0 CPU1 team_notify_peers_work atomic_dec_and_test (dec count_pending to 1) schedule_delayed_work team_notify_peers atomic_add (adding 1 to count_pending) team_notify_peers_work atomic_dec_and_test (dec count_pending to 1) schedule_delayed_work team_notify_peers_work atomic_dec_and_test (dec count_pending to 0) schedule_delayed_work team_notify_peers_work atomic_dec_and_test (dec count_pending to -1) Fix this race by using atomic_dec_if_positive - that will prevent count_pending running under 0. Fixes: fc423ff00d ("team: add peer notification") Fixes: 492b200efd ("team: add support for sending multicast rejoins") Signed-off-by: Jiri Pirko <jiri@resnulli.us> Signed-off-by: Jiri Benc <jbenc@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>		2015-01-14 16:53:57 -05:00
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Kconfig	team: introduce random mode	2013-03-06 14:55:20 -05:00
Makefile	team: introduce random mode	2013-03-06 14:55:20 -05:00
team.c	team: avoid possible underflow of count_pending value for notify_peers and mcast_rejoin	2015-01-14 16:53:57 -05:00
team_mode_activebackup.c	team: ab: set active port option as changed when port is leaving	2013-02-04 14:55:45 -05:00
team_mode_broadcast.c	team: introduce two default team_modeop functions and use them in modes	2013-03-06 14:55:20 -05:00
team_mode_loadbalance.c	net: filter: split 'struct sk_filter' into socket and bpf parts	2014-08-02 15:03:58 -07:00
team_mode_random.c	random32: add prandom_u32_max and convert open coded users	2014-01-21 23:17:20 -08:00
team_mode_roundrobin.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2013-06-19 16:49:39 -07:00