If an iwi device is interrupted while scanning for an AP the scan lock is not removed. Drivers for if_iwn.c and if_wpi.c have accounted for this in the same manner. I believe if_ipw.c suffers from the same problem, but I don't have a machine to verify it.
This diff is for 4.8-stable, but the issue is still in -current. I am running it now, and things seem much more pleasant. Thanks! Index: if_iwi.c =================================================================== RCS file: /cvs/src/sys/dev/pci/if_iwi.c,v retrieving revision 1.105 diff -r1.105 if_iwi.c 2350a2351,2353 > /* In case we were scanning, release the scan "lock". */ > ic->ic_scan_lock = IEEE80211_SCAN_UNLOCKED;
