[PATCH] cciss: avoid reading PCI config space

From: mikem@beardog.cca.cpqcorp.net

This patch replaces reading directly form PCI config space where possible.
Most of what we need is in the pdev struct.  This is in 2.4.

drivers/block/cciss.c

@@ -2121,9 +2121,8 @@ static int find_PCI_BAR_index(struct pci_dev *pdev,
 
 static int cciss_pci_init(ctlr_info_t *c, struct pci_dev *pdev)
 {
-	ushort vendor_id, device_id, command;
-	unchar cache_line_size, latency_timer;
-	unchar irq, revision;
+	ushort subsystem_vendor_id, subsystem_device_id, command;
+	unchar irq = pdev->irq;
 	__u32 board_id, scratchpad = 0;
 	__u64 cfg_offset;
 	__u32 cfg_base_addr;
@@ -2150,17 +2149,10 @@ static int cciss_pci_init(ctlr_info_t *c, struct pci_dev *pdev)
 		return(-1);
 	}
 
-	vendor_id = pdev->vendor;
-	device_id = pdev->device;
-	irq = pdev->irq;
-
-	(void) pci_read_config_byte(pdev, PCI_CLASS_REVISION, &revision);
-	(void) pci_read_config_byte(pdev, PCI_CACHE_LINE_SIZE,
-						&cache_line_size);
-	(void) pci_read_config_byte(pdev, PCI_LATENCY_TIMER,
-						&latency_timer);
-	(void) pci_read_config_dword(pdev, PCI_SUBSYSTEM_VENDOR_ID, 
-						&board_id);
+	subsystem_vendor_id = pdev->subsystem_vendor;
+	subsystem_device_id = pdev->subsystem_device;
+	board_id = (((__u32) (subsystem_device_id << 16) & 0xffff0000) |
+					subsystem_vendor_id);
 
 	/* search for our IO range so we can protect it */
 	for(i=0; i<DEVICE_COUNT_RESOURCE; i++)
@@ -2188,15 +2180,8 @@ static int cciss_pci_init(ctlr_info_t *c, struct pci_dev *pdev)
 	}
 
 #ifdef CCISS_DEBUG
-	printk("vendor_id = %x\n", vendor_id);
-	printk("device_id = %x\n", device_id);
 	printk("command = %x\n", command);
-	for(i=0; i<6; i++)
-		printk("addr[%d] = %x\n", i, pci_resource_start(pdev, i);
-	printk("revision = %x\n", revision);
 	printk("irq = %x\n", irq);
-	printk("cache_line_size = %x\n", cache_line_size);
-	printk("latency_timer = %x\n", latency_timer);
 	printk("board_id = %x\n", board_id);
 #endif /* CCISS_DEBUG */