This CL supports two power_supply_property items for smart battery:
POWER_SUPPLY_PROP_MANUFACTURER and POWER_SUPPLY_PROP_MODEL_NAME such
that battery information 'manufacturer' and 'model_name' can be exported
to sysfs.
Signed-off-by: Cheng-Yi Chiang <cychiang@chromium.org>
Reviewed-by: Olof Johansson <olofj@chromium.org>
Signed-off-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
Signed-off-by: Sebastian Reichel <sre@kernel.org>

Pull i2c bugfixes from Wolfram Sang:
 "I2C driver bugfixes for the 3.17 release.  Details can be found in the
  commit messages, yet I think this is typical driver stuff"

* 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux:
  Revert "i2c: rcar: remove spinlock"
  i2c: at91: add bound checking on SMBus block length bytes
  i2c: rk3x: fix bug that cause transfer fails in master receive mode
  i2c: at91: Fix a race condition during signal handling in at91_do_twi_xfer.
  i2c: mv64xxx: continue probe when clock-frequency is missing
  i2c: rcar: fix MNR interrupt handling

Pull m68k updates from Geert Uytterhoeven:
 "Wire up new syscalls getrandom and memfd_create"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/geert/linux-m68k:
  m68k: Wire up memfd_create
  m68k: Wire up getrandom

Dave Hansen reports a massive scalability regression in an uncontained
page fault benchmark with more than 30 concurrent threads, which he
bisected down to 05b84301 ("mm: memcontrol: use root_mem_cgroup
res_counter") and pin-pointed on res_counter spinlock contention.

That change relied on the per-cpu charge caches to mostly swallow the
res_counter costs, but it's apparent that the caches don't scale yet.

Revert memcg back to bypassing res_counters on the root level in order
to restore performance for uncontained workloads.
Reported-by: Dave Hansen <dave@sr71.net>
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Tested-by: Dave Hansen <dave.hansen@intel.com>
Acked-by: Michal Hocko <mhocko@suse.cz>
Acked-by: Vladimir Davydov <vdavydov@parallels.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

This patch changes sync_filesystem() to be EXPORT_SYMBOL().

The reason this is needed is that starting with 3.15 kernel, due to
Theodore Ts'o's commit 02b9984d ("fs: push sync_filesystem() down to
the file system's remount_fs()"), all file systems that have dirty data
to be written out need to call sync_filesystem() from their
->remount_fs() method when remounting read-only.

As this is now a generically required function rather than an internal
only function it should be EXPORT_SYMBOL() so that all file systems can
call it.
Signed-off-by: Anton Altaparmakov <aia21@cantab.net>
Acked-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Pull regulator documentation fixes from Mark Brown:
 "All the fixes people have found for the regulator API have been
  documentation fixes, avoiding warnings while building the kerneldoc,
  fixing some errors in one of the DT bindings documents and fixing some
  typos in the header"

* tag 'regulator-v3.17-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regulator:
  regulator: fix kernel-doc warnings in header files
  regulator: Proofread documentation
  regulator: tps65090: Fix tps65090 typos in example

Pull GPIO fixes from Linus Walleij:
 - some documentation sync
 - resource leak in the bt8xx driver
 - again fix the way varargs are used to handle the optional flags on
   the gpiod_* accessors.  Now hopefully nailed the entire problem.

* tag 'gpio-v3.17-3' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio:
  gpio: move varargs hack outside #ifdef GPIOLIB
  gpio: bt8xx: fix release of managed resources
  Documentation: gpio: documentation for optional getters functions

Pull drm fixes from Dave Airlie:
 - i915 fixes: a few display regressions
 - vmwgfx: possible loop forever fix
 - nouveau: one userspace interface fix

* 'drm-fixes' of git://people.freedesktop.org/~airlied/linux:
  drm/nouveau/core: don't leak oclass type bits to user
  drm/i915: Fix lock dropping in intel_tv_detect()
  drm/i915: handle G45/GM45 pulse detection connected state.
  drm/vmwgfx: Fix a potential infinite spin waiting for fifo idle
  drm/vmwgfx: Fix an incorrect OOM return value
  drm/i915: Remove bogus __init annotation from DMI callbacks
  drm/i915: don't warn if backlight unexpectedly enabled
  drm/i915: Move intel_ddi_set_vc_payload_alloc(false) to haswell_crtc_disable()
  drm/i915: fix plane/cursor handling when runtime suspended
  drm/i915: Ignore VBT backlight presence check on Acer C720 (4005U)

Merge remote-tracking branches 'regulator/fix/doc' and 'regulator/fix/tps65090' into regulator-linus

single fix for nouveau.

* 'linux-3.17' of git://anongit.freedesktop.org/git/nouveau/linux-2.6:
  drm/nouveau/core: don't leak oclass type bits to user

Fixes not being able to init fence subsystem when multiple boards are
present.
Reported-by: Ilia Mirkin <imirkin@alum.mit.edu>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

Pull aio bugfixes from Ben LaHaise:
 "Two small fixes"

* git://git.kvack.org/~bcrl/aio-fixes:
  aio: block exit_aio() until all context requests are completed
  aio: add missing smp_rmb() in read_events_ring

It seems that exit_aio() also needs to wait for all iocbs to complete (like
io_destroy), but we missed the wait step in current implemention, so fix
it in the same way as we did in io_destroy.
Signed-off-by: Gu Zheng <guz.fnst@cn.fujitsu.com>
Signed-off-by: Benjamin LaHaise <bcrl@kvack.org>
Cc: stable@vger.kernel.org

This reverts commit 150b8be3.

The I2C core's per-adapter locks can't protect from IRQs, so the driver still
needs a spinlock to protect the register accesses.
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Cc: stable@vger.kernel.org # 3.16+
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

Pull hwmon bugfix from Guenter Roeck:
 "Fix a bug in the ds1621 driver"

* tag 'hwmon-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging:
  hwmon: (ds1621) Update zbits after conversion rate change

Merge tag 'platform-drivers-x86-v3.17-1' of git://git.infradead.org/users/dvhart/linux-platform-drivers-x86

Pull x86 platform drivers fixes from Darren Hart:
 "This is my first pull request since taking on maintenance for the
  platform-drivers-x86 tree from Matthew Garrett.  These have passed my
  build testing and been run through Fengguang's LKP tests.  Due to
  timing this round, these have not spent any time in linux-next.  I
  have asked Stephen to include my for-next branch in linux-next going
  forward, once he's back from vacation.

  Details from tag:

   - toshiba_acpi: re-enable hotkeys and cleanups
   - ideapad-laptop: revert touchpad disable, and cleanup static/const
     usage
   - MAINTAINERS: update platform-drivers-x86 maintainer and tree"

* tag 'platform-drivers-x86-v3.17-1' of git://git.infradead.org/users/dvhart/linux-platform-drivers-x86:
  toshiba_acpi: fix and cleanup toshiba_kbd_bl_mode_store()
  platform/x86: toshiba: re-enable acpi hotkeys after suspend to disk
  ideapad-laptop: Constify DMI table for real!
  Revert "ideapad-laptop: Disable touchpad interface on Yoga models"
  MAINTAINERS: Update platform-drivers-x86 maintainer and tree

Pull sound fixes from Takashi Iwai:
 "This time it contains a bunch of small ASoC fixes that slipped from in
  previous updates, in addition to the usual HD-audio fixes and the
  regression fixes for FireWire updates in 3.17.

  All commits are reasonably small fixes"

* tag 'sound-3.17-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound:
  ALSA: hda - Fix COEF setups for ALC1150 codec
  ASoC: simple-card: Fix bug of wrong decrement DT node's refcount
  ALSA: hda - Fix digital mic on Acer Aspire 3830TG
  ASoC: omap-twl4030: Fix typo in 2nd dai link's platform_name
  ALSA: firewire-lib/dice: add arrangements of PCM pointer and interrupts for Dice quirk
  ALSA: dice: fix wrong channel mappping at higher sampling rate
  ASoC: cs4265: Fix setting of functional mode and clock divider
  ASoC: cs4265: Fix clock rates in clock map table
  ASoC: rt5677: correct mismatch widget name
  ASoC: rt5640: Do not allow regmap to use bulk read-write operations
  ASoC: tegra: Fix typo in include guard
  ASoC: da732x: Fix typo in include guard
  ASoC: core: fix .info for SND_SOC_BYTES_TLV
  ASoC: rcar: Use && instead of & for boolean expressions
  ASoC: Use dev_set_name() instead of init_name
  ASoC: axi: Fix ADI AXI SPDIF specification

here's a couple of display regression fixes for 3.17.

* tag 'drm-intel-fixes-2014-09-03' of git://anongit.freedesktop.org/drm-intel:
  drm/i915: Fix lock dropping in intel_tv_detect()
  drm/i915: handle G45/GM45 pulse detection connected state.

Pull input subsystem updates from Dmitry Torokhov:
 "A fix for MT breakage, enhancement to Elantech PS/2 driver and a
  couple of assorted fixes"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input:
  Input: elantech - add support for trackpoint found on some v3 models
  Input: elantech - reset the device when elantech probe fails
  Input: ALPS - suppress message about 'Unknown touchpad'
  Input: fix used slots detection breakage
  Input: sparc - i8042-sparcio.h: fix unused kbd_res warning
  Input: atmel_mxt_ts - improve description of gpio-keymap property

Pull regmap fixes from Mark Brown:
 "Several bug fixes for issues that have been lurking for a while:

   - Check that devices haven't set the flag saying they only support
     register at a time operation while we're doing cache syncs,
     otherwise we fail to restore caches

   - Ensure that we don't mark all registers on devices using
     format_write() as cacheable, avoiding adding a cache of things like
     reset registers which we don't want to rewrite during cache sync

   - Make sure we create the debugfs files in the correct directory"

* tag 'regmap-v3.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap:
  regmap: Don't attempt block writes when syncing cache on single_rw devices
  regmap: Fix handling of volatile registers for format_write() chips
  regmap: Fix regcache debugfs initialization

The current code just returns -EINVAL because mode can't be equal to
both 1 and 2.

Also this function is messy so I have cleaned it up:
1) Remove initializers like "int time = -1".  Initializing variables to
   garbage values turns off GCC's uninitialized variable warnings so it
   can lead to bugs.
2) Use kstrtoint() instead of sscanf().
3) Use SCI_KBD_MODE_FNZ and SCI_KBD_MODE_AUTO instead of magic numbers 1
   and 2.
4) Don't check for "mode == -1" because that can't happen.
5) Preserve the error code from toshiba_kbd_illum_status_set().
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Darren Hart <dvhart@linux.intel.com>

Pull f2fs bug fixes from Jaegeuk Kim:
 "This series includes patches to:

   - fix recovery routines
   - fix bugs related to inline_data/xattr
   - fix when casting the dentry names
   - handle EIO or ENOMEM correctly
   - fix memory leak
   - fix lock coverage"

* tag 'for-f2fs-3.17-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs: (28 commits)
  f2fs: reposition unlock_new_inode to prevent accessing invalid inode
  f2fs: fix wrong casting for dentry name
  f2fs: simplify by using a literal
  f2fs: truncate stale block for inline_data
  f2fs: use macro for code readability
  f2fs: introduce need_do_checkpoint for readability
  f2fs: fix incorrect calculation with total/free inode num
  f2fs: remove rename and use rename2
  f2fs: skip if inline_data was converted already
  f2fs: remove rewrite_node_page
  f2fs: avoid double lock in truncate_blocks
  f2fs: prevent checkpoint during roll-forward
  f2fs: add WARN_ON in f2fs_bug_on
  f2fs: handle EIO not to break fs consistency
  f2fs: check s_dirty under cp_mutex
  f2fs: unlock_page when node page is redirtied out
  f2fs: introduce f2fs_cp_error for readability
  f2fs: give a chance to mount again when encountering errors
  f2fs: trigger release_dirty_inode in f2fs_put_super
  f2fs: don't skip checkpoint if there is no dirty node pages
  ...

Pull key subsystem fixes from James Morris:
 "Fixes for the keys subsystem, one of which addresses a use-after-free
  bug"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security:
  PEFILE: Relax the check on the length of the PKCS#7 cert
  KEYS: Fix use-after-free in assoc_array_gc()
  KEYS: Fix public_key asymmetric key subtype name
  KEYS: Increase root_maxkeys and root_maxbytes sizes

Structure name and variable name were erroneously interchanged
Signed-off-by: Noam Camus <noamc@ezchip.com>
Acked-by: Vineet Gupta <vgupta@synopsys.com>
[ Also removed pointless cast from "void *".  - Linus ]
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Pull more arm64 fixes from Will Deacon:
 "Another handful of arm64 fixes here.  They address some issues found
  by running smatch on the arch code (ignoring the false positives) and
  also stop 32-bit Android from losing track of its stack.

  There's one additional irq migration fix in the pipeline, but it came
  in after I'd tagged and tested this set.

   - a few fixes for real issues found by smatch (after Dan's talk at KS)

   - revert the /proc/cpuinfo changes merged during the merge window.
     We've opened a can of worms here, so we need to find out where we
     stand before we change this interface.

   - implement KSTK_ESP for compat tasks, otherwise 32-bit Android gets
     confused wondering where its [stack] has gone

   - misc fixes (fpsimd context handling, crypto, ...)"

* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
  Revert "arm64: cpuinfo: print info for all CPUs"
  arm64: fix bug for reloading FPSIMD state after cpu power off
  arm64: report correct stack pointer in KSTK_ESP for compat tasks
  arm64: Add brackets around user_stack_pointer()
  arm64: perf: don't rely on layout of pt_regs when grabbing sp or pc
  arm64: ptrace: fix compat reg getter/setter return values
  arm64: ptrace: fix compat hardware watchpoint reporting
  arm64: Remove unused variable in head.S
  arm64/crypto: remove redundant update of data

Pull PCI fix from Bjorn Helgaas:
 "This fixes an ARM allmodconfig build problem:

  Remove module option for ST Microelectronics SPEAr13xx"

* tag 'pci-v3.17-fixes-1' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci:
  PCI: spear: Remove module option

Merge branch 'leds-fixes-for-3.17' of git://git.kernel.org/pub/scm/linux/kernel/git/cooloney/linux-leds

Pull LED fix from Bryan Wu:
 "Hugh, Jiri and many other people found a kernel oops due to a LED
  change merged recently.  Now the right fix might just revert it and
  avoid the kernel oops"

* 'leds-fixes-for-3.17' of git://git.kernel.org/pub/scm/linux/kernel/git/cooloney/linux-leds:
  Revert "leds: convert blink timer to workqueue"

Merge tag 'asoc-v3.17-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound into for-linus

ASoC: Fixes for v3.17

A few more driver specific fixes on top of the currently pending fixes
(which are already in your tree but not Linus').

Two vmwgfx fixes, marked for stable as well

* 'vmwgfx-fixes-3.17' of git://people.freedesktop.org/~thomash/linux:
  drm/vmwgfx: Fix a potential infinite spin waiting for fifo idle
  drm/vmwgfx: Fix an incorrect OOM return value

Relax the check on the length of the PKCS#7 cert as it appears that the PE
file wrapper size gets rounded up to the nearest 8.

The debugging output looks like this:

	PEFILE: ==> verify_pefile_signature()
	PEFILE: ==> pefile_parse_binary()
	PEFILE: checksum @ 110
	PEFILE: header size = 200
	PEFILE: cert = 968 @547be0 [68 09 00 00 00 02 02 00 30 82 09 56 ]
	PEFILE: sig wrapper = { 968, 200, 2 }
	PEFILE: Signature data not PKCS#7

The wrapper is the first 8 bytes of the hex dump inside [].  This indicates a
length of 0x968 bytes, including the wrapper header - so 0x960 bytes of
payload.

The ASN.1 wrapper begins [ ... 30 82 09 56 ].  That indicates an object of size
0x956 - a four byte discrepency, presumably just padding for alignment
purposes.

So we just check that the ASN.1 container is no bigger than the payload and
reduce the recorded size appropriately.

Whilst we're at it, allow shorter PKCS#7 objects that manage to squeeze within
127 or 255 bytes.  It's just about conceivable if no X.509 certs are included
in the PKCS#7 message.
Reported-by: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Vivek Goyal <vgoyal@redhat.com>
Acked-by: Peter Jones <pjones@redhat.com>
Signed-off-by: James Morris <james.l.morris@oracle.com>

An edit script should be considered inaccessible by a function once it has
called assoc_array_apply_edit() or assoc_array_cancel_edit().

However, assoc_array_gc() is accessing the edit script just after the
gc_complete: label.
Reported-by: Andreea-Cristina Bernat <bernat.ada@gmail.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: Andreea-Cristina Bernat <bernat.ada@gmail.com>
cc: shemming@brocade.com
cc: paulmck@linux.vnet.ibm.com
Cc: stable@vger.kernel.org
Signed-off-by: James Morris <james.l.morris@oracle.com>

The length of the name of an asymmetric key subtype must be stored in struct
asymmetric_key_subtype::name_len so that it can be matched by a search for
"<subkey_name>:<partial_fingerprint>".  Fix the public_key subtype to have
name_len set.
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: James Morris <james.l.morris@oracle.com>

Now that NFS client uses the kernel key ring facility to store the NFSv4
id/gid mappings, the defaults for root_maxkeys and root_maxbytes need to be
substantially increased.

These values have been soak tested:

	https://bugzilla.redhat.com/show_bug.cgi?id=1033708#c73Signed-off-by: Steve Dickson <steved@redhat.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: James Morris <james.l.morris@oracle.com>

On the Toshiba Tecra Z40, after a suspend-to-disk, some FN hotkeys
driven by toshiba_acpi are not functional.

Calling the ACPI object ENAB on resume makes them back alive.
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Acked-by: Matthew Garrett <matthew.garrett@nebula.com>
Signed-off-by: Darren Hart <dvhart@linux.intel.com>

Merge remote-tracking branches 'asoc/fix/axi', 'asoc/fix/cs4265', 'asoc/fix/da732x', 'asoc/fix/omap', 'asoc/fix/rsnd', 'asoc/fix/rt5640', 'asoc/fix/rt5677', 'asoc/fix/simple' and 'asoc/fix/tegra' into asoc-linus

This is a follow-up patch to commit 49458e83 ("ideapad-laptop:
Constify DMI table and other r/o variables") to do what its commit
message says. The actual commit differs from the patch posted at
https://www.mail-archive.com/platform-driver-x86@vger.kernel.org/msg05340.html
significantly, probably due to a bad merge conflict resolution. Fix up
the mess and constify the DMI table for real and fix the bogus
double-const of ideapad_rfk_data[].
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Mathias Krause <minipli@googlemail.com>
Cc: Matthew Garrett <matthew.garrett@nebula.com>
Cc: Ike Panhc <ike.pan@canonical.com>
Signed-off-by: Darren Hart <dvhart@linux.intel.com>

We ran into a case on ppc64 running mariadb where io_getevents would
return zeroed out I/O events.  After adding instrumentation, it became
clear that there was some missing synchronization between reading the
tail pointer and the events themselves.  This small patch fixes the
problem in testing.

Thanks to Zach for helping to look into this, and suggesting the fix.
Signed-off-by: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Benjamin LaHaise <bcrl@kvack.org>
Cc: stable@vger.kernel.org

This reverts commit 8b37e1be.

It's broken as it changes led_blink_set() in a way that it can now sleep
(while synchronously waiting for workqueue to be cancelled). That's a
problem, because it's possible that this function gets called from atomic
context (tpt_trig_timer() takes a readlock and thus disables preemption).

This has been brought up 3 weeks ago already [1] but no proper fix has
materialized, and I keep seeing the problem since 3.17-rc1.

[1] https://lkml.org/lkml/2014/8/16/128

 BUG: sleeping function called from invalid context at kernel/workqueue.c:2650
 in_atomic(): 1, irqs_disabled(): 0, pid: 2335, name: wpa_supplicant
 5 locks held by wpa_supplicant/2335:
  #0:  (rtnl_mutex){+.+.+.}, at: [<ffffffff814c7c92>] rtnl_lock+0x12/0x20
  #1:  (&wdev->mtx){+.+.+.}, at: [<ffffffffc06e649c>] cfg80211_mgd_wext_siwessid+0x5c/0x180 [cfg80211]
  #2:  (&local->mtx){+.+.+.}, at: [<ffffffffc0817dea>] ieee80211_prep_connection+0x17a/0x9a0 [mac80211]
  #3:  (&local->chanctx_mtx){+.+.+.}, at: [<ffffffffc08081ed>] ieee80211_vif_use_channel+0x5d/0x2a0 [mac80211]
  #4:  (&trig->leddev_list_lock){.+.+..}, at: [<ffffffffc081e68c>] tpt_trig_timer+0xec/0x170 [mac80211]
 CPU: 0 PID: 2335 Comm: wpa_supplicant Not tainted 3.17.0-rc3 #1
 Hardware name: LENOVO 7470BN2/7470BN2, BIOS 6DET38WW (2.02 ) 12/19/2008
  ffff8800360b5a50 ffff8800751f76d8 ffffffff8159e97f ffff8800360b5a30
  ffff8800751f76e8 ffffffff810739a5 ffff8800751f77b0 ffffffff8106862f
  ffffffff810685d0 0aa2209200000000 ffff880000000004 ffff8800361c59d0
 Call Trace:
  [<ffffffff8159e97f>] dump_stack+0x4d/0x66
  [<ffffffff810739a5>] __might_sleep+0xe5/0x120
  [<ffffffff8106862f>] flush_work+0x5f/0x270
  [<ffffffff810685d0>] ? mod_delayed_work_on+0x80/0x80
  [<ffffffff810945ca>] ? mark_held_locks+0x6a/0x90
  [<ffffffff81068a5f>] ? __cancel_work_timer+0x6f/0x100
  [<ffffffff810946ed>] ? trace_hardirqs_on_caller+0xfd/0x1c0
  [<ffffffff81068a6b>] __cancel_work_timer+0x7b/0x100
  [<ffffffff81068b0e>] cancel_delayed_work_sync+0xe/0x10
  [<ffffffff8147cf3b>] led_blink_set+0x1b/0x40
  [<ffffffffc081e6b0>] tpt_trig_timer+0x110/0x170 [mac80211]
  [<ffffffffc081ecdd>] ieee80211_mod_tpt_led_trig+0x9d/0x160 [mac80211]
  [<ffffffffc07e4278>] __ieee80211_recalc_idle+0x98/0x140 [mac80211]
  [<ffffffffc07e59ce>] ieee80211_idle_off+0xe/0x10 [mac80211]
  [<ffffffffc0804e5b>] ieee80211_add_chanctx+0x3b/0x220 [mac80211]
  [<ffffffffc08062e4>] ieee80211_new_chanctx+0x44/0xf0 [mac80211]
  [<ffffffffc080838a>] ieee80211_vif_use_channel+0x1fa/0x2a0 [mac80211]
  [<ffffffffc0817df8>] ieee80211_prep_connection+0x188/0x9a0 [mac80211]
  [<ffffffffc081c246>] ieee80211_mgd_auth+0x256/0x2e0 [mac80211]
  [<ffffffffc07eab33>] ieee80211_auth+0x13/0x20 [mac80211]
  [<ffffffffc06cb006>] cfg80211_mlme_auth+0x106/0x270 [cfg80211]
  [<ffffffffc06ce085>] cfg80211_conn_do_work+0x155/0x3b0 [cfg80211]
  [<ffffffffc06cf670>] cfg80211_connect+0x3f0/0x540 [cfg80211]
  [<ffffffffc06e6148>] cfg80211_mgd_wext_connect+0x158/0x1f0 [cfg80211]
  [<ffffffffc06e651e>] cfg80211_mgd_wext_siwessid+0xde/0x180 [cfg80211]
  [<ffffffffc06e36c0>] ? cfg80211_wext_giwessid+0x50/0x50 [cfg80211]
  [<ffffffffc06e36dd>] cfg80211_wext_siwessid+0x1d/0x40 [cfg80211]
  [<ffffffff81584d0c>] ioctl_standard_iw_point+0x14c/0x3e0
  [<ffffffff810946ed>] ? trace_hardirqs_on_caller+0xfd/0x1c0
  [<ffffffff8158502a>] ioctl_standard_call+0x8a/0xd0
  [<ffffffff81584fa0>] ? ioctl_standard_iw_point+0x3e0/0x3e0
  [<ffffffff81584b76>] wireless_process_ioctl.constprop.10+0xb6/0x100
  [<ffffffff8158521d>] wext_handle_ioctl+0x5d/0xb0
  [<ffffffff814cfb29>] dev_ioctl+0x329/0x620
  [<ffffffff810946ed>] ? trace_hardirqs_on_caller+0xfd/0x1c0
  [<ffffffff8149c7f2>] sock_ioctl+0x142/0x2e0
  [<ffffffff811b0140>] do_vfs_ioctl+0x300/0x520
  [<ffffffff815a67fb>] ? sysret_check+0x1b/0x56
  [<ffffffff810946ed>] ? trace_hardirqs_on_caller+0xfd/0x1c0
  [<ffffffff811b03e1>] SyS_ioctl+0x81/0xa0
  [<ffffffff815a67d6>] system_call_fastpath+0x1a/0x1f
 wlan0: send auth to 00:0b:6b:3c:8c:e4 (try 1/3)
 wlan0: authenticated
 wlan0: associate with 00:0b:6b:3c:8c:e4 (try 1/3)
 wlan0: RX AssocResp from 00:0b:6b:3c:8c:e4 (capab=0x431 status=0 aid=2)
 wlan0: associated
 IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
 cfg80211: Calling CRDA for country: NA
 wlan0: Limiting TX power to 27 (27 - 0) dBm as advertised by 00:0b:6b:3c:8c:e4

 =================================
 [ INFO: inconsistent lock state ]
 3.17.0-rc3 #1 Not tainted
 ---------------------------------
 inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage.
 swapper/0/0 [HC0[0]:SC1[1]:HE1:SE0] takes:
  ((&(&led_cdev->blink_work)->work)){+.?...}, at: [<ffffffff810685d0>] flush_work+0x0/0x270
 {SOFTIRQ-ON-W} state was registered at:
   [<ffffffff81094dbe>] __lock_acquire+0x30e/0x1a30
   [<ffffffff81096c81>] lock_acquire+0x91/0x110
   [<ffffffff81068608>] flush_work+0x38/0x270
   [<ffffffff81068a6b>] __cancel_work_timer+0x7b/0x100
   [<ffffffff81068b0e>] cancel_delayed_work_sync+0xe/0x10
   [<ffffffff8147cf3b>] led_blink_set+0x1b/0x40
   [<ffffffffc081e6b0>] tpt_trig_timer+0x110/0x170 [mac80211]
   [<ffffffffc081ecdd>] ieee80211_mod_tpt_led_trig+0x9d/0x160 [mac80211]
   [<ffffffffc07e4278>] __ieee80211_recalc_idle+0x98/0x140 [mac80211]
   [<ffffffffc07e59ce>] ieee80211_idle_off+0xe/0x10 [mac80211]
   [<ffffffffc0804e5b>] ieee80211_add_chanctx+0x3b/0x220 [mac80211]
   [<ffffffffc08062e4>] ieee80211_new_chanctx+0x44/0xf0 [mac80211]
   [<ffffffffc080838a>] ieee80211_vif_use_channel+0x1fa/0x2a0 [mac80211]
   [<ffffffffc0817df8>] ieee80211_prep_connection+0x188/0x9a0 [mac80211]
   [<ffffffffc081c246>] ieee80211_mgd_auth+0x256/0x2e0 [mac80211]
   [<ffffffffc07eab33>] ieee80211_auth+0x13/0x20 [mac80211]
   [<ffffffffc06cb006>] cfg80211_mlme_auth+0x106/0x270 [cfg80211]
   [<ffffffffc06ce085>] cfg80211_conn_do_work+0x155/0x3b0 [cfg80211]
   [<ffffffffc06cf670>] cfg80211_connect+0x3f0/0x540 [cfg80211]
   [<ffffffffc06e6148>] cfg80211_mgd_wext_connect+0x158/0x1f0 [cfg80211]
   [<ffffffffc06e651e>] cfg80211_mgd_wext_siwessid+0xde/0x180 [cfg80211]
   [<ffffffffc06e36dd>] cfg80211_wext_siwessid+0x1d/0x40 [cfg80211]
   [<ffffffff81584d0c>] ioctl_standard_iw_point+0x14c/0x3e0
   [<ffffffff8158502a>] ioctl_standard_call+0x8a/0xd0
   [<ffffffff81584b76>] wireless_process_ioctl.constprop.10+0xb6/0x100
   [<ffffffff8158521d>] wext_handle_ioctl+0x5d/0xb0
   [<ffffffff814cfb29>] dev_ioctl+0x329/0x620
   [<ffffffff8149c7f2>] sock_ioctl+0x142/0x2e0
   [<ffffffff811b0140>] do_vfs_ioctl+0x300/0x520
   [<ffffffff811b03e1>] SyS_ioctl+0x81/0xa0
   [<ffffffff815a67d6>] system_call_fastpath+0x1a/0x1f
 irq event stamp: 493416
 hardirqs last  enabled at (493416): [<ffffffff81068a5f>] __cancel_work_timer+0x6f/0x100
 hardirqs last disabled at (493415): [<ffffffff81067e9f>] try_to_grab_pending+0x1f/0x160
 softirqs last  enabled at (493408): [<ffffffff81053ced>] _local_bh_enable+0x1d/0x50
 softirqs last disabled at (493409): [<ffffffff81054c75>] irq_exit+0xa5/0xb0

 other info that might help us debug this:
  Possible unsafe locking scenario:

        CPU0
        ----
   lock((&(&led_cdev->blink_work)->work));
   <Interrupt>
     lock((&(&led_cdev->blink_work)->work));

  *** DEADLOCK ***

 2 locks held by swapper/0/0:
  #0:  (((&tpt_trig->timer))){+.-...}, at: [<ffffffff810b4c50>] call_timer_fn+0x0/0x180
  #1:  (&trig->leddev_list_lock){.+.?..}, at: [<ffffffffc081e68c>] tpt_trig_timer+0xec/0x170 [mac80211]

 stack backtrace:
 CPU: 0 PID: 0 Comm: swapper/0 Not tainted 3.17.0-rc3 #1
 Hardware name: LENOVO 7470BN2/7470BN2, BIOS 6DET38WW (2.02 ) 12/19/2008
  ffffffff8246eb30 ffff88007c203b00 ffffffff8159e97f ffffffff81a194c0
  ffff88007c203b50 ffffffff81599c29 0000000000000001 ffffffff00000001
  ffff880000000000 0000000000000006 ffffffff81a194c0 ffffffff81093ad0
 Call Trace:
  <IRQ>  [<ffffffff8159e97f>] dump_stack+0x4d/0x66
  [<ffffffff81599c29>] print_usage_bug+0x1f4/0x205
  [<ffffffff81093ad0>] ? check_usage_backwards+0x140/0x140
  [<ffffffff810944d3>] mark_lock+0x223/0x2b0
  [<ffffffff81094d60>] __lock_acquire+0x2b0/0x1a30
  [<ffffffff81096c81>] lock_acquire+0x91/0x110
  [<ffffffff810685d0>] ? mod_delayed_work_on+0x80/0x80
  [<ffffffffc081e5a0>] ? __ieee80211_get_rx_led_name+0x10/0x10 [mac80211]
  [<ffffffff81068608>] flush_work+0x38/0x270
  [<ffffffff810685d0>] ? mod_delayed_work_on+0x80/0x80
  [<ffffffff810945ca>] ? mark_held_locks+0x6a/0x90
  [<ffffffff81068a5f>] ? __cancel_work_timer+0x6f/0x100
  [<ffffffffc081e5a0>] ? __ieee80211_get_rx_led_name+0x10/0x10 [mac80211]
  [<ffffffff8109469d>] ? trace_hardirqs_on_caller+0xad/0x1c0
  [<ffffffffc081e5a0>] ? __ieee80211_get_rx_led_name+0x10/0x10 [mac80211]
  [<ffffffff81068a6b>] __cancel_work_timer+0x7b/0x100
  [<ffffffff81068b0e>] cancel_delayed_work_sync+0xe/0x10
  [<ffffffff8147cf3b>] led_blink_set+0x1b/0x40
  [<ffffffffc081e6b0>] tpt_trig_timer+0x110/0x170 [mac80211]
  [<ffffffff810b4cc5>] call_timer_fn+0x75/0x180
  [<ffffffff810b4c50>] ? process_timeout+0x10/0x10
  [<ffffffffc081e5a0>] ? __ieee80211_get_rx_led_name+0x10/0x10 [mac80211]
  [<ffffffff810b50ac>] run_timer_softirq+0x1fc/0x2f0
  [<ffffffff81054805>] __do_softirq+0x115/0x2e0
  [<ffffffff81054c75>] irq_exit+0xa5/0xb0
  [<ffffffff810049b3>] do_IRQ+0x53/0xf0
  [<ffffffff815a74af>] common_interrupt+0x6f/0x6f
  <EOI>  [<ffffffff8147b56e>] ? cpuidle_enter_state+0x6e/0x180
  [<ffffffff8147b732>] cpuidle_enter+0x12/0x20
  [<ffffffff8108bba0>] cpu_startup_entry+0x330/0x360
  [<ffffffff8158fb51>] rest_init+0xc1/0xd0
  [<ffffffff8158fa90>] ? csum_partial_copy_generic+0x170/0x170
  [<ffffffff81af3ff2>] start_kernel+0x44f/0x45a
  [<ffffffff81af399c>] ? set_init_arg+0x53/0x53
  [<ffffffff81af35ad>] x86_64_start_reservations+0x2a/0x2c
  [<ffffffff81af36a0>] x86_64_start_kernel+0xf1/0xf4

Cc: Vincent Donnefort <vdonnefort@gmail.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Bryan Wu <cooloney@gmail.com>

The driver was not bound checking the received length byte to ensure it was within the
the buffer size that is allocated for SMBus blocks. This resulted in buffer overflows
whenever an invalid length byte was received.
It also failed to ensure the length byte was not zero. If it received zero, it would end up
in an infinite loop as the at91_twi_read_next_byte function returned immediately without
allowing RHR to be read to clear the RXRDY interrupt.

Tested agaisnt a SMBus compliant battery.
Signed-off-by: Marek Roszko <mark.roszko@gmail.com>
Acked-by: Ludovic Desroches <ludovic.desroches@atmel.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Cc: stable@kernel.org