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Make WITNESS happier:

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- refactor ngd_constructor, so that make_dev() is called without
  any locks held, since it mallocs memory with M_WAITOK flag.
- rename global mtx, to have name different to per-node mtx

MFC after:	2 weeks
This commit is contained in:
Gleb Smirnoff 2005-02-14 13:47:06 +00:00
parent f5e7a58e87
commit 843cfd5ae0
1 changed files with 14 additions and 20 deletions
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34
sys/netgraph/ng_device.c
View file

@ -150,44 +150,38 @@ ng_device_constructor(node_p node)
if (priv == NULL)
return (ENOMEM);
mtx_init(&priv->ngd_mtx, "ng_device", NULL, MTX_DEF);
mtx_lock(&priv->ngd_mtx);
mtx_lock(&ng_device_mtx);
priv->unit = get_free_unit();
if(priv->unit < 0) {
printf("%s: No free unit found by get_free_unit(), "
"increase MAX_NGD\n",__func__);
mtx_unlock(&ng_device_mtx);
mtx_destroy(&priv->ngd_mtx);
FREE(priv, M_NETGRAPH);
return(EINVAL);
}
priv->ngddev = make_dev(&ngd_cdevsw, unit2minor(priv->unit), UID_ROOT,
GID_WHEEL, 0600, NG_DEVICE_DEVNAME "%d", priv->unit);
if(priv->ngddev == NULL) {
printf("%s(): make_dev() failed\n",__func__);
mtx_unlock(&ng_device_mtx);
mtx_destroy(&priv->ngd_mtx);
FREE(priv, M_NETGRAPH);
return(EINVAL);
}
SLIST_INSERT_HEAD(&ngd_nodes, priv, links);
mtx_unlock(&ng_device_mtx);
/* Initialize mutexes and queue */
mtx_init(&priv->ngd_mtx, "ng_device", NULL, MTX_DEF);
mtx_init(&priv->readq.ifq_mtx, "ng_device queue", NULL, MTX_DEF);
IFQ_SET_MAXLEN(&priv->readq, ifqmaxlen);
/* Link everything together */
NG_NODE_SET_PRIVATE(node, priv);
priv->node = node;
priv->ngddev = make_dev(&ngd_cdevsw, unit2minor(priv->unit), UID_ROOT,
GID_WHEEL, 0600, NG_DEVICE_DEVNAME "%d", priv->unit);
if(priv->ngddev == NULL) {
printf("%s(): make_dev() failed\n",__func__);
mtx_destroy(&priv->ngd_mtx);
mtx_destroy(&priv->readq.ifq_mtx);
FREE(priv, M_NETGRAPH);
return(EINVAL);
}
/* XXX: race here? */
priv->ngddev->si_drv1 = priv;
mtx_unlock(&priv->ngd_mtx);
return(0);
}
@ -547,7 +541,7 @@ ng_device_mod_event(module_t mod, int event, void *data)
switch (event) {
case MOD_LOAD:
mtx_init(&ng_device_mtx, "ng_device", NULL, MTX_DEF);
mtx_init(&ng_device_mtx, "ng_device global", NULL, MTX_DEF);
break;
case MOD_UNLOAD:
mtx_destroy(&ng_device_mtx);