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mac80211: What is get_sequence_counter?

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What is the get_sequence_counter callback for?

	/* For devices that have internal sequence counters, allow 802.11
	 * code to access the current value of a counter */
	int (*get_sequence_counter)(struct ieee80211_hw *hw,
				    u8* addr, u8 keyidx, u8 txrx,
				    u32* iv32, u16* iv16);

It doesn't seem to be used in current mac80211 code.
It seems that this is to fetch the current initial values.
Is that correct?
Who is supposed to use this callback? If it's unused, let's remove
it please. The documentation for it sucks anyway. :)

-- 
Greetings Michael.
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