From 651b9920d7a694ffb1f885aef2bbb068a25d9d66 Mon Sep 17 00:00:00 2001
From: Felix Fietkau <nbd@nbd.name>
Date: Sat, 10 Feb 2018 13:20:34 +0100
Subject: [PATCH] mac80211: round IEEE80211_TX_STATUS_HEADROOM up to multiple of 4
Git-commit: 651b9920d7a694ffb1f885aef2bbb068a25d9d66
Patch-mainline: v4.16-rc3
References: bsc#1051510
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>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
include/net/mac80211.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -4141,7 +4141,7 @@ void ieee80211_sta_uapsd_trigger(struct
* 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