edac: convert sysdev_class to a regular subsystem

After all sysdev classes are ported to regular driver core entities, the
sysdev implementation will be entirely removed from the kernel.

Cc: Doug Thompson <[e-mail]>
Cc: Paul Gortmaker <[e-mail]>
Cc: Lucas De Marchi <[e-mail]>
Cc: Borislav Petkov <[e-mail]>
Signed-off-by: Kay Sievers <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/edac/edac_core.h

···
 #include <linux/completion.h>
 #include <linux/kobject.h>
 #include <linux/platform_device.h>
-#include <linux/sysdev.h>
 #include <linux/workqueue.h>
 #include <linux/edac.h>
 
···
 	 */
 	struct edac_dev_sysfs_attribute *sysfs_attributes;
 
-	/* pointer to main 'edac' class in sysfs */
-	struct sysdev_class *edac_class;
+	/* pointer to main 'edac' subsys in sysfs */
+	struct bus_type *edac_subsys;
 
 	/* the internal state of this controller instance */
 	int op_state;
···
 
 	int pci_idx;
 
-	struct sysdev_class *edac_class;	/* pointer to class */
+	struct bus_type *edac_subsys;	/* pointer to subsystem */
 
 	/* the internal state of this controller instance */
 	int op_state;

drivers/edac/edac_device.c

···
 #include <linux/jiffies.h>
 #include <linux/spinlock.h>
 #include <linux/list.h>
-#include <linux/sysdev.h>
 #include <linux/ctype.h>
 #include <linux/workqueue.h>
 #include <asm/uaccess.h>

drivers/edac/edac_device_sysfs.c

···
 /*
- * file for managing the edac_device class of devices for EDAC
+ * file for managing the edac_device subsystem of devices for EDAC
  *
  * (C) 2007 SoftwareBitMaker 
  *
···
  */
 int edac_device_register_sysfs_main_kobj(struct edac_device_ctl_info *edac_dev)
 {
-	struct sysdev_class *edac_class;
+	struct bus_type *edac_subsys;
 	int err;
 
 	debugf1("%s()\n", __func__);
 
 	/* get the /sys/devices/system/edac reference */
-	edac_class = edac_get_sysfs_class();
-	if (edac_class == NULL) {
-		debugf1("%s() no edac_class error\n", __func__);
+	edac_subsys = edac_get_sysfs_subsys();
+	if (edac_subsys == NULL) {
+		debugf1("%s() no edac_subsys error\n", __func__);
 		err = -ENODEV;
 		goto err_out;
 	}
 
-	/* Point to the 'edac_class' this instance 'reports' to */
-	edac_dev->edac_class = edac_class;
+	/* Point to the 'edac_subsys' this instance 'reports' to */
+	edac_dev->edac_subsys = edac_subsys;
 
 	/* Init the devices's kobject */
 	memset(&edac_dev->kobj, 0, sizeof(struct kobject));
···
 
 	/* register */
 	err = kobject_init_and_add(&edac_dev->kobj, &ktype_device_ctrl,
-				   &edac_class->kset.kobj,
+				   &edac_subsys->dev_root->kobj,
 				   "%s", edac_dev->name);
 	if (err) {
 		debugf1("%s()Failed to register '.../edac/%s'\n",
···
 	module_put(edac_dev->owner);
 
 err_mod_get:
-	edac_put_sysfs_class();
+	edac_put_sysfs_subsys();
 
 err_out:
 	return err;
···
 	 *   b) 'kfree' the memory
 	 */
 	kobject_put(&dev->kobj);
-	edac_put_sysfs_class();
+	edac_put_sysfs_subsys();
 }
 
 /* edac_dev -> instance information */

drivers/edac/edac_mc.c

···
 #include <linux/jiffies.h>
 #include <linux/spinlock.h>
 #include <linux/list.h>
-#include <linux/sysdev.h>
 #include <linux/ctype.h>
 #include <linux/edac.h>
 #include <asm/uaccess.h>

drivers/edac/edac_mc_sysfs.c

···
 int edac_sysfs_setup_mc_kset(void)
 {
 	int err = -EINVAL;
-	struct sysdev_class *edac_class;
+	struct bus_type *edac_subsys;
 
 	debugf1("%s()\n", __func__);
 
-	/* get the /sys/devices/system/edac class reference */
-	edac_class = edac_get_sysfs_class();
-	if (edac_class == NULL) {
-		debugf1("%s() no edac_class error=%d\n", __func__, err);
+	/* get the /sys/devices/system/edac subsys reference */
+	edac_subsys = edac_get_sysfs_subsys();
+	if (edac_subsys == NULL) {
+		debugf1("%s() no edac_subsys error=%d\n", __func__, err);
 		goto fail_out;
 	}
 
 	/* Init the MC's kobject */
-	mc_kset = kset_create_and_add("mc", NULL, &edac_class->kset.kobj);
+	mc_kset = kset_create_and_add("mc", NULL, &edac_subsys->dev_root->kobj);
 	if (!mc_kset) {
 		err = -ENOMEM;
 		debugf1("%s() Failed to register '.../edac/mc'\n", __func__);
···
 	return 0;
 
 fail_kset:
-	edac_put_sysfs_class();
+	edac_put_sysfs_subsys();
 
 fail_out:
 	return err;
···
 void edac_sysfs_teardown_mc_kset(void)
 {
 	kset_unregister(mc_kset);
-	edac_put_sysfs_class();
+	edac_put_sysfs_subsys();
 }
 

drivers/edac/edac_module.h

···
 #ifndef	__EDAC_MODULE_H__
 #define	__EDAC_MODULE_H__
 
-#include <linux/sysdev.h>
-
 #include "edac_core.h"
 
 /*

drivers/edac/edac_pci.c

···
 #include <linux/slab.h>
 #include <linux/spinlock.h>
 #include <linux/list.h>
-#include <linux/sysdev.h>
 #include <linux/ctype.h>
 #include <linux/workqueue.h>
 #include <asm/uaccess.h>

drivers/edac/edac_pci_sysfs.c

···
  * edac_pci_main_kobj_setup()
  *
  *	setup the sysfs for EDAC PCI attributes
- *	assumes edac_class has already been initialized
+ *	assumes edac_subsys has already been initialized
  */
 static int edac_pci_main_kobj_setup(void)
 {
 	int err;
-	struct sysdev_class *edac_class;
+	struct bus_type *edac_subsys;
 
 	debugf0("%s()\n", __func__);
 
···
 	/* First time, so create the main kobject and its
 	 * controls and attributes
 	 */
-	edac_class = edac_get_sysfs_class();
-	if (edac_class == NULL) {
-		debugf1("%s() no edac_class\n", __func__);
+	edac_subsys = edac_get_sysfs_subsys();
+	if (edac_subsys == NULL) {
+		debugf1("%s() no edac_subsys\n", __func__);
 		err = -ENODEV;
 		goto decrement_count_fail;
 	}
···
 	/* Instanstiate the pci object */
 	err = kobject_init_and_add(edac_pci_top_main_kobj,
 				   &ktype_edac_pci_main_kobj,
-				   &edac_class->kset.kobj, "pci");
+				   &edac_subsys->dev_root->kobj, "pci");
 	if (err) {
 		debugf1("Failed to register '.../edac/pci'\n");
 		goto kobject_init_and_add_fail;
···
 	module_put(THIS_MODULE);
 
 mod_get_fail:
-	edac_put_sysfs_class();
+	edac_put_sysfs_subsys();
 
 decrement_count_fail:
 	/* if are on this error exit, nothing to tear down */
···
 			__func__);
 		kobject_put(edac_pci_top_main_kobj);
 	}
-	edac_put_sysfs_class();
+	edac_put_sysfs_subsys();
 }
 
 /*

drivers/edac/edac_stub.c

···
 int edac_err_assert = 0;
 EXPORT_SYMBOL_GPL(edac_err_assert);
 
-static atomic_t edac_class_valid = ATOMIC_INIT(0);
+static atomic_t edac_subsys_valid = ATOMIC_INIT(0);
 
 /*
  * called to determine if there is an EDAC driver interested in
···
  * sysfs object: /sys/devices/system/edac
  *	need to export to other files
  */
-struct sysdev_class edac_class = {
+struct bus_type edac_subsys = {
 	.name = "edac",
+	.dev_name = "edac",
 };
-EXPORT_SYMBOL_GPL(edac_class);
+EXPORT_SYMBOL_GPL(edac_subsys);
 
 /* return pointer to the 'edac' node in sysfs */
-struct sysdev_class *edac_get_sysfs_class(void)
+struct bus_type *edac_get_sysfs_subsys(void)
 {
 	int err = 0;
 
-	if (atomic_read(&edac_class_valid))
+	if (atomic_read(&edac_subsys_valid))
 		goto out;
 
 	/* create the /sys/devices/system/edac directory */
-	err = sysdev_class_register(&edac_class);
+	err = subsys_system_register(&edac_subsys, NULL);
 	if (err) {
 		printk(KERN_ERR "Error registering toplevel EDAC sysfs dir\n");
 		return NULL;
 	}
 
 out:
-	atomic_inc(&edac_class_valid);
-	return &edac_class;
+	atomic_inc(&edac_subsys_valid);
+	return &edac_subsys;
 }
-EXPORT_SYMBOL_GPL(edac_get_sysfs_class);
+EXPORT_SYMBOL_GPL(edac_get_sysfs_subsys);
 
-void edac_put_sysfs_class(void)
+void edac_put_sysfs_subsys(void)
 {
 	/* last user unregisters it */
-	if (atomic_dec_and_test(&edac_class_valid))
-		sysdev_class_unregister(&edac_class);
+	if (atomic_dec_and_test(&edac_subsys_valid))
+		bus_unregister(&edac_subsys);
 }
-EXPORT_SYMBOL_GPL(edac_put_sysfs_class);
+EXPORT_SYMBOL_GPL(edac_put_sysfs_subsys);

drivers/edac/mce_amd_inj.c

···
  */
 
 #include <linux/kobject.h>
-#include <linux/sysdev.h>
 #include <linux/edac.h>
 #include <linux/module.h>
 #include <asm/mce.h>
···
 
 static int __init edac_init_mce_inject(void)
 {
-	struct sysdev_class *edac_class = NULL;
+	struct bus_type *edac_subsys = NULL;
 	int i, err = 0;
 
-	edac_class = edac_get_sysfs_class();
-	if (!edac_class)
+	edac_subsys = edac_get_sysfs_subsys();
+	if (!edac_subsys)
 		return -EINVAL;
 
-	mce_kobj = kobject_create_and_add("mce", &edac_class->kset.kobj);
+	mce_kobj = kobject_create_and_add("mce", &edac_subsys->dev_root->kobj);
 	if (!mce_kobj) {
 		printk(KERN_ERR "Error creating a mce kset.\n");
 		err = -ENOMEM;
···
 	kobject_del(mce_kobj);
 
 err_mce_kobj:
-	edac_put_sysfs_class();
+	edac_put_sysfs_subsys();
 
 	return err;
 }
···
 
 	kobject_del(mce_kobj);
 
-	edac_put_sysfs_class();
+	edac_put_sysfs_subsys();
 }
 
 module_init(edac_init_mce_inject);

include/linux/edac.h

···
 #define _LINUX_EDAC_H_
 
 #include <linux/atomic.h>
-#include <linux/sysdev.h>
+#include <linux/device.h>
 
 #define EDAC_OPSTATE_INVAL	-1
 #define EDAC_OPSTATE_POLL	0
···
 extern int edac_op_state;
 extern int edac_err_assert;
 extern atomic_t edac_handlers;
-extern struct sysdev_class edac_class;
+extern struct bus_type edac_subsys;
 
 extern int edac_handler_set(void);
 extern void edac_atomic_assert_error(void);
-extern struct sysdev_class *edac_get_sysfs_class(void);
-extern void edac_put_sysfs_class(void);
+extern struct bus_type *edac_get_sysfs_subsys(void);
+extern void edac_put_sysfs_subsys(void);
 
 static inline void opstate_init(void)
 {