kobject: convert ibmasm to use kref, not kobject

The IBM asm driver is using a kobject only for reference counting,
nothing else.  So switch it to use a kref instead, which is all that is
needed, and is much smaller.

Cc: Max Asböck <amax@us.ibm.com>
Cc: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/misc/ibmasm/command.c

@@ -26,11 +26,6 @@
 #include "lowlevel.h"
 
 static void exec_next_command(struct service_processor *sp);
-static void free_command(struct kobject *kobj);
-
-static struct kobj_type ibmasm_cmd_kobj_type = {
-	.release = free_command,
-};
 
 static atomic_t command_count = ATOMIC_INIT(0);
 
@@ -53,8 +48,7 @@ struct command *ibmasm_new_command(struct service_processor *sp, size_t buffer_s
 	}
 	cmd->buffer_size = buffer_size;
 
-	kobject_init(&cmd->kobj);
-	cmd->kobj.ktype = &ibmasm_cmd_kobj_type;
+	kref_init(&cmd->kref);
 	cmd->lock = &sp->lock;
 
 	cmd->status = IBMASM_CMD_PENDING;
@@ -67,9 +61,9 @@ struct command *ibmasm_new_command(struct service_processor *sp, size_t buffer_s
 	return cmd;
 }
 
-static void free_command(struct kobject *kobj)
+void ibmasm_free_command(struct kref *kref)
 {
-	struct command *cmd = to_command(kobj);
+	struct command *cmd = to_command(kref);
 
 	list_del(&cmd->queue_node);
 	atomic_dec(&command_count);

drivers/misc/ibmasm/ibmasm.h

@@ -31,6 +31,7 @@
 #include <linux/slab.h>
 #include <linux/module.h>
 #include <linux/interrupt.h>
+#include <linux/kref.h>
 #include <linux/device.h>
 #include <linux/input.h>
 
@@ -92,24 +93,25 @@ struct command {
 	unsigned char		*buffer;
 	size_t			buffer_size;
 	int			status;
-	struct kobject		kobj;
+	struct kref		kref;
 	spinlock_t		*lock;
 };
-#define to_command(c) container_of(c, struct command, kobj)
+#define to_command(c) container_of(c, struct command, kref)
 
+void ibmasm_free_command(struct kref *kref);
 static inline void command_put(struct command *cmd)
 {
 	unsigned long flags;
 	spinlock_t *lock = cmd->lock;
 
 	spin_lock_irqsave(lock, flags);
-	kobject_put(&cmd->kobj);
+	kref_put(&cmd->kref, ibmasm_free_command);
 	spin_unlock_irqrestore(lock, flags);
 }
 
 static inline void command_get(struct command *cmd)
 {
-	kobject_get(&cmd->kobj);
+	kref_get(&cmd->kref);
 }