diff --git a/Documentation/DMA-API-HOWTO.txt b/Documentation/DMA-API-HOWTO.txt
index 1a721d0f35c8..0e98cf7466dd 100644
--- a/Documentation/DMA-API-HOWTO.txt
+++ b/Documentation/DMA-API-HOWTO.txt
@@ -365,13 +365,12 @@ __get_free_pages() (but takes size instead of a page order).  If your
 driver needs regions sized smaller than a page, you may prefer using
 the dma_pool interface, described below.
 
-The consistent DMA mapping interfaces, for non-NULL dev, will by
-default return a DMA address which is 32-bit addressable.  Even if the
-device indicates (via DMA mask) that it may address the upper 32-bits,
-consistent allocation will only return > 32-bit addresses for DMA if
-the consistent DMA mask has been explicitly changed via
-dma_set_coherent_mask().  This is true of the dma_pool interface as
-well.
+The consistent DMA mapping interfaces, will by default return a DMA address
+which is 32-bit addressable.  Even if the device indicates (via the DMA mask)
+that it may address the upper 32-bits, consistent allocation will only
+return > 32-bit addresses for DMA if the consistent DMA mask has been
+explicitly changed via dma_set_coherent_mask().  This is true of the
+dma_pool interface as well.
 
 dma_alloc_coherent() returns two values: the virtual address which you
 can use to access it from the CPU and dma_handle which you pass to the
diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
index 75e60be91e5f..6309a721394b 100644
--- a/include/linux/dma-mapping.h
+++ b/include/linux/dma-mapping.h
@@ -267,9 +267,9 @@ size_t dma_direct_max_mapping_size(struct device *dev);
 
 static inline const struct dma_map_ops *get_dma_ops(struct device *dev)
 {
-	if (dev && dev->dma_ops)
+	if (dev->dma_ops)
 		return dev->dma_ops;
-	return get_arch_dma_ops(dev ? dev->bus : NULL);
+	return get_arch_dma_ops(dev->bus);
 }
 
 static inline void set_dma_ops(struct device *dev,
@@ -650,7 +650,7 @@ static inline void dma_free_coherent(struct device *dev, size_t size,
 
 static inline u64 dma_get_mask(struct device *dev)
 {
-	if (dev && dev->dma_mask && *dev->dma_mask)
+	if (dev->dma_mask && *dev->dma_mask)
 		return *dev->dma_mask;
 	return DMA_BIT_MASK(32);
 }
diff --git a/kernel/dma/direct.c b/kernel/dma/direct.c
index fcdb23e8d2fc..2c2772e9702a 100644
--- a/kernel/dma/direct.c
+++ b/kernel/dma/direct.c
@@ -311,7 +311,7 @@ static inline bool dma_direct_possible(struct device *dev, dma_addr_t dma_addr,
 		size_t size)
 {
 	return swiotlb_force != SWIOTLB_FORCE &&
-		(!dev || dma_capable(dev, dma_addr, size));
+		dma_capable(dev, dma_addr, size);
 }
 
 dma_addr_t dma_direct_map_page(struct device *dev, struct page *page,