Merge tag 'hwmon-for-linus-v4.7-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging

Pull hwmon fix from Guenter Roeck:
 "Improve fan type detection for dell-smm to prevent kernel hang"

* tag 'hwmon-for-linus-v4.7-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging:
  hwmon: (dell-smm) Cache fan_type() calls and change fan detection

Pull ACPI fix from Rafael Wysocki:
 "Stable-candidate fix for a deadlock in ACPICA introduced during the
  4.5 development cycle by a commit attempting to improve the handling
  of AML code that doesn't belong to any namespace objects in a given
  definition block (Lv Zheng)"

* tag 'acpi-4.7-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  ACPICA: Namespace: Fix deadlock triggered by MLC support in dynamic table loading

Pull power management fixes from Rafael Wysocki:
 "Fix for a latent cpufreq driver bug uncovered by a recent ACPICA
  change and several fixes for the devfreq framework, including one fix
  for an issue introduced recently.

  Specifics:

   - Fix a latent initialization issue in the pcc-cpufreq driver
     (incorrect initial value of a structure field) that has been
     uncovered by a recent ACPICA commit (Mike Galbraith).

   - Add a missing notification in an update_devfreq() error code path
     forgotten by a recent devfreq commit (Chanwoo Choi).

   - Fix devfreq device frequency initialization (Lukasz Luba).

   - Fix an incorrect IS_ERR() check in the devfreq framework discovered
     by the Smatch checker (Dan Carpenter).

   - Drop two excessive put_device() calls from the devfreq framework
     (MyungJoo Ham, Cai Zhiyong).

   - Fix a possible memory leak in the devfreq framework and drop an
     unnecessary kfree() invocation from it (MyungJoo Ham)"

* tag 'pm-4.7-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  PM / devfreq: Send the DEVFREQ_POSTCHANGE notification when target() is failed
  cpufreq: pcc-cpufreq: Fix doorbell.access_width
  PM / devfreq: fix initialization of current frequency in last status
  PM / devfreq: exynos-nocp: Remove incorrect IS_ERR() check
  PM / devfreq: remove double put_device
  PM / devfreq: fix double call put_device
  PM / devfreq: fix duplicated kfree on devfreq pointer
  PM / devfreq: devm_kzalloc to have dev pointer more precisely

Pull xen bug fixes from David Vrabel:

 - fix x86 PV dom0 crash during early boot on some hardware

 - fix two pciback bugs affects certain devices

 - fix potential overflow when clearing page tables in x86 PV

* tag 'for-linus-4.7b-rc4-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
  xen-pciback: return proper values during BAR sizing
  x86/xen: avoid m2p lookup when setting early page table entries
  xen/pciback: Fix conf_space read/write overlap check.
  x86/xen: fix upper bound of pmd loop in xen_cleanhighmap()
  xen/balloon: Fix declared-but-not-defined warning

Pull arm64 fixes from Will Deacon:
 "Here are a few more arm64 fixes, but things do finally appear to be
  slowing down.  The main fix is avoiding hibernation in a previously
  unanticipated situation where we have CPUs parked in the kernel, but
  it's all good stuff.

   - Fix icache/dcache sync for anonymous pages under migration
   - Correct the ASID limit check
   - Fix parallel builds of Image and Image.gz
   - Refuse to hibernate when we have CPUs that we can't offline"

* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
  arm64: hibernate: Don't hibernate on systems with stuck CPUs
  arm64: smp: Add function to determine if cpus are stuck in the kernel
  arm64: mm: remove page_mapping check in __sync_icache_dcache
  arm64: fix boot image dependencies to not generate invalid images
  arm64: update ASID limit

Pull nfsd bugfixes from Bruce Fields:
 "Fix missing server-side permission checks on setting NFS ACLs"

* tag 'nfsd-4.7-2' of git://linux-nfs.org/~bfields/linux:
  nfsd: check permissions when setting ACLs
  posix_acl: Add set_posix_acl

The INIT_TASK() initializer was similarly confused about the stack vs
thread_info allocation that the allocators had, and that were fixed in
commit b235beea ("Clarify naming of thread info/stack allocators").

The task ->stack pointer only incidentally ends up having the same value
as the thread_info, and in fact that will change.

So fix the initial task struct initializer to point to 'init_stack'
instead of 'init_thread_info', and make sure the ia64 definition for
that exists.

This actually makes the ia64 tsk->stack pointer be sensible for the
initial task, but not for any other task.  As mentioned in commit
b235beea, that whole pointer isn't actually used on ia64, since
task_stack_page() there just points to the (single) allocation.

All the other architectures seem to have copied the 'init_stack'
definition, even if it tended to be generally unusued.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

As the actual pointer value is the same for the thread stack allocation
and the thread_info, code that confused the two worked fine, but will
break when the thread info is moved away from the stack allocation.  It
also looks very confusing.

For example, the kprobe code wanted to know the current top of stack.
To do that, it used this:

	(unsigned long)current_thread_info() + THREAD_SIZE

which did indeed give the correct value.  But it's not only a fairly
nonsensical expression, it's also rather complex, especially since we
actually have this:

	static inline unsigned long current_top_of_stack(void)

which not only gives us the value we are interested in, but happens to
be how "current_thread_info()" is currently defined as:

	(struct thread_info *)(current_top_of_stack() - THREAD_SIZE);

so using current_thread_info() to figure out the top of the stack really
is a very round-about thing to do.

The other cases are just simpler confusion about task_thread_info() vs
task_stack_page(), which currently return the same pointer - but if you
want the stack page, you really should be using the latter one.

And there was one entirely unused assignment of the current stack to a
thread_info pointer.

All cleaned up to make more sense today, and make it easier to move the
thread_info away from the stack in the future.

No semantic changes.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

We've had the thread info allocated together with the thread stack for
most architectures for a long time (since the thread_info was split off
from the task struct), but that is about to change.

But the patches that move the thread info to be off-stack (and a part of
the task struct instead) made it clear how confused the allocator and
freeing functions are.

Because the common case was that we share an allocation with the thread
stack and the thread_info, the two pointers were identical.  That
identity then meant that we would have things like

	ti = alloc_thread_info_node(tsk, node);
	...
	tsk->stack = ti;

which certainly _worked_ (since stack and thread_info have the same
value), but is rather confusing: why are we assigning a thread_info to
the stack? And if we move the thread_info away, the "confusing" code
just gets to be entirely bogus.

So remove all this confusion, and make it clear that we are doing the
stack allocation by renaming and clarifying the function names to be
about the stack.  The fact that the thread_info then shares the
allocation is an implementation detail, and not really about the
allocation itself.

This is a pure renaming and type fix: we pass in the same pointer, it's
just that we clarify what the pointer means.

The ia64 code that actually only has one single allocation (for all of
task_struct, thread_info and kernel thread stack) now looks a bit odd,
but since "tsk->stack" is actually not even used there, that oddity
doesn't matter.  It would be a separate thing to clean that up, I
intentionally left the ia64 changes as a pure brute-force renaming and
type change.
Acked-by: Andy Lutomirski <luto@amacapital.net>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

* pm-devfreq-fixes:
  PM / devfreq: Send the DEVFREQ_POSTCHANGE notification when target() is failed
  PM / devfreq: fix initialization of current frequency in last status
  PM / devfreq: exynos-nocp: Remove incorrect IS_ERR() check
  PM / devfreq: remove double put_device
  PM / devfreq: fix double call put_device
  PM / devfreq: fix duplicated kfree on devfreq pointer
  PM / devfreq: devm_kzalloc to have dev pointer more precisely

* pm-cpufreq-fixes:
  cpufreq: pcc-cpufreq: Fix doorbell.access_width

* acpica-fixes:
  ACPICA: Namespace: Fix deadlock triggered by MLC support in dynamic table loading

Use set_posix_acl, which includes proper permission checks, instead of
calling ->set_acl directly.  Without this anyone may be able to grant
themselves permissions to a file by setting the ACL.

Lock the inode to make the new checks atomic with respect to set_acl.
(Also, nfsd was the only caller of set_acl not locking the inode, so I
suspect this may fix other races.)

This also simplifies the code, and ensures our ACLs are checked by
posix_acl_valid.

The permission checks and the inode locking were lost with commit
4ac7249e, which changed nfsd to use the set_acl inode operation directly
instead of going through xattr handlers.
Reported-by: David Sinquin <david@sinquin.eu>
[agreunba@redhat.com: use set_posix_acl]
Fixes: 4ac7249e
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: stable@vger.kernel.org
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

Factor out part of posix_acl_xattr_set into a common function that takes
a posix_acl, which nfsd can also call.

The prototype already exists in include/linux/posix_acl.h.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Cc: stable@vger.kernel.org
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

Reads following writes with all address bits set to 1 should return all
changeable address bits as one, not the BAR size (nor, as was the case
for the upper half of 64-bit BARs, the high half of the region's end
address). Presumably this didn't cause any problems so far because
consumers use the value to calculate the size (usually via val & -val),
and do nothing else with it.

But also consider the exception here: Unimplemented BARs should always
return all zeroes.

And finally, the check for whether to return the sizing address on read
for the ROM BAR should ignore all non-address bits, not just the ROM
Enable one.
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>

Pull UBI/UBIFS fixes from Richard Weinberger:
 "This contains fixes for two critical bugs in UBI and UBIFS:

   - fix the possibility of losing data upon a power cut when UBI tries
     to recover from a write error

   - fix page migration on UBIFS.  It turned out that the default page
     migration function is not suitable for UBIFS"

* tag 'upstream-4.7-rc5' of git://git.infradead.org/linux-ubifs:
  UBIFS: Implement ->migratepage()
  mm: Export migrate_page_move_mapping and migrate_page_copy
  ubi: Make recover_peb power cut aware
  gpio: make library immune to error pointers
  gpio: make sure gpiod_to_irq() returns negative on NULL desc
  gpio: 104-idi-48: Fix missing spin_lock_init for ack_lock

Pull drm fixes from Dave Airlie:
 "This is the drm fixes tree for 4.7-rc5.

  It's a bit larger than normal, due to fixes for production AMD Polaris
  GPUs.  We only merged support for these in 4.7-rc1 so it would be good
  if we got all the fixes into final.  The changes don't hit any other
  hardware.

  Other than the amdgpu Polaris changes:

   - A single fix for atomic modesetting WARN
   - Nouveau fix for when fbdev is disabled
   - i915 fixes for FBC on Haswell and displayport regression
   - Exynos fix for a display panel regression and some other minor changes
   - Atmel fixes for scaling and OF graph interaction
   - Allwiinner build, warning and probing fixes
   - AMD GPU non-polaris fix for num_rbs and some minor fixes

  Also I've just moved house, and my new place is Internet challenged
  due to incompetent incumbent ISPs, hopefully sorted out in a couple of
  weeks, so I might not be too responsive over the next while.  It also
  helps Daniel is on holidays for those couple of weeks as well"

* tag 'drm-fixes-for-v4.7-rc5' of git://people.freedesktop.org/~airlied/linux: (38 commits)
  drm/atomic: Make drm_atomic_legacy_backoff reset crtc->acquire_ctx
  drm/nouveau: fix for disabled fbdev emulation
  drm/i915/fbc: Disable on HSW by default for now
  drm/i915: Revert DisplayPort fast link training feature
  drm/amd/powerplay: enable clock stretch feature for polaris
  drm/amdgpu/gfx8: update golden setting for polaris10
  drm/amd/powerplay: enable avfs feature for polaris
  drm/amdgpu/atombios: add avfs struct for Polaris10/11
  drm/amd/powerplay: add avfs related define for polaris
  drm/amd/powrplay: enable stutter_mode for polaris.
  drm/amd/powerplay: disable UVD SMU handshake for MCLK.
  drm/amd/powerplay: initialize variables which were missed.
  drm/amd/powerplay: enable PowerContainment feature for polaris10/11.
  drm/amd/powerplay: need to notify system bios pcie device ready
  drm/amd/powerplay: fix bug that function parameter was incorect.
  drm/amd/powerplay: fix logic error.
  drm: atmel-hlcdc: Fix OF graph parsing
  drm: atmel-hlcdc: actually disable scaling when no scaling is required
  drm/amdgpu: initialize amdgpu_cgs_acpi_eval_object result value
  drm/amdgpu: precedence bug in amdgpu_device_init()
  ...

Pull PCI fix from Bjorn Helgaas:
 "Here's a small fix for v4.7.  This problem was actually introduced in
  v4.6 when we unified Kconfig, making PCIe support available everywhere
  including sparc, where config reads into unaligned buffers cause
  warnings.  This fix is from Dave Miller.

  As a reminder, any future PCI fixes for v4.7 will probably come from
  Alex Williamson, since I'll be on vacation for most of the rest of
  this cycle.  I should be back about the time the merge window opens"

* tag 'pci-v4.7-fixes-1' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci:
  PCI: Fix unaligned accesses in VC code

Atomic updates may acquire more state than initially locked through
drm_modeset_lock_crtc, running with heavy stress can cause a
WARN_ON(crtc->acquire_ctx) in drm_modeset_lock_crtc:

[  601.491296] ------------[ cut here ]------------
[  601.491366] WARNING: CPU: 0 PID: 2411 at
drivers/gpu/drm/drm_modeset_lock.c:191 drm_modeset_lock_crtc+0xeb/0xf0 [drm]
[  601.491369] Modules linked in: drm i915 drm_kms_helper
[  601.491414] CPU: 0 PID: 2411 Comm: kms_cursor_lega Tainted: G     U 4.7.0-rc4-patser+ #4798
[  601.491417] Hardware name: Intel Corporation Skylake Client
[  601.491420]  0000000000000000 ffff88044d153c98 ffffffff812ead28 0000000000000000
[  601.491425]  0000000000000000 ffff88044d153cd8 ffffffff810868e6 000000bf58058030
[  601.491431]  ffff880088b415e8 ffff880458058030 ffff88008a271548 ffff88008a271568
[  601.491436] Call Trace:
[  601.491443]  [<ffffffff812ead28>] dump_stack+0x4d/0x65
[  601.491447]  [<ffffffff810868e6>] __warn+0xc6/0xe0
[  601.491452]  [<ffffffff81086968>] warn_slowpath_null+0x18/0x20
[  601.491472]  [<ffffffffc00d4ffb>] drm_modeset_lock_crtc+0xeb/0xf0 [drm]
[  601.491491]  [<ffffffffc00c5526>] drm_mode_cursor_common+0x66/0x180 [drm]
[  601.491509]  [<ffffffffc00c91cc>] drm_mode_cursor_ioctl+0x3c/0x40 [drm]
[  601.491524]  [<ffffffffc00bc94d>] drm_ioctl+0x14d/0x530 [drm]
[  601.491540]  [<ffffffffc00c9190>] ? drm_mode_setcrtc+0x520/0x520 [drm]
[  601.491545]  [<ffffffff81176aeb>] ? handle_mm_fault+0x106b/0x1430
[  601.491550]  [<ffffffff81108441>] ? stop_one_cpu+0x61/0x70
[  601.491556]  [<ffffffff811bb71d>] do_vfs_ioctl+0x8d/0x570
[  601.491560]  [<ffffffff81290d7e>] ? security_file_ioctl+0x3e/0x60
[  601.491565]  [<ffffffff811bbc74>] SyS_ioctl+0x74/0x80
[  601.491571]  [<ffffffff810e321c>] ? posix_get_monotonic_raw+0xc/0x10
[  601.491576]  [<ffffffff8175b11b>] entry_SYSCALL_64_fastpath+0x13/0x8f
[  601.491581] ---[ end trace 56f3d3d85f000d00 ]---

For good measure, test mode_config.acquire_ctx too, although this should
never happen.

Testcase: kms_cursor_legacy
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: stable@vger.kernel.org
Signed-off-by: Dave Airlie <airlied@redhat.com>

A bit bigger than I would normally like, but most of the large changes are
for polaris support and since polaris went upstream in 4.7, I'd like
to get the fixes in so it's in good shape when the hw becomes available.
The major changes only touch the polaris code so there is little chance
for regressions on other asics.  The rest are just the usual collection
of bug fixes.

* 'drm-fixes-4.7' of git://people.freedesktop.org/~agd5f/linux:
  drm/amd/powerplay: enable clock stretch feature for polaris
  drm/amdgpu/gfx8: update golden setting for polaris10
  drm/amd/powerplay: enable avfs feature for polaris
  drm/amdgpu/atombios: add avfs struct for Polaris10/11
  drm/amd/powerplay: add avfs related define for polaris
  drm/amd/powrplay: enable stutter_mode for polaris.
  drm/amd/powerplay: disable UVD SMU handshake for MCLK.
  drm/amd/powerplay: initialize variables which were missed.
  drm/amd/powerplay: enable PowerContainment feature for polaris10/11.
  drm/amd/powerplay: need to notify system bios pcie device ready
  drm/amd/powerplay: fix bug that function parameter was incorect.
  drm/amd/powerplay: fix logic error.
  drm/amdgpu: initialize amdgpu_cgs_acpi_eval_object result value
  drm/amdgpu: precedence bug in amdgpu_device_init()
  drm/amdgpu: fix num_rbs exposed to userspace (v2)
  drm/amdgpu: missing bounds check in amdgpu_set_pp_force_state()

Merge branch 'exynos-drm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/daeinki/drm-exynos into drm-fixes

Since HW trigger mode was suppoted we have faced with a issue
that Display panel didn't work correctly when trigger mode was changed
in booting time.
For this, we keep trigger mode with SW trigger mode in default mode
like we did before.

However, we will need to consider PSR(Panel Self Reflash) mode to resolve
this issue fundamentally later.

* 'exynos-drm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/daeinki/drm-exynos:
  drm/exynos: use logical AND in exynos_drm_plane_check_size()
  drm/exynos: remove superfluous inclusions of fbdev header
  drm/exynos: g2d: drop the _REG postfix from the stride defines
  drm/exynos: don't use HW trigger for Exynos5420/5422/5800
  drm/exynos: fimd: don't set .has_hw_trigger in s3c6400 driver data
  drm/exynos: dp: Fix NULL pointer dereference due uninitialized connector

Two bug fixes for the atmel-hlcdc driver.

* tag 'drm-atmel-hlcdc-fixes/for-4.7-rc5' of github.com:bbrezillon/linux-at91:
  drm: atmel-hlcdc: Fix OF graph parsing
  drm: atmel-hlcdc: actually disable scaling when no scaling is required

Merge tag 'sunxi-drm-fixes-for-4.7' of https://git.kernel.org/pub/scm/linux/kernel/git/mripard/linux into drm-fixes

Allwinner sun4i DRM driver fixes

A bunch of fixes that address:
  - Compilation errors in various corner cases
  - Move to helpers
  - Fix the pixel clock computation
  - Fix our panel probe

* tag 'sunxi-drm-fixes-for-4.7' of https://git.kernel.org/pub/scm/linux/kernel/git/mripard/linux:
  drm: sun4i: do cleanup if RGB output init fails
  drm/sun4i: Convert to connector register helpers
  drm/sun4i: remove simplefb at probe
  drm/sun4i: rgb: panel is an error pointer
  drm/sun4i: defer only if we didn't find our panel
  drm/sun4i: rgb: Validate the clock rate
  drm/sun4i: request exact rates to our parents
  drm: sun4i: fix probe error handling
  drm: sun4i: print DMA address correctly
  drm/sun4i: add COMMON_CLK dependency

 Hi Dave, just a couple of display fixes, both stable stuff. Maybe we'll
be able to enable fbc by default one day.

* tag 'drm-intel-fixes-2016-06-22' of git://anongit.freedesktop.org/drm-intel:
  drm/i915/fbc: Disable on HSW by default for now
  drm/i915: Revert DisplayPort fast link training feature

* 'linux-4.7' of git://github.com/skeggsb/linux:
  drm/nouveau: fix for disabled fbdev emulation

Hello,

after this commit:

commit f045f459
Author: Ben Skeggs <bskeggs@redhat.com>
Date:   Thu Jun 2 12:23:31 2016 +1000
    drm/nouveau/fbcon: fix out-of-bounds memory accesses

kernel started to oops when loading nouveau module when using GTX 780 Ti
video adapter. This patch fixes the problem.

Bug report: https://bugzilla.kernel.org/show_bug.cgi?id=120591Signed-off-by: Dmitrii Tcvetkov <demfloro@demfloro.ru>
Suggested-by: Ilia Mirkin <imirkin@alum.mit.edu>
Fixes: f045f459 ("nouveau_fbcon_init()")
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Cc: stable@vger.kernel.org

This patch sends the DEVFREQ_POSTCHANGE notification when
devfreq->profile->targer() is failed. The PRECHANGE/POSTCHANGE
should be paired.

Fixes: 0fe3a664 (PM / devfreq: Add new DEVFREQ_TRANSITION_NOTIFIER notifier)
Reported-by: Lin Huang <hl@rock-chips.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

Commit 920de6eb (ACPICA: Hardware: Enhance
acpi_hw_validate_register() with access_width/bit_offset awareness)
apparently exposed a latent bug, doorbell.access_width is initialized
to 64, but per Lv Zheng, it should be 4, and indeed, making that
change does bring pcc-cpufreq back to life.

Fixes: 920de6eb (ACPICA: Hardware: Enhance acpi_hw_validate_register() with access_width/bit_offset awareness)
Suggested-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Mike Galbraith <umgwanakikbuti@gmail.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

None of the code actually wants a thread_info, it all wants a
task_struct, and it's just converting to a thread_info pointer much too
early.

No semantic change.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

None of the code actually wants a thread_info, it all wants a
task_struct, and it's just converting back and forth between the two
("ti->task" to get the task_struct from the thread_info, and
"task_thread_info(task)" to go the other way).

No semantic change.
Acked-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

When page tables entries are set using xen_set_pte_init() during early
boot there is no page fault handler that could handle a fault when
performing an M2P lookup.

In 64 bit guests (usually dom0) early_ioremap() would fault in
xen_set_pte_init() because an M2P lookup faults because the MFN is in
MMIO space and not mapped in the M2P.  This lookup is done to see if
the PFN in in the range used for the initial page table pages, so that
the PTE may be set as read-only.

The M2P lookup can be avoided by moving the check (and clear of RW)
earlier when the PFN is still available.
Reported-by: Kevin Moraga <kmoragas@riseup.net>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Reviewed-by: Juergen Gross <jgross@suse.com>

On more Dell machines (e.g. Dell Precision M3800) fan_type() call is too
expensive (CPU is too long in SMM mode) and cause kernel to hang. This is
bug in Dell SMM or BIOS.

This patch caches type for each fan (as it should not change) and changes
the way how fan presense is detected. First it try function fan_status()
as was before commit f989e554 ("i8k: Add support for fan labels"). And
if that fails fallback to fan_type(). *_status() functions can fail in case
fan is not currently accessible (e.g. present on GPU which is currently
turned off).
Reported-by: Tolga Cakir <cevelnet@gmail.com>
Signed-off-by: Pali Rohár <pali.rohar@gmail.com>
Link: https://bugzilla.kernel.org/show_bug.cgi?id=112021
Cc: stable@vger.kernel.org # v4.0+, will need backport
Tested-by: Tolga Cakir <cevelnet@gmail.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

Pull devfreq fixes for v4.7 from  MyungJoo Ham.

* 'fixes' of https://git.kernel.org/pub/scm/linux/kernel/git/mzx/devfreq:
  PM / devfreq: fix initialization of current frequency in last status
  PM / devfreq: exynos-nocp: Remove incorrect IS_ERR() check
  PM / devfreq: remove double put_device
  PM / devfreq: fix double call put_device
  PM / devfreq: fix duplicated kfree on devfreq pointer
  PM / devfreq: devm_kzalloc to have dev pointer more precisely

Current overlap check is evaluating to false a case where a filter
field is fully contained (proper subset) of a r/w request.  This
change applies classical overlap check instead to include all the
scenarios.

More specifically, for (Hilscher GmbH CIFX 50E-DP(M/S)) device driver
the logic is such that the entire confspace is read and written in 4
byte chunks. In this case as an example, CACHE_LINE_SIZE,
LATENCY_TIMER and PCI_BIST are arriving together in one call to
xen_pcibk_config_write() with offset == 0xc and size == 4.  With the
exsisting overlap check the LATENCY_TIMER field (offset == 0xd, length
== 1) is fully contained in the write request and hence is excluded
from write, which is incorrect.
Signed-off-by: Andrey Grodzovsky <andrey2805@gmail.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Reviewed-by: Jan Beulich <JBeulich@suse.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>

xen_cleanhighmap() is operating on level2_kernel_pgt only. The upper
bound of the loop setting non-kernel-image entries to zero should not
exceed the size of level2_kernel_pgt.
Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Juergen Gross <jgross@suse.com>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>

Fix a declared-but-not-defined warning when building with
XEN_BALLOON_MEMORY_HOTPLUG=n. This fixes a regression introduced by
commit dfd74a1e ("xen/balloon: Fix crash when ballooning on x86 32
bit PAE").
Signed-off-by: Ross Lagerwall <ross.lagerwall@citrix.com>
Acked-by: Juergen Gross <jgross@suse.com>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>

During page migrations UBIFS might get confused
and the following assert triggers:
[  213.480000] UBIFS assert failed in ubifs_set_page_dirty at 1451 (pid 436)
[  213.490000] CPU: 0 PID: 436 Comm: drm-stress-test Not tainted 4.4.4-00176-geaa802524636-dirty #1008
[  213.490000] Hardware name: Allwinner sun4i/sun5i Families
[  213.490000] [<c0015e70>] (unwind_backtrace) from [<c0012cdc>] (show_stack+0x10/0x14)
[  213.490000] [<c0012cdc>] (show_stack) from [<c02ad834>] (dump_stack+0x8c/0xa0)
[  213.490000] [<c02ad834>] (dump_stack) from [<c0236ee8>] (ubifs_set_page_dirty+0x44/0x50)
[  213.490000] [<c0236ee8>] (ubifs_set_page_dirty) from [<c00fa0bc>] (try_to_unmap_one+0x10c/0x3a8)
[  213.490000] [<c00fa0bc>] (try_to_unmap_one) from [<c00fadb4>] (rmap_walk+0xb4/0x290)
[  213.490000] [<c00fadb4>] (rmap_walk) from [<c00fb1bc>] (try_to_unmap+0x64/0x80)
[  213.490000] [<c00fb1bc>] (try_to_unmap) from [<c010dc28>] (migrate_pages+0x328/0x7a0)
[  213.490000] [<c010dc28>] (migrate_pages) from [<c00d0cb0>] (alloc_contig_range+0x168/0x2f4)
[  213.490000] [<c00d0cb0>] (alloc_contig_range) from [<c010ec00>] (cma_alloc+0x170/0x2c0)
[  213.490000] [<c010ec00>] (cma_alloc) from [<c001a958>] (__alloc_from_contiguous+0x38/0xd8)
[  213.490000] [<c001a958>] (__alloc_from_contiguous) from [<c001ad44>] (__dma_alloc+0x23c/0x274)
[  213.490000] [<c001ad44>] (__dma_alloc) from [<c001ae08>] (arm_dma_alloc+0x54/0x5c)
[  213.490000] [<c001ae08>] (arm_dma_alloc) from [<c035cecc>] (drm_gem_cma_create+0xb8/0xf0)
[  213.490000] [<c035cecc>] (drm_gem_cma_create) from [<c035cf20>] (drm_gem_cma_create_with_handle+0x1c/0xe8)
[  213.490000] [<c035cf20>] (drm_gem_cma_create_with_handle) from [<c035d088>] (drm_gem_cma_dumb_create+0x3c/0x48)
[  213.490000] [<c035d088>] (drm_gem_cma_dumb_create) from [<c0341ed8>] (drm_ioctl+0x12c/0x444)
[  213.490000] [<c0341ed8>] (drm_ioctl) from [<c0121adc>] (do_vfs_ioctl+0x3f4/0x614)
[  213.490000] [<c0121adc>] (do_vfs_ioctl) from [<c0121d30>] (SyS_ioctl+0x34/0x5c)
[  213.490000] [<c0121d30>] (SyS_ioctl) from [<c000f2c0>] (ret_fast_syscall+0x0/0x34)

UBIFS is using PagePrivate() which can have different meanings across
filesystems. Therefore the generic page migration code cannot handle this
case correctly.
We have to implement our own migration function which basically does a
plain copy but also duplicates the page private flag.
UBIFS is not a block device filesystem and cannot use buffer_migrate_page().

Cc: stable@vger.kernel.org
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
[rw: Massaged changelog, build fixes, etc...]
Signed-off-by: Richard Weinberger <richard@nod.at>
Acked-by: Christoph Hellwig <hch@lst.de>

Export these symbols such that UBIFS can implement
->migratepage.

Cc: stable@vger.kernel.org
Signed-off-by: Richard Weinberger <richard@nod.at>
Acked-by: Christoph Hellwig <hch@lst.de>

recover_peb() was never power cut aware,
if a power cut happened right after writing the VID header
upon next attach UBI would blindly use the new partial written
PEB and all data from the old PEB is lost.

In order to make recover_peb() power cut aware, write the new
VID with a proper crc and copy_flag set such that the UBI attach
process will detect whether the new PEB is completely written
or not.
We cannot directly use ubi_eba_atomic_leb_change() since we'd
have to unlock the LEB which is facing a write error.

Cc: stable@vger.kernel.org
Reported-by: Jörg Pfähler <pfaehler@isse.de>
Reviewed-by: Jörg Pfähler <pfaehler@isse.de>
Signed-off-by: Richard Weinberger <richard@nod.at>

Most functions that take a GPIO descriptor in need to check the
descriptor for IS_ERR(). We do this mostly in the VALIDATE_DESC()
macro except for the gpiod_to_irq() function which needs special
handling.

Cc: stable@vger.kernel.org
Reported-by: Grygorii Strashko <grygorii.strashko@ti.com>
Reviewed-by: Grygorii Strashko <grygorii.strashko@ti.com>
Acked-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

commit 54d77198
("gpio: bail out silently on NULL descriptors")
doesn't work for gpiod_to_irq(): drivers assume that NULL
descriptors will give negative IRQ numbers in return.

It has been pointed out that returning 0 is NO_IRQ and that
drivers should be amended to treat this as an error, but that
is for the longer term: now let us repair the semantics.

Cc: Maxime Ripard <maxime.ripard@free-electrons.com>
Reported-by: Hans de Goede <hdegoede@redhat.com>
Tested-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>