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Add ieee80211_get_operstate() function to get the operstate of the netdevice. This is needed for drivers that need to know when the interface is IF_OPER_UP (e.g. wl12xx), and block notifiers can't be used (e.g. because the interface is already IF_OPER_UP, like after resuming from suspend) Signed-off-by: Eliad Peller <eliad@wizery.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>