[PATCH 0/4] add error handle for bdi debugfs register

[weiping zhang <zhangweiping@xxxxxxxxxxxxxxx>]

this series add error handle for bdi debugfs register flow, the first
three patches try to convert void function to int and do some cleanup
if create dir or file fail.

the fourth patch only add a WARN_ON in device_add_disk, no function change.

weiping zhang (4):
  bdi: add check for bdi_debug_root
  bdi: convert bdi_debug_register to int
  bdi: add error handle for bdi_debug_register
  block: add WARN_ON if bdi register fail

 block/genhd.c    |  4 +++-
 mm/backing-dev.c | 41 +++++++++++++++++++++++++++++++++++------
 2 files changed, 38 insertions(+), 7 deletions(-)

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2.14.2