PCI: Change all drivers to use pci_device->revision

Instead of all drivers reading pci config space to get the revision
ID, they can now use the pci_device->revision member.

This exposes some issues where drivers where reading a word or a dword
for the revision number, and adding useless error-handling around the
read. Some drivers even just read it for no purpose of all.

In devices where the revision ID is being copied over and used in what
appears to be the equivalent of hotpath, I have left the copy code
and the cached copy as not to influence the driver's performance.

Compile tested with make all{yes,mod}config on x86_64 and i386.

Signed-off-by: Auke Kok <auke-jan.h.kok@intel.com>
Acked-by: Dave Jones <davej@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/net/wan/pc300_drv.c

@@ -3439,7 +3439,6 @@ static int __devinit
 cpc_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 {
 	static int first_time = 1;
-	ucchar cpc_rev_id;
 	int err, eeprom_outdated = 0;
 	ucshort device_id;
 	pc300_t *card;
@@ -3480,7 +3479,6 @@ cpc_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 	card->hw.falcsize = pci_resource_len(pdev, 4);
 	card->hw.plxphys = pci_resource_start(pdev, 5);
 	card->hw.plxsize = pci_resource_len(pdev, 5);
-	pci_read_config_byte(pdev, PCI_REVISION_ID, &cpc_rev_id);
 
 	switch (device_id) {
 		case PCI_DEVICE_ID_PC300_RX_1:
@@ -3498,7 +3496,7 @@ cpc_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 	}
 #ifdef PC300_DEBUG_PCI
 	printk("cpc (bus=0x0%x,pci_id=0x%x,", pdev->bus->number, pdev->devfn);
-	printk("rev_id=%d) IRQ%d\n", cpc_rev_id, card->hw.irq);
+	printk("rev_id=%d) IRQ%d\n", pdev->revision, card->hw.irq);
 	printk("cpc:found  ramaddr=0x%08lx plxaddr=0x%08lx "
 	       "ctladdr=0x%08lx falcaddr=0x%08lx\n",
 	       card->hw.ramphys, card->hw.plxphys, card->hw.scaphys,