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   1 From: Felix Fietkau <nbd@nbd.name>
   2 Date: Fri, 9 Feb 2018 19:46:54 +0100
   3 Subject: [PATCH] mac80211: round IEEE80211_TX_STATUS_HEADROOM up to multiple
   4  of 4
   5
   6 This ensures that mac80211 allocated management frames are properly
   7 aligned, which makes copying them more efficient.
   8 For instance, mt76 uses iowrite32_copy to copy beacon frames to beacon
   9 template memory on the chip.
  10 Misaligned 32-bit accesses cause CPU exceptions on MIPS and should be
  11 avoided.
  12
  13 Signed-off-by: Felix Fietkau <nbd@nbd.name>
  14 ---
  15
  16 --- a/include/net/mac80211.h
  17 +++ b/include/net/mac80211.h
  18 @@ -4149,7 +4149,7 @@ void ieee80211_sta_uapsd_trigger(struct
  19   * The TX headroom reserved by mac80211 for its own tx_status functions.
  20   * This is enough for the radiotap header.
  21   */
  22 -#define IEEE80211_TX_STATUS_HEADROOM   14
  23 +#define IEEE80211_TX_STATUS_HEADROOM   ALIGN(14, 4)
  24
  25  /**
  26   * ieee80211_sta_set_buffered - inform mac80211 about driver-buffered frames