[GIT PULL] Make the block layer great again

[Jens Axboe <axboe@fb.com>]

Hi Linus,

Basically three amazing fixes in this pull request, split into 4
patches. Believe me, they should go into 4.4. Two of them fix a
regression, the third and last fixes an easy-to-trigger bug.

- Fix a bad irq enable through null_blk, for queue_mode=1 and using
  timer completions. Add a block helper to restart a queue
  asynchronously, and use that from null_blk. From me.

- Fix a performance issue in NVMe. Some devices (Intel Pxxxx) expose a
  stripe boundary, and performance suffers if we cross it. We took that
  into account for merging, but not for the newer splitting code. Fix
  from Keith.

- Fix a kernel oops in lightnvm with multiple channels. From Matias.

Please pull!


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


----------------------------------------------------------------
Jens Axboe (2):
      block: add blk_start_queue_async()
      null_blk: use async queue restart helper

Keith Busch (1):
      block: Split bios on chunk boundaries

Matias Bjørling (1):
      lightnvm: wrong offset in bad blk lun calculation

 block/blk-core.c          | 16 ++++++++++++++++
 block/blk-merge.c         |  2 +-
 drivers/block/null_blk.c  | 11 +++++------
 drivers/lightnvm/gennvm.c |  2 +-
 include/linux/blkdev.h    |  1 +
 5 files changed, 24 insertions(+), 8 deletions(-)

-- 
Jens Axboe