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ipw2200: expire and use oldest BSS on adhoc create 

If there are no networks on the free list, expire the oldest one when
creating a new adhoc network.  Because ipw2200 and the ieee80211 stack
don't actually cull old networks and place them back on the free list
unless they are needed for new probe responses, over time the free list
would become empty and creating an adhoc network would fail due to the !
list_empty(...) check.

Signed-off-by: Dan Williams <dcbw@redhat.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Dan Williams 2008-05-29 14:38:28 -04:00 committed by John W. Linville
parent b212f3378a
commit a6d4eae801
1 changed files with 25 additions and 2 deletions
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27
drivers/net/wireless/ipw2200.c
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@ -7558,8 +7558,31 @@ static int ipw_associate(void *data)
priv->ieee->iw_mode == IW_MODE_ADHOC &&
priv->config & CFG_ADHOC_CREATE &&
priv->config & CFG_STATIC_ESSID &&
priv->config & CFG_STATIC_CHANNEL &&
!list_empty(&priv->ieee->network_free_list)) {
priv->config & CFG_STATIC_CHANNEL) {
/* Use oldest network if the free list is empty */
if (list_empty(&priv->ieee->network_free_list)) {
struct ieee80211_network *oldest = NULL;
struct ieee80211_network *target;
DECLARE_MAC_BUF(mac);
list_for_each_entry(target, &priv->ieee->network_list, list) {
if ((oldest == NULL) ||
(target->last_scanned < oldest->last_scanned))
oldest = target;
}
/* If there are no more slots, expire the oldest */
list_del(&oldest->list);
target = oldest;
IPW_DEBUG_ASSOC("Expired '%s' (%s) from "
"network list.\n",
escape_essid(target->ssid,
target->ssid_len),
print_mac(mac, target->bssid));
list_add_tail(&target->list,
&priv->ieee->network_free_list);
}
element = priv->ieee->network_free_list.next;
network = list_entry(element, struct ieee80211_network, list);
ipw_adhoc_create(priv, network);