From: Felix Fietkau Date: Wed, 14 Dec 2016 19:46:57 +0000 (+0100) Subject: mac80211: check for MCS in ieee80211_duration before fetching chanctx X-Git-Tag: v4.11-rc1~124^2~420^2~31 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=95cd470c75a8822d35fa82a1b276d47da37229d1;p=platform%2Fkernel%2Flinux-exynos.git 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 --- diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c index 058652d..4dea18b 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;