diff --git a/debian/changelog b/debian/changelog
index d65cd94e8..69dc4ea30 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -3,6 +3,7 @@ linux (3.7.1-1~experimental.3) UNRELEASED; urgency=low
   [ Ben Hutchings ]
   * [ia64] nouveau: Disable another bit of ACPI support (fixes FTBFS)
   * [armhf/omap] Make OMAP_DMA built-in (fixes FTBFS)
+  * ath6kl: Do not use virt_addr_valid() (fixes FTBFS on mips,mipsel)
 
  -- Ben Hutchings <ben@decadent.org.uk>  Sun, 06 Jan 2013 04:39:12 +0000
 
diff --git a/debian/patches/bugfix/all/ath6kl-do-not-use-virt_addr_valid.patch b/debian/patches/bugfix/all/ath6kl-do-not-use-virt_addr_valid.patch
new file mode 100644
index 000000000..67adaa614
--- /dev/null
+++ b/debian/patches/bugfix/all/ath6kl-do-not-use-virt_addr_valid.patch
@@ -0,0 +1,87 @@
+From: Ben Hutchings <ben@decadent.org.uk>
+Subject: ath6kl: Do not use virt_addr_valid()
+Date: Sun, 06 Jan 2013 05:54:24 +0000
+
+virt_addr_valid() doesn't seem to be meant for drivers to use, and
+currently cannot be used from modules on MIPS:
+
+ERROR: "min_low_pfn" [drivers/net/wireless/ath/ath6kl/ath6kl_sdio.ko] undefined!
+
+Instead of trying to check the given pointer, split
+ath6kl_sdio_read_write_sync() into two functions:
+__ath6kl_sdio_read_write_sync() takes an explicit 'may_dma' parameter
+and ath6kl_sdio_read_write_sync() is a wrapper that passes false.
+Make __ath6kl_sdio_write_async() pass true since we know it always has
+a heap-allocated buffer and it's the one case where the performance
+benefit of DMA matters.
+
+--- a/drivers/net/wireless/ath/ath6kl/sdio.c
++++ b/drivers/net/wireless/ath/ath6kl/sdio.c
+@@ -79,17 +79,6 @@ static inline struct ath6kl_sdio *ath6kl
+ 	return ar->hif_priv;
+ }
+ 
+-/*
+- * Macro to check if DMA buffer is WORD-aligned and DMA-able.
+- * Most host controllers assume the buffer is DMA'able and will
+- * bug-check otherwise (i.e. buffers on the stack). virt_addr_valid
+- * check fails on stack memory.
+- */
+-static inline bool buf_needs_bounce(u8 *buf)
+-{
+-	return ((unsigned long) buf & 0x3) || !virt_addr_valid(buf);
+-}
+-
+ static void ath6kl_sdio_set_mbox_info(struct ath6kl *ar)
+ {
+ 	struct ath6kl_mbox_info *mbox_info = &ar->mbox_info;
+@@ -394,8 +383,8 @@ static int ath6kl_sdio_alloc_prep_scat_r
+ 	return 0;
+ }
+ 
+-static int ath6kl_sdio_read_write_sync(struct ath6kl *ar, u32 addr, u8 *buf,
+-				       u32 len, u32 request)
++static int __ath6kl_sdio_read_write_sync(struct ath6kl *ar, u32 addr, u8 *buf,
++					 u32 len, u32 request, bool may_dma)
+ {
+ 	struct ath6kl_sdio *ar_sdio = ath6kl_sdio_priv(ar);
+ 	u8  *tbuf = NULL;
+@@ -405,7 +394,10 @@ static int ath6kl_sdio_read_write_sync(s
+ 	if (request & HIF_BLOCK_BASIS)
+ 		len = round_down(len, HIF_MBOX_BLOCK_SIZE);
+ 
+-	if (buf_needs_bounce(buf)) {
++	/* Most host controllers assume the buffer is DMA'able. We
++	 * must use a bounce buffer if it isn't.
++	 */
++	if ((unsigned long) buf & 0x3 || !may_dma) {
+ 		if (!ar_sdio->dma_buffer)
+ 			return -ENOMEM;
+ 		mutex_lock(&ar_sdio->dma_buffer_mutex);
+@@ -428,6 +420,13 @@ static int ath6kl_sdio_read_write_sync(s
+ 	return ret;
+ }
+ 
++static int ath6kl_sdio_read_write_sync(struct ath6kl *ar, u32 addr, u8 *buf,
++				       u32 len, u32 request)
++{
++	return __ath6kl_sdio_read_write_sync(ar, addr, buf, len, request,
++					     false);
++}
++
+ static void __ath6kl_sdio_write_async(struct ath6kl_sdio *ar_sdio,
+ 				      struct bus_request *req)
+ {
+@@ -437,9 +436,9 @@ static void __ath6kl_sdio_write_async(st
+ 		void *context;
+ 		int status;
+ 
+-		status = ath6kl_sdio_read_write_sync(ar_sdio->ar, req->address,
+-						     req->buffer, req->length,
+-						     req->request);
++		status = __ath6kl_sdio_read_write_sync(
++			ar_sdio->ar, req->address, req->buffer, req->length,
++			req->request, true);
+ 		context = req->packet;
+ 		ath6kl_sdio_free_bus_req(ar_sdio, req);
+ 		ath6kl_hif_rw_comp_handler(context, status);
diff --git a/debian/patches/series b/debian/patches/series
index f7798db67..993efb754 100644
--- a/debian/patches/series
+++ b/debian/patches/series
@@ -69,3 +69,4 @@ debian/udl-disable-autoload.patch
 debian/ast-disable-autoload.patch
 debian/mgag200-disable-autoload.patch
 clean-modules-without-link-vmlinux.sh.patch
+bugfix/all/ath6kl-do-not-use-virt_addr_valid.patch