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| /freebsd-11-stable/sys/net80211/ | ||
| H A D | ieee80211_scan_sta.c | diff 275875 Thu Dec 18 03:19:21 MST 2014 adrian Fix the scan handling for 11b->11g upgrades in a world where, well, it's not just 11b/11g. The following was happening, and it's quite .. annoyingly grr-y. * create vap, setup wpa_supplicant with no bgscanning, etc - there's no call to ieee80211_media_change, so vap->iv_des_mode is IEEE80211_MODE_AUTO; * do ifconfig wlan0 scan - same thing, media_change doesn't get called, iv_des_mode stays as auto. * But then, run wpa_cli and do 'scan' - it'll do a media change. * if you're on 11ng, vap->iv_des_mode gets changed to IEEE80211_MODE_11NG * Then makescanlist() is called. There's a block of code that gets called if iv_des_mode != IEEE80211_MODE_AUTO, and it does this: if (vap->iv_des_mode != IEEE80211_MODE_11G || mode != IEEE80211_MODE_11B) continue; mode = IEEE80211_MODE_11G; /* upgrade */ * .. now, iv_des_mode is not IEEE80211_MODE_11G, so it always runs 'continue' * .. and thus the scan list stays empty and no further channel scans occur. Ever.(1) If you then disassociate and try associating to something, your scan table has likely been purged / aged out and you'll never see anything in the scan list. (1) You need to do 'ifconfig wlan0 mode auto' or just destroy/re-create the VAP to get working wireless again. Tested: * iwn(4) - intel 5300 wifi; STA mode; using wpa_supplicant; bgscan enabled -and- wpa_supplicant scanning. Thanks to: * Everyone who kept poking me about this and wondering why the hell their wifi would eventually stop seeing scan lists. Grr. I eventually snapped this evening and dug back into this code. |
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