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35 lines
919 B
Diff
35 lines
919 B
Diff
From: Felix Fietkau <nbd@nbd.name>
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Date: Wed, 14 Dec 2016 20:12:25 +0100
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Subject: [PATCH] mac80211: check for MCS in ieee80211_duration before fetching
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chanctx
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Makes the code a bit more efficient
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Signed-off-by: Felix Fietkau <nbd@nbd.name>
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---
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--- a/net/mac80211/tx.c
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+++ b/net/mac80211/tx.c
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@@ -63,6 +63,10 @@ static __le16 ieee80211_duration(struct
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struct ieee80211_chanctx_conf *chanctx_conf;
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u32 rate_flags = 0;
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+ /* assume HW handles this */
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+ if (tx->rate.flags & (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS))
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+ return 0;
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+
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rcu_read_lock();
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chanctx_conf = rcu_dereference(tx->sdata->vif.chanctx_conf);
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if (chanctx_conf) {
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@@ -71,10 +75,6 @@ static __le16 ieee80211_duration(struct
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}
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rcu_read_unlock();
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- /* assume HW handles this */
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- if (tx->rate.flags & (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS))
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- return 0;
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-
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/* uh huh? */
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if (WARN_ON_ONCE(tx->rate.idx < 0))
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return 0;
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