From a980349725346ce7e3c1774e327c2f1fdca4593d Mon Sep 17 00:00:00 2001
From: Anton Blanchard <anton@samba.org>
Date: Sun, 24 Jun 2012 18:25:28 +0000
Subject: [PATCH] powerpc: Call dma_debug_add_bus for PCI and VIO buses

The DMA API debug code has hooks to verify all DMA entries have been
freed at time of hot unplug. We need to call dma_debug_add_bus for
this to work.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
---
 arch/powerpc/include/asm/vio.h |  2 ++
 arch/powerpc/kernel/dma.c      | 10 +++++++++-
 arch/powerpc/kernel/vio.c      |  4 +---
 3 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/arch/powerpc/include/asm/vio.h b/arch/powerpc/include/asm/vio.h
index b19adf751dd9..df81cb72d1e0 100644
--- a/arch/powerpc/include/asm/vio.h
+++ b/arch/powerpc/include/asm/vio.h
@@ -44,6 +44,8 @@
  */
 #define VIO_CMO_MIN_ENT 1562624
 
+extern struct bus_type vio_bus_type;
+
 struct iommu_table;
 
 /*
diff --git a/arch/powerpc/kernel/dma.c b/arch/powerpc/kernel/dma.c
index b1ec983dcec8..289be751cd75 100644
--- a/arch/powerpc/kernel/dma.c
+++ b/arch/powerpc/kernel/dma.c
@@ -11,6 +11,8 @@
 #include <linux/gfp.h>
 #include <linux/memblock.h>
 #include <linux/export.h>
+#include <linux/pci.h>
+#include <asm/vio.h>
 #include <asm/bug.h>
 #include <asm/abs_addr.h>
 #include <asm/machdep.h>
@@ -205,7 +207,13 @@ EXPORT_SYMBOL_GPL(dma_get_required_mask);
 
 static int __init dma_init(void)
 {
-       dma_debug_init(PREALLOC_DMA_DEBUG_ENTRIES);
+	dma_debug_init(PREALLOC_DMA_DEBUG_ENTRIES);
+#ifdef CONFIG_PCI
+	dma_debug_add_bus(&pci_bus_type);
+#endif
+#ifdef CONFIG_IBMVIO
+	dma_debug_add_bus(&vio_bus_type);
+#endif
 
        return 0;
 }
diff --git a/arch/powerpc/kernel/vio.c b/arch/powerpc/kernel/vio.c
index 3bb5be5da31c..7a421e8fe7ca 100644
--- a/arch/powerpc/kernel/vio.c
+++ b/arch/powerpc/kernel/vio.c
@@ -37,8 +37,6 @@
 #include <asm/page.h>
 #include <asm/hvcall.h>
 
-static struct bus_type vio_bus_type;
-
 static struct vio_dev vio_bus_device  = { /* fake "parent" device */
 	.name = "vio",
 	.type = "",
@@ -1580,7 +1578,7 @@ static int vio_hotplug(struct device *dev, struct kobj_uevent_env *env)
 	return 0;
 }
 
-static struct bus_type vio_bus_type = {
+struct bus_type vio_bus_type = {
 	.name = "vio",
 	.dev_attrs = vio_dev_attrs,
 	.uevent = vio_hotplug,
-- 
2.34.1