1. 30 Dec, 2015 2 commits
    • Vladimir Davydov's avatar
      mm: memcontrol: fix possible memcg leak due to interrupted reclaim · 6df38689
      Vladimir Davydov authored
      Memory cgroup reclaim can be interrupted with mem_cgroup_iter_break()
      once enough pages have been reclaimed, in which case, in contrast to a
      full round-trip over a cgroup sub-tree, the current position stored in
      mem_cgroup_reclaim_iter of the target cgroup does not get invalidated
      and so is left holding the reference to the last scanned cgroup.  If the
      target cgroup does not get scanned again (we might have just reclaimed
      the last page or all processes might exit and free their memory
      voluntary), we will leak it, because there is nobody to put the
      reference held by the iterator.
      
      The problem is easy to reproduce by running the following command
      sequence in a loop:
      
          mkdir /sys/fs/cgroup/memory/test
          echo 100M > /sys/fs/cgroup/memory/test/memory.limit_in_bytes
          echo $$ > /sys/fs/cgroup/memory/test/cgroup.procs
          memhog 150M
          echo $$ > /sys/fs/cgroup/memory/cgroup.procs
          rmdir test
      
      The cgroups generated by it will never get freed.
      
      This patch fixes this issue by making mem_cgroup_iter avoid taking
      reference to the current position.  In order not to hit use-after-free
      bug while running reclaim in parallel with cgroup deletion, we make use
      of ->css_released cgroup callback to clear references to the dying
      cgroup in all reclaim iterators that might refer to it.  This callback
      is called right before scheduling rcu work which will free css, so if we
      access iter->position from rcu read section, we might be sure it won't
      go away under us.
      
      [hannes@cmpxchg.org: clean up css ref handling]
      Fixes: 5ac8fb31
      
       ("mm: memcontrol: convert reclaim iterator to simple css refcounting")
      Signed-off-by: default avatarVladimir Davydov <vdavydov@virtuozzo.com>
      Signed-off-by: default avatarJohannes Weiner <hannes@cmpxchg.org>
      Acked-by: default avatarMichal Hocko <mhocko@kernel.org>
      Acked-by: default avatarJohannes Weiner <hannes@cmpxchg.org>
      Cc: <stable@vger.kernel.org>	[3.19+]
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      6df38689
    • Joseph Qi's avatar
      ocfs2: fix BUG when calculate new backup super · 5c9ee4cb
      Joseph Qi authored
      
      
      When resizing, it firstly extends the last gd.  Once it should backup
      super in the gd, it calculates new backup super and update the
      corresponding value.
      
      But it currently doesn't consider the situation that the backup super is
      already done.  And in this case, it still sets the bit in gd bitmap and
      then decrease from bg_free_bits_count, which leads to a corrupted gd and
      trigger the BUG in ocfs2_block_group_set_bits:
      
          BUG_ON(le16_to_cpu(bg->bg_free_bits_count) < num_bits);
      
      So check whether the backup super is done and then do the updates.
      Signed-off-by: default avatarJoseph Qi <joseph.qi@huawei.com>
      Reviewed-by: default avatarJiufei Xue <xuejiufei@huawei.com>
      Reviewed-by: default avatarYiwen Jiang <jiangyiwen@huawei.com>
      Cc: Mark Fasheh <mfasheh@suse.de>
      Cc: Joel Becker <jlbec@evilplan.org>
      Cc: <stable@vger.kernel.org>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      5c9ee4cb
  2. 28 Dec, 2015 5 commits
  3. 27 Dec, 2015 5 commits
    • Al Viro's avatar
      MIPS: Fix bitrot in __get_user_unaligned() · 930c0f70
      Al Viro authored
      
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
      930c0f70
    • Linus Torvalds's avatar
      Merge tag 'pm+acpi-4.4-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm · 2c96961f
      Linus Torvalds authored
      Pull power management and ACPI fixes from Rafael Wysocki:
       "These fix an ACPI processor driver regression introduced during the
        4.3 cycle and a mistake in the recently added SCPI support in the
        arm_big_little cpufreq driver.
      
        Specifics:
      
         - Fix a thermal management issue introduced by an ACPI processor
           driver change made during the 4.3 development cycle that failed to
           return 0 from a function on success which triggered an error
           cleanup path every time it had been called that deleted useful data
           structures created previously (Srinivas Pandruvada).
      
         - Fix a variable data type issue in the arm_big_little cpufreq
           driver's SCPI support code added recently that prevents error
           handling in there from working correctly (Dan Carpenter)"
      
      * tag 'pm+acpi-4.4-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
        cpufreq: scpi-cpufreq: signedness bug in scpi_get_dvfs_info()
        ACPI / processor: Fix thermal cooling device regression
      2c96961f
    • Linus Torvalds's avatar
      Merge tag 'md/4.4-rc6-fix' of git://neil.brown.name/md · f0cf008f
      Linus Torvalds authored
      Pull md bugfix from Neil Brown:
       "One more md fix for 4.4-rc
      
        Fix a regression which causes reshape to not start properly sometimes"
      
      * tag 'md/4.4-rc6-fix' of git://neil.brown.name/md:
        md: remove check for MD_RECOVERY_NEEDED in action_store.
      f0cf008f
    • Linus Torvalds's avatar
      Merge tag 'upstream-4.4-rc7' of git://git.infradead.org/linux-ubifs · 3bef22ee
      Linus Torvalds authored
      Pull UBI bug fixes from Richard Weinberger:
       "This contains four bug fixes for UBI"
      
      * tag 'upstream-4.4-rc7' of git://git.infradead.org/linux-ubifs:
        mtd: ubi: don't leak e if schedule_erase() fails
        mtd: ubi: fixup error correction in do_sync_erase()
        UBI: fix use of "VID" vs. "EC" in header self-check
        UBI: fix return error code
      3bef22ee
    • Linus Torvalds's avatar
      Merge tag 'trace-v4.4-rc4-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace · e2b0a161
      Linus Torvalds authored
      Pull ftrace/recordmcount fix from Steven Rostedt:
       "Russell King was reporting lots of warnings when he compiled his
        kernel with ftrace enabled.  With some investigation it was discovered
        that it was his compile setup.  He was using ccache with hard links,
        which allowed recordmcount to process the same .o twice.  When this
        happens, recordmcount will detect that it was already done and give a
        warning about it.
      
        Russell fixed this by having recordmcount detect that the object file
        has more than one hard link, and if it does, it unlinks the object
        file after it maps it and processes then.  This appears to fix the
        issue.
      
        As you did not like the fact that recordmcount modified the file in
        place and thought that it should do the modifications in memory and
        then write it out to disk and move it over the old file to prevent
        other more subtle issues like the one above, a second patch is added
        on top of Russell's to do just that.  Luckily the original code had
        write and lseek wrappers that I was able to modify to not do inplace
        writes, but simply keep track of the changes made in memory.  When a
        write is made, a "update" flag is set, and at the end of processing,
        if the update is set, then it writes the file with changes out to a
        new file, and then renames it over the original one.
      
        The file descriptor is still passed to the write and lseek wrappers
        because removing that would cause the change to be more intrusive.
        That can be removed in a follow up cleanup patch that can wait till
        the next merge window"
      
      * tag 'trace-v4.4-rc4-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace:
        ftrace/scripts: Have recordmcount copy the object file
        scripts: recordmcount: break hardlinks
      e2b0a161
  4. 26 Dec, 2015 2 commits
    • Linus Torvalds's avatar
      Merge tag 'arc-4.4-rc7-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc · 12261f4e
      Linus Torvalds authored
      Pull ARC fixes from Vineet Gupta:
       "Sorry for this late pull request, but these are all important fixes
        for code introduced/updated in this release which we will otherwise
        end up back porting.
      
         - Unwinder rework (A revert followed by better fix)
         - Build errors: MMUv2, modules with -Os
         - highmem section mismatch build splat"
      
      * tag 'arc-4.4-rc7-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc:
        ARC: dw2 unwind: Catch Dwarf SNAFUs early
        ARC: dw2 unwind: Don't bail for CIE.version != 1
        Revert "ARC: dw2 unwind: Ignore CIE version !=1 gracefully instead of bailing"
        ARC: Fix linking errors with CONFIG_MODULE + CONFIG_CC_OPTIMIZE_FOR_SIZE
        ARC: mm: fix building for MMU v2
        ARC: mm: HIGHMEM: Fix section mismatch splat
      12261f4e
    • Rafael J. Wysocki's avatar
      Merge branches 'acpi-processor' and 'pm-cpufreq' · 43b28ca8
      Rafael J. Wysocki authored
      * acpi-processor:
        ACPI / processor: Fix thermal cooling device regression
      
      * pm-cpufreq:
        cpufreq: scpi-cpufreq: signedness bug in scpi_get_dvfs_info()
      43b28ca8
  5. 25 Dec, 2015 2 commits
    • Linus Torvalds's avatar
      Merge branch 'parisc-4.4-4' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux · 8db7b3c5
      Linus Torvalds authored
      Pull parisc system call restart fix from Helge Deller:
       "The architectural design of parisc always uses two instructions to
        call kernel syscalls (delayed branch feature).  This means that the
        instruction following the branch (located in the delay slot of the
        branch instruction) is executed before control passes to the branch
        destination.
      
        Depending on which assembler instruction and how it is used in
        usersapce in the delay slot, this sometimes made restarted syscalls
        like futex() and poll() failing with -ENOSYS"
      
      * 'parisc-4.4-4' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux:
        parisc: Fix syscall restarts
      8db7b3c5
    • Linus Torvalds's avatar
      Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc · 682cb0cd
      Linus Torvalds authored
      Pull sparc fixes from David Miller:
      
       1) Finally make perf stack backtraces stable on sparc, several problems
          (mostly due to the context in which the user copies from the stack
          are done) contributed to this.
      
          From Rob Gardner.
      
       2) Export ADI capability if the cpu supports it.
      
       3) Hook up userfaultfd system call.
      
       4) When faults happen during user copies we really have to clean up and
          restore the FPU state fully.  Also from Rob Gardner
      
      * git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc:
        tty/serial: Skip 'NULL' char after console break when sysrq enabled
        sparc64: fix FP corruption in user copy functions
        sparc64: Perf should save/restore fault info
        sparc64: Ensure perf can access user stacks
        sparc64: Don't set %pil in rtrap_nmi too early
        sparc64: Add ADI capability to cpu capabilities
        tty: serial: constify sunhv_ops structs
        sparc: Hook up userfaultfd system call
      682cb0cd
  6. 24 Dec, 2015 8 commits
    • Vijay Kumar's avatar
      tty/serial: Skip 'NULL' char after console break when sysrq enabled · 079317a6
      Vijay Kumar authored
      
      
      When sysrq is triggered from console, serial driver for SUN hypervisor
      console receives a console break and enables the sysrq. It expects a valid
      sysrq char following with break. Meanwhile if driver receives 'NULL'
      ASCII char then it disables sysrq and sysrq handler will never be invoked.
      
      This fix skips calling uart sysrq handler when 'NULL' is received while
      sysrq is enabled.
      Signed-off-by: default avatarVijay Kumar <vijay.ac.kumar@oracle.com>
      Acked-by: default avatarKarl Volz <karl.volz@oracle.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      079317a6
    • Rob Gardner's avatar
      sparc64: fix FP corruption in user copy functions · a7c5724b
      Rob Gardner authored
      
      
      Short story: Exception handlers used by some copy_to_user() and
      copy_from_user() functions do not diligently clean up floating point
      register usage, and this can result in a user process seeing invalid
      values in floating point registers. This sometimes makes the process
      fail.
      
      Long story: Several cpu-specific (NG4, NG2, U1, U3) memcpy functions
      use floating point registers and VIS alignaddr/faligndata to
      accelerate data copying when source and dest addresses don't align
      well. Linux uses a lazy scheme for saving floating point registers; It
      is not done upon entering the kernel since it's a very expensive
      operation. Rather, it is done only when needed. If the kernel ends up
      not using FP regs during the course of some trap or system call, then
      it can return to user space without saving or restoring them.
      
      The various memcpy functions begin their FP code with VISEntry (or a
      variation thereof), which saves the FP regs. They conclude their FP
      code with VISExit (or a variation) which essentially marks the FP regs
      "clean", ie, they contain no unsaved values. fprs.FPRS_FEF is turned
      off so that a lazy restore will be triggered when/if the user process
      accesses floating point regs again.
      
      The bug is that the user copy variants of memcpy, copy_from_user() and
      copy_to_user(), employ an exception handling mechanism to detect faults
      when accessing user space addresses, and when this handler is invoked,
      an immediate return from the function is forced, and VISExit is not
      executed, thus leaving the fprs register in an indeterminate state,
      but often with fprs.FPRS_FEF set and one or more dirty bits. This
      results in a return to user space with invalid values in the FP regs,
      and since fprs.FPRS_FEF is on, no lazy restore occurs.
      
      This bug affects copy_to_user() and copy_from_user() for NG4, NG2,
      U3, and U1. All are fixed by using a new exception handler for those
      loads and stores that are done during the time between VISEnter and
      VISExit.
      
      n.b. In NG4memcpy, the problematic code can be triggered by a copy
      size greater than 128 bytes and an unaligned source address.  This bug
      is known to be the cause of random user process memory corruptions
      while perf is running with the callgraph option (ie, perf record -g).
      This occurs because perf uses copy_from_user() to read user stacks,
      and may fault when it follows a stack frame pointer off to an
      invalid page. Validation checks on the stack address just obscure
      the underlying problem.
      Signed-off-by: default avatarRob Gardner <rob.gardner@oracle.com>
      Signed-off-by: default avatarDave Aldridge <david.j.aldridge@oracle.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      a7c5724b
    • Rob Gardner's avatar
      sparc64: Perf should save/restore fault info · 83352694
      Rob Gardner authored
      
      
      There have been several reports of random processes being killed with
      a bus error or segfault during userspace stack walking in perf.  One
      of the root causes of this problem is an asynchronous modification to
      thread_info fault_address and fault_code, which stems from a perf
      counter interrupt arriving during kernel processing of a "benign"
      fault, such as a TSB miss. Since perf_callchain_user() invokes
      copy_from_user() to read user stacks, a fault is not only possible,
      but probable. Validity checks on the stack address merely cover up the
      problem and reduce its frequency.
      
      The solution here is to save and restore fault_address and fault_code
      in perf_callchain_user() so that the benign fault handler is not
      disturbed by a perf interrupt.
      Signed-off-by: default avatarRob Gardner <rob.gardner@oracle.com>
      Signed-off-by: default avatarDave Aldridge <david.j.aldridge@oracle.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      83352694
    • Rob Gardner's avatar
      sparc64: Ensure perf can access user stacks · 3f74306a
      Rob Gardner authored
      
      
      When an interrupt (such as a perf counter interrupt) is delivered
      while executing in user space, the trap entry code puts ASI_AIUS in
      %asi so that copy_from_user() and copy_to_user() will access the
      correct memory. But if a perf counter interrupt is delivered while the
      cpu is already executing in kernel space, then the trap entry code
      will put ASI_P in %asi, and this will prevent copy_from_user() from
      reading any useful stack data in either of the perf_callchain_user_X
      functions, and thus no user callgraph data will be collected for this
      sample period. An additional problem is that a fault is guaranteed
      to occur, and though it will be silently covered up, it wastes time
      and could perturb state.
      
      In perf_callchain_user(), we ensure that %asi contains ASI_AIUS
      because we know for a fact that the subsequent calls to
      copy_from_user() are intended to read the user's stack.
      
      [ Use get_fs()/set_fs() -DaveM ]
      Signed-off-by: default avatarRob Gardner <rob.gardner@oracle.com>
      Signed-off-by: default avatarDave Aldridge <david.j.aldridge@oracle.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      3f74306a
    • Rob Gardner's avatar
      sparc64: Don't set %pil in rtrap_nmi too early · 1ca04a4c
      Rob Gardner authored
      Commit 28a1f533
      
       delays setting %pil to avoid potential
      hardirq stack overflow in the common rtrap_irq path.
      Setting %pil also needs to be delayed in the rtrap_nmi
      path for the same reason.
      Signed-off-by: default avatarRob Gardner <rob.gardner@oracle.com>
      Signed-off-by: default avatarDave Aldridge <david.j.aldridge@oracle.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      1ca04a4c
    • Khalid Aziz's avatar
      sparc64: Add ADI capability to cpu capabilities · 82924e54
      Khalid Aziz authored
      
      
      Add ADI (Application Data Integrity) capability to cpu capabilities list.
      ADI capability allows virtual addresses to be encoded with a tag in
      bits 63-60. This tag serves as an access control key for the regions
      of virtual address with ADI enabled and a key set on them. Hypervisor
      encodes this capability as "adp" in "hwcap-list" property in machine
      description.
      Signed-off-by: default avatarKhalid Aziz <khalid.aziz@oracle.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      82924e54
    • Aya Mahfouz's avatar
      tty: serial: constify sunhv_ops structs · 01fd3c27
      Aya Mahfouz authored
      
      
      Constifies sunhv_ops structures in tty's serial
      driver since they are not modified after their
      initialization.
      
      Detected and found using Coccinelle.
      Suggested-by: default avatarJulia Lawall <Julia.Lawall@lip6.fr>
      Signed-off-by: default avatarAya Mahfouz <mahfouz.saif.elyazal@gmail.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      01fd3c27
    • Dan Carpenter's avatar
      cpufreq: scpi-cpufreq: signedness bug in scpi_get_dvfs_info() · a7def561
      Dan Carpenter authored
      The "domain" variable needs to be signed for the error handling to work.
      
      Fixes: 8def3103
      
       (cpufreq: arm_big_little: add SCPI interface driver)
      Signed-off-by: default avatarDan Carpenter <dan.carpenter@oracle.com>
      Acked-by: default avatarViresh Kumar <viresh.kumar@linaro.org>
      Acked-by: default avatarSudeep Holla <sudeep.holla@arm.com>
      Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
      a7def561
  7. 23 Dec, 2015 7 commits
    • Mike Kravetz's avatar
      sparc: Hook up userfaultfd system call · 9bcfd78a
      Mike Kravetz authored
      
      
      After hooking up system call, userfaultfd selftest was successful for
      both 32 and 64 bit version of test.
      Signed-off-by: default avatarMike Kravetz <mike.kravetz@oracle.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      9bcfd78a
    • Linus Torvalds's avatar
      Merge tag 'sound-4.4-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound · a8816434
      Linus Torvalds authored
      Pull sound fixes from Takashi Iwai:
       "This shouldn't be a nightmare before Christmas: just a handful small
        device-specific fixes for various ASoC and HD-audio drivers.  Most of
        them are stable fixes"
      
      * tag 'sound-4.4-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound:
        ALSA: hda/realtek - Fix silent headphone output on MacPro 4,1 (v2)
        ASoC: fsl_sai: fix no frame clk in master mode
        ALSA: hda - Set SKL+ hda controller power at freeze() and thaw()
        ASoC: sgtl5000: fix VAG power up timing
        ASoC: rockchip: spdif: Set transmit data level to 16 samples
        ASoC: wm8974: set cache type for regmap
        ASoC: es8328: Fix shifts for mixer switches
        ASoC: davinci-mcasp: Fix XDATA check in mcasp_start_tx
        ASoC: es8328: Fix deemphasis values
      a8816434
    • Linus Torvalds's avatar
      Merge tag 'drm-intel-fixes-2015-12-23' of git://anongit.freedesktop.org/drm-intel · 5b726e06
      Linus Torvalds authored
      Pull i915 drm fixes from Jani Nikula:
       "Here's a batch of i915 fixes all around.  It may be slightly bigger
        than one would hope for at this stage, but they've all been through
        testing in our -next before being picked up for v4.4.  Also, I missed
        Dave's fixes pull earlier today just because I wanted an extra testing
        round on this.  So I'm fairly confident.
      
        Wishing you all the things it is customary to wish this time of the
        year"
      
      * tag 'drm-intel-fixes-2015-12-23' of git://anongit.freedesktop.org/drm-intel:
        drm/i915: Correct max delay for HDMI hotplug live status checking
        drm/i915: mdelay(10) considered harmful
        drm/i915: Kill intel_crtc->cursor_bo
        drm/i915: Workaround CHV pipe C cursor fail
        drm/i915: Only spin whilst waiting on the current request
        drm/i915: Limit the busy wait on requests to 5us not 10ms!
        drm/i915: Break busywaiting for requests on pending signals
        drm/i915: Disable primary plane if we fail to reconstruct BIOS fb (v2)
        drm/i915: Set the map-and-fenceable flag for preallocated objects
        drm/i915: Drop the broken cursor base==0 special casing
      5b726e06
    • Linus Torvalds's avatar
      Merge branch 'drm-fixes' of git://people.freedesktop.org/~airlied/linux · 2bfd43d8
      Linus Torvalds authored
      Pull drm fixes from Dave Airlie:
       "Not much happening, should have dequeued this lot earlier.
      
        One amdgpu, one nouveau and one exynos fix"
      
      * 'drm-fixes' of git://people.freedesktop.org/~airlied/linux:
        drm/exynos: atomic check only enabled crtc states
        drm/nouveau/bios/fan: hardcode the fan mode to linear
        drm/amdgpu: fix user fence handling
      2bfd43d8
    • Takashi Iwai's avatar
      Merge tag 'asoc-fix-v4.4-rc6' of... · 0fb0b822
      Takashi Iwai authored
      Merge tag 'asoc-fix-v4.4-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound into for-linus
      
      ASoC: Fixes for v4.4
      
      A collection of small driver specific fixes here, nothing that'll affect
      users who don't have the devices concerned.  At least the wm8974 bug
      indicates that there's not too many users of some of these devices.
      0fb0b822
    • Mark Brown's avatar
      Merge remote-tracking branches 'asoc/fix/davinci', 'asoc/fix/es8328',... · 3dd5fc0e
      Mark Brown authored
      Merge remote-tracking branches 'asoc/fix/davinci', 'asoc/fix/es8328', 'asoc/fix/fsl-sai', 'asoc/fix/rockchip', 'asoc/fix/sgtl5000' and 'asoc/fix/wm8974' into asoc-linus
      3dd5fc0e
    • Linus Torvalds's avatar
      Merge branch 'for-linus' of git://git.kernel.dk/linux-block · 24bc3ea5
      Linus Torvalds authored
      Pull block layer fixes from Jens Axboe:
       "Three small fixes for 4.4 final. Specifically:
      
         - The segment issue fix from Junichi, where the old IO path does a
           bio limit split before potentially bouncing the pages.  We need to
           do that in the right order, to ensure that limitations are met.
      
         - A NVMe surprise removal IO hang fix from Keith.
      
         - A use-after-free in null_blk, introduced by a previous patch in
           this series.  From Mike Krinkin"
      
      * 'for-linus' of git://git.kernel.dk/linux-block:
        null_blk: fix use-after-free error
        block: ensure to split after potentially bouncing a bio
        NVMe: IO ending fixes on surprise removal
      24bc3ea5
  8. 22 Dec, 2015 9 commits