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mac80211: Retry probe request few times 

Retry 5 times  (chosen arbitary ), before assuming
that station is out of range.

Fixes frequent disassociations while connected to weak,
and sometimes even strong access points.

Signed-off-by: Maxim Levitky <maximlevitsky@gmail.com>
Acked-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Maxim Levitsky 2009-07-31 18:54:12 +03:00 committed by John W. Linville
parent 75e6c3b72b
commit a43abf2939
2 changed files with 31 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
net/mac80211/ieee80211_i.h
View File

@ -280,6 +280,7 @@ struct ieee80211_if_managed {
struct work_struct beacon_loss_work;
unsigned long probe_timeout;
int probe_send_count;
struct mutex mtx;
struct ieee80211_bss *associated;

42
net/mac80211/mlme.c
View File

@ -31,6 +31,7 @@
#define IEEE80211_AUTH_MAX_TRIES 3
#define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
#define IEEE80211_ASSOC_MAX_TRIES 3
#define IEEE80211_MAX_PROBE_TRIES 5
/*
* beacon loss detection timeout
@ -1153,11 +1154,24 @@ void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
}
static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
const u8 *ssid;
ssid = ieee80211_bss_get_ie(&ifmgd->associated->cbss, WLAN_EID_SSID);
ieee80211_send_probe_req(sdata, ifmgd->associated->cbss.bssid,
ssid + 2, ssid[1], NULL, 0);
ifmgd->probe_send_count++;
ifmgd->probe_timeout = jiffies + IEEE80211_PROBE_WAIT;
run_again(ifmgd, ifmgd->probe_timeout);
}
static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
bool beacon)
{
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
const u8 *ssid;
bool already = false;
if (!netif_running(sdata->dev))
@ -1200,18 +1214,12 @@ static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
if (already)
goto out;
ifmgd->probe_timeout = jiffies + IEEE80211_PROBE_WAIT;
mutex_lock(&sdata->local->iflist_mtx);
ieee80211_recalc_ps(sdata->local, -1);
mutex_unlock(&sdata->local->iflist_mtx);
ssid = ieee80211_bss_get_ie(&ifmgd->associated->cbss, WLAN_EID_SSID);
ieee80211_send_probe_req(sdata, ifmgd->associated->cbss.bssid,
ssid + 2, ssid[1], NULL, 0);
run_again(ifmgd, ifmgd->probe_timeout);
ifmgd->probe_send_count = 0;
ieee80211_mgd_probe_ap_send(sdata);
out:
mutex_unlock(&ifmgd->mtx);
}
@ -2064,17 +2072,27 @@ static void ieee80211_sta_work(struct work_struct *work)
if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
IEEE80211_STA_CONNECTION_POLL) &&
ifmgd->associated) {
u8 bssid[ETH_ALEN];
memcpy(bssid, ifmgd->associated->cbss.bssid, ETH_ALEN);
if (time_is_after_jiffies(ifmgd->probe_timeout))
run_again(ifmgd, ifmgd->probe_timeout);
else {
u8 bssid[ETH_ALEN];
else if (ifmgd->probe_send_count < IEEE80211_MAX_PROBE_TRIES) {
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
printk(KERN_DEBUG "No probe response from AP %pM"
" after %dms, try %d\n", bssid,
(1000 * IEEE80211_PROBE_WAIT)/HZ,
ifmgd->probe_send_count);
#endif
ieee80211_mgd_probe_ap_send(sdata);
} else {
/*
* We actually lost the connection ... or did we?
* Let's make sure!
*/
ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
IEEE80211_STA_BEACON_POLL);
memcpy(bssid, ifmgd->associated->cbss.bssid, ETH_ALEN);
printk(KERN_DEBUG "No probe response from AP %pM"
" after %dms, disconnecting.\n",
bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ);