staging: unisys: visorbus: add error handling to chipset_bus_create

The function chipset_bus_create should return an error. If an error
is returned, it is assumed the response has not been sent by bus_create.

Correctly handle when the error has been returned in visorchipset.
Signed-off-by: David Kershner <david.kershner@unisys.com>
Reviewed-by: Reviewed-by: Tim Sell <timothy.sell@unisys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/unisys/visorbus/visorbus_main.c

@@ -1090,24 +1090,25 @@ remove_all_visor_devices(void)
 	}
 }
 
-void
+int
 chipset_bus_create(struct visor_device *dev)
 {
-	int rc;
+	int err;
 	u32 bus_no = dev->chipset_bus_no;
 
 	POSTCODE_LINUX(BUS_CREATE_ENTRY_PC, 0, bus_no, DIAG_SEVERITY_PRINT);
-	rc = create_bus_instance(dev);
+	err = create_bus_instance(dev);
 	POSTCODE_LINUX(BUS_CREATE_EXIT_PC, 0, bus_no, DIAG_SEVERITY_PRINT);
 
-	if (rc < 0)
+	if (err < 0) {
 		POSTCODE_LINUX(BUS_CREATE_FAILURE_PC, 0, bus_no,
 			       DIAG_SEVERITY_ERR);
-	else
-		POSTCODE_LINUX(CHIPSET_INIT_SUCCESS_PC, 0, bus_no,
-			       DIAG_SEVERITY_PRINT);
+		return err;
+	}
+
+	bus_create_response(dev, err);
 
-	bus_create_response(dev, rc);
+	return 0;
 }
 
 void

drivers/staging/unisys/visorbus/visorbus_private.h

@@ -27,7 +27,7 @@
  * command line
  */
 
-void chipset_bus_create(struct visor_device *bus_info);
+int chipset_bus_create(struct visor_device *bus_info);
 void chipset_bus_destroy(struct visor_device *bus_info);
 void chipset_device_create(struct visor_device *dev_info);
 void chipset_device_destroy(struct visor_device *dev_info);

drivers/staging/unisys/visorbus/visorchipset.c

@@ -656,11 +656,17 @@ bus_create(struct controlvm_message *inmsg)
 	bus_info->visorchannel = visorchannel;
 
 	/* Response will be handled by chipset_bus_create */
-	chipset_bus_create(bus_info);
+	err = chipset_bus_create(bus_info);
+	/* If error chipset_bus_create didn't respond, need to respond here */
+	if (err)
+		goto err_destroy_channel;
 
 	POSTCODE_LINUX(BUS_CREATE_EXIT_PC, 0, bus_no, DIAG_SEVERITY_PRINT);
 	return 0;
 
+err_destroy_channel:
+	visorchannel_destroy(visorchannel);
+
 err_free_pending_msg:
 	kfree(bus_info->pending_msg_hdr);