• Johannes Berg's avatar
    mac80211: fix scan races and rework scanning · f3b85252
    Johannes Berg authored
    
    
    There are some places marked
    	/* XXX maybe racy? */
    and they really are racy because there's no locking.
    
    This patch reworks much of the scan code, and introduces proper
    locking for the scan request as well as the internal scanning
    (which is necessary for IBSS/managed modes). Helper functions
    are added to call the scanning code whenever necessary. The
    scan deferring is changed to simply queue the scanning work
    instead of trying to start the scan in place, the scanning work
    will then take care of the rest.
    
    Also, currently when internal scans are requested for an interface
    that is trying to associate, we reject such scans. This was not
    intended, the mlme code has provisions to scan twice when it can't
    find the BSS to associate with right away; this has never worked
    properly. Fix this by not rejecting internal scan requests for an
    interface that is associating.
    Signed-off-by: default avatarJohannes Berg <johannes@sipsolutions.net>
    Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
    f3b85252
ieee80211_i.h 33 KB