3823 static inline void ieee80211_rx_ni(struct ieee80211_hw *hw,
3824                                    struct sk_buff *skb)
3825 {
3826         local_bh_disable();
3827         ieee80211_rx(hw, skb);
3828         local_bh_enable();
3829 }

Why bottom halves on the local processor need to disabled, when 
ieee80211_rx is called. What is synchronization issue here?

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