Rework the ACPI dock station driver to store ACPI device object
pointers instead of ACPI handles in its internal data structures.

The purpose is moslty to make subsequent simplifications possible,
but also this allows the overall code size to be reduced slightly.
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

In order for the ACPI dock station code to be able to use the
callbacks pointed to by the ACPI device objects' hotplug contexts
add a .fixup() callback pointer to struct acpi_hotplug_context.
That callback will be useful to handle PCI devices located in
dock stations.
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

After recent changes adding dock station handling to the ACPI hotplug
core, it is not necessary to clear the .event() pointer in the
ACPIPHP device hotplug context for dock stations any more, so don't
do that.
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

To allow user space to check which ACPI device object the dock
station is represented by, make acpi_dock_add() indicate to
platform_device_register_full() which ACPI device object should
be the companion of the new platform device.

This also ensures that the ACPI device object in question will
not go away while the dock platform device is present (which is
always).
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

Since we already know what the device's PNP IDs are when
acpi_device_is_battery() is called, it is not necessary to run
acpi_get_object_info() for the device in that function.  Instead, if
acpi_device_is_battery() is passed a pointer to a struct acpi_device
object, it can use the list of PNP IDs from that object, so make that
happen and modify the function's header accordingly
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

The ACPI dock station code carries out an extra namespace scan
before the main one in order to find and register all of the dock
device objects.  Then, it registers a notify handler for each of
them for handling dock events.

However, dock device objects need not be scanned for upfront.  They
very well can be enumerated and registered during the first phase
of the main namespace scan, before attaching scan handlers and ACPI
drivers to ACPI device objects.  Then, the dependent devices can be
added to the in the second phase.  That makes it possible to drop
the extra namespace scan, so do it.

Moreover, it is not necessary to register notify handlers for all
of the dock stations' namespace nodes, becuase notifications may
be dispatched from the global notify handler for them.  Do that and
drop two functions used for dock notify handling, acpi_dock_deferred_cb()
and dock_notify_handler(), that aren't necessary any more.

Finally, some dock station objects have _HID objects matching the
ACPI container scan handler which causes it to claim those objects
and try to handle their hotplug, but that is not a good idea,
because those objects have their own special hotplug handling anyway.
For this reason, the hotplug_notify flag should not be set for ACPI
device objects representing dock stations and the container scan
handler should be made ignore those objects, so make that happen.
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

Currently, ACPIPHP does not add hotplug context to devices that
should be handled by the native PCI hotplug (PCIeHP) code.  The
reason why was because PCIeHP didn't know about the devices'
connections with ACPI and would not clean up things properly
during an eject of an ACPI-backed device, for example.

However, after recent changes that made the ACPI core create struct
acpi_device objects for all namespace nodes regardless of the
underlying devices' status and added PCI rescan-remove locking to
both ACPIPHP and PCIeHP, that concern is not valid any more.
Namely, after those changes PCIeHP need not care about the ACPI
side of things any more and it should be serialized with respect to
ACPIPHP and they won't be running concurrently with each other in
any case.

For this reason, make ACPIPHP to add its hotplug context to
all devices with ACPI companions, even the ones that should be
handled by PCIeHP in principle.  That may work around hotplug
issues on some systems where PCIeHP is supposed to work, but it
doesn't and the ACPI hotplug signaling works instead.
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

The name of register_slot() doesn't really reflect what the function
is does, so rename it to acpiphp_add_context() and add a proper
kerneldoc comment to it.
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

After recent ACPI core changes acpi_bus_get_device() will always
succeed for dock station ACPI device objects, so show_docked()
should not use that function's return value as an indicator of
whether or not the dock device is present.

Make it use acpi_device_enumerated() for this purpose.

Fixes: 202317a5 (ACPI / scan: Add acpi_device objects for all device nodes in the namespace)
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

Conflicts:
	drivers/pci/hotplug/acpiphp_glue.c

The ACPI specification (ACPI 5.0A, Section 6.3.7) says:

 _STA may return bit 0 clear (not present) with bit 3 set (device is
 functional). This case is used to indicate a valid device for which
 no device driver should be loaded (for example, a bridge device.)
 Children of this device may be present and valid. OSPM should
 continue enumeration below a device whose _STA returns this bit
 combination.

Evidently, some BIOSes follow that and return 0x0A from _STA, which
causes problems to happen when they trigger bus check or device check
notifications for those devices too.  Namely, ACPIPHP thinks that they
are gone and may drop them, for example, if such a notification is
triggered during a resume from system suspend.

To fix that, modify ACPICA to regard devies as present and
functioning if _STA returns both the ACPI_STA_DEVICE_ENABLED
and ACPI_STA_DEVICE_FUNCTIONING bits set for them.
Reported-and-tested-by: Peter Wu <lekensteyn@gmail.com>
Cc: 3.12+ <stable@vger.kernel.org> # 3.12+
[rjw: Subject and changelog, minor code modifications]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

After commit 202317a5 (ACPI / scan: Add acpi_device objects for
all device nodes in the namespace) acpi_bus_get_device() will always
return 0 for dock devices in dock_notify(), so the dock station
docking code under ACPI_NOTIFY_DEVICE_CHECK will never be executed
and docking will not work as a result of that.

Fix the problem by making dock_notify() use acpi_device_enumerated()
to check the presence of the device instead of checking the return
value of acpi_bus_get_device().

Fixes: 202317a5 (ACPI / scan: Add acpi_device objects for all device nodes in the namespace)
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

Since acpi_device_hotplug() assumes that ACPI handles of device
objects passed to it will not become invalid while acpi_scan_lock
is being held, make acpiphp_disable_slot() acquire acpi_scan_lock,
because it generally causes _EJ0 to be executed for one of the
devices in the slot and that may cause its ACPI handle to become
invalid.
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

Pull SELinux fixes from James Morris.

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security:
  SELinux:  Fix kernel BUG on empty security contexts.
  selinux: add SOCK_DIAG_BY_FAMILY to the list of netlink message types

Pull vfs fixes from Al Viro:
 "A couple of fixes, both -stable fodder.  The O_SYNC bug is fairly
  old..."

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  fix a kmap leak in virtio_console
  fix O_SYNC|O_APPEND syncing the wrong range on write()

While we are at it, don't do kmap() under kmap_atomic(), *especially*
for a page we'd allocated with GFP_KERNEL.  It's spelled "page_address",
and had that been more than that, we'd have a real trouble - kmap_high()
can block, and doing that while holding kmap_atomic() is a Bad Idea(tm).
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

It actually goes back to 2004 ([PATCH] Concurrent O_SYNC write support)
when sync_page_range() had been introduced; generic_file_write{,v}() correctly
synced
	pos_after_write - written .. pos_after_write - 1
but generic_file_aio_write() synced
	pos_before_write .. pos_before_write + written - 1
instead.  Which is not the same thing with O_APPEND, obviously.
A couple of years later correct variant had been killed off when
everything switched to use of generic_file_aio_write().

All users of generic_file_aio_write() are affected, and the same bug
has been copied into other instances of ->aio_write().

The fix is trivial; the only subtle point is that generic_write_sync()
ought to be inlined to avoid calculations useless for the majority of
calls.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

Pull btrfs fixes from Chris Mason:
 "This is a small collection of fixes"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs:
  Btrfs: fix data corruption when reading/updating compressed extents
  Btrfs: don't loop forever if we can't run because of the tree mod log
  btrfs: reserve no transaction units in btrfs_ioctl_set_features
  btrfs: commit transaction after setting label and features
  Btrfs: fix assert screwup for the pending move stuff

Pull perf fixes from Ingo Molnar:
 "Tooling fixes, mostly related to the KASLR fallout, but also other
  fixes"

* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  perf buildid-cache: Check relocation when checking for existing kcore
  perf tools: Adjust kallsyms for relocated kernel
  perf tests: No need to set up ref_reloc_sym
  perf symbols: Prevent the use of kcore if the kernel has moved
  perf record: Get ref_reloc_sym from kernel map
  perf machine: Set up ref_reloc_sym in machine__create_kernel_maps()
  perf machine: Add machine__get_kallsyms_filename()
  perf tools: Add kallsyms__get_function_start()
  perf symbols: Fix symbol annotation for relocated kernel
  perf tools: Fix include for non x86 architectures
  perf tools: Fix AAAAARGH64 memory barriers
  perf tools: Demangle kernel and kernel module symbols too
  perf/doc: Remove mention of non-existent set_perf_event_pending() from design.txt

When using a mix of compressed file extents and prealloc extents, it
is possible to fill a page of a file with random, garbage data from
some unrelated previous use of the page, instead of a sequence of zeroes.

A simple sequence of steps to get into such case, taken from the test
case I made for xfstests, is:

   _scratch_mkfs
   _scratch_mount "-o compress-force=lzo"
   $XFS_IO_PROG -f -c "pwrite -S 0x06 -b 18670 266978 18670" $SCRATCH_MNT/foobar
   $XFS_IO_PROG -c "falloc 26450 665194" $SCRATCH_MNT/foobar
   $XFS_IO_PROG -c "truncate 542872" $SCRATCH_MNT/foobar
   $XFS_IO_PROG -c "fsync" $SCRATCH_MNT/foobar

This results in the following file items in the fs tree:

   item 4 key (257 INODE_ITEM 0) itemoff 15879 itemsize 160
       inode generation 6 transid 6 size 542872 block group 0 mode 100600
   item 5 key (257 INODE_REF 256) itemoff 15863 itemsize 16
       inode ref index 2 namelen 6 name: foobar
   item 6 key (257 EXTENT_DATA 0) itemoff 15810 itemsize 53
       extent data disk byte 0 nr 0 gen 6
       extent data offset 0 nr 24576 ram 266240
       extent compression 0
   item 7 key (257 EXTENT_DATA 24576) itemoff 15757 itemsize 53
       prealloc data disk byte 12849152 nr 241664 gen 6
       prealloc data offset 0 nr 241664
   item 8 key (257 EXTENT_DATA 266240) itemoff 15704 itemsize 53
       extent data disk byte 12845056 nr 4096 gen 6
       extent data offset 0 nr 20480 ram 20480
       extent compression 2
   item 9 key (257 EXTENT_DATA 286720) itemoff 15651 itemsize 53
       prealloc data disk byte 13090816 nr 405504 gen 6
       prealloc data offset 0 nr 258048

The on disk extent at offset 266240 (which corresponds to 1 single disk block),
contains 5 compressed chunks of file data. Each of the first 4 compress 4096
bytes of file data, while the last one only compresses 3024 bytes of file data.
Therefore a read into the file region [285648 ; 286720[ (length = 4096 - 3024 =
1072 bytes) should always return zeroes (our next extent is a prealloc one).

The solution here is the compression code path to zero the remaining (untouched)
bytes of the last page it uncompressed data into, as the information about how
much space the file data consumes in the last page is not known in the upper layer
fs/btrfs/extent_io.c:__do_readpage(). In __do_readpage we were correctly zeroing
the remainder of the page but only if it corresponds to the last page of the inode
and if the inode's size is not a multiple of the page size.

This would cause not only returning random data on reads, but also permanently
storing random data when updating parts of the region that should be zeroed.
For the example above, it means updating a single byte in the region [285648 ; 286720[
would store that byte correctly but also store random data on disk.

A test case for xfstests follows soon.
Signed-off-by: Filipe David Borba Manana <fdmanana@gmail.com>
Signed-off-by: Chris Mason <clm@fb.com>

A user reported a 100% cpu hang with my new delayed ref code.  Turns out I
forgot to increase the count check when we can't run a delayed ref because of
the tree mod log.  If we can't run any delayed refs during this there is no
point in continuing to look, and we need to break out.  Thanks,
Signed-off-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: Chris Mason <clm@fb.com>

Added in patch "btrfs: add ioctls to query/change feature bits online"
modifications to superblock don't need to reserve metadata blocks when
starting a transaction.
Signed-off-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <clm@fb.com>

The set_fslabel ioctl uses btrfs_end_transaction, which means it's
possible that the change will be lost if the system crashes, same for
the newly set features. Let's use btrfs_commit_transaction instead.
Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <clm@fb.com>

Wang noticed that he was failing btrfs/030 even though me and Filipe couldn't
reproduce.  Turns out this is because Wang didn't have CONFIG_BTRFS_ASSERT set,
which meant that a key part of Filipe's original patch was not being built in.
This appears to be a mess up with merging Filipe's patch as it does not exist in
his original patch.  Fix this by changing how we make sure del_waiting_dir_move
asserts that it did not error and take the function out of the ifdef check.
This makes btrfs/030 pass with the assert on or off.  Thanks,
Signed-off-by: Josef Bacik <jbacik@fb.com>
Reviewed-by: Filipe Manana <fdmanana@gmail.com>
Signed-off-by: Chris Mason <clm@fb.com>

Pull pinctrl fixes from Linus Walleij:
 "First round of pin control fixes for v3.14:

   - Protect pinctrl_list_add() with the proper mutex.  This was
     identified by RedHat.  Caused nasty locking warnings was rootcased
     by Stanislaw Gruszka.

   - Avoid adding dangerous debugfs files when either half of the
     subsystem is unused: pinmux or pinconf.

   - Various fixes to various drivers: locking, hardware particulars, DT
     parsing, error codes"

* tag 'pinctrl-v3.14-2' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl:
  pinctrl: tegra: return correct error type
  pinctrl: do not init debugfs entries for unimplemented functionalities
  pinctrl: protect pinctrl_list add
  pinctrl: sirf: correct the pin index of ac97_pins group
  pinctrl: imx27: fix offset calculation in imx_read_2bit
  pinctrl: vt8500: Change devicetree data parsing
  pinctrl: imx27: fix wrong offset to ICONFB
  pinctrl: at91: use locked variant of irq_set_handler

Pull irq fix from Thomas Gleixner:
 "Add a missing Kconfig dependency"

* 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  genirq: Generic irq chip requires IRQ_DOMAIN

Pull x86 fixes from Peter Anvin:
 "Quite a varied little collection of fixes.  Most of them are
  relatively small or isolated; the biggest one is Mel Gorman's fixes
  for TLB range flushing.

  A couple of AMD-related fixes (including not crashing when given an
  invalid microcode image) and fix a crash when compiled with gcov"

* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86, microcode, AMD: Unify valid container checks
  x86, hweight: Fix BUG when booting with CONFIG_GCOV_PROFILE_ALL=y
  x86/efi: Allow mapping BGRT on x86-32
  x86: Fix the initialization of physnode_map
  x86, cpu hotplug: Fix stack frame warning in check_irq_vectors_for_cpu_disable()
  x86/intel/mid: Fix X86_INTEL_MID dependencies
  arch/x86/mm/srat: Skip NUMA_NO_NODE while parsing SLIT
  mm, x86: Revisit tlb_flushall_shift tuning for page flushes except on IvyBridge
  x86: mm: change tlb_flushall_shift for IvyBridge
  x86/mm: Eliminate redundant page table walk during TLB range flushing
  x86/mm: Clean up inconsistencies when flushing TLB ranges
  mm, x86: Account for TLB flushes only when debugging
  x86/AMD/NB: Fix amd_set_subcaches() parameter type
  x86/quirks: Add workaround for AMD F16h Erratum792
  x86, doc, kconfig: Fix dud URL for Microcode data

Pull jfs fix from David Kleikamp:
 "Fix regression"

* tag 'jfs-3.14-rc2' of git://github.com/kleikamp/linux-shaggy:
  jfs: fix generic posix ACL regression

I missed a couple errors in reviewing the patches converting jfs
to use the generic posix ACL function. Setting ACL's currently
fails with -EOPNOTSUPP.
Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com>
Reported-by: Michael L. Semon <mlsemon35@gmail.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>

On archs like S390 or um this driver cannot build nor work.
Make it depend on HAS_IOMEM to bypass build failures.

drivers/built-in.o: In function `dw_wdt_drv_probe':
drivers/watchdog/dw_wdt.c:302: undefined reference to `devm_ioremap_resource'
Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

Merge tag 'driver-core-3.14-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core

Pull driver core fix from Greg KH:
 "Here is a single kernfs fix to resolve a much-reported lockdep issue
  with the removal of entries in sysfs"

* tag 'driver-core-3.14-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core:
  kernfs: make kernfs_deactivate() honor KERNFS_LOCKDEP flag

Pull ceph fixes from Sage Weil:
 "There is an RBD fix for a crash due to the immutable bio changes, an
  error path fix, and a locking fix in the recent redirect support"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client:
  libceph: do not dereference a NULL bio pointer
  libceph: take map_sem for read in handle_reply()
  libceph: factor out logic from ceph_osdc_start_request()
  libceph: fix error handling in ceph_osdc_init()

Pull arm64 fixes from Catalin Marinas:
 - Relax VDSO alignment requirements so that the kernel-picked one (4K)
   does not conflict with the dynamic linker's one (64K)
 - VDSO gettimeofday fix
 - Barrier fixes for atomic operations and cache flushing
 - TLB invalidation when overriding early page mappings during boot
 - Wired up new 32-bit arm (compat) syscalls
 - LSM_MMAP_MIN_ADDR when COMPAT is enabled
 - defconfig update
 - Clean-up (comments, pgd_alloc).

* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
  arm64: defconfig: Expand default enabled features
  arm64: asm: remove redundant "cc" clobbers
  arm64: atomics: fix use of acquire + release for full barrier semantics
  arm64: barriers: allow dsb macro to take option parameter
  security: select correct default LSM_MMAP_MIN_ADDR on arm on arm64
  arm64: compat: Wire up new AArch32 syscalls
  arm64: vdso: update wtm fields for CLOCK_MONOTONIC_COARSE
  arm64: vdso: fix coarse clock handling
  arm64: simplify pgd_alloc
  arm64: fix typo: s/SERRROR/SERROR/
  arm64: Invalidate the TLB when replacing pmd entries during boot
  arm64: Align CMA sizes to PAGE_SIZE
  arm64: add DSB after icache flush in __flush_icache_all()
  arm64: vdso: prevent ld from aligning PT_LOAD segments to 64k

Pull MIPS updates from Ralf Baechle:
 "hree minor patches.  All have sat in -next for a few days"

* 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus:
  MIPS: fpu.h: Fix build when CONFIG_BUG is not set
  MIPS: Wire up sched_setattr/sched_getattr syscalls
  MIPS: Alchemy: Fix DB1100 GPIO registration

Pull media fixes from Mauro Carvalho Chehab:
 "A series of small fixes.  Mostly driver ones.  There is one core
  regression fix on a patch that was meant to fix some race issues on
  vb2, but that actually caused more harm than good.  So, we're just
  reverting it for now"

* 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media:
  [media] adv7842: Composite free-run platfrom-data fix
  [media] v4l2-dv-timings: fix GTF calculation
  [media] hdpvr: Fix memory leak in debug
  [media] af9035: add ID [2040:f900] Hauppauge WinTV-MiniStick 2
  [media] mxl111sf: Fix compile when CONFIG_DVB_USB_MXL111SF is unset
  [media] mxl111sf: Fix unintentional garbage stack read
  [media] cx24117: use a valid dev pointer for dev_err printout
  [media] cx24117: remove dead code in always 'false' if statement
  [media] update Michael Krufky's email address
  [media] vb2: Check if there are buffers before streamon
  [media] Revert "[media] videobuf_vm_{open,close} race fixes"
  [media] go7007-loader: fix usb_dev leak
  [media] media: bt8xx: add missing put_device call
  [media] exynos4-is: Compile in fimc-lite runtime PM callbacks conditionally
  [media] exynos4-is: Compile in fimc runtime PM callbacks conditionally
  [media] exynos4-is: Fix error paths in probe() for !pm_runtime_enabled()
  [media] s5p-jpeg: Fix wrong NV12 format parameters
  [media] s5k5baf: allow to handle arbitrary long i2c sequences

Pull hwmon fixes from Guenter Roeck:
 "Fix PMBus driver problem with some multi-page voltage sensors and fix
  da9055 interrupt initialization"

* tag 'hwmon-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging:
  hwmon: (da9055) Remove use of regmap_irq_get_virq()
  hwmon: (pmbus) Support per-page exponent in linear mode