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- From: Felix Fietkau <nbd@nbd.name>
- Date: Thu, 19 May 2016 17:32:13 +0200
- Subject: [PATCH] mac80211: fix fast_tx header alignment
- 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: e495c24731a2 ("mac80211: extend fast-xmit for more ciphers")
- Cc: stable@vger.kernel.org
- Signed-off-by: Felix Fietkau <nbd@nbd.name>
- ---
- --- a/net/mac80211/sta_info.h
- +++ b/net/mac80211/sta_info.h
- @@ -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;
- };
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