PCI: allow pci driver to support only dynids

commit b41d6cf3 (PCI: Check dynids driver_data value for validity)
requires all drivers to include an id table to try and match
driver_data.  Before validating driver_data check driver has an id
table.
Acked-by: Jean Delvare <khali@linux-fr.org>
Cc: Milton Miller <miltonm@bga.com>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

drivers/pci/pci-driver.c

@@ -48,7 +48,7 @@ store_new_id(struct device_driver *driver, const char *buf, size_t count)
 		subdevice=PCI_ANY_ID, class=0, class_mask=0;
 	unsigned long driver_data=0;
 	int fields=0;
-	int retval;
+	int retval=0;
 
 	fields = sscanf(buf, "%x %x %x %x %x %x %lx",
 			&vendor, &device, &subvendor, &subdevice,
@@ -58,6 +58,7 @@ store_new_id(struct device_driver *driver, const char *buf, size_t count)
 
 	/* Only accept driver_data values that match an existing id_table
 	   entry */
+	if (ids) {
 		retval = -EINVAL;
 		while (ids->vendor || ids->subvendor || ids->class_mask) {
 			if (driver_data == ids->driver_data) {
@@ -68,6 +69,7 @@ store_new_id(struct device_driver *driver, const char *buf, size_t count)
 		}
 		if (retval)	/* No match */
 			return retval;
+	}
 
 	dynid = kzalloc(sizeof(*dynid), GFP_KERNEL);
 	if (!dynid)