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Don't free a structure containing a 'struct callout' structure while that

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callout is still pending.

MFC after:	3 days
This commit is contained in:
Archie Cobbs 2001-12-15 20:48:53 +00:00
parent 5c2c21f4a9
commit 6c12c2b195
1 changed files with 17 additions and 8 deletions
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25
sys/netgraph/ng_bridge.c
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@ -334,9 +334,10 @@ ng_bridge_constructor(node_p node)
NG_NODE_SET_PRIVATE(node, priv);
priv->node = node;
/* Start timer by faking a timeout event */
NG_NODE_REF(node); /* because the timeout will drop a reference */
ng_bridge_timeout(node);
/* Start timer; timer is always running while node is alive */
callout_reset(&priv->timer, hz, ng_bridge_timeout, priv->node);
/* Done */
return (0);
}
@ -766,13 +767,17 @@ ng_bridge_shutdown(node_p node)
{
const priv_p priv = NG_NODE_PRIVATE(node);
/*
* Shut down everything except the timer. There's no way to
* avoid another possible timeout event (it may have already
* been dequeued), so we can't free the node yet.
*/
KASSERT(priv->numLinks == 0 && priv->numHosts == 0,
("%s: numLinks=%d numHosts=%d",
__func__, priv->numLinks, priv->numHosts));
FREE(priv->tab, M_NETGRAPH_BRIDGE);
FREE(priv, M_NETGRAPH_BRIDGE);
NG_NODE_SET_PRIVATE(node, NULL);
NG_NODE_UNREF(node);
/* NG_INVALID flag is now set so node will be freed at next timeout */
return (0);
}
@ -967,6 +972,8 @@ ng_bridge_remove_hosts(priv_p priv, int linkNum)
* we decrement link->loopCount for those links being muted due to
* a detected loopback condition, and we remove any hosts from
* the hashtable whom we haven't heard from in a long while.
*
* If the node has the NG_INVALID flag set, out job is to kill it.
*/
static void
ng_bridge_timeout(void *arg)
@ -977,9 +984,11 @@ ng_bridge_timeout(void *arg)
int counter = 0;
int linkNum;
/* Avoid race condition with ng_bridge_shutdown() */
/* If node was shut down, this is the final lingering timeout */
s = splnet();
if ((NG_NODE_NOT_VALID(node)) || priv == NULL) {
if (NG_NODE_NOT_VALID(node)) {
FREE(priv, M_NETGRAPH);
NG_NODE_SET_PRIVATE(node, NULL);
NG_NODE_UNREF(node);
splx(s);
return;