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- From: Felix Fietkau <[email protected]>
- Date: Fri, 9 Feb 2018 19:46:54 +0100
- Subject: [PATCH] mac80211: round IEEE80211_TX_STATUS_HEADROOM up to multiple
- of 4
- 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 <[email protected]>
- ---
- --- a/include/net/mac80211.h
- +++ b/include/net/mac80211.h
- @@ -4145,7 +4145,7 @@ 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
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