scsi: esp_scsi: use strong typing for the dev field

esp->dev is a void pointer that points either to a struct device, or a
struct platform_device.  As we can easily get from the device to the
platform_device if needed change it to always point to a struct device
and properly type the pointer to avoid errors.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Tested-by: Finn Thain <fthain@telegraphics.com.au>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/esp_scsi.h

@@ -435,7 +435,7 @@ struct esp {
 	const struct esp_driver_ops *ops;
 
 	struct Scsi_Host	*host;
-	void			*dev;
+	struct device		*dev;
 
 	struct esp_cmd_entry	*active_cmd;
 

drivers/scsi/mac_esp.c

@@ -58,8 +58,7 @@ static struct esp *esp_chips[2];
 static DEFINE_SPINLOCK(esp_chips_lock);
 
 #define MAC_ESP_GET_PRIV(esp) ((struct mac_esp_priv *) \
-			       platform_get_drvdata((struct platform_device *) \
-						    (esp->dev)))
+			       dev_get_drvdata((esp)->dev))
 
 static inline void mac_esp_write8(struct esp *esp, u8 val, unsigned long reg)
 {
@@ -508,7 +507,7 @@ static int esp_mac_probe(struct platform_device *dev)
 	esp = shost_priv(host);
 
 	esp->host = host;
-	esp->dev = dev;
+	esp->dev = &dev->dev;
 
 	esp->command_block = kzalloc(16, GFP_KERNEL);
 	if (!esp->command_block)

drivers/scsi/sun_esp.c

@@ -80,7 +80,7 @@ static int esp_sbus_setup_dma(struct esp *esp, struct platform_device *dma_of)
 
 static int esp_sbus_map_regs(struct esp *esp, int hme)
 {
-	struct platform_device *op = esp->dev;
+	struct platform_device *op = to_platform_device(esp->dev);
 	struct resource *res;
 
 	/* On HME, two reg sets exist, first is DVMA,
@@ -100,9 +100,7 @@ static int esp_sbus_map_regs(struct esp *esp, int hme)
 
 static int esp_sbus_map_command_block(struct esp *esp)
 {
-	struct platform_device *op = esp->dev;
-
-	esp->command_block = dma_alloc_coherent(&op->dev, 16,
+	esp->command_block = dma_alloc_coherent(esp->dev, 16,
 						&esp->command_block_dma,
 						GFP_KERNEL);
 	if (!esp->command_block)
@@ -113,7 +111,7 @@ static int esp_sbus_map_command_block(struct esp *esp)
 static int esp_sbus_register_irq(struct esp *esp)
 {
 	struct Scsi_Host *host = esp->host;
-	struct platform_device *op = esp->dev;
+	struct platform_device *op = to_platform_device(esp->dev);
 
 	host->irq = op->archdata.irqs[0];
 	return request_irq(host->irq, scsi_esp_intr, IRQF_SHARED, "ESP", esp);
@@ -121,7 +119,7 @@ static int esp_sbus_register_irq(struct esp *esp)
 
 static void esp_get_scsi_id(struct esp *esp, struct platform_device *espdma)
 {
-	struct platform_device *op = esp->dev;
+	struct platform_device *op = to_platform_device(esp->dev);
 	struct device_node *dp;
 
 	dp = op->dev.of_node;
@@ -143,7 +141,7 @@ static void esp_get_scsi_id(struct esp *esp, struct platform_device *espdma)
 
 static void esp_get_differential(struct esp *esp)
 {
-	struct platform_device *op = esp->dev;
+	struct platform_device *op = to_platform_device(esp->dev);
 	struct device_node *dp;
 
 	dp = op->dev.of_node;
@@ -155,7 +153,7 @@ static void esp_get_differential(struct esp *esp)
 
 static void esp_get_clock_params(struct esp *esp)
 {
-	struct platform_device *op = esp->dev;
+	struct platform_device *op = to_platform_device(esp->dev);
 	struct device_node *bus_dp, *dp;
 	int fmhz;
 
@@ -172,7 +170,7 @@ static void esp_get_clock_params(struct esp *esp)
 static void esp_get_bursts(struct esp *esp, struct platform_device *dma_of)
 {
 	struct device_node *dma_dp = dma_of->dev.of_node;
-	struct platform_device *op = esp->dev;
+	struct platform_device *op = to_platform_device(esp->dev);
 	struct device_node *dp;
 	u8 bursts, val;
 
@@ -215,33 +213,25 @@ static u8 sbus_esp_read8(struct esp *esp, unsigned long reg)
 static dma_addr_t sbus_esp_map_single(struct esp *esp, void *buf,
 				      size_t sz, int dir)
 {
-	struct platform_device *op = esp->dev;
-
-	return dma_map_single(&op->dev, buf, sz, dir);
+	return dma_map_single(esp->dev, buf, sz, dir);
 }
 
 static int sbus_esp_map_sg(struct esp *esp, struct scatterlist *sg,
 				  int num_sg, int dir)
 {
-	struct platform_device *op = esp->dev;
-
-	return dma_map_sg(&op->dev, sg, num_sg, dir);
+	return dma_map_sg(esp->dev, sg, num_sg, dir);
 }
 
 static void sbus_esp_unmap_single(struct esp *esp, dma_addr_t addr,
 				  size_t sz, int dir)
 {
-	struct platform_device *op = esp->dev;
-
-	dma_unmap_single(&op->dev, addr, sz, dir);
+	dma_unmap_single(esp->dev, addr, sz, dir);
 }
 
 static void sbus_esp_unmap_sg(struct esp *esp, struct scatterlist *sg,
 			      int num_sg, int dir)
 {
-	struct platform_device *op = esp->dev;
-
-	dma_unmap_sg(&op->dev, sg, num_sg, dir);
+	dma_unmap_sg(esp->dev, sg, num_sg, dir);
 }
 
 static int sbus_esp_irq_pending(struct esp *esp)
@@ -255,14 +245,13 @@ static void sbus_esp_reset_dma(struct esp *esp)
 {
 	int can_do_burst16, can_do_burst32, can_do_burst64;
 	int can_do_sbus64, lim;
-	struct platform_device *op;
+	struct platform_device *op = to_platform_device(esp->dev);
 	u32 val;
 
 	can_do_burst16 = (esp->bursts & DMA_BURST16) != 0;
 	can_do_burst32 = (esp->bursts & DMA_BURST32) != 0;
 	can_do_burst64 = 0;
 	can_do_sbus64 = 0;
-	op = esp->dev;
 	if (sbus_can_dma_64bit())
 		can_do_sbus64 = 1;
 	if (sbus_can_burst64())
@@ -504,7 +493,7 @@ static int esp_sbus_probe_one(struct platform_device *op,
 	esp = shost_priv(host);
 
 	esp->host = host;
-	esp->dev = op;
+	esp->dev = &op->dev;
 	esp->ops = &sbus_esp_ops;
 
 	if (hme)