diff --git a/package/mac80211/patches/0170-dma_set_coherent_mask.patch b/package/mac80211/patches/0170-dma_set_coherent_mask.patch
new file mode 100644
index 000000000..9bafbeb87
--- /dev/null
+++ b/package/mac80211/patches/0170-dma_set_coherent_mask.patch
@@ -0,0 +1,28 @@
+From 3c02b107ec11e14ef21e7a444ad83f0ef1e68f79 Mon Sep 17 00:00:00 2001
+From: Hauke Mehrtens <hauke@hauke-m.de>
+Date: Sun, 13 Jun 2010 20:41:55 +0200
+Subject: [PATCH 1/2] compat: backport dma_set_coherent_mask
+
+
+Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
+---
+ include/linux/compat-2.6.34.h |    8 ++++++++
+ 1 files changed, 8 insertions(+), 0 deletions(-)
+
+--- a/include/linux/compat-2.6.34.h
++++ b/include/linux/compat-2.6.34.h
+@@ -216,6 +216,14 @@ do {							\
+ #define dma_unmap_len_set(PTR, LEN_NAME, VAL)    do { } while (0)
+ #endif
+ 
++static inline int dma_set_coherent_mask(struct device *dev, u64 mask)
++{
++	if (!dma_supported(dev, mask))
++		return -EIO;
++	dev->coherent_dma_mask = mask;
++	return 0;
++}
++
+ #endif /* (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,34)) */
+ 
+ #endif /* LINUX_26_34_COMPAT_H */