[MIPS] PCI: Port i386 PCI fixes.

The MIPS version of pcibios_enalbe_resources did not have the fixes
from ed6d14f9 yet which under circumstances
similar to x86 might result in failures.
Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

arch/mips/pci/pci.c

@@ -177,6 +177,11 @@ static int pcibios_enable_resources(struct pci_dev *dev, int mask)
 			continue;
 
 		r = &dev->resource[idx];
+		if (!(r->flags & (IORESOURCE_IO | IORESOURCE_MEM)))
+			continue;
+		if ((idx == PCI_ROM_RESOURCE) &&
+				(!(r->flags & IORESOURCE_ROM_ENABLE)))
+			continue;
 		if (!r->start && r->end) {
 			printk(KERN_ERR "PCI: Device %s not available because of resource collisions\n", pci_name(dev));
 			return -EINVAL;
@@ -186,8 +191,6 @@ static int pcibios_enable_resources(struct pci_dev *dev, int mask)
 		if (r->flags & IORESOURCE_MEM)
 			cmd |= PCI_COMMAND_MEMORY;
 	}
-	if (dev->resource[PCI_ROM_RESOURCE].start)
-		cmd |= PCI_COMMAND_MEMORY;
 	if (cmd != old_cmd) {
 		printk("PCI: Enabling device %s (%04x -> %04x)\n", pci_name(dev), old_cmd, cmd);
 		pci_write_config_word(dev, PCI_COMMAND, cmd);