nubus: Call put_device() in bus initialization error path

The error path for bus initialization is missing a call to put_device().
Add that call.  This error path will probably never actually execute,
but any kernel source code may be subject to static checking or re-use.

Cc: Haoxiang Li <lihaoxiang@isrc.iscas.ac.cn>
Cc: Daniel Palmer <daniel@0x0f.com>
Suggested-by: Haoxiang Li <lihaoxiang@isrc.iscas.ac.cn>
Signed-off-by: Finn Thain <fthain@linux-m68k.org>
Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>
Link: https://patch.msgid.link/478d5f080d74b6688c9e3f9132e3fe251e997ad7.1765610469.git.fthain@linux-m68k.org
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>

Author: fthain

drivers/nubus/bus.c

@@ -51,21 +51,12 @@ void nubus_driver_unregister(struct nubus_driver *ndrv)
 }
 EXPORT_SYMBOL(nubus_driver_unregister);
 
-static struct device nubus_parent = {
-	.init_name	= "nubus",
-};
-
 static int __init nubus_bus_register(void)
 {
 	return bus_register(&nubus_bus_type);
 }
 postcore_initcall(nubus_bus_register);
 
-int __init nubus_parent_device_register(void)
-{
-	return device_register(&nubus_parent);
-}
-
 static void nubus_device_release(struct device *dev)
 {
 	struct nubus_board *board = to_nubus_board(dev);
@@ -79,9 +70,9 @@ static void nubus_device_release(struct device *dev)
 	kfree(board);
 }
 
-int nubus_device_register(struct nubus_board *board)
+int nubus_device_register(struct device *parent, struct nubus_board *board)
 {
-	board->dev.parent = &nubus_parent;
+	board->dev.parent = parent;
 	board->dev.release = nubus_device_release;
 	board->dev.bus = &nubus_bus_type;
 	dev_set_name(&board->dev, "slot.%X", board->slot);

drivers/nubus/nubus.c

@@ -41,6 +41,10 @@ module_param_named(populate_procfs, nubus_populate_procfs, bool, 0);
 
 LIST_HEAD(nubus_func_rsrcs);
 
+static struct device nubus_parent = {
+	.init_name	= "nubus",
+};
+
 /* Meaning of "bytelanes":
 
    The card ROM may appear on any or all bytes of each long word in
@@ -829,7 +833,7 @@ static void __init nubus_add_board(int slot, int bytelanes)
 		list_add_tail(&fres->list, &nubus_func_rsrcs);
 	}
 
-	if (nubus_device_register(board))
+	if (nubus_device_register(&nubus_parent, board))
 		put_device(&board->dev);
 }
 
@@ -882,9 +886,11 @@ static int __init nubus_init(void)
 		return 0;
 
 	nubus_proc_init();
-	err = nubus_parent_device_register();
-	if (err)
+	err = device_register(&nubus_parent);
+	if (err) {
+		put_device(&nubus_parent);
 		return err;
+	}
 	nubus_scan_bus();
 	return 0;
 }

include/linux/nubus.h

@@ -162,8 +162,7 @@ void nubus_seq_write_rsrc_mem(struct seq_file *m,
 unsigned char *nubus_dirptr(const struct nubus_dirent *nd);
 
 /* Declarations relating to driver model objects */
-int nubus_parent_device_register(void);
-int nubus_device_register(struct nubus_board *board);
+int nubus_device_register(struct device *parent, struct nubus_board *board);
 int nubus_driver_register(struct nubus_driver *ndrv);
 void nubus_driver_unregister(struct nubus_driver *ndrv);
 int nubus_proc_show(struct seq_file *m, void *data);