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tipc: simplify group LEAVE sequence

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After the changes in the previous commit the group LEAVE sequence
can be simplified.

We now let the arrival of a LEAVE message unconditionally issue a group
DOWN event to the user. When a topology WITHDRAW event is received, the
member, if it still there, is set to state LEAVING, but we only issue a
group DOWN event when the link to the peer node is gone, so that no
LEAVE message is to be expected.

Acked-by: Ying Xue <ying.xue@windriver.com>
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 2018-01-08 21:03:27 +01:00 committed by David S. Miller
parent 7ad32bcb78
commit c2b22bcf2e
1 changed files with 9 additions and 31 deletions
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40
net/tipc/group.c
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@ -749,14 +749,8 @@ void tipc_group_proto_rcv(struct tipc_group *grp, bool *usr_wakeup,
list_del_init(&m->list);
list_del_init(&m->small_win);
*usr_wakeup = true;
/* Wait until WITHDRAW event is received */
if (m->state != MBR_LEAVING) {
tipc_group_decr_active(grp, m);
m->state = MBR_LEAVING;
return;
}
/* Otherwise deliver member WITHDRAW event */
tipc_group_decr_active(grp, m);
m->state = MBR_LEAVING;
tipc_group_create_event(grp, m, TIPC_WITHDRAWN,
m->bc_syncpt, inputq);
return;
@ -838,7 +832,6 @@ void tipc_group_member_evt(struct tipc_group *grp,
int event = evt->event;
struct tipc_member *m;
struct net *net;
bool node_up;
u32 self;
if (!grp)
@ -878,30 +871,15 @@ void tipc_group_member_evt(struct tipc_group *grp,
*usr_wakeup = true;
m->usr_pending = false;
node_up = tipc_node_is_up(net, node);
if (node_up) {
/* Hold back event if a LEAVE msg should be expected */
if (m->state != MBR_LEAVING) {
tipc_group_decr_active(grp, m);
m->state = MBR_LEAVING;
} else {
tipc_group_create_event(grp, m, TIPC_WITHDRAWN,
m->bc_syncpt, inputq);
}
} else {
if (m->state != MBR_LEAVING) {
tipc_group_decr_active(grp, m);
m->state = MBR_LEAVING;
tipc_group_create_event(grp, m, TIPC_WITHDRAWN,
m->bc_rcv_nxt, inputq);
} else {
tipc_group_create_event(grp, m, TIPC_WITHDRAWN,
m->bc_syncpt, inputq);
}
}
tipc_group_decr_active(grp, m);
m->state = MBR_LEAVING;
list_del_init(&m->list);
list_del_init(&m->small_win);
/* Only send event if no LEAVE message can be expected */
if (!tipc_node_is_up(net, node))
tipc_group_create_event(grp, m, TIPC_WITHDRAWN,
m->bc_rcv_nxt, inputq);
}
*sk_rcvbuf = tipc_group_rcvbuf_limit(grp);
}