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

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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 <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Kay Sievers 2006-06-15 15:31:56 +02:00 • committed by Greg Kroah-Hartman
commit b9d9c82b4d
5 changed files with 17 additions and 7 deletions
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4
fs/partitions/check.c
View file

@ -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);
}