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mac80211: round up tx status headroom

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Fixes unaligned access exceptions in mt76 when transmitting beacons

Signed-off-by: Felix Fietkau <nbd@nbd.name>
This commit is contained in:
Felix Fietkau 2018-02-10 13:26:42 +01:00
parent 8a59f9590e
commit 526921f20e
1 changed files with 26 additions and 0 deletions
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package/kernel/mac80211/patches/325-mac80211-round-IEEE80211_TX_STATUS_HEADROOM-up-to-mu.patch Normal file
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From: Felix Fietkau <nbd@nbd.name>
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 <nbd@nbd.name>
---
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -4149,7 +4149,7 @@ 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