Merge bk://kernel.bkbits.net/gregkh/linux/driver-2.6

into ppc970.osdl.org:/home/torvalds/v2.6/linux

drivers/base/power/resume.c

@@ -35,7 +35,10 @@ void dpm_resume(void)
 		struct list_head * entry = dpm_off.next;
 		struct device * dev = to_device(entry);
 		list_del_init(entry);
-		resume_device(dev);
+
+		if (!dev->power.prev_state)
+			resume_device(dev);
+
 		list_add_tail(entry,&dpm_active);
 	}
 }

drivers/base/power/runtime.c

@@ -12,9 +12,11 @@
 
 static void runtime_resume(struct device * dev)
 {
+	dev_dbg(dev, "resuming\n");
 	if (!dev->power.power_state)
 		return;
-	resume_device(dev);
+	if (!resume_device(dev))
+		dev->power.power_state = 0;
 }
 
 

drivers/base/power/suspend.c

@@ -39,16 +39,13 @@ int suspend_device(struct device * dev, u32 state)
 {
 	int error = 0;
 
-	if (dev->bus && dev->bus->suspend)
+	dev_dbg(dev, "suspending\n");
+
+	dev->power.prev_state = dev->power.power_state;
+
+	if (dev->bus && dev->bus->suspend && !dev->power.power_state)
 		error = dev->bus->suspend(dev,state);
 
-	if (!error) {
-		list_del(&dev->power.entry);
-		list_add(&dev->power.entry,&dpm_off);
-	} else if (error == -EAGAIN) {
-		list_del(&dev->power.entry);
-		list_add(&dev->power.entry,&dpm_off_irq);
-	}
 	return error;
 }
 
@@ -81,11 +78,18 @@ int device_suspend(u32 state)
 	while(!list_empty(&dpm_active)) {
 		struct list_head * entry = dpm_active.prev;
 		struct device * dev = to_device(entry);
-		if ((error = suspend_device(dev,state))) {
-			if (error != -EAGAIN)
-				goto Error;
-			else
-				error = 0;
+		error = suspend_device(dev,state);
+
+		if (!error) {
+			list_del(&dev->power.entry);
+			list_add(&dev->power.entry,&dpm_off);
+		} else if (error == -EAGAIN) {
+			list_del(&dev->power.entry);
+			list_add(&dev->power.entry,&dpm_off_irq);
+		} else {
+			printk(KERN_ERR "Could not suspend device %s: "
+				"error %d\n", kobject_name(&dev->kobj), error);
+			goto Error;
 		}
 	}
  Done:

drivers/firmware/Kconfig

@@ -34,12 +34,4 @@ config EFI_VARS
 	  Subsequent efibootmgr releases may be found at:
 	  http://linux.dell.com/efibootmgr
 
-config SMBIOS
-	tristate "BIOS SMBIOS table access driver."
-	help
-	  Say Y or M here if you want to enable access to the SMBIOS table
-	  via driverfs. It exposes /sys/firmware/smbios/ subdirectory tree
-	  containing a binary dump of the SMBIOS table header as well as the SMBIOS
-	  table.
-
 endmenu

drivers/firmware/Makefile

@@ -3,4 +3,3 @@
 #
 obj-$(CONFIG_EDD)             	+= edd.o
 obj-$(CONFIG_EFI_VARS)		+= efivars.o
-obj-$(CONFIG_SMBIOS)            += smbios.o

drivers/firmware/smbios.c

-/*
- * linux/drivers/firmware/smbios.c
- *  Copyright (C) 2004 Dell Inc.
- *  by Michael Brown <Michael_E_Brown@dell.com>
- *  vim:noet:ts=8:sw=8:filetype=c:textwidth=80:
- *
- * BIOS SMBIOS Table access
- * conformant to DMTF SMBIOS definition
- *   at http://www.dmtf.org/standards/smbios
- *
- * This code takes information provided by SMBIOS tables
- * and presents it in sysfs as:
- *    /sys/firmware/smbios
- *			|--> /table_entry_point
- *			|--> /table
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License v2.0 as published by
- * the Free Software Foundation
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- */
-
-
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/device.h>
-#include <asm/io.h>
-#include <asm/uaccess.h>
-#include "smbios.h"
-
-MODULE_AUTHOR("Michael Brown <Michael_E_Brown@Dell.com>");
-MODULE_DESCRIPTION("sysfs interface to SMBIOS information");
-MODULE_LICENSE("GPL");
-
-#define SMBIOS_VERSION "1.0 2004-04-19"
-
-struct smbios_device {
-	struct smbios_table_entry_point table_eps;
-	unsigned int smbios_table_real_length;
-};
-
-/* there shall be only one */
-static struct smbios_device the_smbios_device;
-
-#define to_smbios_device(obj) container_of(obj,struct smbios_device,kobj)
-
-/* don't currently have any "normal" attributes, so we don't need a way to
- * show them. */
-static struct sysfs_ops smbios_attr_ops = { };
-
-static __init int
-checksum_eps(struct smbios_table_entry_point *table_eps)
-{
-	u8 *p = (u8 *)table_eps;
-	u8 checksum = 0;
-	int i=0;
-	for (i=0; i < table_eps->eps_length && i < sizeof(*table_eps); ++i) {
-		checksum += p[i];
-	}
-	return( checksum == 0 );
-}
-
-static __init int
-find_table_entry_point(struct smbios_device *sdev)
-{
-	struct smbios_table_entry_point *table_eps = &(sdev->table_eps);
-	u32 fp = 0xF0000;
-	while (fp < 0xFFFFF) {
-		isa_memcpy_fromio(table_eps, fp, sizeof(*table_eps));
-		if (memcmp(table_eps->anchor, "_SM_", 4)==0 &&
-					checksum_eps(table_eps)) {
-			return 0;
-		}
-		fp += 16;
-	}
-
-	printk(KERN_INFO "SMBIOS table entry point not found in "
-			"0xF0000 - 0xFFFFF\n");
-	return -ENODEV;
-}
-
-static __init int
-find_table_max_address(struct smbios_device *sdev)
-{
-	/* break out on one of three conditions:
-	 *   -- hit table_eps.table_length
-	 *   -- hit number of items that table claims we have
-	 *   -- hit structure type 127
-	 */
-
-	u8 *buf = ioremap(sdev->table_eps.table_address,
-			sdev->table_eps.table_length);
-	u8 *ptr = buf;
-	int count = 0, keep_going = 1;
-	int max_count = sdev->table_eps.table_num_structs;
-	int max_length = sdev->table_eps.table_length;
-	while(keep_going && ((ptr - buf) <= max_length) && count < max_count){
-		if( ptr[0] == 0x7F )   /* ptr[0] is type */
-			keep_going = 0;
-
-		ptr += ptr[1]; /* ptr[1] is length, skip structure */
-		/* skip strings at end of structure */
-		while((ptr-buf) < max_length && (ptr[0] || ptr[1]))
-			++ptr;
-
-		/* string area ends in double-null. skip it. */
-		ptr += 2;
-		++count;
-	}
-	sdev->smbios_table_real_length = (ptr - buf);
-	iounmap(buf);
-
-	if( count != max_count )
-		printk(KERN_INFO "Warning: SMBIOS table structure count"
-				" does not match count specified in the"
-				" table entry point.\n"
-				" Table entry point count: %d\n"
-				" Actual count: %d\n",
-				max_count, count );
-
-	if(keep_going != 0)
-		printk(KERN_INFO "Warning: SMBIOS table does not end with a"
-				" structure type 127. This may indicate a"
-				" truncated table.");
-
-	if(sdev->smbios_table_real_length != max_length)
-		printk(KERN_INFO "Warning: BIOS specified SMBIOS table length"
-				" does not match calculated length.\n"
-				" BIOS specified: %d\n"
-				" calculated length: %d\n",
-				max_length, sdev->smbios_table_real_length);
-
-	return sdev->smbios_table_real_length;
-}
-
-static ssize_t
-smbios_read_table_entry_point(struct kobject *kobj, char *buffer,
-				loff_t pos, size_t size)
-{
-	struct smbios_device *sdev = &the_smbios_device;
-	const char *p = (const char *)&(sdev->table_eps);
-	unsigned int count =
-		size > sizeof(sdev->table_eps) ?
-			sizeof(sdev->table_eps) : size;
-	memcpy( buffer, p, count );
-	return count;
-}
-
-static ssize_t
-smbios_read_table(struct kobject *kobj, char *buffer,
-				loff_t pos, size_t size)
-{
-	struct smbios_device *sdev = &the_smbios_device;
-	u8 *buf;
-	unsigned int count = sdev->smbios_table_real_length - pos;
-	int i = 0;
-	count = count < size ? count : size;
-
-	if (pos > sdev->smbios_table_real_length)
-		return 0;
-
-	buf = ioremap(sdev->table_eps.table_address, sdev->smbios_table_real_length);
-	if (buf == NULL)
-		return -ENXIO;
-
-	/* memcpy( buffer, buf+pos, count ); */
-	for (i = 0; i < count; ++i) {
-		buffer[i] = readb( buf+pos+i );
-	}
-
-	iounmap(buf);
-
-	return count;
-}
-
-static struct bin_attribute tep_attr = {
-	.attr = {.name = "table_entry_point", .owner = THIS_MODULE, .mode = 0444},
-	.size = sizeof(struct smbios_table_entry_point),
-	.read = smbios_read_table_entry_point,
-	/* not writeable */
-};
-
-static struct bin_attribute table_attr = {
-	.attr = { .name = "table", .owner = THIS_MODULE, .mode = 0444 },
-	/* size set later, we don't know it here. */
-	.read = smbios_read_table,
-	/* not writeable */
-};
-
-/* no default attributes yet. */
-static struct attribute * def_attrs[] = { NULL, };
-
-static struct kobj_type ktype_smbios = {
-	.sysfs_ops	= &smbios_attr_ops,
-	.default_attrs	= def_attrs,
-	/* statically allocated, no release method necessary */
-};
-
-static decl_subsys(smbios,&ktype_smbios,NULL);
-
-static void smbios_device_unregister(void)
-{
-	sysfs_remove_bin_file(&smbios_subsys.kset.kobj, &tep_attr );
-	sysfs_remove_bin_file(&smbios_subsys.kset.kobj, &table_attr );
-}
-
-static void __init smbios_device_register(void)
-{
-	sysfs_create_bin_file(&smbios_subsys.kset.kobj, &tep_attr );
-	sysfs_create_bin_file(&smbios_subsys.kset.kobj, &table_attr );
-}
-
-static int __init
-smbios_init(void)
-{
-	int rc=0;
-
-	printk(KERN_INFO "SMBIOS facility v%s\n", SMBIOS_VERSION );
-
-	rc = find_table_entry_point(&the_smbios_device);
-	if (rc)
-		return rc;
-
-	table_attr.size = find_table_max_address(&the_smbios_device);
-
-	rc = firmware_register(&smbios_subsys);
-	if (rc)
-		return rc;
-
-	smbios_device_register();
-
-	return rc;
-}
-
-static void __exit
-smbios_exit(void)
-{
-	smbios_device_unregister();
-	firmware_unregister(&smbios_subsys);
-}
-
-late_initcall(smbios_init);
-module_exit(smbios_exit);

drivers/firmware/smbios.h

-/*
- * linux/drivers/firmware/smbios.c
- *  Copyright (C) 2002, 2003, 2004 Dell Inc.
- *  by Michael Brown <Michael_E_Brown@dell.com>
- *  vim:noet:ts=8:sw=8:filetype=c:textwidth=80:
- *
- * BIOS SMBIOS Table access 
- * conformant to DMTF SMBIOS definition
- *   at http://www.dmtf.org/standards/smbios
- *
- * This code takes information provided by SMBIOS tables
- * and presents it in sysfs.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License v2.0 as published by
- * the Free Software Foundation
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- */
-
-#ifndef _LINUX_SMBIOS_H
-#define _LINUX_SMBIOS_H
-
-#include <linux/types.h>
-
-struct smbios_table_entry_point {
-	u8 anchor[4];
-	u8 checksum;
-	u8 eps_length;
-	u8 major_ver;
-	u8 minor_ver;
-	u16 max_struct_size;
-	u8 revision;
-	u8 formatted_area[5];
-	u8 dmi_anchor[5];
-	u8 intermediate_checksum;
-	u16 table_length;
-	u32 table_address;
-	u16 table_num_structs;
-	u8 smbios_bcd_revision;
-} __attribute__ ((packed));
-
-struct smbios_structure_header {
-	u8 type;
-	u8 length;
-	u16 handle;
-} __attribute__ ((packed));
-
-#endif				/* _LINUX_SMBIOS_H */

fs/sysfs/dir.c

@@ -10,6 +10,8 @@
 #include <linux/kobject.h>
 #include "sysfs.h"
 
+DECLARE_RWSEM(sysfs_rename_sem);
+
 static int init_dir(struct inode * inode)
 {
 	inode->i_op = &simple_dir_inode_operations;
@@ -134,8 +136,14 @@ void sysfs_remove_dir(struct kobject * kobj)
 			/**
 			 * Unlink and unhash.
 			 */
+			__d_drop(d);
 			spin_unlock(&dcache_lock);
-			d_delete(d);
+			/* release the target kobject in case of 
+			 * a symlink
+			 */
+			if (S_ISLNK(d->d_inode->i_mode))
+				kobject_put(d->d_fsdata);
+			
 			simple_unlink(dentry->d_inode,d);
 			dput(d);
 			pr_debug(" done\n");
@@ -165,6 +173,7 @@ int sysfs_rename_dir(struct kobject * kobj, const char *new_name)
 	if (!kobj->parent)
 		return -EINVAL;
 
+	down_write(&sysfs_rename_sem);
 	parent = kobj->parent->dentry;
 
 	down(&parent->d_inode->i_sem);
@@ -179,6 +188,7 @@ int sysfs_rename_dir(struct kobject * kobj, const char *new_name)
 		dput(new_dentry);
 	}
 	up(&parent->d_inode->i_sem);	
+	up_write(&sysfs_rename_sem);
 
 	return error;
 }

fs/sysfs/inode.c

@@ -96,7 +96,12 @@ void sysfs_hash_and_remove(struct dentry * dir, const char * name)
 			pr_debug("sysfs: Removing %s (%d)\n", victim->d_name.name,
 				 atomic_read(&victim->d_count));
 
-			d_delete(victim);
+			d_drop(victim);
+			/* release the target kobject in case of 
+			 * a symlink
+			 */
+			if (S_ISLNK(victim->d_inode->i_mode))
+				kobject_put(victim->d_fsdata);
 			simple_unlink(dir->d_inode,victim);
 		}
 		/*

fs/sysfs/symlink.c

@@ -8,27 +8,17 @@
 
 #include "sysfs.h"
 
+static struct inode_operations sysfs_symlink_inode_operations = {
+	.readlink = sysfs_readlink,
+	.follow_link = sysfs_follow_link,
+};
 
 static int init_symlink(struct inode * inode)
 {
-	inode->i_op = &page_symlink_inode_operations;
+	inode->i_op = &sysfs_symlink_inode_operations;
 	return 0;
 }
 
-static int sysfs_symlink(struct inode * dir, struct dentry *dentry, const char * symname)
-{
-	int error;
-
-	error = sysfs_create(dentry, S_IFLNK|S_IRWXUGO, init_symlink);
-	if (!error) {
-		int l = strlen(symname)+1;
-		error = page_symlink(dentry->d_inode, symname, l);
-		if (error)
-			iput(dentry->d_inode);
-	}
-	return error;
-}
-
 static int object_depth(struct kobject * kobj)
 {
 	struct kobject * p = kobj;
@@ -74,37 +64,20 @@ int sysfs_create_link(struct kobject * kobj, struct kobject * target, char * nam
 	struct dentry * dentry = kobj->dentry;
 	struct dentry * d;
 	int error = 0;
-	int size;
-	int depth;
-	char * path;
-	char * s;
-
-	depth = object_depth(kobj);
-	size = object_path_length(target) + depth * 3 - 1;
-	if (size > PATH_MAX)
-		return -ENAMETOOLONG;
-	pr_debug("%s: depth = %d, size = %d\n",__FUNCTION__,depth,size);
-
-	path = kmalloc(size,GFP_KERNEL);
-	if (!path)
-		return -ENOMEM;
-	memset(path,0,size);
-
-	for (s = path; depth--; s += 3)
-		strcpy(s,"../");
-
-	fill_object_path(target,path,size);
-	pr_debug("%s: path = '%s'\n",__FUNCTION__,path);
 
 	down(&dentry->d_inode->i_sem);
 	d = sysfs_get_dentry(dentry,name);
-	if (!IS_ERR(d))
-		error = sysfs_symlink(dentry->d_inode,d,path);
-	else
+	if (!IS_ERR(d)) {
+		error = sysfs_create(d, S_IFLNK|S_IRWXUGO, init_symlink);
+		if (!error)
+			/* 
+			 * associate the link dentry with the target kobject 
+			 */
+			d->d_fsdata = kobject_get(target);
+		dput(d);
+	} else 
 		error = PTR_ERR(d);
-	dput(d);
 	up(&dentry->d_inode->i_sem);
-	kfree(path);
 	return error;
 }
 
@@ -120,6 +93,86 @@ void sysfs_remove_link(struct kobject * kobj, char * name)
 	sysfs_hash_and_remove(kobj->dentry,name);
 }
 
+static int sysfs_get_target_path(struct kobject * kobj, struct kobject * target,
+				   char *path)
+{
+	char * s;
+	int depth, size;
+
+	depth = object_depth(kobj);
+	size = object_path_length(target) + depth * 3 - 1;
+	if (size > PATH_MAX)
+		return -ENAMETOOLONG;
+
+	pr_debug("%s: depth = %d, size = %d\n", __FUNCTION__, depth, size);
+
+	for (s = path; depth--; s += 3)
+		strcpy(s,"../");
+
+	fill_object_path(target, path, size);
+	pr_debug("%s: path = '%s'\n", __FUNCTION__, path);
+
+	return 0;
+}
+
+static int sysfs_getlink(struct dentry *dentry, char * path)
+{
+	struct kobject *kobj, *target_kobj;
+	int error = 0;
+
+	kobj = sysfs_get_kobject(dentry->d_parent);
+	if (!kobj)
+		return -EINVAL;
+
+	target_kobj = sysfs_get_kobject(dentry);
+	if (!target_kobj) {
+		kobject_put(kobj);
+		return -EINVAL;
+	}
+
+	down_read(&sysfs_rename_sem);
+	error = sysfs_get_target_path(kobj, target_kobj, path);
+	up_read(&sysfs_rename_sem);
+	
+	kobject_put(kobj);
+	kobject_put(target_kobj);
+	return error;
+
+}
+
+int sysfs_readlink(struct dentry *dentry, char __user *buffer, int buflen)
+{
+	int error = 0;
+	unsigned long page = get_zeroed_page(GFP_KERNEL);
+
+	if (!page)
+		return -ENOMEM;
+
+	error = sysfs_getlink(dentry, (char *) page);
+	if (!error)
+	        error = vfs_readlink(dentry, buffer, buflen, (char *) page);
+
+	free_page(page);
+
+	return error;
+}
+
+int sysfs_follow_link(struct dentry *dentry, struct nameidata *nd)
+{
+	int error = 0;
+	unsigned long page = get_zeroed_page(GFP_KERNEL);
+
+	if (!page)
+		return -ENOMEM;
+
+	error = sysfs_getlink(dentry, (char *) page); 
+	if (!error)
+	        error = vfs_follow_link(nd, (char *) page);
+
+	free_page(page);
+
+	return error;
+}
 
 EXPORT_SYMBOL(sysfs_create_link);
 EXPORT_SYMBOL(sysfs_remove_link);

fs/sysfs/sysfs.h

@@ -12,15 +12,18 @@ extern void sysfs_hash_and_remove(struct dentry * dir, const char * name);
 extern int sysfs_create_subdir(struct kobject *, const char *, struct dentry **);
 extern void sysfs_remove_subdir(struct dentry *);
 
+extern int sysfs_readlink(struct dentry *, char __user *, int );
+extern int sysfs_follow_link(struct dentry *, struct nameidata *);
+extern struct rw_semaphore sysfs_rename_sem;
 
 static inline struct kobject *sysfs_get_kobject(struct dentry *dentry)
 {
 	struct kobject * kobj = NULL;
 
-	spin_lock(&dentry->d_lock);
+	spin_lock(&dcache_lock);
 	if (!d_unhashed(dentry))
 		kobj = kobject_get(dentry->d_fsdata);
-	spin_unlock(&dentry->d_lock);
+	spin_unlock(&dcache_lock);
 
 	return kobj;
 }

include/linux/pm.h

@@ -231,6 +231,7 @@ struct device;
 struct dev_pm_info {
 	u32			power_state;
 #ifdef	CONFIG_PM
+	u32			prev_state;
 	u8			* saved_state;
 	atomic_t		pm_users;
 	struct device		* pm_parent;