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mac80211: round IEEE80211_TX_STATUS_HEADROOM up to multiple of 4

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[ Upstream commit 651b9920d7 ]

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>
This commit is contained in:
Felix Fietkau
2018-02-10 13:20:34 +01:00
committed by Greg Kroah-Hartman
parent 50e54d5674
commit 3e1e6e1c2d
1 changed files with 1 additions and 1 deletions
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2
include/net/mac80211.h
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@@ -3898,7 +3898,7 @@ static inline int ieee80211_sta_ps_transition_ni(struct ieee80211_sta *sta,
* 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