[GIT PULL] Final block fixes for 3.19

[Jens Axboe]

Hi Linus,

Unfortunately the hctx/ctx lifetime fix from last pull had some issues.
This pull request contains a revert of the problematic commit, and a
proper rewrite of it. The rewrite has been tested by the users
complaining about the regression, and it works fine now. Additionally,
I've run testing on all the blk-mq use cases for it and it passes. So we
should definitely get this into 3.19, to avoid regression for some
cases.

Please pull!

  git://git.kernel.dk/linux-block.git for-linus

for you to fetch changes up to e09aae7edec1d20824c60a6f0ca4589f99ada17b:

  blk-mq: release mq's kobjects in blk_release_queue() (2015-01-29 08:30:51 -0800)

----------------------------------------------------------------
Ming Lei (2):
      Revert "blk-mq: fix hctx/ctx kobject use-after-free"
      blk-mq: release mq's kobjects in blk_release_queue()

 block/blk-mq-sysfs.c | 25 ++-----------------------
 block/blk-mq.c       | 23 +++++++++++++++++++++--
 block/blk-mq.h       |  2 ++
 block/blk-sysfs.c    |  2 ++
 4 files changed, 27 insertions(+), 25 deletions(-)

-- 
Jens Axboe

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