dma-mapping: remove dma_configure

There is no good reason for this indirection given that the method
always exists.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>

drivers/base/dd.c

@@ -480,9 +480,11 @@ re_probe:
 	if (ret)
 		goto pinctrl_bind_failed;
 
-	ret = dma_configure(dev);
-	if (ret)
-		goto dma_failed;
+	if (dev->bus->dma_configure) {
+		ret = dev->bus->dma_configure(dev);
+		if (ret)
+			goto dma_failed;
+	}
 
 	if (driver_sysfs_add(dev)) {
 		printk(KERN_ERR "%s: driver_sysfs_add(%s) failed\n",

include/linux/dma-mapping.h

@@ -754,14 +754,8 @@ dma_mark_declared_memory_occupied(struct device *dev,
 #endif /* CONFIG_HAVE_GENERIC_DMA_COHERENT */
 
 #ifdef CONFIG_HAS_DMA
-int dma_configure(struct device *dev);
 void dma_deconfigure(struct device *dev);
 #else
-static inline int dma_configure(struct device *dev)
-{
-	return 0;
-}
-
 static inline void dma_deconfigure(struct device *dev) {}
 #endif
 

kernel/dma/mapping.c

@@ -328,16 +328,6 @@ void dma_common_free_remap(void *cpu_addr, size_t size, unsigned long vm_flags)
 }
 #endif
 
-/*
- * enables DMA API use for a device
- */
-int dma_configure(struct device *dev)
-{
-	if (dev->bus->dma_configure)
-		return dev->bus->dma_configure(dev);
-	return 0;
-}
-
 void dma_deconfigure(struct device *dev)
 {
 	of_dma_deconfigure(dev);