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When an interface is taken down while a scan is pending -- i.e. a scan request was accepted but not yet acted upon due to other work being in progress -- we currently do not properly cancel that scan and end up getting stuck. Fix this by doing better checks when an interface is taken down. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>