mac80211: avoid unnecessary beacon deref on CSA counter update
The beacon struct is already available in many contexts that are also already in an RCU read-locked section. Avoid that by using the existing beacon struct pointer directly. Signed-off-by: Wojciech Dubowik <Wojciech.Dubowik@neratec.com> [rewrite subject/add commit message] Signed-off-by: Johannes Berg <johannes.berg@intel.com>
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@ -3210,6 +3210,16 @@ static void ieee80211_set_csa(struct ieee80211_sub_if_data *sdata,
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rcu_read_unlock();
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}
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static u8 __ieee80211_csa_update_counter(struct beacon_data *beacon)
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{
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beacon->csa_current_counter--;
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/* the counter should never reach 0 */
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WARN_ON_ONCE(!beacon->csa_current_counter);
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return beacon->csa_current_counter;
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}
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u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif)
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{
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struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
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@ -3228,11 +3238,7 @@ u8 ieee80211_csa_update_counter(struct ieee80211_vif *vif)
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if (!beacon)
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goto unlock;
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beacon->csa_current_counter--;
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/* the counter should never reach 0 */
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WARN_ON_ONCE(!beacon->csa_current_counter);
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count = beacon->csa_current_counter;
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count = __ieee80211_csa_update_counter(beacon);
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unlock:
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rcu_read_unlock();
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@ -3332,7 +3338,7 @@ __ieee80211_beacon_get(struct ieee80211_hw *hw,
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if (beacon) {
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if (beacon->csa_counter_offsets[0]) {
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if (!is_template)
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ieee80211_csa_update_counter(vif);
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__ieee80211_csa_update_counter(beacon);
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ieee80211_set_csa(sdata, beacon);
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}
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@ -3378,7 +3384,7 @@ __ieee80211_beacon_get(struct ieee80211_hw *hw,
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if (beacon->csa_counter_offsets[0]) {
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if (!is_template)
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ieee80211_csa_update_counter(vif);
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__ieee80211_csa_update_counter(beacon);
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ieee80211_set_csa(sdata, beacon);
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}
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@ -3408,7 +3414,7 @@ __ieee80211_beacon_get(struct ieee80211_hw *hw,
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* for now we leave it consistent with overall
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* mac80211's behavior.
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*/
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ieee80211_csa_update_counter(vif);
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__ieee80211_csa_update_counter(beacon);
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ieee80211_set_csa(sdata, beacon);
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}
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