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tipc: remove joining group member from congested list 

When we receive a JOIN message from a peer member, the message may
contain an advertised window value ADV_IDLE that permits removing the
member in question from the tipc_group::congested list. However, since
the removal has been made conditional on that the advertised window is
*not* ADV_IDLE, we miss this case. This has the effect that a sender
sometimes may enter a state of permanent, false, broadcast congestion.

We fix this by unconditinally removing the member from the congested
list before calling tipc_member_update(), which might potentially sort
it into the list again.

Signed-off-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jon Maloy 2017-12-20 11:03:15 +01:00 committed by David S. Miller
parent 1c8e77fb36
commit bb25c3855a
1 changed files with 2 additions and 4 deletions
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6
net/tipc/group.c
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@ -689,10 +689,8 @@ void tipc_group_proto_rcv(struct tipc_group *grp, bool *usr_wakeup,
msg_set_grp_bc_seqno(ehdr, m->bc_syncpt);
__skb_queue_tail(inputq, m->event_msg);
}
if (m->window < ADV_IDLE)
tipc_group_update_member(m, 0);
else
list_del_init(&m->congested);
list_del_init(&m->congested);
tipc_group_update_member(m, 0);
return;
case GRP_LEAVE_MSG:
if (!m)