[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>
diff --git a/fs/partitions/check.c b/fs/partitions/check.c
index 7ef1f09..8851b81 100644
--- a/fs/partitions/check.c
+++ b/fs/partitions/check.c
@@ -329,6 +329,7 @@
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 @@
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 @@
kfree(disk_name);
}
}
+ sysfs_create_link(&disk->kobj, &block_subsys.kset.kobj, "subsystem");
}
/* Not exported, helper to add_disk(). */
@@ -548,5 +551,6 @@
put_device(disk->driverfs_dev);
disk->driverfs_dev = NULL;
}
+ sysfs_remove_link(&disk->kobj, "subsystem");
kobject_del(&disk->kobj);
}