From: Al Viro <viro@ftp.linux.org.uk>
Date: Sun, 16 Dec 2007 23:30:08 +0000 (+0000)
Subject: sunhme endianness annotations
X-Git-Tag: v2.6.25-rc1~1162^2~349
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f3ec33e587df02e25963755989cc473e3f07bf0d;p=linux-2.6

sunhme endianness annotations

	This one is interesting - SBUS and PCI variants have
opposite endianness in descriptors (SBUS is sparc-only, so there
host-endian == big-endian).

	Solution: declare a bitwise type (hme32) and in accessor
helpers do typechecking and force-casts (once we know that the
type is right).

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
---

diff --git a/drivers/net/sunhme.c b/drivers/net/sunhme.c
index 9cc13dd8a8..25ce26a882 100644
--- a/drivers/net/sunhme.c
+++ b/drivers/net/sunhme.c
@@ -194,21 +194,21 @@ static u32 sbus_hme_read32(void __iomem *reg)
 
 static void sbus_hme_write_rxd(struct happy_meal_rxd *rxd, u32 flags, u32 addr)
 {
-	rxd->rx_addr = addr;
+	rxd->rx_addr = (__force hme32)addr;
 	wmb();
-	rxd->rx_flags = flags;
+	rxd->rx_flags = (__force hme32)flags;
 }
 
 static void sbus_hme_write_txd(struct happy_meal_txd *txd, u32 flags, u32 addr)
 {
-	txd->tx_addr = addr;
+	txd->tx_addr = (__force hme32)addr;
 	wmb();
-	txd->tx_flags = flags;
+	txd->tx_flags = (__force hme32)flags;
 }
 
-static u32 sbus_hme_read_desc32(u32 *p)
+static u32 sbus_hme_read_desc32(hme32 *p)
 {
-	return *p;
+	return (__force u32)*p;
 }
 
 static void pci_hme_write32(void __iomem *reg, u32 val)
@@ -223,21 +223,21 @@ static u32 pci_hme_read32(void __iomem *reg)
 
 static void pci_hme_write_rxd(struct happy_meal_rxd *rxd, u32 flags, u32 addr)
 {
-	rxd->rx_addr = cpu_to_le32(addr);
+	rxd->rx_addr = (__force hme32)cpu_to_le32(addr);
 	wmb();
-	rxd->rx_flags = cpu_to_le32(flags);
+	rxd->rx_flags = (__force hme32)cpu_to_le32(flags);
 }
 
 static void pci_hme_write_txd(struct happy_meal_txd *txd, u32 flags, u32 addr)
 {
-	txd->tx_addr = cpu_to_le32(addr);
+	txd->tx_addr = (__force hme32)cpu_to_le32(addr);
 	wmb();
-	txd->tx_flags = cpu_to_le32(flags);
+	txd->tx_flags = (__force hme32)cpu_to_le32(flags);
 }
 
-static u32 pci_hme_read_desc32(u32 *p)
+static u32 pci_hme_read_desc32(hme32 *p)
 {
-	return cpu_to_le32p(p);
+	return le32_to_cpup((__le32 *)p);
 }
 
 #define hme_write32(__hp, __reg, __val) \
@@ -266,16 +266,16 @@ static u32 pci_hme_read_desc32(u32 *p)
 #define hme_read32(__hp, __reg) \
 	sbus_readl(__reg)
 #define hme_write_rxd(__hp, __rxd, __flags, __addr) \
-do {	(__rxd)->rx_addr = (__addr); \
+do {	(__rxd)->rx_addr = (__force hme32)(u32)(__addr); \
 	wmb(); \
-	(__rxd)->rx_flags = (__flags); \
+	(__rxd)->rx_flags = (__force hme32)(u32)(__flags); \
 } while(0)
 #define hme_write_txd(__hp, __txd, __flags, __addr) \
-do {	(__txd)->tx_addr = (__addr); \
+do {	(__txd)->tx_addr = (__force hme32)(u32)(__addr); \
 	wmb(); \
-	(__txd)->tx_flags = (__flags); \
+	(__txd)->tx_flags = (__force hme32)(u32)(__flags); \
 } while(0)
-#define hme_read_desc32(__hp, __p)	(*(__p))
+#define hme_read_desc32(__hp, __p)	((__force u32)(hme32)*(__p))
 #define hme_dma_map(__hp, __ptr, __size, __dir) \
 	sbus_map_single((__hp)->happy_dev, (__ptr), (__size), (__dir))
 #define hme_dma_unmap(__hp, __addr, __size, __dir) \
@@ -291,16 +291,19 @@ do {	(__txd)->tx_addr = (__addr); \
 #define hme_read32(__hp, __reg) \
 	readl(__reg)
 #define hme_write_rxd(__hp, __rxd, __flags, __addr) \
-do {	(__rxd)->rx_addr = cpu_to_le32(__addr); \
+do {	(__rxd)->rx_addr = (__force hme32)cpu_to_le32(__addr); \
 	wmb(); \
-	(__rxd)->rx_flags = cpu_to_le32(__flags); \
+	(__rxd)->rx_flags = (__force hme32)cpu_to_le32(__flags); \
 } while(0)
 #define hme_write_txd(__hp, __txd, __flags, __addr) \
-do {	(__txd)->tx_addr = cpu_to_le32(__addr); \
+do {	(__txd)->tx_addr = (__force hme32)cpu_to_le32(__addr); \
 	wmb(); \
-	(__txd)->tx_flags = cpu_to_le32(__flags); \
+	(__txd)->tx_flags = (__force hme32)cpu_to_le32(__flags); \
 } while(0)
-#define hme_read_desc32(__hp, __p)	cpu_to_le32p(__p)
+static inline u32 hme_read_desc32(struct happy_meal *hp, hme32 *p)
+{
+	return le32_to_cpup((__le32 *)p);
+}
 #define hme_dma_map(__hp, __ptr, __size, __dir) \
 	pci_map_single((__hp)->happy_dev, (__ptr), (__size), (__dir))
 #define hme_dma_unmap(__hp, __addr, __size, __dir) \
@@ -2075,7 +2078,7 @@ static void happy_meal_rx(struct happy_meal *hp, struct net_device *dev)
 		}
 
 		/* This card is _fucking_ hot... */
-		skb->csum = ntohs(csum ^ 0xffff);
+		skb->csum = csum_unfold(~(__force __sum16)htons(csum));
 		skb->ip_summed = CHECKSUM_COMPLETE;
 
 		RXD(("len=%d csum=%4x]", len, csum));
diff --git a/drivers/net/sunhme.h b/drivers/net/sunhme.h
index 90f446db9b..4da5539fac 100644
--- a/drivers/net/sunhme.h
+++ b/drivers/net/sunhme.h
@@ -302,9 +302,11 @@
  * Always write the address first before setting the ownership
  * bits to avoid races with the hardware scanning the ring.
  */
+typedef u32 __bitwise__ hme32;
+
 struct happy_meal_rxd {
-	u32 rx_flags;
-	u32 rx_addr;
+	hme32 rx_flags;
+	hme32 rx_addr;
 };
 
 #define RXFLAG_OWN         0x80000000 /* 1 = hardware, 0 = software */
@@ -313,8 +315,8 @@ struct happy_meal_rxd {
 #define RXFLAG_CSUM        0x0000ffff /* HW computed checksum       */
 
 struct happy_meal_txd {
-	u32 tx_flags;
-	u32 tx_addr;
+	hme32 tx_flags;
+	hme32 tx_addr;
 };
 
 #define TXFLAG_OWN         0x80000000 /* 1 = hardware, 0 = software */
@@ -400,7 +402,7 @@ struct happy_meal {
 	struct hmeal_init_block  *happy_block;	/* RX and TX descriptors (CPU addr)  */
 
 #if defined(CONFIG_SBUS) && defined(CONFIG_PCI)
-	u32 (*read_desc32)(u32 *);
+	u32 (*read_desc32)(hme32 *);
 	void (*write_txd)(struct happy_meal_txd *, u32, u32);
 	void (*write_rxd)(struct happy_meal_rxd *, u32, u32);
 	u32 (*dma_map)(void *, void *, long, int);