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graph: don't let required number of ports become negative

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Add a check against letting the required number of ports become
negative for a node. With certain timing between the main and data
thread, this can otherwise happen.

For nodes where links are unlinked and relinked, a negative number may
mean that the scheduler skips the node and doesn't call
process_output().
This commit is contained in:
David Svensson Fors 2017-12-01 16:31:37 +01:00 • committed by Wim Taymans
parent c1aa3b4625
commit 6503351a0d
1 changed files with 3 additions and 1 deletions
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4
spa/include/spa/graph/graph.h
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@ -160,8 +160,10 @@ static inline void spa_graph_port_remove(struct spa_graph_port *port)
{
spa_debug("port %p remove", port);
spa_list_remove(&port->link);
if (!(port->flags & SPA_PORT_INFO_FLAG_OPTIONAL))
if (!(port->flags & SPA_PORT_INFO_FLAG_OPTIONAL) &&
port->node->required[port->direction] > 0) {
port->node->required[port->direction]--;
}
}
static inline void