[GIT PULL REQUEST] md updates for 4.2-rc

[NeilBrown <neilb@suse.com>]

One of these patches is for a CVE:  CVE-2015-5697

I'm not convinced it is serious (data leak from CAP_SYS_ADMIN ioctl)
but as people seem to want to back-port it, I've included a minimal
version here.  The remainder of that patch from Benjamin is
code-cleanup and will arrive in the 4.3 merge window.

NeilBrown

The following changes since commit 74d33293e467df61de1b1d8b2fbe29e550dec33b:

  Linux 4.2-rc5 (2015-08-02 18:34:55 -0700)

are available in the git repository at:

  git://neil.brown.name/md/ tags/md/4.2-rc5-fixes

for you to fetch changes up to 49895bcc7e566ba455eb2996607d6fbd3447ce16:

  md/raid5: don't let shrink_slab shrink too far. (2015-08-03 17:10:56
  +1000)

----------------------------------------------------------------
Three more fixes for md in 4.2

Mostly corner-case stuff.

----------------------------------------------------------------
Benjamin Randazzo (1):
      md: use kzalloc() when bitmap is disabled

NeilBrown (2):
      md/raid1: extend spinlock to protect raid1_end_read_request
                against inconsistencies
      md/raid5: don't let shrink_slab shrink too far.

 drivers/md/md.c    |  2 +-
 drivers/md/raid1.c | 10 ++++++----
 drivers/md/raid5.c |  5 +++--
 3 files changed, 10 insertions(+), 7 deletions(-)