1 files changed, 16 insertions, 11 deletions

diff --git a/arch/x86/kernel/pci-dma.c b/arch/x86/kernel/pci-dma.c
index cbecb05551bb..37544123896d 100644
--- a/arch/x86/kernel/pci-dma.c
+++ b/arch/x86/kernel/pci-dma.c
@@ -11,7 +11,7 @@
 
 static int forbid_dac __read_mostly;
 
-const struct dma_mapping_ops *dma_ops;
+struct dma_mapping_ops *dma_ops;
 EXPORT_SYMBOL(dma_ops);
 
 static int iommu_sac_force __read_mostly;
@@ -312,6 +312,8 @@ static int dma_release_coherent(struct device *dev, int order, void *vaddr)
 
 int dma_supported(struct device *dev, u64 mask)
 {
+        struct dma_mapping_ops *ops = get_dma_ops(dev);
+
 #ifdef CONFIG_PCI
         if (mask > 0xffffffff && forbid_dac > 0) {
                 dev_info(dev, "PCI: Disallowing DAC for device\n");
@@ -319,8 +321,8 @@ int dma_supported(struct device *dev, u64 mask)
         }
 #endif
 
-        if (dma_ops->dma_supported)
-                return dma_ops->dma_supported(dev, mask);
+        if (ops->dma_supported)
+                return ops->dma_supported(dev, mask);
 
         /* Copied from i386. Doesn't make much sense, because it will
            only work for pci_alloc_coherent.
@@ -367,6 +369,7 @@ void *
 dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
                    gfp_t gfp)
 {
+        struct dma_mapping_ops *ops = get_dma_ops(dev);
         void *memory = NULL;
         struct page *page;
         unsigned long dma_mask = 0;
@@ -435,8 +438,8 @@ dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
                         /* Let low level make its own zone decisions */
                         gfp &= ~(GFP_DMA32|GFP_DMA);
 
-                        if (dma_ops->alloc_coherent)
-                                return dma_ops->alloc_coherent(dev, size,
+                        if (ops->alloc_coherent)
+                                return ops->alloc_coherent(dev, size,
                                                            dma_handle, gfp);
                         return NULL;
                 }
@@ -448,14 +451,14 @@ dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
                 }
         }
 
-        if (dma_ops->alloc_coherent) {
+        if (ops->alloc_coherent) {
                 free_pages((unsigned long)memory, get_order(size));
                 gfp &= ~(GFP_DMA|GFP_DMA32);
-                return dma_ops->alloc_coherent(dev, size, dma_handle, gfp);
+                return ops->alloc_coherent(dev, size, dma_handle, gfp);
         }
 
-        if (dma_ops->map_simple) {
-                *dma_handle = dma_ops->map_simple(dev, virt_to_phys(memory),
+        if (ops->map_simple) {
+                *dma_handle = ops->map_simple(dev, virt_to_phys(memory),
                                               size,
                                               PCI_DMA_BIDIRECTIONAL);
                 if (*dma_handle != bad_dma_address)
@@ -477,12 +480,14 @@ EXPORT_SYMBOL(dma_alloc_coherent);
 void dma_free_coherent(struct device *dev, size_t size,
                          void *vaddr, dma_addr_t bus)
 {
+        struct dma_mapping_ops *ops = get_dma_ops(dev);
+
         int order = get_order(size);
         WARN_ON(irqs_disabled());       /* for portability */
         if (dma_release_coherent(dev, order, vaddr))
                 return;
-        if (dma_ops->unmap_single)
-                dma_ops->unmap_single(dev, bus, size, 0);
+        if (ops->unmap_single)
+                ops->unmap_single(dev, bus, size, 0);
         free_pages((unsigned long)vaddr, order);
 }
 EXPORT_SYMBOL(dma_free_coherent);