From 1ddbbb0c83de82599b1baf14bf6bb69a774d4fc7 Mon Sep 17 00:00:00 2001
From: Johannes Berg <johannes.berg@intel.com>
Date: Wed, 4 Dec 2013 22:39:17 +0100
Subject: [PATCH] iwlwifi: mvm: use pre-RCU-sync sta removal operation

iwlmvm relies on the current mac80211 behaviour of allowing
station pointers to be valid for an RCU grace period after
returning from the sta_state() callback. To optimise these
cases, this behaviour is going away, so make the driver use
the new sta_pre_rcu_remove() method to clear the pointer in
the fw_id_to_mac_id[] array.

Since this may happen while the station is still present in
the firmware, don't set the pointer to NULL but to -ENOENT
to mark this particular case. In client mode, the station
is kept even longer (until marking the MAC as unassociated)
so the drain flow must take this new behavior into account.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
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