From 95cd470c75a8822d35fa82a1b276d47da37229d1 Mon Sep 17 00:00:00 2001 From: Felix Fietkau Date: Wed, 14 Dec 2016 20:46:57 +0100 Subject: [PATCH] mac80211: check for MCS in ieee80211_duration before fetching chanctx Makes the code a bit more efficient Signed-off-by: Felix Fietkau Signed-off-by: Johannes Berg --- net/mac80211/tx.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c index 058652d000d9..4dea18be385c 100644 --- a/net/mac80211/tx.c +++ b/net/mac80211/tx.c @@ -64,6 +64,10 @@ static __le16 ieee80211_duration(struct ieee80211_tx_data *tx, struct ieee80211_chanctx_conf *chanctx_conf; u32 rate_flags = 0; + /* assume HW handles this */ + if (tx->rate.flags & (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS)) + return 0; + rcu_read_lock(); chanctx_conf = rcu_dereference(tx->sdata->vif.chanctx_conf); if (chanctx_conf) { @@ -72,10 +76,6 @@ static __le16 ieee80211_duration(struct ieee80211_tx_data *tx, } rcu_read_unlock(); - /* assume HW handles this */ - if (tx->rate.flags & (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS)) - return 0; - /* uh huh? */ if (WARN_ON_ONCE(tx->rate.idx < 0)) return 0;