[ARM] Don't call consistent_sync() for DMA coherent memory

[pandora-kernel.git] / arch / arm / common / dmabounce.c

diff --git a/arch/arm/common/dmabounce.c b/arch/arm/common/dmabounce.c
index 5b7c263..272702a 100644 (file)
--- a/arch/arm/common/dmabounce.c
+++ b/arch/arm/common/dmabounce.c
@@ -179,17 +179,19 @@ alloc_safe_buffer(struct dmabounce_device_info *device_info, void *ptr,
 static inline struct safe_buffer *
 find_safe_buffer(struct dmabounce_device_info *device_info, dma_addr_t safe_dma_addr)
 {
-       struct safe_buffer *b = NULL;
+       struct safe_buffer *b, *rb = NULL;
        unsigned long flags;
 
        read_lock_irqsave(&device_info->lock, flags);
 
        list_for_each_entry(b, &device_info->safe_buffers, node)
-               if (b->safe_dma_addr == safe_dma_addr)
+               if (b->safe_dma_addr == safe_dma_addr) {
+                       rb = b;
                        break;
+               }
 
        read_unlock_irqrestore(&device_info->lock, flags);
-       return b;
+       return rb;
 }
 
 static inline void
@@ -279,10 +281,14 @@ map_single(struct device *dev, void *ptr, size_t size,
                ptr = buf->safe;
 
                dma_addr = buf->safe_dma_addr;
+       } else {
+               /*
+                * We don't need to sync the DMA buffer since
+                * it was allocated via the coherent allocators.
+                */
+               consistent_sync(ptr, size, dir);
        }
 
-       consistent_sync(ptr, size, dir);
-
        return dma_addr;
 }
 
@@ -395,7 +401,10 @@ sync_single(struct device *dev, dma_addr_t dma_addr, size_t size,
                default:
                        BUG();
                }
-               consistent_sync(buf->safe, size, dir);
+               /*
+                * No need to sync the safe buffer - it was allocated
+                * via the coherent allocators.
+                */
        } else {
                consistent_sync(dma_to_virt(dev, dma_addr), size, dir);
        }
@@ -660,7 +669,8 @@ EXPORT_SYMBOL(dma_map_single);
 EXPORT_SYMBOL(dma_unmap_single);
 EXPORT_SYMBOL(dma_map_sg);
 EXPORT_SYMBOL(dma_unmap_sg);
-EXPORT_SYMBOL(dma_sync_single);
+EXPORT_SYMBOL(dma_sync_single_for_cpu);
+EXPORT_SYMBOL(dma_sync_single_for_device);
 EXPORT_SYMBOL(dma_sync_sg);
 EXPORT_SYMBOL(dmabounce_register_dev);
 EXPORT_SYMBOL(dmabounce_unregister_dev);