X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=drivers%2Fedac%2Fedac_device_sysfs.c;h=53764577035f3f23d0e073991d368f99b8225479;hb=b2798bf0ec2cb5a17bfc1430c5ba6d971c436a03;hp=afb19050264670e594f821b43ba1bcb367bfe52c;hpb=e27e3dac651771fe3250f6305dee277bce29fc5d;p=linux-2.6

diff --git a/drivers/edac/edac_device_sysfs.c b/drivers/edac/edac_device_sysfs.c
index afb1905026..5376457703 100644
--- a/drivers/edac/edac_device_sysfs.c
+++ b/drivers/edac/edac_device_sysfs.c
@@ -1,7 +1,8 @@
 /*
  * file for managing the edac_device class of devices for EDAC
  *
- * (C) 2007 SoftwareBitMaker(http://www.softwarebitmaker.com)
+ * (C) 2007 SoftwareBitMaker (http://www.softwarebitmaker.com)
+ *
  * This file may be distributed under the terms of the
  * GNU General Public License.
  *
@@ -9,197 +10,83 @@
  *
  */
 
-#include <linux/module.h>
-#include <linux/sysdev.h>
 #include <linux/ctype.h>
+#include <linux/module.h>
 
 #include "edac_core.h"
 #include "edac_module.h"
 
-
 #define EDAC_DEVICE_SYMLINK	"device"
 
 #define to_edacdev(k) container_of(k, struct edac_device_ctl_info, kobj)
 #define to_edacdev_attr(a) container_of(a, struct edacdev_attribute, attr)
 
-#ifdef DKT
-
-static ssize_t edac_dev_ue_count_show(struct edac_device_ctl_info *edac_dev,
-					char *data)
-{
-	return sprintf(data,"%d\n", edac_dev->ue_count);
-}
-
-static ssize_t edac_dev_ce_count_show(struct edac_device_ctl_info *edac_dev,
-					char *data)
-{
-	return sprintf(data,"%d\n", edac_dev->ce_count);
-}
-
-static ssize_t edac_dev_seconds_show(struct edac_device_ctl_info *edac_dev,
-					char *data)
-{
-	return sprintf(data,"%ld\n", (jiffies - edac_dev->start_time) / HZ);
-}
-
-static ssize_t edac_dev_ctl_name_show(struct edac_device_ctl_info *edac_dev,
-					char *data)
-{
-	return sprintf(data,"%s\n", edac_dev->ctl_name);
-}
-
-
-struct edacdev_attribute {
-	struct attribute attr;
-	ssize_t (*show)(struct edac_device_ctl_info *,char *);
-	ssize_t (*store)(struct edac_device_ctl_info *, const char *,size_t);
-};
-
-
-/* EDAC DEVICE show/store functions for top most object */
-static ssize_t edacdev_show(struct kobject *kobj, struct attribute *attr,
-		char *buffer)
-{
-	struct edac_device_ctl_info *edac_dev = to_edacdev(kobj);
-	struct edacdev_attribute * edacdev_attr = to_edacdev_attr(attr);
-
-	if (edacdev_attr->show)
-		return edacdev_attr->show(edac_dev, buffer);
-
-	return -EIO;
-}
-
-static ssize_t edacdev_store(struct kobject *kobj, struct attribute *attr,
-		const char *buffer, size_t count)
-{
-	struct edac_device_ctl_info *edac_dev = to_edacdev(kobj);
-	struct edacdev_attribute * edacdev_attr = to_edacdev_attr(attr);
-
-	if (edacdev_attr->store)
-		return edacdev_attr->store(edac_dev, buffer, count);
-
-	return -EIO;
-}
-
-static struct sysfs_ops edac_dev_ops = {
-	.show = edacdev_show,
-	.store = edacdev_store
-};
-
-#define EDACDEV_ATTR(_name,_mode,_show,_store)			\
-static struct edacdev_attribute edac_dev_attr_##_name = {			\
-	.attr = {.name = __stringify(_name), .mode = _mode },	\
-	.show   = _show,					\
-	.store  = _store,					\
-};
-
-/* default Control file */
-EDACDEV_ATTR(reset_counters,S_IWUSR,NULL,edac_dev_reset_counters_store);
-
-/* default Attribute files */
-EDACDEV_ATTR(mc_name,S_IRUGO,edac_dev_ctl_name_show,NULL);
-EDACDEV_ATTR(seconds_since_reset,S_IRUGO,edac_dev_seconds_show,NULL);
-EDACDEV_ATTR(ue_count,S_IRUGO,edac_dev_ue_count_show,NULL);
-EDACDEV_ATTR(ce_count,S_IRUGO,edac_dev_ce_count_show,NULL);
-
-
-static struct edacdev_attribute *edacdev_attr[] = {
-	&edacdev_attr_reset_counters,
-	&edacdev_attr_mc_name,
-	&edacdev_attr_seconds_since_reset,
-	&edacdev_attr_ue_count,
-	&edacdev_attr_ce_count,
-	NULL
-};
-
-/*
- * Release of a Edac Device controlling instance
- */
-static void edac_dev_instance_release(struct kobject *kobj)
-{
-	struct edac_device_ctl_info *edac_dev;
-
-	edac_dev = to_edacdev(kobj);
-	debugf0("%s() idx=%d\n", __func__, edac_dev->dev_idx);
-	complete(&edac_dev->kobj_complete);
-}
-
-static struct kobj_type ktype_device = {
-	.release = edac_dev_instance_release,
-	.sysfs_ops = &edacdev_ops,
-	.default_attrs = (struct attribute **) edacdev_attr,
-};
-
-#endif
-
-/************************** edac_device sysfs code and data **************/
 
 /*
  * Set of edac_device_ctl_info attribute store/show functions
  */
 
 /* 'log_ue' */
-static ssize_t edac_device_ctl_log_ue_show(
-		struct edac_device_ctl_info *ctl_info, char *data)
+static ssize_t edac_device_ctl_log_ue_show(struct edac_device_ctl_info
+					*ctl_info, char *data)
 {
-        return sprintf(data,"%u\n", ctl_info->log_ue);
+	return sprintf(data, "%u\n", ctl_info->log_ue);
 }
 
-static ssize_t edac_device_ctl_log_ue_store(
-		struct edac_device_ctl_info *ctl_info,
-			const char *data,size_t count)
+static ssize_t edac_device_ctl_log_ue_store(struct edac_device_ctl_info
+					*ctl_info, const char *data,
+					size_t count)
 {
 	/* if parameter is zero, turn off flag, if non-zero turn on flag */
-	ctl_info->log_ue = (simple_strtoul(data,NULL,0) != 0);
+	ctl_info->log_ue = (simple_strtoul(data, NULL, 0) != 0);
 
-        return count;
+	return count;
 }
 
 /* 'log_ce' */
-static ssize_t edac_device_ctl_log_ce_show(
-		struct edac_device_ctl_info *ctl_info,char *data)
+static ssize_t edac_device_ctl_log_ce_show(struct edac_device_ctl_info
+					*ctl_info, char *data)
 {
-        return sprintf(data,"%u\n", ctl_info->log_ce);
+	return sprintf(data, "%u\n", ctl_info->log_ce);
 }
 
-static ssize_t edac_device_ctl_log_ce_store(
-		struct edac_device_ctl_info *ctl_info,
-			const char *data,size_t count)
+static ssize_t edac_device_ctl_log_ce_store(struct edac_device_ctl_info
+					*ctl_info, const char *data,
+					size_t count)
 {
 	/* if parameter is zero, turn off flag, if non-zero turn on flag */
-	ctl_info->log_ce = (simple_strtoul(data,NULL,0) != 0);
+	ctl_info->log_ce = (simple_strtoul(data, NULL, 0) != 0);
 
-        return count;
+	return count;
 }
 
-
 /* 'panic_on_ue' */
-static ssize_t edac_device_ctl_panic_on_ue_show(
-		struct edac_device_ctl_info *ctl_info, char *data)
+static ssize_t edac_device_ctl_panic_on_ue_show(struct edac_device_ctl_info
+						*ctl_info, char *data)
 {
-        return sprintf(data,"%u\n", ctl_info->panic_on_ue);
+	return sprintf(data, "%u\n", ctl_info->panic_on_ue);
 }
 
-static ssize_t edac_device_ctl_panic_on_ue_store(
-		struct edac_device_ctl_info *ctl_info,
-			const char *data,size_t count)
+static ssize_t edac_device_ctl_panic_on_ue_store(struct edac_device_ctl_info
+						 *ctl_info, const char *data,
+						 size_t count)
 {
 	/* if parameter is zero, turn off flag, if non-zero turn on flag */
-	ctl_info->panic_on_ue = (simple_strtoul(data,NULL,0) != 0);
+	ctl_info->panic_on_ue = (simple_strtoul(data, NULL, 0) != 0);
 
 	return count;
 }
 
 /* 'poll_msec' show and store functions*/
-static ssize_t edac_device_ctl_poll_msec_show(
-		struct edac_device_ctl_info *ctl_info, char *data)
+static ssize_t edac_device_ctl_poll_msec_show(struct edac_device_ctl_info
+					*ctl_info, char *data)
 {
-        return sprintf(data,"%u\n", ctl_info->poll_msec);
+	return sprintf(data, "%u\n", ctl_info->poll_msec);
 }
 
-static ssize_t edac_device_ctl_poll_msec_store(
-		struct edac_device_ctl_info *ctl_info,
-		const char *data,size_t count)
+static ssize_t edac_device_ctl_poll_msec_store(struct edac_device_ctl_info
+					*ctl_info, const char *data,
+					size_t count)
 {
 	unsigned long value;
 
@@ -208,18 +95,17 @@ static ssize_t edac_device_ctl_poll_msec_store(
 	 * Then cancel last outstanding delay for the work request
 	 * and set a new one.
 	 */
-	value = simple_strtoul(data,NULL,0);
-	edac_device_reset_delay_period(ctl_info,value);
+	value = simple_strtoul(data, NULL, 0);
+	edac_device_reset_delay_period(ctl_info, value);
 
-        return count;
+	return count;
 }
 
-
 /* edac_device_ctl_info specific attribute structure */
 struct ctl_info_attribute {
-        struct attribute attr;
-        ssize_t (*show)(struct edac_device_ctl_info *,char *);
-        ssize_t (*store)(struct edac_device_ctl_info *,const char *,size_t);
+	struct attribute attr;
+	ssize_t(*show) (struct edac_device_ctl_info *, char *);
+	ssize_t(*store) (struct edac_device_ctl_info *, const char *, size_t);
 };
 
 #define to_ctl_info(k) container_of(k, struct edac_device_ctl_info, kobj)
@@ -227,58 +113,52 @@ struct ctl_info_attribute {
 
 /* Function to 'show' fields from the edac_dev 'ctl_info' structure */
 static ssize_t edac_dev_ctl_info_show(struct kobject *kobj,
-                        struct attribute *attr,
-                        char *buffer)
+				struct attribute *attr, char *buffer)
 {
-        struct edac_device_ctl_info *edac_dev = to_ctl_info(kobj);
-        struct ctl_info_attribute *ctl_info_attr = to_ctl_info_attr(attr);
+	struct edac_device_ctl_info *edac_dev = to_ctl_info(kobj);
+	struct ctl_info_attribute *ctl_info_attr = to_ctl_info_attr(attr);
 
-        if (ctl_info_attr->show)
-                return ctl_info_attr->show(edac_dev,buffer);
-        return -EIO;
+	if (ctl_info_attr->show)
+		return ctl_info_attr->show(edac_dev, buffer);
+	return -EIO;
 }
 
 /* Function to 'store' fields into the edac_dev 'ctl_info' structure */
 static ssize_t edac_dev_ctl_info_store(struct kobject *kobj,
-                        struct attribute *attr,
-                	const char *buffer, size_t count)
+				struct attribute *attr,
+				const char *buffer, size_t count)
 {
-        struct edac_device_ctl_info *edac_dev = to_ctl_info(kobj);
-        struct ctl_info_attribute *ctl_info_attr = to_ctl_info_attr(attr);
+	struct edac_device_ctl_info *edac_dev = to_ctl_info(kobj);
+	struct ctl_info_attribute *ctl_info_attr = to_ctl_info_attr(attr);
 
-        if (ctl_info_attr->store)
-                return ctl_info_attr->store(edac_dev, buffer, count);
-        return -EIO;
+	if (ctl_info_attr->store)
+		return ctl_info_attr->store(edac_dev, buffer, count);
+	return -EIO;
 }
 
 /* edac_dev file operations for an 'ctl_info' */
 static struct sysfs_ops device_ctl_info_ops = {
-	.show   = edac_dev_ctl_info_show,
-	.store  = edac_dev_ctl_info_store
+	.show = edac_dev_ctl_info_show,
+	.store = edac_dev_ctl_info_store
 };
 
 #define CTL_INFO_ATTR(_name,_mode,_show,_store)        \
 static struct ctl_info_attribute attr_ctl_info_##_name = {      \
-        .attr = {.name = __stringify(_name), .mode = _mode },   \
-        .show   = _show,                                        \
-        .store  = _store,                                       \
+	.attr = {.name = __stringify(_name), .mode = _mode },   \
+	.show   = _show,                                        \
+	.store  = _store,                                       \
 };
 
-
 /* Declare the various ctl_info attributes here and their respective ops */
-CTL_INFO_ATTR(log_ue,S_IRUGO|S_IWUSR,
-		edac_device_ctl_log_ue_show,
-		edac_device_ctl_log_ue_store);
-CTL_INFO_ATTR(log_ce,S_IRUGO|S_IWUSR,
-		edac_device_ctl_log_ce_show,
-		edac_device_ctl_log_ce_store);
-CTL_INFO_ATTR(panic_on_ue,S_IRUGO|S_IWUSR,
-		edac_device_ctl_panic_on_ue_show,
-		edac_device_ctl_panic_on_ue_store);
-CTL_INFO_ATTR(poll_msec,S_IRUGO|S_IWUSR,
-		edac_device_ctl_poll_msec_show,
-		edac_device_ctl_poll_msec_store);
-
+CTL_INFO_ATTR(log_ue, S_IRUGO | S_IWUSR,
+	edac_device_ctl_log_ue_show, edac_device_ctl_log_ue_store);
+CTL_INFO_ATTR(log_ce, S_IRUGO | S_IWUSR,
+	edac_device_ctl_log_ce_show, edac_device_ctl_log_ce_store);
+CTL_INFO_ATTR(panic_on_ue, S_IRUGO | S_IWUSR,
+	edac_device_ctl_panic_on_ue_show,
+	edac_device_ctl_panic_on_ue_store);
+CTL_INFO_ATTR(poll_msec, S_IRUGO | S_IWUSR,
+	edac_device_ctl_poll_msec_show, edac_device_ctl_poll_msec_store);
 
 /* Base Attributes of the EDAC_DEVICE ECC object */
 static struct ctl_info_attribute *device_ctrl_attr[] = {
@@ -289,119 +169,160 @@ static struct ctl_info_attribute *device_ctrl_attr[] = {
 	NULL,
 };
 
-/* Main DEVICE kobject release() function */
+/*
+ * edac_device_ctrl_master_release
+ *
+ *	called when the reference count for the 'main' kobj
+ *	for a edac_device control struct reaches zero
+ *
+ *	Reference count model:
+ *		One 'main' kobject for each control structure allocated.
+ *		That main kobj is initially set to one AND
+ *		the reference count for the EDAC 'core' module is
+ *		bumped by one, thus added 'keep in memory' dependency.
+ *
+ *		Each new internal kobj (in instances and blocks) then
+ *		bumps the 'main' kobject.
+ *
+ *		When they are released their release functions decrement
+ *		the 'main' kobj.
+ *
+ *		When the main kobj reaches zero (0) then THIS function
+ *		is called which then decrements the EDAC 'core' module.
+ *		When the module reference count reaches zero then the
+ *		module no longer has dependency on keeping the release
+ *		function code in memory and module can be unloaded.
+ *
+ *		This will support several control objects as well, each
+ *		with its own 'main' kobj.
+ */
 static void edac_device_ctrl_master_release(struct kobject *kobj)
 {
-	struct edac_device_ctl_info *edac_dev;
+	struct edac_device_ctl_info *edac_dev = to_edacdev(kobj);
 
-	edac_dev = to_edacdev(kobj);
+	debugf4("%s() control index=%d\n", __func__, edac_dev->dev_idx);
 
-	debugf1("%s()\n", __func__);
-	complete(&edac_dev->kobj_complete);
+	/* decrement the EDAC CORE module ref count */
+	module_put(edac_dev->owner);
+
+	/* free the control struct containing the 'main' kobj
+	 * passed in to this routine
+	 */
+	kfree(edac_dev);
 }
 
+/* ktype for the main (master) kobject */
 static struct kobj_type ktype_device_ctrl = {
 	.release = edac_device_ctrl_master_release,
 	.sysfs_ops = &device_ctl_info_ops,
-	.default_attrs = (struct attribute **) device_ctrl_attr,
+	.default_attrs = (struct attribute **)device_ctrl_attr,
 };
 
-
-/**************** edac_device main kobj ctor/dtor code *********************/
-
 /*
- * edac_device_register_main_kobj
+ * edac_device_register_sysfs_main_kobj
  *
  *	perform the high level setup for the new edac_device instance
  *
  * Return:  0 SUCCESS
  *         !0 FAILURE
  */
-static int edac_device_register_main_kobj(
-		struct edac_device_ctl_info *edac_dev)
+int edac_device_register_sysfs_main_kobj(struct edac_device_ctl_info *edac_dev)
 {
-	int err = 0;
 	struct sysdev_class *edac_class;
+	int err;
 
 	debugf1("%s()\n", __func__);
 
-        /* get the /sys/devices/system/edac reference */
-        edac_class = edac_get_edac_class();
-        if (edac_class == NULL) {
-                debugf1("%s() no edac_class error=%d\n", __func__, err);
-                return err;
-        }
+	/* get the /sys/devices/system/edac reference */
+	edac_class = edac_get_edac_class();
+	if (edac_class == NULL) {
+		debugf1("%s() no edac_class error\n", __func__);
+		err = -ENODEV;
+		goto err_out;
+	}
 
 	/* Point to the 'edac_class' this instance 'reports' to */
 	edac_dev->edac_class = edac_class;
 
 	/* Init the devices's kobject */
-	memset(&edac_dev->kobj, 0, sizeof (struct kobject));
-	edac_dev->kobj.ktype = &ktype_device_ctrl;
+	memset(&edac_dev->kobj, 0, sizeof(struct kobject));
 
-	/* set this new device under the edac_class kobject */
-	edac_dev->kobj.parent = &edac_class->kset.kobj;
+	/* Record which module 'owns' this control structure
+	 * and bump the ref count of the module
+	 */
+	edac_dev->owner = THIS_MODULE;
 
-	/* generate sysfs "..../edac/<name>"   */
-	debugf1("%s() set name of kobject to: %s\n",
-		__func__, edac_dev->name);
-	err = kobject_set_name(&edac_dev->kobj,"%s",edac_dev->name);
-	if (err)
-		return err;
-	err = kobject_register(&edac_dev->kobj);
+	if (!try_module_get(edac_dev->owner)) {
+		err = -ENODEV;
+		goto err_out;
+	}
+
+	/* register */
+	err = kobject_init_and_add(&edac_dev->kobj, &ktype_device_ctrl,
+				   &edac_class->kset.kobj,
+				   "%s", edac_dev->name);
 	if (err) {
 		debugf1("%s()Failed to register '.../edac/%s'\n",
-			__func__,edac_dev->name);
-		return err;
+			__func__, edac_dev->name);
+		goto err_kobj_reg;
 	}
+	kobject_uevent(&edac_dev->kobj, KOBJ_ADD);
+
+	/* At this point, to 'free' the control struct,
+	 * edac_device_unregister_sysfs_main_kobj() must be used
+	 */
 
-	debugf1("%s() Registered '.../edac/%s' kobject\n",
+	debugf4("%s() Registered '.../edac/%s' kobject\n",
 		__func__, edac_dev->name);
 
 	return 0;
+
+	/* Error exit stack */
+err_kobj_reg:
+	module_put(edac_dev->owner);
+
+err_out:
+	return err;
 }
 
 /*
- * edac_device_unregister_main_kobj:
+ * edac_device_unregister_sysfs_main_kobj:
  *	the '..../edac/<name>' kobject
  */
-static void edac_device_unregister_main_kobj(
-			struct edac_device_ctl_info *edac_dev)
+void edac_device_unregister_sysfs_main_kobj(
+					struct edac_device_ctl_info *edac_dev)
 {
 	debugf0("%s()\n", __func__);
-	debugf1("%s() name of kobject is: %s\n",
+	debugf4("%s() name of kobject is: %s\n",
 		__func__, kobject_name(&edac_dev->kobj));
 
-	init_completion(&edac_dev->kobj_complete);
-
 	/*
 	 * Unregister the edac device's kobject and
-	 * wait for reference count to reach 0.
+	 * allow for reference count to reach 0 at which point
+	 * the callback will be called to:
+	 *   a) module_put() this module
+	 *   b) 'kfree' the memory
 	 */
-	kobject_unregister(&edac_dev->kobj);
-	wait_for_completion(&edac_dev->kobj_complete);
+	kobject_put(&edac_dev->kobj);
 }
 
-
-/*************** edac_dev -> instance information ***********/
+/* edac_dev -> instance information */
 
 /*
  * Set of low-level instance attribute show functions
  */
-static ssize_t instance_ue_count_show(
-		struct edac_device_instance *instance, char *data)
+static ssize_t instance_ue_count_show(struct edac_device_instance *instance,
+				char *data)
 {
-        return sprintf(data,"%u\n", instance->counters.ue_count);
+	return sprintf(data, "%u\n", instance->counters.ue_count);
 }
 
-static ssize_t instance_ce_count_show(
-		struct edac_device_instance *instance, char *data)
+static ssize_t instance_ce_count_show(struct edac_device_instance *instance,
+				char *data)
 {
-        return sprintf(data,"%u\n", instance->counters.ce_count);
+	return sprintf(data, "%u\n", instance->counters.ce_count);
 }
 
-
-
 #define to_instance(k) container_of(k, struct edac_device_instance, kobj)
 #define to_instance_attr(a) container_of(a,struct instance_attribute,attr)
 
@@ -412,59 +333,56 @@ static void edac_device_ctrl_instance_release(struct kobject *kobj)
 
 	debugf1("%s()\n", __func__);
 
+	/* map from this kobj to the main control struct
+	 * and then dec the main kobj count
+	 */
 	instance = to_instance(kobj);
-	complete(&instance->kobj_complete);
+	kobject_put(&instance->ctl->kobj);
 }
 
-
 /* instance specific attribute structure */
 struct instance_attribute {
-        struct attribute attr;
-        ssize_t (*show)(struct edac_device_instance *,char *);
-        ssize_t (*store)(struct edac_device_instance *,const char *,size_t);
+	struct attribute attr;
+	ssize_t(*show) (struct edac_device_instance *, char *);
+	ssize_t(*store) (struct edac_device_instance *, const char *, size_t);
 };
 
-
 /* Function to 'show' fields from the edac_dev 'instance' structure */
 static ssize_t edac_dev_instance_show(struct kobject *kobj,
-                        struct attribute *attr,
-                        char *buffer)
+				struct attribute *attr, char *buffer)
 {
-        struct edac_device_instance *instance = to_instance(kobj);
-        struct instance_attribute *instance_attr = to_instance_attr(attr);
+	struct edac_device_instance *instance = to_instance(kobj);
+	struct instance_attribute *instance_attr = to_instance_attr(attr);
 
-        if (instance_attr->show)
-                return instance_attr->show(instance,buffer);
-        return -EIO;
+	if (instance_attr->show)
+		return instance_attr->show(instance, buffer);
+	return -EIO;
 }
 
-
 /* Function to 'store' fields into the edac_dev 'instance' structure */
 static ssize_t edac_dev_instance_store(struct kobject *kobj,
-                        struct attribute *attr,
-                	const char *buffer, size_t count)
+				struct attribute *attr,
+				const char *buffer, size_t count)
 {
-        struct edac_device_instance *instance = to_instance(kobj);
-        struct instance_attribute *instance_attr = to_instance_attr(attr);
+	struct edac_device_instance *instance = to_instance(kobj);
+	struct instance_attribute *instance_attr = to_instance_attr(attr);
 
-        if (instance_attr->store)
-                return instance_attr->store(instance, buffer, count);
-        return -EIO;
+	if (instance_attr->store)
+		return instance_attr->store(instance, buffer, count);
+	return -EIO;
 }
 
-
-
 /* edac_dev file operations for an 'instance' */
 static struct sysfs_ops device_instance_ops = {
-	.show   = edac_dev_instance_show,
-	.store  = edac_dev_instance_store
+	.show = edac_dev_instance_show,
+	.store = edac_dev_instance_store
 };
 
 #define INSTANCE_ATTR(_name,_mode,_show,_store)        \
 static struct instance_attribute attr_instance_##_name = {      \
-        .attr = {.name = __stringify(_name), .mode = _mode },   \
-        .show   = _show,                                        \
-        .store  = _store,                                       \
+	.attr = {.name = __stringify(_name), .mode = _mode },   \
+	.show   = _show,                                        \
+	.store  = _store,                                       \
 };
 
 /*
@@ -472,8 +390,8 @@ static struct instance_attribute attr_instance_##_name = {      \
  *	Each contains a pointer to a show and an optional set
  *	function pointer that does the low level output/input
  */
-INSTANCE_ATTR(ce_count,S_IRUGO,instance_ce_count_show,NULL);
-INSTANCE_ATTR(ue_count,S_IRUGO,instance_ue_count_show,NULL);
+INSTANCE_ATTR(ce_count, S_IRUGO, instance_ce_count_show, NULL);
+INSTANCE_ATTR(ue_count, S_IRUGO, instance_ue_count_show, NULL);
 
 /* list of edac_dev 'instance' attributes */
 static struct instance_attribute *device_instance_attr[] = {
@@ -486,31 +404,33 @@ static struct instance_attribute *device_instance_attr[] = {
 static struct kobj_type ktype_instance_ctrl = {
 	.release = edac_device_ctrl_instance_release,
 	.sysfs_ops = &device_instance_ops,
-	.default_attrs = (struct attribute **) device_instance_attr,
+	.default_attrs = (struct attribute **)device_instance_attr,
 };
 
+/* edac_dev -> instance -> block information */
 
-/*************** edac_dev -> instance -> block information *********/
+#define to_block(k) container_of(k, struct edac_device_block, kobj)
+#define to_block_attr(a) \
+	container_of(a, struct edac_dev_sysfs_block_attribute, attr)
 
 /*
  * Set of low-level block attribute show functions
  */
-static ssize_t block_ue_count_show(
-		struct edac_device_block *block, char *data)
+static ssize_t block_ue_count_show(struct kobject *kobj,
+					struct attribute *attr, char *data)
 {
-        return sprintf(data,"%u\n", block->counters.ue_count);
-}
+	struct edac_device_block *block = to_block(kobj);
 
-static ssize_t block_ce_count_show(
-		struct edac_device_block *block, char *data)
-{
-        return sprintf(data,"%u\n", block->counters.ce_count);
+	return sprintf(data, "%u\n", block->counters.ue_count);
 }
 
+static ssize_t block_ce_count_show(struct kobject *kobj,
+					struct attribute *attr, char *data)
+{
+	struct edac_device_block *block = to_block(kobj);
 
-
-#define to_block(k) container_of(k, struct edac_device_block, kobj)
-#define to_block_attr(a) container_of(a,struct block_attribute,attr)
+	return sprintf(data, "%u\n", block->counters.ce_count);
+}
 
 /* DEVICE block kobject release() function */
 static void edac_device_ctrl_block_release(struct kobject *kobj)
@@ -519,65 +439,60 @@ static void edac_device_ctrl_block_release(struct kobject *kobj)
 
 	debugf1("%s()\n", __func__);
 
+	/* get the container of the kobj */
 	block = to_block(kobj);
-	complete(&block->kobj_complete);
+
+	/* map from 'block kobj' to 'block->instance->controller->main_kobj'
+	 * now 'release' the block kobject
+	 */
+	kobject_put(&block->instance->ctl->kobj);
 }
 
-/* block specific attribute structure */
-struct block_attribute {
-        struct attribute attr;
-        ssize_t (*show)(struct edac_device_block *,char *);
-        ssize_t (*store)(struct edac_device_block *,const char *,size_t);
-};
 
 /* Function to 'show' fields from the edac_dev 'block' structure */
 static ssize_t edac_dev_block_show(struct kobject *kobj,
-                        struct attribute *attr,
-                        char *buffer)
+				struct attribute *attr, char *buffer)
 {
-        struct edac_device_block *block = to_block(kobj);
-        struct block_attribute *block_attr = to_block_attr(attr);
+	struct edac_dev_sysfs_block_attribute *block_attr =
+						to_block_attr(attr);
 
-        if (block_attr->show)
-                return block_attr->show(block,buffer);
-        return -EIO;
+	if (block_attr->show)
+		return block_attr->show(kobj, attr, buffer);
+	return -EIO;
 }
 
-
 /* Function to 'store' fields into the edac_dev 'block' structure */
 static ssize_t edac_dev_block_store(struct kobject *kobj,
-                        struct attribute *attr,
-                	const char *buffer, size_t count)
+				struct attribute *attr,
+				const char *buffer, size_t count)
 {
-        struct edac_device_block *block = to_block(kobj);
-        struct block_attribute *block_attr = to_block_attr(attr);
+	struct edac_dev_sysfs_block_attribute *block_attr;
 
-        if (block_attr->store)
-                return block_attr->store(block, buffer, count);
-        return -EIO;
-}
+	block_attr = to_block_attr(attr);
 
+	if (block_attr->store)
+		return block_attr->store(kobj, attr, buffer, count);
+	return -EIO;
+}
 
 /* edac_dev file operations for a 'block' */
 static struct sysfs_ops device_block_ops = {
-	.show   = edac_dev_block_show,
-	.store  = edac_dev_block_store
+	.show = edac_dev_block_show,
+	.store = edac_dev_block_store
 };
 
-
 #define BLOCK_ATTR(_name,_mode,_show,_store)        \
-static struct block_attribute attr_block_##_name = {                       \
-        .attr = {.name = __stringify(_name), .mode = _mode },   \
-        .show   = _show,                                        \
-        .store  = _store,                                       \
+static struct edac_dev_sysfs_block_attribute attr_block_##_name = {	\
+	.attr = {.name = __stringify(_name), .mode = _mode },   \
+	.show   = _show,                                        \
+	.store  = _store,                                       \
 };
 
-BLOCK_ATTR(ce_count,S_IRUGO,block_ce_count_show,NULL);
-BLOCK_ATTR(ue_count,S_IRUGO,block_ue_count_show,NULL);
-
+BLOCK_ATTR(ce_count, S_IRUGO, block_ce_count_show, NULL);
+BLOCK_ATTR(ue_count, S_IRUGO, block_ue_count_show, NULL);
 
 /* list of edac_dev 'block' attributes */
-static struct block_attribute *device_block_attr[] = {
+static struct edac_dev_sysfs_block_attribute *device_block_attr[] = {
 	&attr_block_ce_count,
 	&attr_block_ue_count,
 	NULL,
@@ -587,139 +502,202 @@ static struct block_attribute *device_block_attr[] = {
 static struct kobj_type ktype_block_ctrl = {
 	.release = edac_device_ctrl_block_release,
 	.sysfs_ops = &device_block_ops,
-	.default_attrs = (struct attribute **) device_block_attr,
+	.default_attrs = (struct attribute **)device_block_attr,
 };
 
-
-/************** block ctor/dtor  code ************/
+/* block ctor/dtor  code */
 
 /*
  * edac_device_create_block
  */
-static int edac_device_create_block(
-		struct edac_device_ctl_info *edac_dev,
-		struct edac_device_instance *instance,
-		int idx)
+static int edac_device_create_block(struct edac_device_ctl_info *edac_dev,
+				struct edac_device_instance *instance,
+				struct edac_device_block *block)
 {
+	int i;
 	int err;
-	struct edac_device_block *block;
-
-	block = &instance->blocks[idx];
+	struct edac_dev_sysfs_block_attribute *sysfs_attrib;
+	struct kobject *main_kobj;
 
-	debugf1("%s() Instance '%s' block[%d] '%s'\n",
-		__func__,instance->name, idx, block->name);
+	debugf4("%s() Instance '%s' inst_p=%p  block '%s'  block_p=%p\n",
+		__func__, instance->name, instance, block->name, block);
+	debugf4("%s() block kobj=%p  block kobj->parent=%p\n",
+		__func__, &block->kobj, &block->kobj.parent);
 
 	/* init this block's kobject */
-	memset(&block->kobj, 0, sizeof (struct kobject));
-	block->kobj.parent = &instance->kobj;
-	block->kobj.ktype = &ktype_block_ctrl;
+	memset(&block->kobj, 0, sizeof(struct kobject));
 
-	err = kobject_set_name(&block->kobj,"%s",block->name);
-	if (err)
-		return err;
+	/* bump the main kobject's reference count for this controller
+	 * and this instance is dependant on the main
+	 */
+	main_kobj = kobject_get(&edac_dev->kobj);
+	if (!main_kobj) {
+		err = -ENODEV;
+		goto err_out;
+	}
 
-	err = kobject_register(&block->kobj);
+	/* Add this block's kobject */
+	err = kobject_init_and_add(&block->kobj, &ktype_block_ctrl,
+				   &instance->kobj,
+				   "%s", block->name);
 	if (err) {
-		debugf1("%s()Failed to register instance '%s'\n",
-			__func__,block->name);
-		return err;
+		debugf1("%s() Failed to register instance '%s'\n",
+			__func__, block->name);
+		kobject_put(main_kobj);
+		err = -ENODEV;
+		goto err_out;
+	}
+
+	/* If there are driver level block attributes, then added them
+	 * to the block kobject
+	 */
+	sysfs_attrib = block->block_attributes;
+	if (sysfs_attrib && block->nr_attribs) {
+		for (i = 0; i < block->nr_attribs; i++, sysfs_attrib++) {
+
+			debugf4("%s() creating block attrib='%s' "
+				"attrib->%p to kobj=%p\n",
+				__func__,
+				sysfs_attrib->attr.name,
+				sysfs_attrib, &block->kobj);
+
+			/* Create each block_attribute file */
+			err = sysfs_create_file(&block->kobj,
+				&sysfs_attrib->attr);
+			if (err)
+				goto err_on_attrib;
+		}
 	}
+	kobject_uevent(&block->kobj, KOBJ_ADD);
 
 	return 0;
+
+	/* Error unwind stack */
+err_on_attrib:
+	kobject_put(&block->kobj);
+
+err_out:
+	return err;
 }
 
 /*
- * edac_device_delete_block(edac_dev,j);
+ * edac_device_delete_block(edac_dev,block);
  */
-static void edac_device_delete_block(
-		struct edac_device_ctl_info *edac_dev,
-		struct edac_device_instance *instance,
-		int idx)
+static void edac_device_delete_block(struct edac_device_ctl_info *edac_dev,
+				struct edac_device_block *block)
 {
-	struct edac_device_block *block;
+	struct edac_dev_sysfs_block_attribute *sysfs_attrib;
+	int i;
 
-	block = &instance->blocks[idx];
+	/* if this block has 'attributes' then we need to iterate over the list
+	 * and 'remove' the attributes on this block
+	 */
+	sysfs_attrib = block->block_attributes;
+	if (sysfs_attrib && block->nr_attribs) {
+		for (i = 0; i < block->nr_attribs; i++, sysfs_attrib++) {
+
+			/* remove each block_attrib file */
+			sysfs_remove_file(&block->kobj,
+				(struct attribute *) sysfs_attrib);
+		}
+	}
 
-	/* unregister this block's kobject */
-	init_completion(&block->kobj_complete);
-	kobject_unregister(&block->kobj);
-	wait_for_completion(&block->kobj_complete);
+	/* unregister this block's kobject, SEE:
+	 *	edac_device_ctrl_block_release() callback operation
+	 */
+	kobject_put(&block->kobj);
 }
 
-/************** instance ctor/dtor  code ************/
+/* instance ctor/dtor code */
 
 /*
  * edac_device_create_instance
  *	create just one instance of an edac_device 'instance'
  */
-static int edac_device_create_instance(
-		struct edac_device_ctl_info *edac_dev, int idx)
+static int edac_device_create_instance(struct edac_device_ctl_info *edac_dev,
+				int idx)
 {
 	int i, j;
 	int err;
 	struct edac_device_instance *instance;
+	struct kobject *main_kobj;
 
 	instance = &edac_dev->instances[idx];
 
 	/* Init the instance's kobject */
-	memset(&instance->kobj, 0, sizeof (struct kobject));
+	memset(&instance->kobj, 0, sizeof(struct kobject));
 
-	/* set this new device under the edac_device main kobject */
-	instance->kobj.parent = &edac_dev->kobj;
-	instance->kobj.ktype = &ktype_instance_ctrl;
+	instance->ctl = edac_dev;
 
-	err = kobject_set_name(&instance->kobj,"%s",instance->name);
-	if (err)
-		return err;
+	/* bump the main kobject's reference count for this controller
+	 * and this instance is dependant on the main
+	 */
+	main_kobj = kobject_get(&edac_dev->kobj);
+	if (!main_kobj) {
+		err = -ENODEV;
+		goto err_out;
+	}
 
-	err = kobject_register(&instance->kobj);
+	/* Formally register this instance's kobject under the edac_device */
+	err = kobject_init_and_add(&instance->kobj, &ktype_instance_ctrl,
+				   &edac_dev->kobj, "%s", instance->name);
 	if (err != 0) {
 		debugf2("%s() Failed to register instance '%s'\n",
-			__func__,instance->name);
-		return err;
+			__func__, instance->name);
+		kobject_put(main_kobj);
+		goto err_out;
 	}
 
-	debugf1("%s() now register '%d' blocks for instance %d\n",
-			__func__,instance->nr_blocks,idx);
+	debugf4("%s() now register '%d' blocks for instance %d\n",
+		__func__, instance->nr_blocks, idx);
 
 	/* register all blocks of this instance */
-	for (i = 0; i < instance->nr_blocks; i++ ) {
-		err = edac_device_create_block(edac_dev,instance,i);
+	for (i = 0; i < instance->nr_blocks; i++) {
+		err = edac_device_create_block(edac_dev, instance,
+						&instance->blocks[i]);
 		if (err) {
-			for (j = 0; j < i; j++) {
-				edac_device_delete_block(edac_dev,instance,j);
-			}
-			return err;
+			/* If any fail, remove all previous ones */
+			for (j = 0; j < i; j++)
+				edac_device_delete_block(edac_dev,
+							&instance->blocks[j]);
+			goto err_release_instance_kobj;
 		}
 	}
+	kobject_uevent(&instance->kobj, KOBJ_ADD);
 
-	debugf1("%s() Registered instance %d '%s' kobject\n",
+	debugf4("%s() Registered instance %d '%s' kobject\n",
 		__func__, idx, instance->name);
 
 	return 0;
+
+	/* error unwind stack */
+err_release_instance_kobj:
+	kobject_put(&instance->kobj);
+
+err_out:
+	return err;
 }
 
 /*
  * edac_device_remove_instance
  *	remove an edac_device instance
  */
-static void edac_device_delete_instance(
-		struct edac_device_ctl_info *edac_dev, int idx)
+static void edac_device_delete_instance(struct edac_device_ctl_info *edac_dev,
+					int idx)
 {
-	int i;
 	struct edac_device_instance *instance;
+	int i;
 
 	instance = &edac_dev->instances[idx];
 
 	/* unregister all blocks in this instance */
-	for (i = 0; i < instance->nr_blocks; i++) {
-		edac_device_delete_block(edac_dev,instance,i);
-	}
+	for (i = 0; i < instance->nr_blocks; i++)
+		edac_device_delete_block(edac_dev, &instance->blocks[i]);
 
-	/* unregister this instance's kobject */
-	init_completion(&instance->kobj_complete);
-	kobject_unregister(&instance->kobj);
-	wait_for_completion(&instance->kobj_complete);
+	/* unregister this instance's kobject, SEE:
+	 *	edac_device_ctrl_instance_release() for callback operation
+	 */
+	kobject_put(&instance->kobj);
 }
 
 /*
@@ -735,13 +713,12 @@ static int edac_device_create_instances(struct edac_device_ctl_info *edac_dev)
 	debugf0("%s()\n", __func__);
 
 	/* iterate over creation of the instances */
-	for (i = 0; i < edac_dev->nr_instances; i++ ) {
-		err = edac_device_create_instance(edac_dev,i);
+	for (i = 0; i < edac_dev->nr_instances; i++) {
+		err = edac_device_create_instance(edac_dev, i);
 		if (err) {
 			/* unwind previous instances on error */
-			for (j = 0; j < i; j++) {
-				edac_device_delete_instance(edac_dev,j);
-			}
+			for (j = 0; j < i; j++)
+				edac_device_delete_instance(edac_dev, j);
 			return err;
 		}
 	}
@@ -758,17 +735,73 @@ static void edac_device_delete_instances(struct edac_device_ctl_info *edac_dev)
 	int i;
 
 	/* iterate over creation of the instances */
-	for (i = 0; i < edac_dev->nr_instances; i++ ) {
-		edac_device_delete_instance(edac_dev,i);
+	for (i = 0; i < edac_dev->nr_instances; i++)
+		edac_device_delete_instance(edac_dev, i);
+}
+
+/* edac_dev sysfs ctor/dtor  code */
+
+/*
+ * edac_device_add_main_sysfs_attributes
+ *	add some attributes to this instance's main kobject
+ */
+static int edac_device_add_main_sysfs_attributes(
+			struct edac_device_ctl_info *edac_dev)
+{
+	struct edac_dev_sysfs_attribute *sysfs_attrib;
+	int err = 0;
+
+	sysfs_attrib = edac_dev->sysfs_attributes;
+	if (sysfs_attrib) {
+		/* iterate over the array and create an attribute for each
+		 * entry in the list
+		 */
+		while (sysfs_attrib->attr.name != NULL) {
+			err = sysfs_create_file(&edac_dev->kobj,
+				(struct attribute*) sysfs_attrib);
+			if (err)
+				goto err_out;
+
+			sysfs_attrib++;
+		}
 	}
+
+err_out:
+	return err;
 }
 
-/******************* edac_dev sysfs ctor/dtor  code *************/
+/*
+ * edac_device_remove_main_sysfs_attributes
+ *	remove any attributes to this instance's main kobject
+ */
+static void edac_device_remove_main_sysfs_attributes(
+			struct edac_device_ctl_info *edac_dev)
+{
+	struct edac_dev_sysfs_attribute *sysfs_attrib;
+
+	/* if there are main attributes, defined, remove them. First,
+	 * point to the start of the array and iterate over it
+	 * removing each attribute listed from this device's instance's kobject
+	 */
+	sysfs_attrib = edac_dev->sysfs_attributes;
+	if (sysfs_attrib) {
+		while (sysfs_attrib->attr.name != NULL) {
+			sysfs_remove_file(&edac_dev->kobj,
+					(struct attribute *) sysfs_attrib);
+			sysfs_attrib++;
+		}
+	}
+}
 
 /*
  * edac_device_create_sysfs() Constructor
  *
- * Create a new edac_device kobject instance,
+ * accept a created edac_device control structure
+ * and 'export' it to sysfs. The 'main' kobj should already have been
+ * created. 'instance' and 'block' kobjects should be registered
+ * along with any 'block' attributes from the low driver. In addition,
+ * the main attributes (if any) are connected to the main kobject of
+ * the control structure.
  *
  * Return:
  *	0	Success
@@ -777,61 +810,72 @@ static void edac_device_delete_instances(struct edac_device_ctl_info *edac_dev)
 int edac_device_create_sysfs(struct edac_device_ctl_info *edac_dev)
 {
 	int err;
-	struct kobject *edac_kobj=&edac_dev->kobj;
-
-	/* register this instance's main kobj with the edac class kobj */
-	err = edac_device_register_main_kobj(edac_dev);
-	if (err)
-		return err;
+	struct kobject *edac_kobj = &edac_dev->kobj;
 
 	debugf0("%s() idx=%d\n", __func__, edac_dev->dev_idx);
 
+	/*  go create any main attributes callers wants */
+	err = edac_device_add_main_sysfs_attributes(edac_dev);
+	if (err) {
+		debugf0("%s() failed to add sysfs attribs\n", __func__);
+		goto err_out;
+	}
+
 	/* create a symlink from the edac device
 	 * to the platform 'device' being used for this
 	 */
 	err = sysfs_create_link(edac_kobj,
-				&edac_dev->dev->kobj,
-				EDAC_DEVICE_SYMLINK);
+				&edac_dev->dev->kobj, EDAC_DEVICE_SYMLINK);
 	if (err) {
 		debugf0("%s() sysfs_create_link() returned err= %d\n",
 			__func__, err);
-		return err;
+		goto err_remove_main_attribs;
 	}
 
-	debugf0("%s() calling create-instances, idx=%d\n",
-		__func__, edac_dev->dev_idx);
-
-	/* Create the first level instance directories */
+	/* Create the first level instance directories
+	 * In turn, the nested blocks beneath the instances will
+	 * be registered as well
+	 */
 	err = edac_device_create_instances(edac_dev);
 	if (err) {
-		goto error0;
+		debugf0("%s() edac_device_create_instances() "
+			"returned err= %d\n", __func__, err);
+		goto err_remove_link;
 	}
 
+
+	debugf4("%s() create-instances done, idx=%d\n",
+		__func__, edac_dev->dev_idx);
+
 	return 0;
 
 	/* Error unwind stack */
+err_remove_link:
+	/* remove the sym link */
+	sysfs_remove_link(&edac_dev->kobj, EDAC_DEVICE_SYMLINK);
 
-error0:
-	edac_device_unregister_main_kobj(edac_dev);
+err_remove_main_attribs:
+	edac_device_remove_main_sysfs_attributes(edac_dev);
 
+err_out:
 	return err;
 }
 
 /*
  * edac_device_remove_sysfs() destructor
  *
- * remove a edac_device instance
+ * given an edac_device struct, tear down the kobject resources
  */
 void edac_device_remove_sysfs(struct edac_device_ctl_info *edac_dev)
 {
 	debugf0("%s()\n", __func__);
 
-	edac_device_delete_instances(edac_dev);
+	/* remove any main attributes for this device */
+	edac_device_remove_main_sysfs_attributes(edac_dev);
 
-	/* remove the sym link */
+	/* remove the device sym link */
 	sysfs_remove_link(&edac_dev->kobj, EDAC_DEVICE_SYMLINK);
 
-	/* unregister the instance's main kobj */
-	edac_device_unregister_main_kobj(edac_dev);
+	/* walk the instance/block kobject tree, deconstructing it */
+	edac_device_delete_instances(edac_dev);
 }
-