[PATCH] mac80211: don't allow scanning in monitor mode

zd1211rw gets confused when the user asks for a scan when the device is
in monitor mode. This patch tightens up the SIWSCAN handler to deny the scan
under these conditions.

Signed-off-by: Daniel Drake <dsd@gentoo.org>
Signed-off-by: Jiri Benc <jbenc@suse.cz>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 13 insertions, 6 deletions

diff --git a/net/mac80211/ieee80211_ioctl.c b/net/mac80211/ieee80211_ioctl.c
index d0e1ab5589db..e7904db55325 100644
--- a/net/mac80211/ieee80211_ioctl.c
+++ b/net/mac80211/ieee80211_ioctl.c
@@ -697,17 +697,24 @@ static int ieee80211_ioctl_siwscan(struct net_device *dev,
         if (!netif_running(dev))
                 return -ENETDOWN;
 
-        if (local->scan_flags & IEEE80211_SCAN_MATCH_SSID) {
-                if (sdata->type == IEEE80211_IF_TYPE_STA ||
-                    sdata->type == IEEE80211_IF_TYPE_IBSS) {
+        switch (sdata->type) {
+        case IEEE80211_IF_TYPE_STA:
+        case IEEE80211_IF_TYPE_IBSS:
+                if (local->scan_flags & IEEE80211_SCAN_MATCH_SSID) {
                         ssid = sdata->u.sta.ssid;
                         ssid_len = sdata->u.sta.ssid_len;
-                } else if (sdata->type == IEEE80211_IF_TYPE_AP) {
+                }
+                break;
+        case IEEE80211_IF_TYPE_AP:
+                if (local->scan_flags & IEEE80211_SCAN_MATCH_SSID) {
                         ssid = sdata->u.ap.ssid;
                         ssid_len = sdata->u.ap.ssid_len;
-                } else
-                        return -EINVAL;
+                }
+                break;
+        default:
+                return -EOPNOTSUPP;
         }
+
         return ieee80211_sta_req_scan(dev, ssid, ssid_len);
 }