2018-02-10 12:26:42 +00:00
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From: Felix Fietkau <nbd@nbd.name>
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Date: Fri, 9 Feb 2018 19:46:54 +0100
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Subject: [PATCH] mac80211: round IEEE80211_TX_STATUS_HEADROOM up to multiple
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of 4
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This ensures that mac80211 allocated management frames are properly
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aligned, which makes copying them more efficient.
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For instance, mt76 uses iowrite32_copy to copy beacon frames to beacon
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template memory on the chip.
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Misaligned 32-bit accesses cause CPU exceptions on MIPS and should be
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avoided.
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Signed-off-by: Felix Fietkau <nbd@nbd.name>
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---
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--- a/include/net/mac80211.h
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+++ b/include/net/mac80211.h
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2018-03-01 13:46:34 +00:00
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@@ -4145,7 +4145,7 @@ void ieee80211_sta_uapsd_trigger(struct
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2018-02-10 12:26:42 +00:00
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* The TX headroom reserved by mac80211 for its own tx_status functions.
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* This is enough for the radiotap header.
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*/
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-#define IEEE80211_TX_STATUS_HEADROOM 14
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+#define IEEE80211_TX_STATUS_HEADROOM ALIGN(14, 4)
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/**
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* ieee80211_sta_set_buffered - inform mac80211 about driver-buffered frames
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