Merge kroah.com:/home/greg/linux/BK/bleed-2.6

into kroah.com:/home/greg/linux/BK/driver-2.6

Documentation/driver-model/bus.txt

@@ -5,20 +5,21 @@ Definition
 ~~~~~~~~~~
 
 struct bus_type {
-        char                    * name;
-        rwlock_t                lock;
-        atomic_t                refcount;
+	char			* name;
 
-        struct list_head        node;
-        struct list_head        devices;
-        struct list_head        drivers;
+	struct subsystem	subsys;
+	struct kset		drivers;
+	struct kset		devices;
 
-        struct driver_dir_entry dir;
-        struct driver_dir_entry device_dir;
-        struct driver_dir_entry driver_dir;
+	struct bus_attribute	* bus_attrs;
+	struct device_attribute	* dev_attrs;
+	struct driver_attribute	* drv_attrs;
 
-        int     (*match)        (struct device * dev, struct device_driver * drv);
-	struct device (*add)	(struct device * parent, char * bus_id);
+	int		(*match)(struct device * dev, struct device_driver * drv);
+	int		(*hotplug) (struct device *dev, char **envp, 
+				    int num_envp, char *buffer, int buffer_size);
+	int		(*suspend)(struct device * dev, u32 state);
+	int		(*resume)(struct device * dev);
 };
 
 int bus_register(struct bus_type * bus);
@@ -47,7 +48,7 @@ Registration
 When a bus driver is initialized, it calls bus_register. This
 initializes the rest of the fields in the bus object and inserts it
 into a global list of bus types. Once the bus object is registered, 
-the fields in it (e.g. the rwlock_t) are usable by the bus driver. 
+the fields in it are usable by the bus driver. 
 
 
 Callbacks
@@ -71,40 +72,6 @@ When a driver is registered with the bus, the bus's list of devices is
 iterated over, and the match callback is called for each device that
 does not have a driver associated with it. 
 
-add(): Adding a child device
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-
-The add callback is available to notify the bus about a child device
-at a particular location. 
-
-The parent parameter is the parent device of the child to be added. If
-parent == NULL, the bus should add the device as a child of a default
-parent device or as a child of the root. This policy decision is up to
-the bus driver.
-
-The format of the bus_id field should be consistent with the format of
-the bus_id field of the rest of the devices on the bus. This requires
-the caller to know the format.
-
-On return, the bus driver should return a pointer to the device that
-was created. If the device was not created, the bus driver should
-return an appropriate error code. Refer to include/linux/err.h for
-helper functions to encode errors. Some sample code:
-
-struct device * pci_bus_add(struct device * parent, char * bus_id)
-{
-	...
-	/* the device already exists */
-	return ERR_PTR(-EEXIST);
-	...
-}
-
-The caller can check the return value using IS_ERR():
-
-    struct device * newdev = pci_bus_type.add(parent,bus_id);
-    if (IS_ERR(newdev)) {
-	...
-    }
 
 
 Device and Driver Lists
@@ -118,10 +85,11 @@ necessary.
 
 The LDM core provides helper functions for iterating over each list.
 
-int bus_for_each_dev(struct bus_type * bus, void * data, 
-		     int (*callback)(struct device * dev, void * data));
-int bus_for_each_drv(struct bus_type * bus, void * data,
-		     int (*callback)(struct device_driver * drv, void * data));
+int bus_for_each_dev(struct bus_type * bus, struct device * start, void * data,
+		     int (*fn)(struct device *, void *));
+
+int bus_for_each_drv(struct bus_type * bus, struct device_driver * start, 
+		     void * data, int (*fn)(struct device_driver *, void *));
 
 These helpers iterate over the respective list, and call the callback
 for each device or driver in the list. All list accesses are
@@ -168,9 +136,9 @@ hierarchy:
 Exporting Attributes
 ~~~~~~~~~~~~~~~~~~~~
 struct bus_attribute {
-        struct attribute        attr;
-        ssize_t (*show)(struct bus_type *, char * buf, size_t count, loff_t off);
-        ssize_t (*store)(struct bus_type *, const char * buf, size_t count, loff_t off);
+	struct attribute	attr;
+	ssize_t (*show)(struct bus_type *, char * buf);
+	ssize_t (*store)(struct bus_type *, const char * buf, size_t count);
 };
 
 Bus drivers can export attributes using the BUS_ATTR macro that works

drivers/base/class.c

@@ -349,14 +349,19 @@ void class_device_initialize(struct class_device *class_dev)
 
 int class_device_add(struct class_device *class_dev)
 {
-	struct class * parent;
+	struct class * parent = NULL;
 	struct class_interface * class_intf;
 	int error;
 
 	class_dev = class_device_get(class_dev);
-	if (!class_dev || !strlen(class_dev->class_id))
+	if (!class_dev)
 		return -EINVAL;
 
+	if (!strlen(class_dev->class_id)) {
+		error = -EINVAL;
+		goto register_done;
+	}
+
 	parent = class_get(class_dev->class);
 
 	pr_debug("CLASS: registering class device: ID = '%s'\n",

drivers/char/tty_io.c

@@ -763,6 +763,17 @@ ssize_t redirected_tty_write(struct file * file, const char __user * buf, size_t
 	return tty_write(file, buf, count, ppos);
 }
 
+static char ptychar[] = "pqrstuvwxyzabcde";
+
+static inline void pty_line_name(struct tty_driver *driver, int index, char *p)
+{
+	int i = index + driver->name_base;
+	/* ->name is initialized to "ttyp", but "tty" is expected */
+	sprintf(p, "%s%c%x",
+			driver->subtype == PTY_TYPE_SLAVE ? "tty" : driver->name,
+			ptychar[i >> 4 & 0xf], i & 0xf);
+}
+
 static inline void tty_line_name(struct tty_driver *driver, int index, char *p)
 {
 	sprintf(p, "%s%d", driver->name, index + driver->name_base);
@@ -2175,6 +2186,7 @@ static struct class_simple *tty_class;
 void tty_register_device(struct tty_driver *driver, unsigned index,
 			 struct device *device)
 {
+	char name[64];
 	dev_t dev = MKDEV(driver->major, driver->minor_start) + index;
 
 	if (index >= driver->num) {
@@ -2186,13 +2198,11 @@ void tty_register_device(struct tty_driver *driver, unsigned index,
 	devfs_mk_cdev(dev, S_IFCHR | S_IRUSR | S_IWUSR,
 			"%s%d", driver->devfs_name, index + driver->name_base);
 
-	/* we don't care about the ptys */
-	/* how nice to hide this behind some crappy interface.. */
-	if (driver->type != TTY_DRIVER_TYPE_PTY) {
-		char name[64];
+	if (driver->type == TTY_DRIVER_TYPE_PTY)
+		pty_line_name(driver, index, name);
+	else
 		tty_line_name(driver, index, name);
-		class_simple_device_add(tty_class, dev, device, name);
-	}
+	class_simple_device_add(tty_class, dev, device, name);
 }
 
 /**

drivers/scsi/sd.c

@@ -182,16 +182,14 @@ static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
 	if (disk->private_data == NULL)
 		goto out;
 	sdkp = scsi_disk(disk);
-	if (!kref_get(&sdkp->kref))
-		goto out_sdkp;
+	kref_get(&sdkp->kref);
 	if (scsi_device_get(sdkp->device))
 		goto out_put;
 	up(&sd_ref_sem);
 	return sdkp;
 
  out_put:
-	kref_put(&sdkp->kref);
- out_sdkp:
+	kref_put(&sdkp->kref, scsi_disk_release);
 	sdkp = NULL;
  out:
 	up(&sd_ref_sem);
@@ -202,7 +200,7 @@ static void scsi_disk_put(struct scsi_disk *sdkp)
 {
 	down(&sd_ref_sem);
 	scsi_device_put(sdkp->device);
-	kref_put(&sdkp->kref);
+	kref_put(&sdkp->kref, scsi_disk_release);
 	up(&sd_ref_sem);
 }
 
@@ -1420,7 +1418,7 @@ static int sd_probe(struct device *dev)
 		goto out;
 
 	memset (sdkp, 0, sizeof(*sdkp));
-	kref_init(&sdkp->kref, scsi_disk_release);
+	kref_init(&sdkp->kref);
 
 	/* Note: We can accomodate 64 partitions, but the genhd code
 	 * assumes partitions allocate consecutive minors, which they don't.
@@ -1522,7 +1520,7 @@ static int sd_remove(struct device *dev)
 	del_gendisk(sdkp->disk);
 	sd_shutdown(dev);
 	down(&sd_ref_sem);
-	kref_put(&sdkp->kref);
+	kref_put(&sdkp->kref, scsi_disk_release);
 	up(&sd_ref_sem);
 
 	return 0;

drivers/scsi/sr.c

@@ -140,15 +140,13 @@ static inline struct scsi_cd *scsi_cd_get(struct gendisk *disk)
 	if (disk->private_data == NULL)
 		goto out;
 	cd = scsi_cd(disk);
-	if (!kref_get(&cd->kref))
-		goto out_null;
+	kref_get(&cd->kref);
 	if (scsi_device_get(cd->device))
 		goto out_put;
 	goto out;
 
  out_put:
-	kref_put(&cd->kref);
- out_null:
+	kref_put(&cd->kref, sr_kref_release);
 	cd = NULL;
  out:
 	up(&sr_ref_sem);
@@ -159,7 +157,7 @@ static inline void scsi_cd_put(struct scsi_cd *cd)
 {
 	down(&sr_ref_sem);
 	scsi_device_put(cd->device);
-	kref_put(&cd->kref);
+	kref_put(&cd->kref, sr_kref_release);
 	up(&sr_ref_sem);
 }
 
@@ -576,7 +574,7 @@ static int sr_probe(struct device *dev)
 		goto fail;
 	memset(cd, 0, sizeof(*cd));
 
-	kref_init(&cd->kref, sr_kref_release);
+	kref_init(&cd->kref);
 
 	disk = alloc_disk(1);
 	if (!disk)
@@ -937,7 +935,7 @@ static int sr_remove(struct device *dev)
 	del_gendisk(cd->disk);
 
 	down(&sr_ref_sem);
-	kref_put(&cd->kref);
+	kref_put(&cd->kref, sr_kref_release);
 	up(&sr_ref_sem);
 
 	return 0;

drivers/usb/core/config.c

@@ -106,7 +106,7 @@ static int usb_parse_endpoint(struct device *ddev, int cfgno, int inum,
 	return buffer - buffer0 + i;
 }
 
-static void usb_release_interface_cache(struct kref *ref)
+void usb_release_interface_cache(struct kref *ref)
 {
 	struct usb_interface_cache *intfc = ref_to_usb_interface_cache(ref);
 	int j;
@@ -356,7 +356,7 @@ int usb_parse_configuration(struct device *ddev, int cfgidx,
 		if (!intfc)
 			return -ENOMEM;
 		memset(intfc, 0, len);
-		kref_init(&intfc->ref, usb_release_interface_cache);
+		kref_init(&intfc->ref);
 	}
 
 	/* Skip over any Class Specific or Vendor Specific descriptors;
@@ -422,7 +422,8 @@ void usb_destroy_configuration(struct usb_device *dev)
 
 		for (i = 0; i < cf->desc.bNumInterfaces; i++) {
 			if (cf->intf_cache[i])
-				kref_put(&cf->intf_cache[i]->ref);
+				kref_put(&cf->intf_cache[i]->ref, 
+					  usb_release_interface_cache);
 		}
 	}
 	kfree(dev->config);

drivers/usb/core/message.c

@@ -1196,7 +1196,7 @@ static void release_interface(struct device *dev)
 	struct usb_interface_cache *intfc =
 			altsetting_to_usb_interface_cache(intf->altsetting);
 
-	kref_put(&intfc->ref);
+	kref_put(&intfc->ref, usb_release_interface_cache);
 	kfree(intf);
 }
 

drivers/usb/core/urb.c

@@ -39,7 +39,7 @@ void usb_init_urb(struct urb *urb)
 {
 	if (urb) {
 		memset(urb, 0, sizeof(*urb));
-		kref_init(&urb->kref, urb_destroy);
+		kref_init(&urb->kref);
 		spin_lock_init(&urb->lock);
 	}
 }
@@ -88,7 +88,7 @@ struct urb *usb_alloc_urb(int iso_packets, int mem_flags)
 void usb_free_urb(struct urb *urb)
 {
 	if (urb)
-		kref_put(&urb->kref);
+		kref_put(&urb->kref, urb_destroy);
 }
 
 /**

drivers/usb/core/usb.h

@@ -10,6 +10,7 @@ extern int usb_unbind_interface (struct device *dev);
 extern void usb_disable_endpoint (struct usb_device *dev, unsigned int epaddr);
 extern void usb_disable_interface (struct usb_device *dev,
 		struct usb_interface *intf);
+extern void usb_release_interface_cache(struct kref *ref);
 extern void usb_disable_device (struct usb_device *dev, int skip_ep0);
 
 extern void usb_enable_endpoint (struct usb_device *dev,

drivers/usb/host/ehci-mem.c

@@ -114,7 +114,7 @@ static struct ehci_qh *ehci_qh_alloc (struct ehci_hcd *ehci, int flags)
 		return qh;
 
 	memset (qh, 0, sizeof *qh);
-	kref_init(&qh->kref, qh_destroy);
+	kref_init(&qh->kref);
 	qh->ehci = ehci;
 	qh->qh_dma = dma;
 	// INIT_LIST_HEAD (&qh->qh_list);
@@ -139,7 +139,7 @@ static inline struct ehci_qh *qh_get (struct ehci_qh *qh)
 
 static inline void qh_put (struct ehci_qh *qh)
 {
-	kref_put(&qh->kref);
+	kref_put(&qh->kref, qh_destroy);
 }
 
 /*-------------------------------------------------------------------------*/

drivers/usb/serial/usb-serial.c

@@ -421,6 +421,63 @@ static void return_serial (struct usb_serial *serial)
 	return;
 }
 
+static void destroy_serial(struct kref *kref)
+{
+	struct usb_serial *serial;
+	struct usb_serial_port *port;
+	int i;
+
+	serial = to_usb_serial(kref);
+
+	dbg ("%s - %s", __FUNCTION__, serial->type->name);
+
+	serial->type->shutdown(serial);
+
+	/* return the minor range that this device had */
+	return_serial(serial);
+
+	for (i = 0; i < serial->num_ports; ++i)
+		serial->port[i]->open_count = 0;
+
+	/* the ports are cleaned up and released in port_release() */
+	for (i = 0; i < serial->num_ports; ++i)
+		if (serial->port[i]->dev.parent != NULL) {
+			device_unregister(&serial->port[i]->dev);
+			serial->port[i] = NULL;
+		}
+
+	/* If this is a "fake" port, we have to clean it up here, as it will
+	 * not get cleaned up in port_release() as it was never registered with
+	 * the driver core */
+	if (serial->num_ports < serial->num_port_pointers) {
+		for (i = serial->num_ports; i < serial->num_port_pointers; ++i) {
+			port = serial->port[i];
+			if (!port)
+				continue;
+			if (port->read_urb) {
+				usb_unlink_urb(port->read_urb);
+				usb_free_urb(port->read_urb);
+			}
+			if (port->write_urb) {
+				usb_unlink_urb(port->write_urb);
+				usb_free_urb(port->write_urb);
+			}
+			if (port->interrupt_in_urb) {
+				usb_unlink_urb(port->interrupt_in_urb);
+				usb_free_urb(port->interrupt_in_urb);
+			}
+			kfree(port->bulk_in_buffer);
+			kfree(port->bulk_out_buffer);
+			kfree(port->interrupt_in_buffer);
+		}
+	}
+
+	usb_put_dev(serial->dev);
+
+	/* free up any memory that we allocated */
+	kfree (serial);
+}
+
 /*****************************************************************************
  * Driver tty interface functions
  *****************************************************************************/
@@ -465,7 +522,7 @@ static int serial_open (struct tty_struct *tty, struct file * filp)
 		if (retval) {
 			port->open_count = 0;
 			module_put(serial->type->owner);
-			kref_put(&serial->kref);
+			kref_put(&serial->kref, destroy_serial);
 		}
 	}
 bailout:
@@ -496,7 +553,7 @@ static void serial_close(struct tty_struct *tty, struct file * filp)
 	}
 
 	module_put(port->serial->type->owner);
-	kref_put(&port->serial->kref);
+	kref_put(&port->serial->kref, destroy_serial);
 }
 
 static int serial_write (struct tty_struct * tty, int from_user, const unsigned char *buf, int count)
@@ -654,13 +711,6 @@ static void serial_break (struct tty_struct *tty, int break_state)
 	;
 }
 
-static void serial_shutdown (struct usb_serial *serial)
-{
-	dbg ("%s", __FUNCTION__);
-
-	serial->type->shutdown(serial);
-}
-
 static int serial_read_proc (char *page, char **start, off_t off, int count, int *eof, void *data)
 {
 	struct usb_serial *serial;
@@ -694,7 +744,7 @@ static int serial_read_proc (char *page, char **start, off_t off, int count, int
 			begin += length;
 			length = 0;
 		}
-		kref_put(&serial->kref);
+		kref_put(&serial->kref, destroy_serial);
 	}
 	*eof = 1;
 done:
@@ -763,62 +813,6 @@ void usb_serial_port_softint(void *private)
 	wake_up_interruptible(&tty->write_wait);
 }
 
-static void destroy_serial(struct kref *kref)
-{
-	struct usb_serial *serial;
-	struct usb_serial_port *port;
-	int i;
-
-	serial = to_usb_serial(kref);
-
-	dbg ("%s - %s", __FUNCTION__, serial->type->name);
-	serial_shutdown (serial);
-
-	/* return the minor range that this device had */
-	return_serial(serial);
-
-	for (i = 0; i < serial->num_ports; ++i)
-		serial->port[i]->open_count = 0;
-
-	/* the ports are cleaned up and released in port_release() */
-	for (i = 0; i < serial->num_ports; ++i)
-		if (serial->port[i]->dev.parent != NULL) {
-			device_unregister(&serial->port[i]->dev);
-			serial->port[i] = NULL;
-		}
-
-	/* If this is a "fake" port, we have to clean it up here, as it will
-	 * not get cleaned up in port_release() as it was never registered with
-	 * the driver core */
-	if (serial->num_ports < serial->num_port_pointers) {
-		for (i = serial->num_ports; i < serial->num_port_pointers; ++i) {
-			port = serial->port[i];
-			if (!port)
-				continue;
-			if (port->read_urb) {
-				usb_unlink_urb(port->read_urb);
-				usb_free_urb(port->read_urb);
-			}
-			if (port->write_urb) {
-				usb_unlink_urb(port->write_urb);
-				usb_free_urb(port->write_urb);
-			}
-			if (port->interrupt_in_urb) {
-				usb_unlink_urb(port->interrupt_in_urb);
-				usb_free_urb(port->interrupt_in_urb);
-			}
-			kfree(port->bulk_in_buffer);
-			kfree(port->bulk_out_buffer);
-			kfree(port->interrupt_in_buffer);
-		}
-	}
-
-	usb_put_dev(serial->dev);
-
-	/* free up any memory that we allocated */
-	kfree (serial);
-}
-
 static void port_release(struct device *dev)
 {
 	struct usb_serial_port *port = to_usb_serial_port(dev);
@@ -859,7 +853,7 @@ static struct usb_serial * create_serial (struct usb_device *dev,
 	serial->interface = interface;
 	serial->vendor = dev->descriptor.idVendor;
 	serial->product = dev->descriptor.idProduct;
-	kref_init(&serial->kref, destroy_serial);
+	kref_init(&serial->kref);
 
 	return serial;
 }
@@ -1209,7 +1203,7 @@ void usb_serial_disconnect(struct usb_interface *interface)
 	if (serial) {
 		/* let the last holder of this object 
 		 * cause it to be cleaned up */
-		kref_put(&serial->kref);
+		kref_put(&serial->kref, destroy_serial);
 	}
 	dev_info(dev, "device disconnected\n");
 }

include/linux/device.h

@@ -59,7 +59,6 @@ struct bus_type {
 	struct driver_attribute	* drv_attrs;
 
 	int		(*match)(struct device * dev, struct device_driver * drv);
-	struct device * (*add)	(struct device * parent, char * bus_id);
 	int		(*hotplug) (struct device *dev, char **envp, 
 				    int num_envp, char *buffer, int buffer_size);
 	int		(*suspend)(struct device * dev, u32 state);

include/linux/kobject.h

@@ -19,6 +19,7 @@
 #include <linux/list.h>
 #include <linux/sysfs.h>
 #include <linux/rwsem.h>
+#include <linux/kref.h>
 #include <asm/atomic.h>
 
 #define KOBJ_NAME_LEN	20
@@ -26,7 +27,7 @@
 struct kobject {
 	char			* k_name;
 	char			name[KOBJ_NAME_LEN];
-	atomic_t		refcount;
+	struct kref		kref;
 	struct list_head	entry;
 	struct kobject		* parent;
 	struct kset		* kset;
@@ -58,6 +59,8 @@ extern void kobject_put(struct kobject *);
 
 extern void kobject_hotplug(const char *action, struct kobject *);
 
+extern char * kobject_get_path(struct kset *, struct kobject *, int);
+
 struct kobj_type {
 	void (*release)(struct kobject *);
 	struct sysfs_ops	* sysfs_ops;

include/linux/kref.h

@@ -18,15 +18,12 @@
 #include <linux/types.h>
 #include <asm/atomic.h>
 
-
 struct kref {
 	atomic_t refcount;
-	void (*release)(struct kref *kref);
 };
 
-void kref_init(struct kref *kref, void (*release)(struct kref *));
-struct kref *kref_get(struct kref *kref);
-void kref_put(struct kref *kref);
-
+void kref_init(struct kref *kref);
+void kref_get(struct kref *kref);
+void kref_put(struct kref *kref, void (*release) (struct kref *kref));
 
 #endif /* _KREF_H_ */

lib/Makefile

@@ -5,12 +5,9 @@
 
 lib-y := errno.o ctype.o string.o vsprintf.o cmdline.o \
 	 bust_spinlocks.o rbtree.o radix-tree.o dump_stack.o \
-	 kobject.o idr.o div64.o parser.o int_sqrt.o \
+	 kobject.o kref.o idr.o div64.o parser.o int_sqrt.o \
 	 bitmap.o extable.o
 
-# hack for now till some static code uses krefs, then it can move up above...
-obj-y += kref.o
-
 lib-$(CONFIG_RWSEM_GENERIC_SPINLOCK) += rwsem-spinlock.o
 lib-$(CONFIG_RWSEM_XCHGADD_ALGORITHM) += rwsem.o
 

lib/kobject.c

@@ -58,14 +58,11 @@ static int create_dir(struct kobject * kobj)
 	return error;
 }
 
-
 static inline struct kobject * to_kobj(struct list_head * entry)
 {
 	return container_of(entry,struct kobject,entry);
 }
 
-
-#ifdef CONFIG_HOTPLUG
 static int get_kobj_path_length(struct kset *kset, struct kobject *kobj)
 {
 	int length = 1;
@@ -98,6 +95,31 @@ static void fill_kobj_path(struct kset *kset, struct kobject *kobj, char *path,
 	pr_debug("%s: path = '%s'\n",__FUNCTION__,path);
 }
 
+/**
+ * kobject_get_path - generate and return the path associated with a given kobj
+ * and kset pair.  The result must be freed by the caller with kfree().
+ *
+ * @kset:	kset in question, with which to build the path
+ * @kobj:	kobject in question, with which to build the path
+ * @gfp_mask:	the allocation type used to allocate the path
+ */
+char * kobject_get_path(struct kset *kset, struct kobject *kobj, int gfp_mask)
+{
+	char *path;
+	int len;
+
+	len = get_kobj_path_length(kset, kobj);
+	path = kmalloc(len, gfp_mask);
+	if (!path)
+		return NULL;
+	memset(path, 0x00, len);
+	fill_kobj_path(kset, kobj, path, len);
+
+	return path;
+}
+
+#ifdef CONFIG_HOTPLUG
+
 #define BUFFER_SIZE	1024	/* should be enough memory for the env */
 #define NUM_ENVP	32	/* number of env pointers */
 static unsigned long sequence_num;
@@ -112,7 +134,6 @@ static void kset_hotplug(const char *action, struct kset *kset,
 	char *scratch;
 	int i = 0;
 	int retval;
-	int kobj_path_length;
 	char *kobj_path = NULL;
 	char *name = NULL;
 	unsigned long seq;
@@ -163,12 +184,9 @@ static void kset_hotplug(const char *action, struct kset *kset,
 	envp [i++] = scratch;
 	scratch += sprintf(scratch, "SEQNUM=%ld", seq) + 1;
 
-	kobj_path_length = get_kobj_path_length (kset, kobj);
-	kobj_path = kmalloc (kobj_path_length, GFP_KERNEL);
+	kobj_path = kobject_get_path(kset, kobj, GFP_KERNEL);
 	if (!kobj_path)
 		goto exit;
-	memset (kobj_path, 0x00, kobj_path_length);
-	fill_kobj_path (kset, kobj, kobj_path, kobj_path_length);
 
 	envp [i++] = scratch;
 	scratch += sprintf (scratch, "DEVPATH=%s", kobj_path) + 1;
@@ -225,10 +243,9 @@ void kobject_hotplug(const char *action, struct kobject *kobj)
  *	kobject_init - initialize object.
  *	@kobj:	object in question.
  */
-
 void kobject_init(struct kobject * kobj)
 {
-	atomic_set(&kobj->refcount,1);
+ 	kref_init(&kobj->kref);
 	INIT_LIST_HEAD(&kobj->entry);
 	kobj->kset = kset_get(kobj->kset);
 }
@@ -325,7 +342,7 @@ int kobject_register(struct kobject * kobj)
  *	@kobj:	object.
  *	@name:	name. 
  *
- *	If strlen(name) < KOBJ_NAME_LEN, then use a dynamically allocated
+ *	If strlen(name) >= KOBJ_NAME_LEN, then use a dynamically allocated
  *	string that @kobj->k_name points to. Otherwise, use the static 
  *	@kobj->name array.
  */
@@ -429,10 +446,8 @@ void kobject_unregister(struct kobject * kobj)
 
 struct kobject * kobject_get(struct kobject * kobj)
 {
-	if (kobj) {
-		WARN_ON(!atomic_read(&kobj->refcount));
-		atomic_inc(&kobj->refcount);
-	}
+	if (kobj)
+		kref_get(&kobj->kref);
 	return kobj;
 }
 
@@ -459,17 +474,21 @@ void kobject_cleanup(struct kobject * kobj)
 		kobject_put(parent);
 }
 
+static void kobject_release(struct kref *kref)
+{
+	kobject_cleanup(container_of(kref, struct kobject, kref));
+}
+
 /**
  *	kobject_put - decrement refcount for object.
  *	@kobj:	object.
  *
  *	Decrement the refcount, and if 0, call kobject_cleanup().
  */
-
 void kobject_put(struct kobject * kobj)
 {
-	if (atomic_dec_and_test(&kobj->refcount))
-		kobject_cleanup(kobj);
+	if (kobj)
+		kref_put(&kobj->kref, kobject_release);
 }
 
 
@@ -626,7 +645,7 @@ void subsys_remove_file(struct subsystem * s, struct subsys_attribute * a)
 	}
 }
 
-
+EXPORT_SYMBOL(kobject_get_path);
 EXPORT_SYMBOL(kobject_init);
 EXPORT_SYMBOL(kobject_register);
 EXPORT_SYMBOL(kobject_unregister);

lib/kref.c

@@ -11,48 +11,45 @@
  *
  */
 
-/* #define DEBUG */
-
 #include <linux/kref.h>
 #include <linux/module.h>
 
 /**
  * kref_init - initialize object.
  * @kref: object in question.
- * @release: pointer to a function that will clean up the object
- *	     when the last reference to the object is released.
- *	     This pointer is required.
  */
-void kref_init(struct kref *kref, void (*release)(struct kref *kref))
+void kref_init(struct kref *kref)
 {
-	WARN_ON(release == NULL);
 	atomic_set(&kref->refcount,1);
-	kref->release = release;
 }
 
 /**
  * kref_get - increment refcount for object.
  * @kref: object.
  */
-struct kref *kref_get(struct kref *kref)
+void kref_get(struct kref *kref)
 {
 	WARN_ON(!atomic_read(&kref->refcount));
 	atomic_inc(&kref->refcount);
-	return kref;
 }
 
 /**
  * kref_put - decrement refcount for object.
  * @kref: object.
+ * @release: pointer to the function that will clean up the object when the
+ *	     last reference to the object is released.
+ *	     This pointer is required, and it is not acceptable to pass kfree
+ *	     in as this function.
  *
- * Decrement the refcount, and if 0, call kref->release().
+ * Decrement the refcount, and if 0, call release().
  */
-void kref_put(struct kref *kref)
+void kref_put(struct kref *kref, void (*release) (struct kref *kref))
 {
-	if (atomic_dec_and_test(&kref->refcount)) {
-		pr_debug("kref cleaning up\n");
-		kref->release(kref);
-	}
+	WARN_ON(release == NULL);
+	WARN_ON(release == (void (*)(struct kref *))kfree);
+
+	if (atomic_dec_and_test(&kref->refcount))
+		release(kref);
 }
 
 EXPORT_SYMBOL(kref_init);