ieee1394: prevent device binding of raw1394, video1394, dv1394

These drivers don't need to match any unit_directory type device.
They just need the id_table for module autoloading per module alias.

Not binding any of these drivers allows special-purpose drivers with
similar or same IDs to bind to devices.  This currently only benefits
out-of-tree drivers; on the other hand it is in no way detrimental to
in-tree drivers.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>

1 files changed, 5 insertions, 1 deletions

diff --git a/drivers/ieee1394/nodemgr.c b/drivers/ieee1394/nodemgr.c
index 511e4321c6b6..70afa3786f3f 100644
--- a/drivers/ieee1394/nodemgr.c
+++ b/drivers/ieee1394/nodemgr.c
@@ -701,7 +701,11 @@ static int nodemgr_bus_match(struct device * dev, struct device_driver * drv)
                 return 0;
 
         driver = container_of(drv, struct hpsb_protocol_driver, driver);
-        for (id = driver->id_table; id->match_flags != 0; id++) {
+        id = driver->id_table;
+        if (!id)
+                return 0;
+
+        for (; id->match_flags != 0; id++) {
                 if ((id->match_flags & IEEE1394_MATCH_VENDOR_ID) &&
                     id->vendor_id != ud->vendor_id)
                         continue;