xen/gntalloc: fix oops after runnning out of grant refs

Only set gref->gref_id if foreign access was successfully granted and
the grant ref is valid.

If gref->gref_id == -ENOSPC the test in __del_gref() would incorrectly
attempt to end foreign access (because grant_ref_t is unsigned).

Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Reported-by: Dave Scott <dave.scott@citrix.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
xen/gntalloc: safely delete grefs in add_grefs() undo path

If a gref could not be added (perhaps because the limit has been
reached or there are no more grant references available), the undo
path may crash because __del_gref() frees the gref while it is being
used for a list iteration.

A comment suggests that using list_for_each_entry() is safe since the
gref isn't removed from the list being iterated over, but it is freed
and thus list_for_each_entry_safe() must be used.

Also, explicitly delete the gref from the local per-file list, even
though this is not strictly necessary.

Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
MAINTAINERS: Add Lucas Stach as co-maintainer for i.MX6 PCI driver

Also drop Shawn Guo per his request.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Shawn Guo <shawn.guo@freescale.com>
Acked-by: Richard Zhu <r65037@freescale.com>
Acked-by: Jingoo Han <jg1.han@samsung.com>
PCI: imx6: Put LTSSM in "Detect" state before disabling it

This fixes a boot hang observed when the bootloader already enabled the
PCIe link for its own use.  The fundamental problem is that Freescale
forgot to wire up the core reset, so software doesn't have a sane way to
get the core into a defined state.

According to the DW PCIe core reference manual, configuration of the core
may only happen when the LTSSM is disabled, so this is one of the first
things we need to do.  Apparently this isn't safe to do when the LTSSM is in
any state other than "detect" as we observe an instant machine hang when
trying to do so while the link is already up.

As a workaround, force LTSSM into detect state right before hitting the
disable switch.  There is still a race window because the LTSSM may
transition out of "detect" before we can disable it, but it's the best
we can do for now.

[bhelgaas: mention race window]
Link: http://lkml.kernel.org/r/1406830565-23450-3-git-send-email-l.stach@pengutronix.de
Reported-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Tim Harvey <tharvey@gateworks.com>
Merge tag 'usb-serial-3.17-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/johan/usb-serial into usb-linus

Johan writes:

USB-serial fixes for v3.17-rc4

These updates add back some PIDs that were lost in a recent revert and add a
couple of new ones. Included is also an update to how the sierra driver binds
its interfaces in order to avoid binding CDC interfaces.

Signed-off-by: Johan Hovold <johan@kernel.org>
[media] Kconfig: do not select SPI bus on sub-driver auto-select

We should not select SPI bus when sub-driver auto-select is
selected. That option is meant for auto-selecting all possible
ancillary drivers used for selected board driver. Ancillary
drivers should define needed dependencies itself.

I2C and I2C_MUX are still selected here for a reason described on
commit 347f7a3763601d7b466898d1f10080b7083ac4a3

Reverts commit e4462ffc1602d9df21c00a0381dca9080474e27a

Reported-by: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
[media] af9033: update IT9135 tuner inittabs

Update IT9135 BX tuner config 60 and 61 inittabs.

[crope@iki.fi: removed two reg writes from driver init itself]
Cc: <stable@vger.kernel.org> # v3.15+
Signed-off-by: Bimow Chen <Bimow.Chen@ite.com.tw>
Signed-off-by: Antti Palosaari <crope@iki.fi>

Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
[media] it913x: init tuner on attach

That register is needed to program very first in order to operate
correctly.

[crope@iki.fi: returned sequence back, removed sleep, moved reg
write earlier to prevent populating tuner ops in case of failure]

Cc: <stable@vger.kernel.org> # v3.15+
Signed-off-by: Bimow Chen <Bimow.Chen@ite.com.tw>
Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
[media] af9033: feed clock to RF tuner

IT9135 RF tuner clock is coming from demodulator. We need enable it
early in demod init, before any tuner I/O. Currently it is enabled
by tuner driver itself, but it is too late and performance will be
reduced as some registers are not updated correctly. Clock is
disabled automatically when demod is put onto sleep.

Cc: <stable@vger.kernel.org> # v3.15+
Cc: Bimow Chen <Bimow.Chen@ite.com.tw>
Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
[media] af9035: new IDs: add support for PCTV 78e and PCTV 79e

add the following IDs
USB_PID_PCTV_78E (0x025a) for PCTV 78e
USB_PID_PCTV_79E (0x0262) for PCTV 79e

For these it9135 devices.

Signed-off-by: Malcolm Priestley <tvboxspy@gmail.com>
Cc: Antti Palosaari <crope@iki.fi>
Cc: <stable@vger.kernel.org> # v3.14+
Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
Merge tag 'sound-3.17-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound

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
cgroup: delay the clearing of cgrp->kn->priv

Run these two scripts concurrently:

    for ((; ;))
    {
        mkdir /cgroup/sub
        rmdir /cgroup/sub
    }

    for ((; ;))
    {
        echo $$ > /cgroup/sub/cgroup.procs
        echo $$ > /cgroup/cgroup.procs
    }

A kernel bug will be triggered:

BUG: unable to handle kernel NULL pointer dereference at 00000038
IP: [<c10bbd69>] cgroup_put+0x9/0x80
...
Call Trace:
 [<c10bbe19>] cgroup_kn_unlock+0x39/0x50
 [<c10bbe91>] cgroup_kn_lock_live+0x61/0x70
 [<c10be3c1>] __cgroup_procs_write.isra.26+0x51/0x230
 [<c10be5b2>] cgroup_tasks_write+0x12/0x20
 [<c10bb7b0>] cgroup_file_write+0x40/0x130
 [<c11aee71>] kernfs_fop_write+0xd1/0x160
 [<c1148e58>] vfs_write+0x98/0x1e0
 [<c114934d>] SyS_write+0x4d/0xa0
 [<c16f656b>] sysenter_do_call+0x12/0x12

We clear cgrp->kn->priv in the end of cgroup_rmdir(), but another
concurrent thread can access kn->priv after the clearing.

We should move the clearing to css_release_work_fn(). At that time
no one is holding reference to the cgroup and no one can gain a new
reference to access it.

v2:
- move RCU_INIT_POINTER() into the else block. (Tejun)
- remove the cgroup_parent() check. (Tejun)
- update the comment in css_tryget_online_from_dir().

Cc: <stable@vger.kernel.org> # 3.15+
Reported-by: Toralf Förster <toralf.foerster@gmx.de>
Signed-off-by: Zefan Li <lizefan@huawei.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
cgroup: check cgroup liveliness before unbreaking kernfs

When cgroup_kn_lock_live() is called through some kernfs operation and
another thread is calling cgroup_rmdir(), we'll trigger the warning in
cgroup_get().

------------[ cut here ]------------
WARNING: CPU: 1 PID: 1228 at kernel/cgroup.c:1034 cgroup_get+0x89/0xa0()
...
Call Trace:
 [<c16ee73d>] dump_stack+0x41/0x52
 [<c10468ef>] warn_slowpath_common+0x7f/0xa0
 [<c104692d>] warn_slowpath_null+0x1d/0x20
 [<c10bb999>] cgroup_get+0x89/0xa0
 [<c10bbe58>] cgroup_kn_lock_live+0x28/0x70
 [<c10be3c1>] __cgroup_procs_write.isra.26+0x51/0x230
 [<c10be5b2>] cgroup_tasks_write+0x12/0x20
 [<c10bb7b0>] cgroup_file_write+0x40/0x130
 [<c11aee71>] kernfs_fop_write+0xd1/0x160
 [<c1148e58>] vfs_write+0x98/0x1e0
 [<c114934d>] SyS_write+0x4d/0xa0
 [<c16f656b>] sysenter_do_call+0x12/0x12
---[ end trace 6f2e0c38c2108a74 ]---

Fix this by calling css_tryget() instead of cgroup_get().

v2:
- move cgroup_tryget() right below cgroup_get() definition. (Tejun)

Cc: <stable@vger.kernel.org> # 3.15+
Reported-by: Toralf Förster <toralf.foerster@gmx.de>
Signed-off-by: Zefan Li <lizefan@huawei.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
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
Merge tag 'hwmon-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging

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 'mac80211-for-john-2014-08-29' of git://git.kernel.org/pub/scm/linux/kernel/git/jberg/mac80211

Johannes Berg <johannes@sipsolutions.net> says:

"Here are a few fixes for mac80211. One has been discussed for a while
and adds a terminating NUL-byte to the alpha2 sent to userspace, which
shouldn't be necessary but since many places treat it as a string we
couldn't move to just sending two bytes.

In addition to that, we have two VLAN fixes from Felix, a mesh fix, a
fix for the recently introduced RX aggregation offload, a revert for
a broken patch (that luckily didn't really cause any harm) and a small
fix for alignment in debugfs."

Signed-off-by: John W. Linville <linville@redhat.com>
Merge branch 'for-john' of git://git.kernel.org/pub/scm/linux/kernel/git/iwlwifi/iwlwifi-fixes
Revert "i2c: rcar: remove spinlock"

This reverts commit 150b8be3cda54412ad7b54f5392b513b25c0aaa7.

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>
spi: sirf: enable RX_IO_DMA_INT interrupt

in spi interrupt handler, we need check RX_IO_DMA status to ensure
rx fifo have received the specify count data.

if not set, the while statement in spi isr function will keep loop,
at last, make the kernel hang.

[The code is actually there in the interrupt handler but apparently it
needs the interrupt unmasking so the handler sees the status -- broonie]

Signed-off-by: Qipan Li <Qipan.Li@csr.com>
Signed-off-by: Barry Song <Baohua.Song@csr.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Cc: stable@vger.kernel.org
udf: Make udf_read_inode() and udf_iget() return error

Currently __udf_read_inode() wasn't returning anything and we found out
whether we succeeded reading inode by checking whether inode is bad or
not. udf_iget() returned NULL on failure and inode pointer otherwise.
Make these two functions properly propagate errors up the call stack and
use the return value in callers.

Signed-off-by: Jan Kara <jack@suse.cz>