openwrt/target/linux/brcm2708/patches-3.18/0057-Revert-ARM-dma-Use-dma_pfn_offset-for-dma-address-tr.patch

From 48c48c4437603bad79eb848ac03b21a86cc3bb90 Mon Sep 17 00:00:00 2001
From: popcornmix <popcornmix@gmail.com>
Date: Thu, 7 Aug 2014 02:03:50 +0100
Subject: [PATCH 057/114] Revert "ARM: dma: Use dma_pfn_offset for dma address
 translation"

This reverts commit 6ce0d20016925d031f1e24d64302e4c976d7cec6.
---
 arch/arm/include/asm/dma-mapping.h | 18 +-----------------
 1 file changed, 1 insertion(+), 17 deletions(-)

--- a/arch/arm/include/asm/dma-mapping.h
+++ b/arch/arm/include/asm/dma-mapping.h
@@ -58,37 +58,21 @@ static inline int dma_set_mask(struct de
 #ifndef __arch_pfn_to_dma
 static inline dma_addr_t pfn_to_dma(struct device *dev, unsigned long pfn)
 {
-	if (dev)
-		pfn -= dev->dma_pfn_offset;
 	return (dma_addr_t)__pfn_to_bus(pfn);
 }
 
 static inline unsigned long dma_to_pfn(struct device *dev, dma_addr_t addr)
 {
-	unsigned long pfn = __bus_to_pfn(addr);
-
-	if (dev)
-		pfn += dev->dma_pfn_offset;
-
-	return pfn;
+	return __bus_to_pfn(addr);
 }
 
 static inline void *dma_to_virt(struct device *dev, dma_addr_t addr)
 {
-	if (dev) {
-		unsigned long pfn = dma_to_pfn(dev, addr);
-
-		return phys_to_virt(__pfn_to_phys(pfn));
-	}
-
 	return (void *)__bus_to_virt((unsigned long)addr);
 }
 
 static inline dma_addr_t virt_to_dma(struct device *dev, void *addr)
 {
-	if (dev)
-		return pfn_to_dma(dev, virt_to_pfn(addr));
-
 	return (dma_addr_t)__virt_to_bus((unsigned long)(addr));
 }