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mac80211: fix unaligned accesses in the tx path

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Signed-off-by: Felix Fietkau <nbd@nbd.name>
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Felix Fietkau 2016-05-19 17:35:49 +02:00
parent 3bc90f9626
commit 24270e9493
1 changed files with 25 additions and 0 deletions
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package/kernel/mac80211/patches/304-mac80211-fix-fast_tx-header-alignment.patch Normal file
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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;
};