[patch 00/24] lib/kobject: kset_create_and_add return error clean up

[Jeff Liu <jeff.liu@oracle.com>]

Hello,

Currently, to verify if kset_create_and_add() is succeed or not, almost
all subsystems with sysfs support are check up the return value against
NULL, then return -ENOMEM on failure, since kset_create_and_add() always 
return NULL in case of anything wrong.  However, kset_register() can fail
due to other reasons, hence it's better to return the actual error on
kset_create_and_add(), this patch series is just did that and this is
inspired by Christoph in another thread:
http://www.spinics.net/lists/linux-mm/msg74729.html


Jeff Liu (24)
  kobject: return actual error on kset_create_and_add
  sample/kobject: update kset-example code
  slub: return actual error on sysfs_slab_add
  powerpc: check/return acutal error on sysfs init
  s390: check/return actual error on sysfs init
  crypt: return actual error code on pcrypt_init
  kernel: return actual error on param_sysfs_init
  drivers/firmware: return actual error on sysfs init
  drivers/iommu: check actual error on iommu_init
  drivers/base: return actual error on sysfs init
  drviers/scsi: check sysfs init return value via IS_ERR at iscsi_boot_create_kset
  drivers/parisc: return actual error on pdc_stable_init
  drivers/pci: return actual error on pci_slot_init
  drivers/s390: return actual error on sysfs init functions
  drivers/of: return actual error on of_init
  btrfs: return actual error on btrfs_init_sysfs
  gfs2: return actual error on gfs2_sys_init
  exofs: return actual error on exofs_sysfs_odev_add
  fs/dlm: return actual error on dlm_lockspace_init
  ext4: return actual error on ext4_init_fs
  f2fs: return actual error on init_f2fs_fs
  ocfs2: return actual error on sysfs init
  net: return actual error on register_queue_kobjects
  security/smack: return acutal error on smk_init_sysfs


Cheers,
-Jeff