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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Felix Fietkau <nbd@nbd.name>,
        Johannes Berg <johannes.berg@intel.com>,
        Sasha Levin <alexander.levin@microsoft.com>
Subject: [PATCH 4.4 089/268] mac80211: round IEEE80211_TX_STATUS_HEADROOM up to multiple of 4
Date:   Mon, 28 May 2018 12:01:03 +0200
Message-Id: <20180528100212.269092817@linuxfoundation.org>
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4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Felix Fietkau <nbd@nbd.name>

[ Upstream commit 651b9920d7a694ffb1f885aef2bbb068a25d9d66 ]

This ensures that mac80211 allocated management frames are properly
aligned, which makes copying them more efficient.
For instance, mt76 uses iowrite32_copy to copy beacon frames to beacon
template memory on the chip.
Misaligned 32-bit accesses cause CPU exceptions on MIPS and should be
avoided.

Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 include/net/mac80211.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -3898,7 +3898,7 @@ static inline int ieee80211_sta_ps_trans
  * The TX headroom reserved by mac80211 for its own tx_status functions.
  * This is enough for the radiotap header.
  */
-#define IEEE80211_TX_STATUS_HEADROOM	14
+#define IEEE80211_TX_STATUS_HEADROOM	ALIGN(14, 4)
 
 /**
  * ieee80211_sta_set_buffered - inform mac80211 about driver-buffered frames