staging: unisys: visorbus: add error handling for chipset_device_create

Adds error handling to the chipset_device_create message. If it returns
a failure, it is assumed it has not signaled the s-Par firmware of the
failure and the caller must do that.
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

@@ -1118,25 +1118,29 @@ chipset_bus_destroy(struct visor_device *dev)
 	bus_destroy_response(dev, 0);
 }
 
-void
+int
 chipset_device_create(struct visor_device *dev_info)
 {
-	int rc;
+	int err;
 	u32 bus_no = dev_info->chipset_bus_no;
 	u32 dev_no = dev_info->chipset_dev_no;
 
 	POSTCODE_LINUX(DEVICE_CREATE_ENTRY_PC, dev_no, bus_no,
 		       DIAG_SEVERITY_PRINT);
 
-	rc = create_visor_device(dev_info);
-	device_create_response(dev_info, rc);
-
-	if (rc < 0)
+	err = create_visor_device(dev_info);
+	if (err < 0) {
 		POSTCODE_LINUX(DEVICE_CREATE_FAILURE_PC, dev_no, bus_no,
 			       DIAG_SEVERITY_ERR);
-	else
+		return err;
+	}
+
 	POSTCODE_LINUX(DEVICE_CREATE_SUCCESS_PC, dev_no, bus_no,
 		       DIAG_SEVERITY_PRINT);
+
+	device_create_response(dev_info, err);
+
+	return 0;
 }
 
 void

drivers/staging/unisys/visorbus/visorbus_private.h

@@ -29,7 +29,7 @@
 
 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);
+int chipset_device_create(struct visor_device *dev_info);
 void chipset_device_destroy(struct visor_device *dev_info);
 void chipset_device_pause(struct visor_device *dev_info);
 void chipset_device_resume(struct visor_device *dev_info);

drivers/staging/unisys/visorbus/visorchipset.c

@@ -853,14 +853,14 @@ my_device_create(struct controlvm_message *inmsg)
 			spar_vhba_channel_protocol_uuid) == 0) {
 		err = save_crash_message(inmsg, CRASH_DEV);
 		if (err)
-			goto err_free_dev_info;
+			goto err_destroy_visorchannel;
 	}
 
 	if (inmsg->hdr.flags.response_expected == 1) {
 		pmsg_hdr = kzalloc(sizeof(*pmsg_hdr), GFP_KERNEL);
 		if (!pmsg_hdr) {
 			err = -ENOMEM;
-			goto err_free_dev_info;
+			goto err_destroy_visorchannel;
 		}
 
 		memcpy(pmsg_hdr, &inmsg->hdr,
@@ -868,11 +868,17 @@ my_device_create(struct controlvm_message *inmsg)
 		dev_info->pending_msg_hdr = pmsg_hdr;
 	}
 	/* Chipset_device_create will send response */
-	chipset_device_create(dev_info);
+	err = chipset_device_create(dev_info);
+	if (err)
+		goto err_destroy_visorchannel;
+
 	POSTCODE_LINUX(DEVICE_CREATE_EXIT_PC, dev_no, bus_no,
 		       DIAG_SEVERITY_PRINT);
 	return 0;
 
+err_destroy_visorchannel:
+	visorchannel_destroy(visorchannel);
+
 err_free_dev_info:
 	kfree(dev_info);