mac80211: document RCU requirements for ieee80211_tx_dequeue()
In the iwlwifi conversion, we sometimes call this from outside of the wake_tx_queue() method, and in those cases must be in an RCU critical section. Document this requirement. Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: Luca Coelho <luciano.coelho@intel.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
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@ -6103,6 +6103,14 @@ void ieee80211_unreserve_tid(struct ieee80211_sta *sta, u8 tid);
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* @txq: pointer obtained from station or virtual interface
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*
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* Returns the skb if successful, %NULL if no frame was available.
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*
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* Note that this must be called in an rcu_read_lock() critical section,
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* which can only be released after the SKB was handled. Some pointers in
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* skb->cb, e.g. the key pointer, are protected by by RCU and thus the
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* critical section must persist not just for the duration of this call
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* but for the duration of the frame handling.
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* However, also note that while in the wake_tx_queue() method,
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* rcu_read_lock() is already held.
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*/
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struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw,
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struct ieee80211_txq *txq);
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