diff --git a/arch/alpha/include/asm/dma-mapping.h b/arch/alpha/include/asm/dma-mapping.h
index d3480562411df5451d64e41b5fa05a96851a1ee8..5d53666935e6bacf733bb4c03d46c1c241618ff0 100644
--- a/arch/alpha/include/asm/dma-mapping.h
+++ b/arch/alpha/include/asm/dma-mapping.h
@@ -3,7 +3,7 @@
 
 extern const struct dma_map_ops *dma_ops;
 
-static inline const struct dma_map_ops *get_dma_ops(struct device *dev)
+static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
 {
 	return dma_ops;
 }
diff --git a/arch/arc/include/asm/dma-mapping.h b/arch/arc/include/asm/dma-mapping.h
index fdff3aa60052b22b60c488ce90fad52773c43f71..94285031c4fb4c516649d658bfa1ba4cbdb7b1ac 100644
--- a/arch/arc/include/asm/dma-mapping.h
+++ b/arch/arc/include/asm/dma-mapping.h
@@ -20,7 +20,7 @@
 
 extern const struct dma_map_ops arc_dma_ops;
 
-static inline const struct dma_map_ops *get_dma_ops(struct device *dev)
+static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
 {
 	return &arc_dma_ops;
 }
diff --git a/arch/arm/include/asm/dma-mapping.h b/arch/arm/include/asm/dma-mapping.h
index c7432d647e53d30c0d41851f4738c2e09d98191b..71665692597541538c1c04e4475b4d718191cbc3 100644
--- a/arch/arm/include/asm/dma-mapping.h
+++ b/arch/arm/include/asm/dma-mapping.h
@@ -23,12 +23,12 @@ static inline const struct dma_map_ops *__generic_dma_ops(struct device *dev)
 	return &arm_dma_ops;
 }
 
-static inline const struct dma_map_ops *get_dma_ops(struct device *dev)
+static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
 {
 	if (xen_initial_domain())
 		return xen_dma_ops;
 	else
-		return __generic_dma_ops(dev);
+		return __generic_dma_ops(NULL);
 }
 
 #define HAVE_ARCH_DMA_SUPPORTED 1
diff --git a/arch/arm64/include/asm/dma-mapping.h b/arch/arm64/include/asm/dma-mapping.h
index 58ae36cc3b60c454588b7fe60375f57b4559427e..505756cdc67a1deba4ff49491392f95a8290af57 100644
--- a/arch/arm64/include/asm/dma-mapping.h
+++ b/arch/arm64/include/asm/dma-mapping.h
@@ -39,12 +39,12 @@ static inline const struct dma_map_ops *__generic_dma_ops(struct device *dev)
 	return &dummy_dma_ops;
 }
 
-static inline const struct dma_map_ops *get_dma_ops(struct device *dev)
+static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
 {
 	if (xen_initial_domain())
 		return xen_dma_ops;
 	else
-		return __generic_dma_ops(dev);
+		return __generic_dma_ops(NULL);
 }
 
 void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
diff --git a/arch/avr32/include/asm/dma-mapping.h b/arch/avr32/include/asm/dma-mapping.h
index b2b43c0e0774b55eecc971271bb43e42c6da2bb0..7388451f9905004f6bca38e8064562dcc47c4926 100644
--- a/arch/avr32/include/asm/dma-mapping.h
+++ b/arch/avr32/include/asm/dma-mapping.h
@@ -6,7 +6,7 @@ extern void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
 
 extern const struct dma_map_ops avr32_dma_ops;
 
-static inline const struct dma_map_ops *get_dma_ops(struct device *dev)
+static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
 {
 	return &avr32_dma_ops;
 }
diff --git a/arch/blackfin/include/asm/dma-mapping.h b/arch/blackfin/include/asm/dma-mapping.h
index 320fb50fbd4130f40a4001f7f0d729320975ee48..04254ac36bed1dd3897c316c07c8c924ab08faca 100644
--- a/arch/blackfin/include/asm/dma-mapping.h
+++ b/arch/blackfin/include/asm/dma-mapping.h
@@ -38,7 +38,7 @@ _dma_sync(dma_addr_t addr, size_t size, enum dma_data_direction dir)
 
 extern const struct dma_map_ops bfin_dma_ops;
 
-static inline const struct dma_map_ops *get_dma_ops(struct device *dev)
+static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
 {
 	return &bfin_dma_ops;
 }
diff --git a/arch/c6x/include/asm/dma-mapping.h b/arch/c6x/include/asm/dma-mapping.h
index 88258b9ebc8e9c2211d80bd80d32c70f17c72aa6..aca9f755e4f8e6564088069eeeafd62e8c9ff8dd 100644
--- a/arch/c6x/include/asm/dma-mapping.h
+++ b/arch/c6x/include/asm/dma-mapping.h
@@ -19,7 +19,7 @@
 
 extern const struct dma_map_ops c6x_dma_ops;
 
-static inline const struct dma_map_ops *get_dma_ops(struct device *dev)
+static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
 {
 	return &c6x_dma_ops;
 }
diff --git a/arch/cris/include/asm/dma-mapping.h b/arch/cris/include/asm/dma-mapping.h
index aae4fbc0a65642b889107eb33f39717611631ead..256169de3743defd576df3e5f119359e228a991a 100644
--- a/arch/cris/include/asm/dma-mapping.h
+++ b/arch/cris/include/asm/dma-mapping.h
@@ -4,12 +4,12 @@
 #ifdef CONFIG_PCI
 extern const struct dma_map_ops v32_dma_ops;
 
-static inline const struct dma_map_ops *get_dma_ops(struct device *dev)
+static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
 {
 	return &v32_dma_ops;
 }
 #else
-static inline const struct dma_map_ops *get_dma_ops(struct device *dev)
+static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
 {
 	BUG();
 	return NULL;
diff --git a/arch/frv/include/asm/dma-mapping.h b/arch/frv/include/asm/dma-mapping.h
index 150cc00544a81ad7759b646a395e38973c1cbf89..354900917585a220fe840aecb4b2a081616f6d42 100644
--- a/arch/frv/include/asm/dma-mapping.h
+++ b/arch/frv/include/asm/dma-mapping.h
@@ -9,7 +9,7 @@ extern unsigned long __nongprelbss dma_coherent_mem_end;
 
 extern const struct dma_map_ops frv_dma_ops;
 
-static inline const struct dma_map_ops *get_dma_ops(struct device *dev)
+static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
 {
 	return &frv_dma_ops;
 }
diff --git a/arch/h8300/include/asm/dma-mapping.h b/arch/h8300/include/asm/dma-mapping.h
index f804bca4c13fe7d18e4f289d41b2d3d4dc68eb01..847c7562e04607c19324ad7c8f720dcf8c9e4503 100644
--- a/arch/h8300/include/asm/dma-mapping.h
+++ b/arch/h8300/include/asm/dma-mapping.h
@@ -3,7 +3,7 @@
 
 extern const struct dma_map_ops h8300_dma_map_ops;
 
-static inline const struct dma_map_ops *get_dma_ops(struct device *dev)
+static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
 {
 	return &h8300_dma_map_ops;
 }
diff --git a/arch/hexagon/include/asm/dma-mapping.h b/arch/hexagon/include/asm/dma-mapping.h
index b812e917cd95925f552b1bef328c67747fd5b01a..d3a87bd9b68655bcf564b8a6ac85c754b9a76045 100644
--- a/arch/hexagon/include/asm/dma-mapping.h
+++ b/arch/hexagon/include/asm/dma-mapping.h
@@ -34,11 +34,8 @@ extern int bad_dma_address;
 
 extern const struct dma_map_ops *dma_ops;
 
-static inline const struct dma_map_ops *get_dma_ops(struct device *dev)
+static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
 {
-	if (unlikely(dev == NULL))
-		return NULL;
-
 	return dma_ops;
 }
 
diff --git a/arch/ia64/include/asm/dma-mapping.h b/arch/ia64/include/asm/dma-mapping.h
index 05e467d56d8615954ffef12aa49eabe12f64b618..73ec3c6f4cfe6869d9935d4f45bec063146d66e4 100644
--- a/arch/ia64/include/asm/dma-mapping.h
+++ b/arch/ia64/include/asm/dma-mapping.h
@@ -23,7 +23,10 @@ extern void machvec_dma_sync_single(struct device *, dma_addr_t, size_t,
 extern void machvec_dma_sync_sg(struct device *, struct scatterlist *, int,
 				enum dma_data_direction);
 
-#define get_dma_ops(dev) platform_dma_get_ops(dev)
+static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
+{
+	return platform_dma_get_ops(NULL);
+}
 
 static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
 {
diff --git a/arch/m32r/include/asm/dma-mapping.h b/arch/m32r/include/asm/dma-mapping.h
index 27b1597ac5633ebf48fcbb41f4778749850fd0a9..c01d9f52d22875a9f4469c0da2addc3ebeff5418 100644
--- a/arch/m32r/include/asm/dma-mapping.h
+++ b/arch/m32r/include/asm/dma-mapping.h
@@ -10,10 +10,8 @@
 
 #define DMA_ERROR_CODE (~(dma_addr_t)0x0)
 
-static inline const struct dma_map_ops *get_dma_ops(struct device *dev)
+static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
 {
-	if (dev && dev->dma_ops)
-		return dev->dma_ops;
 	return &dma_noop_ops;
 }
 
diff --git a/arch/m68k/include/asm/dma-mapping.h b/arch/m68k/include/asm/dma-mapping.h
index 863509939d5a2a2c562e6f83a74391a304740d17..9210e470771bd43e5a7be7a8df08f9c05487713b 100644
--- a/arch/m68k/include/asm/dma-mapping.h
+++ b/arch/m68k/include/asm/dma-mapping.h
@@ -3,7 +3,7 @@
 
 extern const struct dma_map_ops m68k_dma_ops;
 
-static inline const struct dma_map_ops *get_dma_ops(struct device *dev)
+static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
 {
         return &m68k_dma_ops;
 }
diff --git a/arch/metag/include/asm/dma-mapping.h b/arch/metag/include/asm/dma-mapping.h
index c156a7ac732f44c21d24379f4e473142875a8c52..fad3dc3cb21008c59d612827c40282fae34d1827 100644
--- a/arch/metag/include/asm/dma-mapping.h
+++ b/arch/metag/include/asm/dma-mapping.h
@@ -3,7 +3,7 @@
 
 extern const struct dma_map_ops metag_dma_ops;
 
-static inline const struct dma_map_ops *get_dma_ops(struct device *dev)
+static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
 {
 	return &metag_dma_ops;
 }
diff --git a/arch/microblaze/include/asm/dma-mapping.h b/arch/microblaze/include/asm/dma-mapping.h
index c7faf2fb51d639d09774629c96d7c77aeabbba57..3fad5e722a6690b43ddae12092dfc53f73e52501 100644
--- a/arch/microblaze/include/asm/dma-mapping.h
+++ b/arch/microblaze/include/asm/dma-mapping.h
@@ -38,7 +38,7 @@
  */
 extern const struct dma_map_ops dma_direct_ops;
 
-static inline const struct dma_map_ops *get_dma_ops(struct device *dev)
+static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
 {
 	return &dma_direct_ops;
 }
diff --git a/arch/mips/include/asm/dma-mapping.h b/arch/mips/include/asm/dma-mapping.h
index dad3b09fe993453e649cbcc38f29f4f5a171f2d3..aba71385f9d15afcbdd82262df9b905c69ef9c22 100644
--- a/arch/mips/include/asm/dma-mapping.h
+++ b/arch/mips/include/asm/dma-mapping.h
@@ -11,12 +11,9 @@
 
 extern const struct dma_map_ops *mips_dma_map_ops;
 
-static inline const struct dma_map_ops *get_dma_ops(struct device *dev)
+static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
 {
-	if (dev && dev->dma_ops)
-		return dev->dma_ops;
-	else
-		return mips_dma_map_ops;
+	return mips_dma_map_ops;
 }
 
 static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
diff --git a/arch/mn10300/include/asm/dma-mapping.h b/arch/mn10300/include/asm/dma-mapping.h
index 564e3927e005da544921e89a32e50281306ae795..737ef574b3eae5faf0e59970a7427f8138b65a40 100644
--- a/arch/mn10300/include/asm/dma-mapping.h
+++ b/arch/mn10300/include/asm/dma-mapping.h
@@ -16,7 +16,7 @@
 
 extern const struct dma_map_ops mn10300_dma_ops;
 
-static inline const struct dma_map_ops *get_dma_ops(struct device *dev)
+static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
 {
 	return &mn10300_dma_ops;
 }
diff --git a/arch/nios2/include/asm/dma-mapping.h b/arch/nios2/include/asm/dma-mapping.h
index aa00d839a64be7deaee27faa722a15a892490e91..7b3c6f280293aeb5cdd13b1de341f0e74f36bf2d 100644
--- a/arch/nios2/include/asm/dma-mapping.h
+++ b/arch/nios2/include/asm/dma-mapping.h
@@ -12,7 +12,7 @@
 
 extern const struct dma_map_ops nios2_dma_ops;
 
-static inline const struct dma_map_ops *get_dma_ops(struct device *dev)
+static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
 {
 	return &nios2_dma_ops;
 }
diff --git a/arch/openrisc/include/asm/dma-mapping.h b/arch/openrisc/include/asm/dma-mapping.h
index 88acbedb494777ac837b1f58e86b7987f715000a..0c0075f17145f526ec2e4abff84b45b83c4acf84 100644
--- a/arch/openrisc/include/asm/dma-mapping.h
+++ b/arch/openrisc/include/asm/dma-mapping.h
@@ -30,7 +30,7 @@
 
 extern const struct dma_map_ops or1k_dma_map_ops;
 
-static inline const struct dma_map_ops *get_dma_ops(struct device *dev)
+static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
 {
 	return &or1k_dma_map_ops;
 }
diff --git a/arch/parisc/include/asm/dma-mapping.h b/arch/parisc/include/asm/dma-mapping.h
index 1749073e44fc96bb0fab82d164d9fed1fd2378a1..5404c6a726b227f57024afec81bbd199d567c810 100644
--- a/arch/parisc/include/asm/dma-mapping.h
+++ b/arch/parisc/include/asm/dma-mapping.h
@@ -27,7 +27,7 @@ extern const struct dma_map_ops pcx_dma_ops;
 
 extern const struct dma_map_ops *hppa_dma_ops;
 
-static inline const struct dma_map_ops *get_dma_ops(struct device *dev)
+static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
 {
 	return hppa_dma_ops;
 }
diff --git a/arch/powerpc/include/asm/dma-mapping.h b/arch/powerpc/include/asm/dma-mapping.h
index 8275603ba4d548c832ea3fe953cacfe9857a694c..181a095468e444a4c0637377c29d962ded2ba91b 100644
--- a/arch/powerpc/include/asm/dma-mapping.h
+++ b/arch/powerpc/include/asm/dma-mapping.h
@@ -78,17 +78,14 @@ extern struct dma_map_ops dma_iommu_ops;
 #endif
 extern const struct dma_map_ops dma_direct_ops;
 
-static inline const struct dma_map_ops *get_dma_ops(struct device *dev)
+static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
 {
 	/* We don't handle the NULL dev case for ISA for now. We could
 	 * do it via an out of line call but it is not needed for now. The
 	 * only ISA DMA device we support is the floppy and we have a hack
 	 * in the floppy driver directly to get a device for us.
 	 */
-	if (unlikely(dev == NULL))
-		return NULL;
-
-	return dev->dma_ops;
+	return NULL;
 }
 
 /*
diff --git a/arch/powerpc/include/asm/ps3.h b/arch/powerpc/include/asm/ps3.h
index a19f831a4cc9acdc6b0974e1d84240646983b0a6..17ee719e799fa470171b33f901b1b18bfffcffc2 100644
--- a/arch/powerpc/include/asm/ps3.h
+++ b/arch/powerpc/include/asm/ps3.h
@@ -435,7 +435,7 @@ static inline void *ps3_system_bus_get_drvdata(
 	return dev_get_drvdata(&dev->core);
 }
 
-/* These two need global scope for get_dma_ops(). */
+/* These two need global scope for get_arch_dma_ops(). */
 
 extern struct bus_type ps3_system_bus_type;
 
diff --git a/arch/s390/include/asm/dma-mapping.h b/arch/s390/include/asm/dma-mapping.h
index a872027d0c1b55ffc72a7a6b267cb71066ac6cd8..3108b8dbe266a52c145f7b03fd5ad9ece5bb83b2 100644
--- a/arch/s390/include/asm/dma-mapping.h
+++ b/arch/s390/include/asm/dma-mapping.h
@@ -12,10 +12,8 @@
 
 extern const struct dma_map_ops s390_pci_dma_ops;
 
-static inline const struct dma_map_ops *get_dma_ops(struct device *dev)
+static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
 {
-	if (dev && dev->dma_ops)
-		return dev->dma_ops;
 	return &dma_noop_ops;
 }
 
diff --git a/arch/sh/include/asm/dma-mapping.h b/arch/sh/include/asm/dma-mapping.h
index a7382c34c241d7e51cc5fd3f2330c37f4148712e..d99008af5f73bde118fb7b513d7315c4bd80d7b4 100644
--- a/arch/sh/include/asm/dma-mapping.h
+++ b/arch/sh/include/asm/dma-mapping.h
@@ -4,7 +4,7 @@
 extern const struct dma_map_ops *dma_ops;
 extern void no_iommu_init(void);
 
-static inline const struct dma_map_ops *get_dma_ops(struct device *dev)
+static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
 {
 	return dma_ops;
 }
diff --git a/arch/sparc/include/asm/dma-mapping.h b/arch/sparc/include/asm/dma-mapping.h
index 3d2babc0c4c6ce2e9eb482c7a1f094536424f9cc..69cc627779f25ffa5c01f226f65adcd29be8a193 100644
--- a/arch/sparc/include/asm/dma-mapping.h
+++ b/arch/sparc/include/asm/dma-mapping.h
@@ -24,14 +24,14 @@ extern const struct dma_map_ops pci32_dma_ops;
 
 extern struct bus_type pci_bus_type;
 
-static inline const struct dma_map_ops *get_dma_ops(struct device *dev)
+static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
 {
 #ifdef CONFIG_SPARC_LEON
 	if (sparc_cpu_model == sparc_leon)
 		return leon_dma_ops;
 #endif
 #if defined(CONFIG_SPARC32) && defined(CONFIG_PCI)
-	if (dev->bus == &pci_bus_type)
+	if (bus == &pci_bus_type)
 		return &pci32_dma_ops;
 #endif
 	return dma_ops;
diff --git a/arch/tile/include/asm/dma-mapping.h b/arch/tile/include/asm/dma-mapping.h
index 2562995a6ac964a0ec7d7d56c100e72ab595d4fd..bbc71a29b2c6a860abf9d7a9d81a6ad75a57f7a1 100644
--- a/arch/tile/include/asm/dma-mapping.h
+++ b/arch/tile/include/asm/dma-mapping.h
@@ -29,12 +29,9 @@ extern const struct dma_map_ops *gx_pci_dma_map_ops;
 extern const struct dma_map_ops *gx_legacy_pci_dma_map_ops;
 extern const struct dma_map_ops *gx_hybrid_pci_dma_map_ops;
 
-static inline const struct dma_map_ops *get_dma_ops(struct device *dev)
+static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
 {
-	if (dev && dev->dma_ops)
-		return dev->dma_ops;
-	else
-		return tile_dma_map_ops;
+	return tile_dma_map_ops;
 }
 
 static inline dma_addr_t get_dma_offset(struct device *dev)
diff --git a/arch/unicore32/include/asm/dma-mapping.h b/arch/unicore32/include/asm/dma-mapping.h
index 14d7729c7b73ec7d4dd937b72d46917573534167..518ba5848dd6c921dec86e84942edeb687c57f0a 100644
--- a/arch/unicore32/include/asm/dma-mapping.h
+++ b/arch/unicore32/include/asm/dma-mapping.h
@@ -23,7 +23,7 @@
 
 extern const struct dma_map_ops swiotlb_dma_map_ops;
 
-static inline const struct dma_map_ops *get_dma_ops(struct device *dev)
+static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
 {
 	return &swiotlb_dma_map_ops;
 }
diff --git a/arch/x86/include/asm/dma-mapping.h b/arch/x86/include/asm/dma-mapping.h
index 94b5b96966cba5e6978c134cc88e1a2a3edfd2f0..08a0838b83fb33ccbf04abce495c469e95ce4253 100644
--- a/arch/x86/include/asm/dma-mapping.h
+++ b/arch/x86/include/asm/dma-mapping.h
@@ -27,16 +27,9 @@ extern int panic_on_overflow;
 
 extern const struct dma_map_ops *dma_ops;
 
-static inline const struct dma_map_ops *get_dma_ops(struct device *dev)
+static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
 {
-#ifndef CONFIG_X86_DEV_DMA_OPS
 	return dma_ops;
-#else
-	if (unlikely(!dev) || !dev->dma_ops)
-		return dma_ops;
-	else
-		return dev->dma_ops;
-#endif
 }
 
 bool arch_dma_alloc_attrs(struct device **dev, gfp_t *gfp);
diff --git a/arch/xtensa/include/asm/dma-mapping.h b/arch/xtensa/include/asm/dma-mapping.h
index 9eecfc3c5dc4045c4de3ac7de2306e8cfc751463..c6140fa8c0beb7512f9973218399ee03f1b38cc1 100644
--- a/arch/xtensa/include/asm/dma-mapping.h
+++ b/arch/xtensa/include/asm/dma-mapping.h
@@ -20,12 +20,9 @@
 
 extern const struct dma_map_ops xtensa_dma_map_ops;
 
-static inline const struct dma_map_ops *get_dma_ops(struct device *dev)
+static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
 {
-	if (dev && dev->dma_ops)
-		return dev->dma_ops;
-	else
-		return &xtensa_dma_map_ops;
+	return &xtensa_dma_map_ops;
 }
 
 void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
index e97f23e8b2d9b0d1fd24cf07468224ad1e38522c..ab8710888ddffba4c0c3d0bf761e9a9a46908cc0 100644
--- a/include/linux/dma-mapping.h
+++ b/include/linux/dma-mapping.h
@@ -164,6 +164,13 @@ int dma_mmap_from_coherent(struct device *dev, struct vm_area_struct *vma,
 
 #ifdef CONFIG_HAS_DMA
 #include <asm/dma-mapping.h>
+static inline const struct dma_map_ops *get_dma_ops(struct device *dev)
+{
+	if (dev && dev->dma_ops)
+		return dev->dma_ops;
+	return get_arch_dma_ops(dev ? dev->bus : NULL);
+}
+
 static inline void set_dma_ops(struct device *dev,
 			       const struct dma_map_ops *dma_ops)
 {