[PATCH] Driver core: add generic "subsystem" link to all devices

Like the SUBSYTEM= key we find in the environment of the uevent, this
creates a generic "subsystem" link in sysfs for every device. Userspace
usually doesn't care at all if its a "class" or a "bus" device. This
provides an unified way to determine the subsytem of a device, regardless
of the way the driver core has created it.

Signed-off-by: Kay Sievers <kay.sievers@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 4 insertions, 0 deletions

diff --git a/fs/partitions/check.c b/fs/partitions/check.c
index 7ef1f094de91..8851b81e7c5a 100644
--- a/fs/partitions/check.c
+++ b/fs/partitions/check.c
@@ -329,6 +329,7 @@ void delete_partition(struct gendisk *disk, int part)
         p->ios[0] = p->ios[1] = 0;
         p->sectors[0] = p->sectors[1] = 0;
         devfs_remove("%s/part%d", disk->devfs_name, part);
+        sysfs_remove_link(&p->kobj, "subsystem");
         if (p->holder_dir)
                 kobject_unregister(p->holder_dir);
         kobject_uevent(&p->kobj, KOBJ_REMOVE);
@@ -363,6 +364,7 @@ void add_partition(struct gendisk *disk, int part, sector_t start, sector_t len)
         kobject_add(&p->kobj);
         if (!disk->part_uevent_suppress)
                 kobject_uevent(&p->kobj, KOBJ_ADD);
+        sysfs_create_link(&p->kobj, &block_subsys.kset.kobj, "subsystem");
         partition_sysfs_add_subdir(p);
         disk->part[part-1] = p;
 }
@@ -398,6 +400,7 @@ static void disk_sysfs_symlinks(struct gendisk *disk)
                         kfree(disk_name);
                 }
         }
+        sysfs_create_link(&disk->kobj, &block_subsys.kset.kobj, "subsystem");
 }
 
 /* Not exported, helper to add_disk(). */
@@ -548,5 +551,6 @@ void del_gendisk(struct gendisk *disk)
                 put_device(disk->driverfs_dev);
                 disk->driverfs_dev = NULL;
         }
+        sysfs_remove_link(&disk->kobj, "subsystem");
         kobject_del(&disk->kobj);
 }