treewide: Consolidate get_dma_ops() implementations
Introduce a new architecture-specific get_arch_dma_ops() function
that takes a struct bus_type * argument. Add get_dma_ops() in
<linux/dma-mapping.h>.
Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Juergen Gross <jgross@suse.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: linux-arch@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: Russell King <linux@armlinux.org.uk>
Cc: x86@kernel.org
Signed-off-by: Doug Ledford <dledford@redhat.com>
diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
index e97f23e..ab87108 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)
{