driver core: remove CONFIG_SYSFS_DEPRECATED_V2 but keep it for block devices

This patch removes the old CONFIG_SYSFS_DEPRECATED_V2 config option,
but it keeps the logic around to handle block devices in the old manner
as some people like to run new kernel versions on old (pre 2007/2008)
distros.

Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Stephen Hemminger <shemminger@vyatta.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: "James E.J. Bottomley" <James.Bottomley@suse.de>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
Cc: Randy Dunlap <randy.dunlap@oracle.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Jaroslav Kysela <perex@perex.cz>
Cc: Takashi Iwai <tiwai@suse.de>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: David Howells <dhowells@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

8 files changed, 43 insertions, 259 deletions

diff --git a/drivers/base/bus.c b/drivers/base/bus.c
index eb1b7fa20dce..33c270a64db7 100644
--- a/drivers/base/bus.c
+++ b/drivers/base/bus.c
@@ -440,22 +440,6 @@ static void device_remove_attrs(struct bus_type *bus, struct device *dev)
         }
 }
 
-#ifdef CONFIG_SYSFS_DEPRECATED
-static int make_deprecated_bus_links(struct device *dev)
-{
-        return sysfs_create_link(&dev->kobj,
-                                 &dev->bus->p->subsys.kobj, "bus");
-}
-
-static void remove_deprecated_bus_links(struct device *dev)
-{
-        sysfs_remove_link(&dev->kobj, "bus");
-}
-#else
-static inline int make_deprecated_bus_links(struct device *dev) { return 0; }
-static inline void remove_deprecated_bus_links(struct device *dev) { }
-#endif
-
 /**
  * bus_add_device - add device to bus
  * @dev: device being added
@@ -482,15 +466,10 @@ int bus_add_device(struct device *dev)
                                 &dev->bus->p->subsys.kobj, "subsystem");
                 if (error)
                         goto out_subsys;
-                error = make_deprecated_bus_links(dev);
-                if (error)
-                        goto out_deprecated;
                 klist_add_tail(&dev->p->knode_bus, &bus->p->klist_devices);
         }
         return 0;
 
-out_deprecated:
-        sysfs_remove_link(&dev->kobj, "subsystem");
 out_subsys:
         sysfs_remove_link(&bus->p->devices_kset->kobj, dev_name(dev));
 out_id:
@@ -530,7 +509,6 @@ void bus_remove_device(struct device *dev)
 {
         if (dev->bus) {
                 sysfs_remove_link(&dev->kobj, "subsystem");
-                remove_deprecated_bus_links(dev);
                 sysfs_remove_link(&dev->bus->p->devices_kset->kobj,
                                   dev_name(dev));
                 device_remove_attrs(dev->bus, dev);
diff --git a/drivers/base/class.c b/drivers/base/class.c
index 8e231d05b400..1078969889fd 100644
--- a/drivers/base/class.c
+++ b/drivers/base/class.c
@@ -276,25 +276,6 @@ void class_destroy(struct class *cls)
         class_unregister(cls);
 }
 
-#ifdef CONFIG_SYSFS_DEPRECATED
-char *make_class_name(const char *name, struct kobject *kobj)
-{
-        char *class_name;
-        int size;
-
-        size = strlen(name) + strlen(kobject_name(kobj)) + 2;
-
-        class_name = kmalloc(size, GFP_KERNEL);
-        if (!class_name)
-                return NULL;
-
-        strcpy(class_name, name);
-        strcat(class_name, ":");
-        strcat(class_name, kobject_name(kobj));
-        return class_name;
-}
-#endif
-
 /**
  * class_dev_iter_init - initialize class device iterator
  * @iter: class iterator to initialize
diff --git a/drivers/base/core.c b/drivers/base/core.c
index d1b2c9adc271..6cf9069f3150 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -203,37 +203,6 @@ static int dev_uevent(struct kset *kset, struct kobject *kobj,
         if (dev->driver)
                 add_uevent_var(env, "DRIVER=%s", dev->driver->name);
 
-#ifdef CONFIG_SYSFS_DEPRECATED
-        if (dev->class) {
-                struct device *parent = dev->parent;
-
-                /* find first bus device in parent chain */
-                while (parent && !parent->bus)
-                        parent = parent->parent;
-                if (parent && parent->bus) {
-                        const char *path;
-
-                        path = kobject_get_path(&parent->kobj, GFP_KERNEL);
-                        if (path) {
-                                add_uevent_var(env, "PHYSDEVPATH=%s", path);
-                                kfree(path);
-                        }
-
-                        add_uevent_var(env, "PHYSDEVBUS=%s", parent->bus->name);
-
-                        if (parent->driver)
-                                add_uevent_var(env, "PHYSDEVDRIVER=%s",
-                                               parent->driver->name);
-                }
-        } else if (dev->bus) {
-                add_uevent_var(env, "PHYSDEVBUS=%s", dev->bus->name);
-
-                if (dev->driver)
-                        add_uevent_var(env, "PHYSDEVDRIVER=%s",
-                                       dev->driver->name);
-        }
-#endif
-
         /* have the bus specific function add its stuff */
         if (dev->bus && dev->bus->uevent) {
                 retval = dev->bus->uevent(dev, env);
@@ -578,24 +547,6 @@ void device_initialize(struct device *dev)
         set_dev_node(dev, -1);
 }
 
-#ifdef CONFIG_SYSFS_DEPRECATED
-static struct kobject *get_device_parent(struct device *dev,
-                                         struct device *parent)
-{
-        /* class devices without a parent live in /sys/class/<classname>/ */
-        if (dev->class && (!parent || parent->class != dev->class))
-                return &dev->class->p->class_subsys.kobj;
-        /* all other devices keep their parent */
-        else if (parent)
-                return &parent->kobj;
-
-        return NULL;
-}
-
-static inline void cleanup_device_parent(struct device *dev) {}
-static inline void cleanup_glue_dir(struct device *dev,
-                                    struct kobject *glue_dir) {}
-#else
 static struct kobject *virtual_device_parent(struct device *dev)
 {
         static struct kobject *virtual_dir = NULL;
@@ -666,6 +617,14 @@ static struct kobject *get_device_parent(struct device *dev,
                 struct kobject *parent_kobj;
                 struct kobject *k;
 
+#ifdef CONFIG_SYSFS_DEPRECATED
+                /* block disks show up in /sys/block */
+                if (dev->class == &block_class) {
+                        if (parent && parent->class == &block_class)
+                                return &parent->kobj;
+                        return &block_class.p->class_subsys.kobj;
+                }
+#endif
                 /*
                  * If we have no parent, we live in "virtual".
                  * Class-devices with a non class-device as parent, live
@@ -719,7 +678,6 @@ static void cleanup_device_parent(struct device *dev)
 {
         cleanup_glue_dir(dev, dev->kobj.parent);
 }
-#endif
 
 static void setup_parent(struct device *dev, struct device *parent)
 {
@@ -742,70 +700,29 @@ static int device_add_class_symlinks(struct device *dev)
         if (error)
                 goto out;
 
-#ifdef CONFIG_SYSFS_DEPRECATED
-        /* stacked class devices need a symlink in the class directory */
-        if (dev->kobj.parent != &dev->class->p->class_subsys.kobj &&
-            device_is_not_partition(dev)) {
-                error = sysfs_create_link(&dev->class->p->class_subsys.kobj,
-                                          &dev->kobj, dev_name(dev));
-                if (error)
-                        goto out_subsys;
-        }
-
         if (dev->parent && device_is_not_partition(dev)) {
-                struct device *parent = dev->parent;
-                char *class_name;
-
-                /*
-                 * stacked class devices have the 'device' link
-                 * pointing to the bus device instead of the parent
-                 */
-                while (parent->class && !parent->bus && parent->parent)
-                        parent = parent->parent;
-
-                error = sysfs_create_link(&dev->kobj,
-                                          &parent->kobj,
+                error = sysfs_create_link(&dev->kobj, &dev->parent->kobj,
                                           "device");
                 if (error)
-                        goto out_busid;
-
-                class_name = make_class_name(dev->class->name,
-                                                &dev->kobj);
-                if (class_name)
-                        error = sysfs_create_link(&dev->parent->kobj,
-                                                &dev->kobj, class_name);
-                kfree(class_name);
-                if (error)
-                        goto out_device;
+                        goto out_subsys;
         }
-        return 0;
 
-out_device:
-        if (dev->parent && device_is_not_partition(dev))
-                sysfs_remove_link(&dev->kobj, "device");
-out_busid:
-        if (dev->kobj.parent != &dev->class->p->class_subsys.kobj &&
-            device_is_not_partition(dev))
-                sysfs_delete_link(&dev->class->p->class_subsys.kobj, &dev->kobj,
-                                  dev_name(dev));
-#else
+#ifdef CONFIG_SYSFS_DEPRECATED
+        /* /sys/block has directories and does not need symlinks */
+        if (dev->class == &block_class)
+                return 0;
+#endif
+
         /* link in the class directory pointing to the device */
         error = sysfs_create_link(&dev->class->p->class_subsys.kobj,
                                   &dev->kobj, dev_name(dev));
         if (error)
-                goto out_subsys;
+                goto out_device;
 
-        if (dev->parent && device_is_not_partition(dev)) {
-                error = sysfs_create_link(&dev->kobj, &dev->parent->kobj,
-                                          "device");
-                if (error)
-                        goto out_busid;
-        }
         return 0;
 
-out_busid:
-        sysfs_delete_link(&dev->class->p->class_subsys.kobj, &dev->kobj, dev_name(dev));
-#endif
+out_device:
+        sysfs_remove_link(&dev->kobj, "device");
 
 out_subsys:
         sysfs_remove_link(&dev->kobj, "subsystem");
@@ -818,30 +735,14 @@ static void device_remove_class_symlinks(struct device *dev)
         if (!dev->class)
                 return;
 
-#ifdef CONFIG_SYSFS_DEPRECATED
-        if (dev->parent && device_is_not_partition(dev)) {
-                char *class_name;
-
-                class_name = make_class_name(dev->class->name, &dev->kobj);
-                if (class_name) {
-                        sysfs_remove_link(&dev->parent->kobj, class_name);
-                        kfree(class_name);
-                }
-                sysfs_remove_link(&dev->kobj, "device");
-        }
-
-        if (dev->kobj.parent != &dev->class->p->class_subsys.kobj &&
-            device_is_not_partition(dev))
-                sysfs_delete_link(&dev->class->p->class_subsys.kobj, &dev->kobj,
-                                  dev_name(dev));
-#else
         if (dev->parent && device_is_not_partition(dev))
                 sysfs_remove_link(&dev->kobj, "device");
-
-        sysfs_delete_link(&dev->class->p->class_subsys.kobj, &dev->kobj, dev_name(dev));
-#endif
-
         sysfs_remove_link(&dev->kobj, "subsystem");
+#ifdef CONFIG_SYSFS_DEPRECATED
+        if (dev->class == &block_class)
+                return;
+#endif
+        sysfs_delete_link(&dev->class->p->class_subsys.kobj, &dev->kobj, dev_name(dev));
 }
 
 /**
@@ -1613,41 +1514,23 @@ int device_rename(struct device *dev, const char *new_name)
         pr_debug("device: '%s': %s: renaming to '%s'\n", dev_name(dev),
                  __func__, new_name);
 
-#ifdef CONFIG_SYSFS_DEPRECATED
-        if ((dev->class) && (dev->parent))
-                old_class_name = make_class_name(dev->class->name, &dev->kobj);
-#endif
-
         old_device_name = kstrdup(dev_name(dev), GFP_KERNEL);
         if (!old_device_name) {
                 error = -ENOMEM;
                 goto out;
         }
 
-#ifndef CONFIG_SYSFS_DEPRECATED
         if (dev->class) {
                 error = sysfs_rename_link(&dev->class->p->class_subsys.kobj,
                         &dev->kobj, old_device_name, new_name);
                 if (error)
                         goto out;
         }
-#endif
+
         error = kobject_rename(&dev->kobj, new_name);
         if (error)
                 goto out;
 
-#ifdef CONFIG_SYSFS_DEPRECATED
-        if (old_class_name) {
-                new_class_name = make_class_name(dev->class->name, &dev->kobj);
-                if (new_class_name) {
-                        error = sysfs_rename_link(&dev->parent->kobj,
-                                                  &dev->kobj,
-                                                  old_class_name,
-                                                  new_class_name);
-                }
-        }
-#endif
-
 out:
         put_device(dev);
 
@@ -1664,40 +1547,13 @@ static int device_move_class_links(struct device *dev,
                                    struct device *new_parent)
 {
         int error = 0;
-#ifdef CONFIG_SYSFS_DEPRECATED
-        char *class_name;
 
-        class_name = make_class_name(dev->class->name, &dev->kobj);
-        if (!class_name) {
-                error = -ENOMEM;
-                goto out;
-        }
-        if (old_parent) {
-                sysfs_remove_link(&dev->kobj, "device");
-                sysfs_remove_link(&old_parent->kobj, class_name);
-        }
-        if (new_parent) {
-                error = sysfs_create_link(&dev->kobj, &new_parent->kobj,
-                                          "device");
-                if (error)
-                        goto out;
-                error = sysfs_create_link(&new_parent->kobj, &dev->kobj,
-                                          class_name);
-                if (error)
-                        sysfs_remove_link(&dev->kobj, "device");
-        } else
-                error = 0;
-out:
-        kfree(class_name);
-        return error;
-#else
         if (old_parent)
                 sysfs_remove_link(&dev->kobj, "device");
         if (new_parent)
                 error = sysfs_create_link(&dev->kobj, &new_parent->kobj,
                                           "device");
         return error;
-#endif
 }
 
 /**
diff --git a/drivers/scsi/hosts.c b/drivers/scsi/hosts.c
index 8a8f803439e1..ba7f87acc00d 100644
--- a/drivers/scsi/hosts.c
+++ b/drivers/scsi/hosts.c
@@ -411,9 +411,7 @@ struct Scsi_Host *scsi_host_alloc(struct scsi_host_template *sht, int privsize)
 
         device_initialize(&shost->shost_gendev);
         dev_set_name(&shost->shost_gendev, "host%d", shost->host_no);
-#ifndef CONFIG_SYSFS_DEPRECATED
         shost->shost_gendev.bus = &scsi_bus_type;
-#endif
         shost->shost_gendev.type = &scsi_host_type;
 
         device_initialize(&shost->shost_dev);
diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c
index 3d0a1e6e9c48..087821fac8fe 100644
--- a/drivers/scsi/scsi_scan.c
+++ b/drivers/scsi/scsi_scan.c
@@ -417,9 +417,7 @@ static struct scsi_target *scsi_alloc_target(struct device *parent,
         starget->reap_ref = 1;
         dev->parent = get_device(parent);
         dev_set_name(dev, "target%d:%d:%d", shost->host_no, channel, id);
-#ifndef CONFIG_SYSFS_DEPRECATED
         dev->bus = &scsi_bus_type;
-#endif
         dev->type = &scsi_target_type;
         starget->id = id;
         starget->channel = channel;
diff --git a/include/sound/core.h b/include/sound/core.h
index 89e0ac17f44a..df26ebbfa9c6 100644
--- a/include/sound/core.h
+++ b/include/sound/core.h
@@ -133,9 +133,7 @@ struct snd_card {
         int free_on_last_close;         /* free in context of file_release */
         wait_queue_head_t shutdown_sleep;
         struct device *dev;             /* device assigned to this card */
-#ifndef CONFIG_SYSFS_DEPRECATED
         struct device *card_dev;        /* cardX object for sysfs */
-#endif
 
 #ifdef CONFIG_PM
         unsigned int power_state;       /* power state */
@@ -196,11 +194,7 @@ struct snd_minor {
 /* return a device pointer linked to each sound device as a parent */
 static inline struct device *snd_card_get_device_link(struct snd_card *card)
 {
-#ifdef CONFIG_SYSFS_DEPRECATED
-        return card ? card->dev : NULL;
-#else
         return card ? card->card_dev : NULL;
-#endif
 }
 
 /* sound.c */
diff --git a/init/Kconfig b/init/Kconfig
index 2de5b1cbadd9..137609f33ebc 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -656,40 +656,24 @@ config MM_OWNER
         bool
 
 config SYSFS_DEPRECATED
-        bool
-
-config SYSFS_DEPRECATED_V2
         bool "enable deprecated sysfs features to support old userspace tools"
         depends on SYSFS
         default n
-        select SYSFS_DEPRECATED
-        help
-          This option switches the layout of sysfs to the deprecated
-          version. Do not use it on recent distributions.
-
-          The current sysfs layout features a unified device tree at
-          /sys/devices/, which is able to express a hierarchy between
-          class devices. If the deprecated option is set to Y, the
-          unified device tree is split into a bus device tree at
-          /sys/devices/ and several individual class device trees at
-          /sys/class/. The class and bus devices will be connected by
-          "<subsystem>:<name>" and the "device" links. The "block"
-          class devices, will not show up in /sys/class/block/. Some
-          subsystems will suppress the creation of some devices which
-          depend on the unified device tree.
-
-          This option is not a pure compatibility option that can
-          be safely enabled on newer distributions. It will change the
-          layout of sysfs to the non-extensible deprecated version,
-          and disable some features, which can not be exported without
-          confusing older userspace tools. Since 2007/2008 all major
-          distributions do not enable this option, and ship no tools which
-          depend on the deprecated layout or this option.
-
-          If you are using a new kernel on an older distribution, or use
-          older userspace tools, you might need to say Y here. Do not say Y,
-          if the original kernel, that came with your distribution, has
-          this option set to N.
+        help
+          This option switches the layout of the "block" class devices, to not
+          show up in /sys/class/block/, but only in /sys/block/.
+
+          This option allows new kernels to run on old distributions and tools,
+          which might get confused by /sys/class/block/. Since 2007/2008 all
+          major distributions and tools handle this just fine.
+
+          Recent distributions and userspace tools after 2009/2010 depend on
+          the existence of /sys/class/block/, and will not work with this
+          option enabled.
+
+          Only if you are using a new kernel on an old distribution, you might
+          need to say Y here. Never say Y, if the original kernel, that came
+          with your distribution, has not set this option.
 
 config RELAY
         bool "Kernel->user space relay support (formerly relayfs)"
diff --git a/sound/core/init.c b/sound/core/init.c
index ec4a50ce5656..f7c3df8b521b 100644
--- a/sound/core/init.c
+++ b/sound/core/init.c
@@ -395,12 +395,10 @@ int snd_card_disconnect(struct snd_card *card)
                 snd_printk(KERN_ERR "not all devices for card %i can be disconnected\n", card->number);
 
         snd_info_card_disconnect(card);
-#ifndef CONFIG_SYSFS_DEPRECATED
         if (card->card_dev) {
                 device_unregister(card->card_dev);
                 card->card_dev = NULL;
         }
-#endif
 #ifdef CONFIG_PM
         wake_up(&card->power_sleep);
 #endif
@@ -573,7 +571,6 @@ void snd_card_set_id(struct snd_card *card, const char *nid)
 }
 EXPORT_SYMBOL(snd_card_set_id);
 
-#ifndef CONFIG_SYSFS_DEPRECATED
 static ssize_t
 card_id_show_attr(struct device *dev,
                   struct device_attribute *attr, char *buf)
@@ -630,7 +627,6 @@ card_number_show_attr(struct device *dev,
 
 static struct device_attribute card_number_attrs =
         __ATTR(number, S_IRUGO, card_number_show_attr, NULL);
-#endif /* CONFIG_SYSFS_DEPRECATED */
 
 /**
  *  snd_card_register - register the soundcard
@@ -649,7 +645,7 @@ int snd_card_register(struct snd_card *card)
 
         if (snd_BUG_ON(!card))
                 return -EINVAL;
-#ifndef CONFIG_SYSFS_DEPRECATED
+
         if (!card->card_dev) {
                 card->card_dev = device_create(sound_class, card->dev,
                                                MKDEV(0, 0), card,
@@ -657,7 +653,7 @@ int snd_card_register(struct snd_card *card)
                 if (IS_ERR(card->card_dev))
                         card->card_dev = NULL;
         }
-#endif
+
         if ((err = snd_device_register_all(card)) < 0)
                 return err;
         mutex_lock(&snd_card_mutex);
@@ -674,7 +670,6 @@ int snd_card_register(struct snd_card *card)
         if (snd_mixer_oss_notify_callback)
                 snd_mixer_oss_notify_callback(card, SND_MIXER_OSS_NOTIFY_REGISTER);
 #endif
-#ifndef CONFIG_SYSFS_DEPRECATED
         if (card->card_dev) {
                 err = device_create_file(card->card_dev, &card_id_attrs);
                 if (err < 0)
@@ -683,7 +678,7 @@ int snd_card_register(struct snd_card *card)
                 if (err < 0)
                         return err;
         }
-#endif
+
         return 0;
 }