[PATCH 9/8] mac80211: clarify scan request

Johannes Berg
2008-09-08T15:47:27Z

When a scan is requested for non-STA interfaces, we simply fire
off a scan, but for STA interfaces we shouldn't because they
could be in the middle of an association. This clarifies the
corresponding code.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
---
net/mac80211/scan.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)

--- everything.orig/net/mac80211/scan.c 2008-09-08 17:01:21.000000000 +0200
+++ everything/net/mac80211/scan.c 2008-09-08 17:23:59.000000000 +0200
@@ -674,23 +674,32 @@ int ieee80211_sta_start_scan(struct ieee

int ieee80211_sta_req_scan(struct ieee80211_sub_if_data *sdata, u8 *ssid, size_t ssid_len)
{
- struct ieee80211_if_sta *ifsta = &sdata->u.sta;
struct ieee80211_local *local = sdata->local;
+ struct ieee80211_if_sta *ifsta;

if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
return ieee80211_sta_start_scan(sdata, ssid, ssid_len);

+ /*
+ * STA has a state machine that might need to defer scanning
+ * while it's trying to associate/authenticate, therefore we
+ * queue it up to the state machine in that case.
+ */
+
if (local->sta_sw_scanning || local->sta_hw_scanning) {
if (local->scan_sdata == sdata)
return 0;
return -EBUSY;
}

+ ifsta = &sdata->u.sta;
+
ifsta->scan_ssid_len = ssid_len;
if (ssid_len)
memcpy(ifsta->scan_ssid, ssid, ssid_len);
set_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request);
queue_work(local->hw.workqueue, &ifsta->work);
+
return 0;
}