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mac80211: fix fast_tx header alignment

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The header field is defined as u8[] but also accessed as struct
ieee80211_hdr. Enforce an alignment of 2 to prevent unnecessary
unaligned accesses, which can be very harmful for performance on many
platforms.

Fixes: e495c24731 ("mac80211: extend fast-xmit for more ciphers")
Cc: [email protected]
Signed-off-by: Felix Fietkau <[email protected]>
Signed-off-by: Johannes Berg <[email protected]>
This commit is contained in:
Felix Fietkau 2016-05-19 17:34:38 +02:00 • committed by Johannes Berg
commit 6fe04128f1
1 changed files with 1 additions and 1 deletions
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2
net/mac80211/sta_info.h
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@ -280,7 +280,7 @@ struct ieee80211_fast_tx {
u8 sa_offs, da_offs, pn_offs;
u8 band;
u8 hdr[30 + 2 + IEEE80211_FAST_XMIT_MAX_IV +
sizeof(rfc1042_header)];
sizeof(rfc1042_header)] __aligned(2);
struct rcu_head rcu_head;
};