firewire: core: WARN on wrong usage of core transaction functions

In the code path which creates request packets, clearly mark a switch
branch which must never be reached with a WARN.

In the code path which creates response packets, replace a BUG by a
friendlier to debug WARN.

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

1 files changed, 4 insertions, 2 deletions

diff --git a/drivers/firewire/core-transaction.c b/drivers/firewire/core-transaction.c
index 203e6428bada..66789c3cc561 100644
--- a/drivers/firewire/core-transaction.c
+++ b/drivers/firewire/core-transaction.c
@@ -218,6 +218,9 @@ static void fw_fill_request(struct fw_packet *packet, int tcode, int tlabel,
                 packet->header_length = 16;
                 packet->payload_length = 0;
                 break;
+
+        default:
+                WARN(1, KERN_ERR "wrong tcode %d", tcode);
         }
  common:
         packet->speed = speed;
@@ -595,8 +598,7 @@ void fw_fill_response(struct fw_packet *response, u32 *request_header,
                 break;
 
         default:
-                BUG();
-                return;
+                WARN(1, KERN_ERR "wrong tcode %d", tcode);
         }
 
         response->payload_bus = 0;