From 9116dd01120e249dc2e84e6edecd7ad7f828680f Mon Sep 17 00:00:00 2001
From: Johannes Berg <johannes@sipsolutions.net>
Date: Mon, 8 Sep 2008 17:47:23 +0200
Subject: [PATCH] mac80211: clarify scan request
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>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
---
net/mac80211/scan.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
diff --git a/net/mac80211/scan.c b/net/mac80211/scan.c
index 1beefb5ad6fb..9f6120150120 100644
--- a/net/mac80211/scan.c
+++ b/net/mac80211/scan.c
@@ -674,23 +674,32 @@ int ieee80211_sta_start_scan(struct ieee80211_sub_if_data *scan_sdata,
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;
}
--
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