Xenial update to v4.4.61 stable release

[Tim Gardner]

SRU Justification

    Impact:
       The upstream process for stable tree updates is quite similar
       in scope to the Ubuntu SRU process, e.g., each patch has to
       demonstrably fix a bug, and each patch is vetted by upstream
       by originating either directly from a mainline/stable Linux tree or
       a minimally backported form of that patch. The v4.4.61 upstream stable
       patch set is now available. It should be included in the Ubuntu
       kernel as well.

       git://git.kernel.org/

    TEST CASE: TBD

       The following patches from the v4.4.61 stable release shall be applied:

drm/vmwgfx: Type-check lookups of fence objects
drm/vmwgfx: NULL pointer dereference in vmw_surface_define_ioctl()
drm/vmwgfx: avoid calling vzalloc with a 0 size in vmw_get_cap_3d_ioctl()
drm/ttm, drm/vmwgfx: Relax permission checking when opening surfaces
drm/vmwgfx: Remove getparam error message
drm/vmwgfx: fix integer overflow in vmw_surface_define_ioctl()
sysfs: be careful of error returns from ops->show()
staging: android: ashmem: lseek failed due to no FMODE_LSEEK.
arm/arm64: KVM: Take mmap_sem in stage2_unmap_vm
arm/arm64: KVM: Take mmap_sem in kvm_arch_prepare_memory_region
iio: bmg160: reset chip when probing
Reset TreeId to zero on SMB2 TREE_CONNECT
ptrace: fix PTRACE_LISTEN race corrupting task->state
ring-buffer: Fix return value check in test_ringbuffer()
metag/usercopy: Drop unused macros
metag/usercopy: Fix alignment error checking
metag/usercopy: Add early abort to copy_to_user
metag/usercopy: Zero rest of buffer from copy_from_user
metag/usercopy: Set flags before ADDZ
metag/usercopy: Fix src fixup in from user rapf loops
metag/usercopy: Add missing fixups
powerpc/mm: Add missing global TLB invalidate if cxl is active
powerpc: Don't try to fix up misaligned load-with-reservation instructions
nios2: reserve boot memory for device tree
s390/decompressor: fix initrd corruption caused by bss clear
s390/uaccess: get_user() should zero on failure (again)
MIPS: Force o32 fp64 support on 32bit MIPS64r6 kernels
MIPS: ralink: Fix typos in rt3883 pinctrl
MIPS: End spinlocks with .insn
MIPS: Lantiq: fix missing xbar kernel panic
MIPS: Flush wrong invalid FTLB entry for huge page
mm/mempolicy.c: fix error handling in set_mempolicy and mbind.
Linux 4.4.61

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux - 4.4.0-78.99

---------------
linux (4.4.0-78.99) xenial; urgency=low

  * linux: 4.4.0-78.99 -proposed tracker (LP: #1686645)

  * Please backport fix to reference leak in cgroup blkio throttle
    (LP: #1683976)
    - block: fix module reference leak on put_disk() call for cgroups throttle

  * UbuntuKVM guest crashed while running I/O stress test with Ubuntu kernel
    4.4.0-47-generic (LP: #1659111)
    - block: Unhash block device inodes on gendisk destruction
    - block: Use pointer to backing_dev_info from request_queue
    - block: Dynamically allocate and refcount backing_dev_info
    - block: Make blk_get_backing_dev_info() safe without open bdev
    - block: Get rid of blk_get_backing_dev_info()
    - block: Move bdev_unhash_inode() after invalidate_partition()
    - block: Unhash also block device inode for the whole device
    - block: Revalidate i_bdev reference in bd_aquire()
    - block: Initialize bd_bdi on inode initialization
    - block: Move bdi_unregister() to del_gendisk()
    - block: Allow bdi re-registration
    - bdi: Fix use-after-free in wb_congested_put()
    - block: Make del_gendisk() safer for disks without queues
    - block: Fix bdi assignment to bdev inode when racing with disk delete
    - bdi: Mark congested->bdi as internal
    - bdi: Make wb->bdi a proper reference
    - bdi: Unify bdi->wb_list handling for root wb_writeback
    - bdi: Shutdown writeback on all cgwbs in cgwb_bdi_destroy()
    - bdi: Do not wait for cgwbs release in bdi_unregister()
    - bdi: Rename cgwb_bdi_destroy() to cgwb_bdi_unregister()
    - block: Fix oops in locked_inode_to_wb_and_lock_list()
    - kobject: Export kobject_get_unless_zero()
    - block: Fix oops scsi_disk_get()

  * Touchpad not working correctly after kernel upgrade (LP: #1662589)
    - Input: ALPS - fix V8+ protocol handling (73 03 28)

  * Xenial update to v4.4.62 stable release (LP: #1683728)
    - drm/i915: Avoid tweaking evaluation thresholds on Baytrail v3
    - drm/i915: Stop using RP_DOWN_EI on Baytrail
    - usb: dwc3: gadget: delay unmap of bounced requests
    - mtd: bcm47xxpart: fix parsing first block after aligned TRX
    - MIPS: Introduce irq_stack
    - MIPS: Stack unwinding while on IRQ stack
    - MIPS: Only change $28 to thread_info if coming from user mode
    - MIPS: Switch to the irq_stack in interrupts
    - MIPS: Select HAVE_IRQ_EXIT_ON_IRQ_STACK
    - MIPS: IRQ Stack: Fix erroneous jal to plat_irq_dispatch
    - crypto: caam - fix RNG deinstantiation error checking
    - Linux 4.4.62

  * ifup service of network device stay active after driver stop (LP: #1672144)
    - net: use net->count to check whether a netns is alive or not

  * [Hyper-V] mkfs regression in kernel 4.4+ (LP: #1682215)
    - block: relax check on sg gap

  * [Feature] KBL: intel_powerclamp driver support (LP: #1591641)
    - thermal/powerclamp: remove cpu whitelist
    - thermal/powerclamp: correct cpu support check
    - thermal/powerclamp: add back module device table

  * sysfs channel reads of lps22hb pressure sensor are stale (LP: #1682103)
    - iio: st_pressure: initialize lps22hb bootime

  * Backlight control does no...