Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core-2.6

* git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core-2.6:
  Driver Core: devtmpfs - kernel-maintained tmpfs-based /dev
  debugfs: Modify default debugfs directory for debugging pktcdvd.
  debugfs: Modified default dir of debugfs for debugging UHCI.
  debugfs: Change debugfs directory of IWMC3200
  debugfs: Change debuhgfs directory of trace-events-sample.h
  debugfs: Fix mount directory of debugfs by default in events.txt
  hpilo: add poll f_op
  hpilo: add interrupt handler
  hpilo: staging for interrupt handling
  driver core: platform_device_add_data(): use kmemdup()
  Driver core: Add support for compatibility classes
  uio: add generic driver for PCI 2.3 devices
  driver-core: move dma-coherent.c from kernel to driver/base
  mem_class: fix bug
  mem_class: use minor as index instead of searching the array
  driver model: constify attribute groups
  UIO: remove 'default n' from Kconfig
  Driver core: Add accessor for device platform data
  Driver core: move dev_get/set_drvdata to drivers/base/dd.c
  Driver core: add new device to bus's list before probing

12 files changed, 735 insertions, 31 deletions

diff --git a/drivers/base/Kconfig b/drivers/base/Kconfig
index 8f006f9..ee37727 100644
--- a/drivers/base/Kconfig
+++ b/drivers/base/Kconfig
@@ -8,6 +8,31 @@ config UEVENT_HELPER_PATH
 	  Path to uevent helper program forked by the kernel for
 	  every uevent.
 
+config DEVTMPFS
+	bool "Create a kernel maintained /dev tmpfs (EXPERIMENTAL)"
+	depends on HOTPLUG && SHMEM && TMPFS
+	help
+	  This creates a tmpfs filesystem, and mounts it at bootup
+	  and mounts it at /dev. The kernel driver core creates device
+	  nodes for all registered devices in that filesystem. All device
+	  nodes are owned by root and have the default mode of 0600.
+	  Userspace can add and delete the nodes as needed. This is
+	  intended to simplify bootup, and make it possible to delay
+	  the initial coldplug at bootup done by udev in userspace.
+	  It should also provide a simpler way for rescue systems
+	  to bring up a kernel with dynamic major/minor numbers.
+	  Meaningful symlinks, permissions and device ownership must
+	  still be handled by userspace.
+	  If unsure, say N here.
+
+config DEVTMPFS_MOUNT
+	bool "Automount devtmpfs at /dev"
+	depends on DEVTMPFS
+	help
+	  This will mount devtmpfs at /dev if the kernel mounts the root
+	  filesystem. It will not affect initramfs based mounting.
+	  If unsure, say N here.
+
 config STANDALONE
 	bool "Select only drivers that don't need compile-time external firmware" if EXPERIMENTAL
 	default y
diff --git a/drivers/base/Makefile b/drivers/base/Makefile
index b5b8ba5..c12c7f2 100644
--- a/drivers/base/Makefile
+++ b/drivers/base/Makefile
@@ -4,8 +4,10 @@ obj-y			:= core.o sys.o bus.o dd.o \
 			   driver.o class.o platform.o \
 			   cpu.o firmware.o init.o map.o devres.o \
 			   attribute_container.o transport_class.o
+obj-$(CONFIG_DEVTMPFS)	+= devtmpfs.o
 obj-y			+= power/
 obj-$(CONFIG_HAS_DMA)	+= dma-mapping.o
+obj-$(CONFIG_HAVE_GENERIC_DMA_COHERENT) += dma-coherent.o
 obj-$(CONFIG_ISA)	+= isa.o
 obj-$(CONFIG_FW_LOADER)	+= firmware_class.o
 obj-$(CONFIG_NUMA)	+= node.o
diff --git a/drivers/base/base.h b/drivers/base/base.h
index b528145..2ca7f5b 100644
--- a/drivers/base/base.h
+++ b/drivers/base/base.h
@@ -70,6 +70,8 @@ struct class_private {
  * @knode_parent - node in sibling list
  * @knode_driver - node in driver list
  * @knode_bus - node in bus list
+ * @driver_data - private pointer for driver specific info.  Will turn into a
+ * list soon.
  * @device - pointer back to the struct class that this structure is
  * associated with.
  *
@@ -80,6 +82,7 @@ struct device_private {
 	struct klist_node knode_parent;
 	struct klist_node knode_driver;
 	struct klist_node knode_bus;
+	void *driver_data;
 	struct device *device;
 };
 #define to_device_private_parent(obj)	\
@@ -89,6 +92,8 @@ struct device_private {
 #define to_device_private_bus(obj)	\
 	container_of(obj, struct device_private, knode_bus)
 
+extern int device_private_init(struct device *dev);
+
 /* initialisation functions */
 extern int devices_init(void);
 extern int buses_init(void);
@@ -104,7 +109,7 @@ extern int system_bus_init(void);
 extern int cpu_dev_init(void);
 
 extern int bus_add_device(struct device *dev);
-extern void bus_attach_device(struct device *dev);
+extern void bus_probe_device(struct device *dev);
 extern void bus_remove_device(struct device *dev);
 
 extern int bus_add_driver(struct device_driver *drv);
@@ -134,3 +139,9 @@ static inline void module_add_driver(struct module *mod,
 				     struct device_driver *drv) { }
 static inline void module_remove_driver(struct device_driver *drv) { }
 #endif
+
+#ifdef CONFIG_DEVTMPFS
+extern int devtmpfs_init(void);
+#else
+static inline int devtmpfs_init(void) { return 0; }
+#endif
diff --git a/drivers/base/bus.c b/drivers/base/bus.c
index 4b04a15..973bf2a 100644
--- a/drivers/base/bus.c
+++ b/drivers/base/bus.c
@@ -459,8 +459,9 @@ static inline void remove_deprecated_bus_links(struct device *dev) { }
  * bus_add_device - add device to bus
  * @dev: device being added
  *
+ * - Add device's bus attributes.
+ * - Create links to device's bus.
  * - Add the device to its bus's list of devices.
- * - Create link to device's bus.
  */
 int bus_add_device(struct device *dev)
 {
@@ -483,6 +484,7 @@ int bus_add_device(struct device *dev)
 		error = make_deprecated_bus_links(dev);
 		if (error)
 			goto out_deprecated;
+		klist_add_tail(&dev->p->knode_bus, &bus->p->klist_devices);
 	}
 	return 0;
 
@@ -498,24 +500,19 @@ out_put:
 }
 
 /**
- * bus_attach_device - add device to bus
- * @dev: device tried to attach to a driver
+ * bus_probe_device - probe drivers for a new device
+ * @dev: device to probe
  *
- * - Add device to bus's list of devices.
- * - Try to attach to driver.
+ * - Automatically probe for a driver if the bus allows it.
  */
-void bus_attach_device(struct device *dev)
+void bus_probe_device(struct device *dev)
 {
 	struct bus_type *bus = dev->bus;
-	int ret = 0;
+	int ret;
 
-	if (bus) {
-		if (bus->p->drivers_autoprobe)
-			ret = device_attach(dev);
+	if (bus && bus->p->drivers_autoprobe) {
+		ret = device_attach(dev);
 		WARN_ON(ret < 0);
-		if (ret >= 0)
-			klist_add_tail(&dev->p->knode_bus,
-				       &bus->p->klist_devices);
 	}
 }
 
diff --git a/drivers/base/class.c b/drivers/base/class.c
index eb85e43..161746d 100644
--- a/drivers/base/class.c
+++ b/drivers/base/class.c
@@ -488,6 +488,93 @@ void class_interface_unregister(struct class_interface *class_intf)
 	class_put(parent);
 }
 
+struct class_compat {
+	struct kobject *kobj;
+};
+
+/**
+ * class_compat_register - register a compatibility class
+ * @name: the name of the class
+ *
+ * Compatibility class are meant as a temporary user-space compatibility
+ * workaround when converting a family of class devices to a bus devices.
+ */
+struct class_compat *class_compat_register(const char *name)
+{
+	struct class_compat *cls;
+
+	cls = kmalloc(sizeof(struct class_compat), GFP_KERNEL);
+	if (!cls)
+		return NULL;
+	cls->kobj = kobject_create_and_add(name, &class_kset->kobj);
+	if (!cls->kobj) {
+		kfree(cls);
+		return NULL;
+	}
+	return cls;
+}
+EXPORT_SYMBOL_GPL(class_compat_register);
+
+/**
+ * class_compat_unregister - unregister a compatibility class
+ * @cls: the class to unregister
+ */
+void class_compat_unregister(struct class_compat *cls)
+{
+	kobject_put(cls->kobj);
+	kfree(cls);
+}
+EXPORT_SYMBOL_GPL(class_compat_unregister);
+
+/**
+ * class_compat_create_link - create a compatibility class device link to
+ *			      a bus device
+ * @cls: the compatibility class
+ * @dev: the target bus device
+ * @device_link: an optional device to which a "device" link should be created
+ */
+int class_compat_create_link(struct class_compat *cls, struct device *dev,
+			     struct device *device_link)
+{
+	int error;
+
+	error = sysfs_create_link(cls->kobj, &dev->kobj, dev_name(dev));
+	if (error)
+		return error;
+
+	/*
+	 * Optionally add a "device" link (typically to the parent), as a
+	 * class device would have one and we want to provide as much
+	 * backwards compatibility as possible.
+	 */
+	if (device_link) {
+		error = sysfs_create_link(&dev->kobj, &device_link->kobj,
+					  "device");
+		if (error)
+			sysfs_remove_link(cls->kobj, dev_name(dev));
+	}
+
+	return error;
+}
+EXPORT_SYMBOL_GPL(class_compat_create_link);
+
+/**
+ * class_compat_remove_link - remove a compatibility class device link to
+ *			      a bus device
+ * @cls: the compatibility class
+ * @dev: the target bus device
+ * @device_link: an optional device to which a "device" link was previously
+ * 		 created
+ */
+void class_compat_remove_link(struct class_compat *cls, struct device *dev,
+			      struct device *device_link)
+{
+	if (device_link)
+		sysfs_remove_link(&dev->kobj, "device");
+	sysfs_remove_link(cls->kobj, dev_name(dev));
+}
+EXPORT_SYMBOL_GPL(class_compat_remove_link);
+
 int __init classes_init(void)
 {
 	class_kset = kset_create_and_add("class", NULL, NULL);
diff --git a/drivers/base/core.c b/drivers/base/core.c
index 7ecb193..390e664 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -341,7 +341,7 @@ static void device_remove_attributes(struct device *dev,
 }
 
 static int device_add_groups(struct device *dev,
-			     struct attribute_group **groups)
+			     const struct attribute_group **groups)
 {
 	int error = 0;
 	int i;
@@ -361,7 +361,7 @@ static int device_add_groups(struct device *dev,
 }
 
 static void device_remove_groups(struct device *dev,
-				 struct attribute_group **groups)
+				 const struct attribute_group **groups)
 {
 	int i;
 
@@ -843,6 +843,17 @@ static void device_remove_sys_dev_entry(struct device *dev)
 	}
 }
 
+int device_private_init(struct device *dev)
+{
+	dev->p = kzalloc(sizeof(*dev->p), GFP_KERNEL);
+	if (!dev->p)
+		return -ENOMEM;
+	dev->p->device = dev;
+	klist_init(&dev->p->klist_children, klist_children_get,
+		   klist_children_put);
+	return 0;
+}
+
 /**
  * device_add - add device to device hierarchy.
  * @dev: device.
@@ -868,14 +879,11 @@ int device_add(struct device *dev)
 	if (!dev)
 		goto done;
 
-	dev->p = kzalloc(sizeof(*dev->p), GFP_KERNEL);
 	if (!dev->p) {
-		error = -ENOMEM;
-		goto done;
+		error = device_private_init(dev);
+		if (error)
+			goto done;
 	}
-	dev->p->device = dev;
-	klist_init(&dev->p->klist_children, klist_children_get,
-		   klist_children_put);
 
 	/*
 	 * for statically allocated devices, which should all be converted
@@ -921,6 +929,8 @@ int device_add(struct device *dev)
 		error = device_create_sys_dev_entry(dev);
 		if (error)
 			goto devtattrError;
+
+		devtmpfs_create_node(dev);
 	}
 
 	error = device_add_class_symlinks(dev);
@@ -945,7 +955,7 @@ int device_add(struct device *dev)
 					     BUS_NOTIFY_ADD_DEVICE, dev);
 
 	kobject_uevent(&dev->kobj, KOBJ_ADD);
-	bus_attach_device(dev);
+	bus_probe_device(dev);
 	if (parent)
 		klist_add_tail(&dev->p->knode_parent,
 			       &parent->p->klist_children);
@@ -1067,6 +1077,7 @@ void device_del(struct device *dev)
 	if (parent)
 		klist_del(&dev->p->knode_parent);
 	if (MAJOR(dev->devt)) {
+		devtmpfs_delete_node(dev);
 		device_remove_sys_dev_entry(dev);
 		device_remove_file(dev, &devt_attr);
 	}
diff --git a/drivers/base/dd.c b/drivers/base/dd.c
index 7b34b3a..979d159 100644
--- a/drivers/base/dd.c
+++ b/drivers/base/dd.c
@@ -11,8 +11,8 @@
  *
  * Copyright (c) 2002-5 Patrick Mochel
  * Copyright (c) 2002-3 Open Source Development Labs
- * Copyright (c) 2007 Greg Kroah-Hartman <gregkh@suse.de>
- * Copyright (c) 2007 Novell Inc.
+ * Copyright (c) 2007-2009 Greg Kroah-Hartman <gregkh@suse.de>
+ * Copyright (c) 2007-2009 Novell Inc.
  *
  * This file is released under the GPLv2
  */
@@ -391,3 +391,30 @@ void driver_detach(struct device_driver *drv)
 		put_device(dev);
 	}
 }
+
+/*
+ * These exports can't be _GPL due to .h files using this within them, and it
+ * might break something that was previously working...
+ */
+void *dev_get_drvdata(const struct device *dev)
+{
+	if (dev && dev->p)
+		return dev->p->driver_data;
+	return NULL;
+}
+EXPORT_SYMBOL(dev_get_drvdata);
+
+void dev_set_drvdata(struct device *dev, void *data)
+{
+	int error;
+
+	if (!dev)
+		return;
+	if (!dev->p) {
+		error = device_private_init(dev);
+		if (error)
+			return;
+	}
+	dev->p->driver_data = data;
+}
+EXPORT_SYMBOL(dev_set_drvdata);
diff --git a/drivers/base/devtmpfs.c b/drivers/base/devtmpfs.c
new file mode 100644
index 0000000..fd488ad
--- /dev/null
+++ b/drivers/base/devtmpfs.c
@@ -0,0 +1,367 @@
+/*
+ * devtmpfs - kernel-maintained tmpfs-based /dev
+ *
+ * Copyright (C) 2009, Kay Sievers <kay.sievers@vrfy.org>
+ *
+ * During bootup, before any driver core device is registered,
+ * devtmpfs, a tmpfs-based filesystem is created. Every driver-core
+ * device which requests a device node, will add a node in this
+ * filesystem. The node is named after the the name of the device,
+ * or the susbsytem can provide a custom name. All devices are
+ * owned by root and have a mode of 0600.
+ */
+
+#include <linux/kernel.h>
+#include <linux/syscalls.h>
+#include <linux/mount.h>
+#include <linux/device.h>
+#include <linux/genhd.h>
+#include <linux/namei.h>
+#include <linux/fs.h>
+#include <linux/shmem_fs.h>
+#include <linux/cred.h>
+#include <linux/init_task.h>
+
+static struct vfsmount *dev_mnt;
+
+#if defined CONFIG_DEVTMPFS_MOUNT
+static int dev_mount = 1;
+#else
+static int dev_mount;
+#endif
+
+static int __init mount_param(char *str)
+{
+	dev_mount = simple_strtoul(str, NULL, 0);
+	return 1;
+}
+__setup("devtmpfs.mount=", mount_param);
+
+static int dev_get_sb(struct file_system_type *fs_type, int flags,
+		      const char *dev_name, void *data, struct vfsmount *mnt)
+{
+	return get_sb_single(fs_type, flags, data, shmem_fill_super, mnt);
+}
+
+static struct file_system_type dev_fs_type = {
+	.name = "devtmpfs",
+	.get_sb = dev_get_sb,
+	.kill_sb = kill_litter_super,
+};
+
+#ifdef CONFIG_BLOCK
+static inline int is_blockdev(struct device *dev)
+{
+	return dev->class == &block_class;
+}
+#else
+static inline int is_blockdev(struct device *dev) { return 0; }
+#endif
+
+static int dev_mkdir(const char *name, mode_t mode)
+{
+	struct nameidata nd;
+	struct dentry *dentry;
+	int err;
+
+	err = vfs_path_lookup(dev_mnt->mnt_root, dev_mnt,
+			      name, LOOKUP_PARENT, &nd);
+	if (err)
+		return err;
+
+	dentry = lookup_create(&nd, 1);
+	if (!IS_ERR(dentry)) {
+		err = vfs_mkdir(nd.path.dentry->d_inode, dentry, mode);
+		dput(dentry);
+	} else {
+		err = PTR_ERR(dentry);
+	}
+	mutex_unlock(&nd.path.dentry->d_inode->i_mutex);
+
+	path_put(&nd.path);
+	return err;
+}
+
+static int create_path(const char *nodepath)
+{
+	char *path;
+	struct nameidata nd;
+	int err = 0;
+
+	path = kstrdup(nodepath, GFP_KERNEL);
+	if (!path)
+		return -ENOMEM;
+
+	err = vfs_path_lookup(dev_mnt->mnt_root, dev_mnt,
+			      path, LOOKUP_PARENT, &nd);
+	if (err == 0) {
+		struct dentry *dentry;
+
+		/* create directory right away */
+		dentry = lookup_create(&nd, 1);
+		if (!IS_ERR(dentry)) {
+			err = vfs_mkdir(nd.path.dentry->d_inode,
+					dentry, 0755);
+			dput(dentry);
+		}
+		mutex_unlock(&nd.path.dentry->d_inode->i_mutex);
+
+		path_put(&nd.path);
+	} else if (err == -ENOENT) {
+		char *s;
+
+		/* parent directories do not exist, create them */
+		s = path;
+		while (1) {
+			s = strchr(s, '/');
+			if (!s)
+				break;
+			s[0] = '\0';
+			err = dev_mkdir(path, 0755);
+			if (err && err != -EEXIST)
+				break;
+			s[0] = '/';
+			s++;
+		}
+	}
+
+	kfree(path);
+	return err;
+}
+
+int devtmpfs_create_node(struct device *dev)
+{
+	const char *tmp = NULL;
+	const char *nodename;
+	const struct cred *curr_cred;
+	mode_t mode;
+	struct nameidata nd;
+	struct dentry *dentry;
+	int err;
+
+	if (!dev_mnt)
+		return 0;
+
+	nodename = device_get_nodename(dev, &tmp);
+	if (!nodename)
+		return -ENOMEM;
+
+	if (is_blockdev(dev))
+		mode = S_IFBLK|0600;
+	else
+		mode = S_IFCHR|0600;
+
+	curr_cred = override_creds(&init_cred);
+	err = vfs_path_lookup(dev_mnt->mnt_root, dev_mnt,
+			      nodename, LOOKUP_PARENT, &nd);
+	if (err == -ENOENT) {
+		/* create missing parent directories */
+		create_path(nodename);
+		err = vfs_path_lookup(dev_mnt->mnt_root, dev_mnt,
+				      nodename, LOOKUP_PARENT, &nd);
+		if (err)
+			goto out;
+	}
+
+	dentry = lookup_create(&nd, 0);
+	if (!IS_ERR(dentry)) {
+		err = vfs_mknod(nd.path.dentry->d_inode,
+				dentry, mode, dev->devt);
+		/* mark as kernel created inode */
+		if (!err)
+			dentry->d_inode->i_private = &dev_mnt;
+		dput(dentry);
+	} else {
+		err = PTR_ERR(dentry);
+	}
+	mutex_unlock(&nd.path.dentry->d_inode->i_mutex);
+
+	path_put(&nd.path);
+out:
+	kfree(tmp);
+	revert_creds(curr_cred);
+	return err;
+}
+
+static int dev_rmdir(const char *name)
+{
+	struct nameidata nd;
+	struct dentry *dentry;
+	int err;
+
+	err = vfs_path_lookup(dev_mnt->mnt_root, dev_mnt,
+			      name, LOOKUP_PARENT, &nd);
+	if (err)
+		return err;
+
+	mutex_lock_nested(&nd.path.dentry->d_inode->i_mutex, I_MUTEX_PARENT);
+	dentry = lookup_one_len(nd.last.name, nd.path.dentry, nd.last.len);
+	if (!IS_ERR(dentry)) {
+		if (dentry->d_inode)
+			err = vfs_rmdir(nd.path.dentry->d_inode, dentry);
+		else
+			err = -ENOENT;
+		dput(dentry);
+	} else {
+		err = PTR_ERR(dentry);
+	}
+	mutex_unlock(&nd.path.dentry->d_inode->i_mutex);
+
+	path_put(&nd.path);
+	return err;
+}
+
+static int delete_path(const char *nodepath)
+{
+	const char *path;
+	int err = 0;
+
+	path = kstrdup(nodepath, GFP_KERNEL);
+	if (!path)
+		return -ENOMEM;
+
+	while (1) {
+		char *base;
+
+		base = strrchr(path, '/');
+		if (!base)
+			break;
+		base[0] = '\0';
+		err = dev_rmdir(path);
+		if (err)
+			break;
+	}
+
+	kfree(path);
+	return err;
+}
+
+static int dev_mynode(struct device *dev, struct inode *inode, struct kstat *stat)
+{
+	/* did we create it */
+	if (inode->i_private != &dev_mnt)
+		return 0;
+
+	/* does the dev_t match */
+	if (is_blockdev(dev)) {
+		if (!S_ISBLK(stat->mode))
+			return 0;
+	} else {
+		if (!S_ISCHR(stat->mode))
+			return 0;
+	}
+	if (stat->rdev != dev->devt)
+		return 0;
+
+	/* ours */
+	return 1;
+}
+
+int devtmpfs_delete_node(struct device *dev)
+{
+	const char *tmp = NULL;
+	const char *nodename;
+	const struct cred *curr_cred;
+	struct nameidata nd;
+	struct dentry *dentry;
+	struct kstat stat;
+	int deleted = 1;
+	int err;
+
+	if (!dev_mnt)
+		return 0;
+
+	nodename = device_get_nodename(dev, &tmp);
+	if (!nodename)
+		return -ENOMEM;
+
+	curr_cred = override_creds(&init_cred);
+	err = vfs_path_lookup(dev_mnt->mnt_root, dev_mnt,
+			      nodename, LOOKUP_PARENT, &nd);
+	if (err)
+		goto out;
+
+	mutex_lock_nested(&nd.path.dentry->d_inode->i_mutex, I_MUTEX_PARENT);
+	dentry = lookup_one_len(nd.last.name, nd.path.dentry, nd.last.len);
+	if (!IS_ERR(dentry)) {
+		if (dentry->d_inode) {
+			err = vfs_getattr(nd.path.mnt, dentry, &stat);
+			if (!err && dev_mynode(dev, dentry->d_inode, &stat)) {
+				err = vfs_unlink(nd.path.dentry->d_inode,
+						 dentry);
+				if (!err || err == -ENOENT)
+					deleted = 1;
+			}
+		} else {
+			err = -ENOENT;
+		}
+		dput(dentry);
+	} else {
+		err = PTR_ERR(dentry);
+	}
+	mutex_unlock(&nd.path.dentry->d_inode->i_mutex);
+
+	path_put(&nd.path);
+	if (deleted && strchr(nodename, '/'))
+		delete_path(nodename);
+out:
+	kfree(tmp);
+	revert_creds(curr_cred);
+	return err;
+}
+
+/*
+ * If configured, or requested by the commandline, devtmpfs will be
+ * auto-mounted after the kernel mounted the root filesystem.
+ */
+int devtmpfs_mount(const char *mountpoint)
+{
+	struct path path;
+	int err;
+
+	if (!dev_mount)
+		return 0;
+
+	if (!dev_mnt)
+		return 0;
+
+	err = kern_path(mountpoint, LOOKUP_FOLLOW, &path);
+	if (err)
+		return err;
+	err = do_add_mount(dev_mnt, &path, 0, NULL);
+	if (err)
+		printk(KERN_INFO "devtmpfs: error mounting %i\n", err);
+	else
+		printk(KERN_INFO "devtmpfs: mounted\n");
+	path_put(&path);
+	return err;
+}
+
+/*
+ * Create devtmpfs instance, driver-core devices will add their device
+ * nodes here.
+ */
+int __init devtmpfs_init(void)
+{
+	int err;
+	struct vfsmount *mnt;
+
+	err = register_filesystem(&dev_fs_type);
+	if (err) {
+		printk(KERN_ERR "devtmpfs: unable to register devtmpfs "
+		       "type %i\n", err);
+		return err;
+	}
+
+	mnt = kern_mount(&dev_fs_type);
+	if (IS_ERR(mnt)) {
+		err = PTR_ERR(mnt);
+		printk(KERN_ERR "devtmpfs: unable to create devtmpfs %i\n", err);
+		unregister_filesystem(&dev_fs_type);
+		return err;
+	}
+	dev_mnt = mnt;
+
+	printk(KERN_INFO "devtmpfs: initialized\n");
+	return 0;
+}
diff --git a/drivers/base/dma-coherent.c b/drivers/base/dma-coherent.c
new file mode 100644
index 0000000..962a3b5
--- /dev/null
+++ b/drivers/base/dma-coherent.c
@@ -0,0 +1,176 @@
+/*
+ * Coherent per-device memory handling.
+ * Borrowed from i386
+ */
+#include <linux/kernel.h>
+#include <linux/dma-mapping.h>
+
+struct dma_coherent_mem {
+	void		*virt_base;
+	u32		device_base;
+	int		size;
+	int		flags;
+	unsigned long	*bitmap;
+};
+
+int dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
+				dma_addr_t device_addr, size_t size, int flags)
+{
+	void __iomem *mem_base = NULL;
+	int pages = size >> PAGE_SHIFT;
+	int bitmap_size = BITS_TO_LONGS(pages) * sizeof(long);
+
+	if ((flags & (DMA_MEMORY_MAP | DMA_MEMORY_IO)) == 0)
+		goto out;
+	if (!size)
+		goto out;
+	if (dev->dma_mem)
+		goto out;
+
+	/* FIXME: this routine just ignores DMA_MEMORY_INCLUDES_CHILDREN */
+
+	mem_base = ioremap(bus_addr, size);
+	if (!mem_base)
+		goto out;
+
+	dev->dma_mem = kzalloc(sizeof(struct dma_coherent_mem), GFP_KERNEL);
+	if (!dev->dma_mem)
+		goto out;
+	dev->dma_mem->bitmap = kzalloc(bitmap_size, GFP_KERNEL);
+	if (!dev->dma_mem->bitmap)
+		goto free1_out;
+
+	dev->dma_mem->virt_base = mem_base;
+	dev->dma_mem->device_base = device_addr;
+	dev->dma_mem->size = pages;
+	dev->dma_mem->flags = flags;
+
+	if (flags & DMA_MEMORY_MAP)
+		return DMA_MEMORY_MAP;
+
+	return DMA_MEMORY_IO;
+
+ free1_out:
+	kfree(dev->dma_mem);
+ out:
+	if (mem_base)
+		iounmap(mem_base);
+	return 0;
+}
+EXPORT_SYMBOL(dma_declare_coherent_memory);
+
+void dma_release_declared_memory(struct device *dev)
+{
+	struct dma_coherent_mem *mem = dev->dma_mem;
+
+	if (!mem)
+		return;
+	dev->dma_mem = NULL;
+	iounmap(mem->virt_base);
+	kfree(mem->bitmap);
+	kfree(mem);
+}
+EXPORT_SYMBOL(dma_release_declared_memory);
+
+void *dma_mark_declared_memory_occupied(struct device *dev,
+					dma_addr_t device_addr, size_t size)
+{
+	struct dma_coherent_mem *mem = dev->dma_mem;
+	int pos, err;
+
+	size += device_addr & ~PAGE_MASK;
+
+	if (!mem)
+		return ERR_PTR(-EINVAL);
+
+	pos = (device_addr - mem->device_base) >> PAGE_SHIFT;
+	err = bitmap_allocate_region(mem->bitmap, pos, get_order(size));
+	if (err != 0)
+		return ERR_PTR(err);
+	return mem->virt_base + (pos << PAGE_SHIFT);
+}
+EXPORT_SYMBOL(dma_mark_declared_memory_occupied);
+
+/**
+ * dma_alloc_from_coherent() - try to allocate memory from the per-device coherent area
+ *
+ * @dev:	device from which we allocate memory
+ * @size:	size of requested memory area
+ * @dma_handle:	This will be filled with the correct dma handle
+ * @ret:	This pointer will be filled with the virtual address
+ *		to allocated area.
+ *
+ * This function should be only called from per-arch dma_alloc_coherent()
+ * to support allocation from per-device coherent memory pools.
+ *
+ * Returns 0 if dma_alloc_coherent should continue with allocating from
+ * generic memory areas, or !0 if dma_alloc_coherent should return @ret.
+ */
+int dma_alloc_from_coherent(struct device *dev, ssize_t size,
+				       dma_addr_t *dma_handle, void **ret)
+{
+	struct dma_coherent_mem *mem;
+	int order = get_order(size);
+	int pageno;
+
+	if (!dev)
+		return 0;
+	mem = dev->dma_mem;
+	if (!mem)
+		return 0;
+
+	*ret = NULL;
+
+	if (unlikely(size > (mem->size << PAGE_SHIFT)))
+		goto err;
+
+	pageno = bitmap_find_free_region(mem->bitmap, mem->size, order);
+	if (unlikely(pageno < 0))
+		goto err;
+
+	/*
+	 * Memory was found in the per-device area.
+	 */
+	*dma_handle = mem->device_base + (pageno << PAGE_SHIFT);
+	*ret = mem->virt_base + (pageno << PAGE_SHIFT);
+	memset(*ret, 0, size);
+
+	return 1;
+
+err:
+	/*
+	 * In the case where the allocation can not be satisfied from the
+	 * per-device area, try to fall back to generic memory if the
+	 * constraints allow it.
+	 */
+	return mem->flags & DMA_MEMORY_EXCLUSIVE;
+}
+EXPORT_SYMBOL(dma_alloc_from_coherent);
+
+/**
+ * dma_release_from_coherent() - try to free the memory allocated from per-device coherent memory pool
+ * @dev:	device from which the memory was allocated
+ * @order:	the order of pages allocated
+ * @vaddr:	virtual address of allocated pages
+ *
+ * This checks whether the memory was allocated from the per-device
+ * coherent memory pool and if so, releases that memory.
+ *
+ * Returns 1 if we correctly released the memory, or 0 if
+ * dma_release_coherent() should proceed with releasing memory from
+ * generic pools.
+ */
+int dma_release_from_coherent(struct device *dev, int order, void *vaddr)
+{
+	struct dma_coherent_mem *mem = dev ? dev->dma_mem : NULL;
+
+	if (mem && vaddr >= mem->virt_base && vaddr <
+		   (mem->virt_base + (mem->size << PAGE_SHIFT))) {
+		int page = (vaddr - mem->virt_base) >> PAGE_SHIFT;
+
+		bitmap_release_region(mem->bitmap, page, order);
+		return 1;
+	}
+	return 0;
+}
+EXPORT_SYMBOL(dma_release_from_coherent);
diff --git a/drivers/base/driver.c b/drivers/base/driver.c
index 8ae0f63..ed2ebd3 100644
--- a/drivers/base/driver.c
+++ b/drivers/base/driver.c
@@ -181,7 +181,7 @@ void put_driver(struct device_driver *drv)
 EXPORT_SYMBOL_GPL(put_driver);
 
 static int driver_add_groups(struct device_driver *drv,
-			     struct attribute_group **groups)
+			     const struct attribute_group **groups)
 {
 	int error = 0;
 	int i;
@@ -201,7 +201,7 @@ static int driver_add_groups(struct device_driver *drv,
 }
 
 static void driver_remove_groups(struct device_driver *drv,
-				 struct attribute_group **groups)
+				 const struct attribute_group **groups)
 {
 	int i;
 
diff --git a/drivers/base/init.c b/drivers/base/init.c
index 7bd9b6a..c8a934e 100644
--- a/drivers/base/init.c
+++ b/drivers/base/init.c
@@ -20,6 +20,7 @@
 void __init driver_init(void)
 {
 	/* These are the core pieces */
+	devtmpfs_init();
 	devices_init();
 	buses_init();
 	classes_init();
diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index 0f7d434..ed156a13 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -10,6 +10,7 @@
  * information.
  */
 
+#include <linux/string.h>
 #include <linux/platform_device.h>
 #include <linux/module.h>
 #include <linux/init.h>
@@ -213,14 +214,13 @@ EXPORT_SYMBOL_GPL(platform_device_add_resources);
 int platform_device_add_data(struct platform_device *pdev, const void *data,
 			     size_t size)
 {
-	void *d;
+	void *d = kmemdup(data, size, GFP_KERNEL);
 
-	d = kmalloc(size, GFP_KERNEL);
 	if (d) {
-		memcpy(d, data, size);
 		pdev->dev.platform_data = d;
+		return 0;
 	}
-	return d ? 0 : -ENOMEM;
+	return -ENOMEM;
 }
 EXPORT_SYMBOL_GPL(platform_device_add_data);