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mac80211: fix fast_tx header alignment

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commit 6fe04128f1 upstream.

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")
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Felix Fietkau
2016-05-19 17:34:38 +02:00
committed by Greg Kroah-Hartman
parent 35467dc763
commit 9dcbb4d9fd
1 changed files with 1 additions and 1 deletions
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2
net/mac80211/sta_info.h
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@@ -269,7 +269,7 @@ 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;
};