diff --git a/shared-core/radeon_ms.h b/shared-core/radeon_ms.h
index 66533837..903de97d 100644
--- a/shared-core/radeon_ms.h
+++ b/shared-core/radeon_ms.h
@@ -457,7 +457,7 @@ struct radeon_ms_i2c *radeon_ms_i2c_create(struct drm_device *dev,
 void radeon_ms_irq_emit(struct drm_device *dev);
 irqreturn_t radeon_ms_irq_handler(DRM_IRQ_ARGS);
 void radeon_ms_irq_preinstall(struct drm_device * dev);
-void radeon_ms_irq_postinstall(struct drm_device * dev);
+int radeon_ms_irq_postinstall(struct drm_device * dev);
 int radeon_ms_irq_init(struct drm_device *dev);
 void radeon_ms_irq_restore(struct drm_device *dev, struct radeon_state *state);
 void radeon_ms_irq_save(struct drm_device *dev, struct radeon_state *state);
diff --git a/shared-core/radeon_ms_bus.c b/shared-core/radeon_ms_bus.c
index d50c9fb8..ed8fb211 100644
--- a/shared-core/radeon_ms_bus.c
+++ b/shared-core/radeon_ms_bus.c
@@ -46,6 +46,7 @@ struct radeon_pcie_gart {
 	struct radeon_pcie      *pcie;
 	unsigned long           page_first;
 	struct page             **pages;
+	struct page             *dummy_read_page;
 	unsigned long           num_pages;
 	int                     populated;
 	int                     bound;
@@ -57,7 +58,8 @@ static void pcie_ttm_clear(struct drm_ttm_backend *backend);
 static void pcie_ttm_destroy(struct drm_ttm_backend *backend);
 static int pcie_ttm_needs_ub_cache_adjust(struct drm_ttm_backend *backend);
 static int pcie_ttm_populate(struct drm_ttm_backend *backend,
-			     unsigned long num_pages, struct page **pages);
+			     unsigned long num_pages, struct page **pages,
+			     struct page *dummy_read_page);
 static int pcie_ttm_unbind(struct drm_ttm_backend *backend);
 
 static struct drm_ttm_backend_func radeon_pcie_gart_ttm_backend = 
@@ -130,6 +132,10 @@ static int pcie_ttm_bind(struct drm_ttm_backend *backend,
 
         for (i = 0, page = page_first; i < pcie_gart->num_pages; i++, page++) {
 		struct page *cur_page = pcie_gart->pages[i];
+
+		if (!page) {
+			cur_page = pcie_gart->dummy_read_page;
+		}
                 /* write value */
 		page_base = page_to_phys(cur_page);
 		pcie_gart_set_page_base(pcie_gart->pcie, page, page_base);
@@ -173,7 +179,8 @@ static int pcie_ttm_needs_ub_cache_adjust(struct drm_ttm_backend *backend)
 }
 
 static int pcie_ttm_populate(struct drm_ttm_backend *backend,
-			     unsigned long num_pages, struct page **pages)
+			     unsigned long num_pages, struct page **pages,
+			     struct page *dummy_read_page)
 {
 	struct radeon_pcie_gart *pcie_gart;
 
diff --git a/shared-core/radeon_ms_irq.c b/shared-core/radeon_ms_irq.c
index 24182c75..2f94118f 100644
--- a/shared-core/radeon_ms_irq.c
+++ b/shared-core/radeon_ms_irq.c
@@ -115,9 +115,10 @@ void radeon_ms_irq_preinstall(struct drm_device * dev)
 	radeon_ack_irqs(dev_priv, mask);
 }
 
-void radeon_ms_irq_postinstall(struct drm_device * dev)
+int radeon_ms_irq_postinstall(struct drm_device * dev)
 {
 	radeon_ms_irq_enable(dev);
+	return 0;
 }
 
 int radeon_ms_irq_init(struct drm_device *dev)