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authorFelix Fietkau <nbd@nbd.name>2018-02-10 13:26:42 +0100
committerFelix Fietkau <nbd@nbd.name>2018-02-21 19:28:36 +0100
commit526921f20e9d40967d38b09c67d3247f4c6ddb39 (patch)
treec378d758599192448790b184d4979e97fed510c0 /package
parent8a59f9590e0b79f5ec6620a9e8534224e96db9a4 (diff)
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mac80211: round up tx status headroom
Fixes unaligned access exceptions in mt76 when transmitting beacons Signed-off-by: Felix Fietkau <nbd@nbd.name>
Diffstat (limited to 'package')
-rw-r--r--package/kernel/mac80211/patches/325-mac80211-round-IEEE80211_TX_STATUS_HEADROOM-up-to-mu.patch26
1 files changed, 26 insertions, 0 deletions
diff --git a/package/kernel/mac80211/patches/325-mac80211-round-IEEE80211_TX_STATUS_HEADROOM-up-to-mu.patch b/package/kernel/mac80211/patches/325-mac80211-round-IEEE80211_TX_STATUS_HEADROOM-up-to-mu.patch
new file mode 100644
index 0000000000..56c0acc099
--- /dev/null
+++ b/package/kernel/mac80211/patches/325-mac80211-round-IEEE80211_TX_STATUS_HEADROOM-up-to-mu.patch
@@ -0,0 +1,26 @@
+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