KVM: s390: Fix user triggerable bug in dead code

commit 614a80e474b227cace52fd6e3c790554db8a396e upstream.

In the early days, we had some special handling for the
KVM_EXIT_S390_SIEIC exit, but this was gone in 2009 with commit
d7b0b5eb3000 (KVM: s390: Make psw available on all exits, not
just a subset).

Now this switch statement is just a sanity check for userspace
not messing with the kvm_run structure. Unfortunately, this
allows userspace to trigger a kernel BUG. Let's just remove
this switch statement.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
[lizf: Backported to 3.4:
 - adjust context
 - no KVM_EXIT_S390_TSCH and KVM_EXIT_DEBUG in 3.4]
Signed-off-by: Zefan Li <lizefan@huawei.com>
regmap: Fix handling of volatile registers for format_write() chips

commit 5844a8b9d98ec11ce1d77610daacf3f0a0e14715 upstream.

A previous over-zealous factorisation of code means that we only treat
registers as volatile if they are readable. For most devices this is fine
since normally most registers can be read and volatility implies
readability but for format_write() devices where there is no readback from
the hardware and we use volatility to mean simply uncacheability this means
that we end up treating all registers as cacheble.

A bigger refactoring of the code to clarify this is in order but as a fix
make a minimal change and only check readability when checking volatility
if there is no format_write() operation defined for the device.

Signed-off-by: Mark Brown <broonie@linaro.org>
Tested-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Zefan Li <lizefan@huawei.com>
drm/i915: Remove bogus __init annotation from DMI callbacks

commit bbe1c2740d3a25aa1dbe5d842d2ff09cddcdde0a upstream.

The __init annotations for the DMI callback functions are wrong as this
code can be called even after the module has been initialized, e.g. like
this:

  # echo 1 > /sys/bus/pci/devices/0000:00:02.0/remove
  # modprobe i915
  # echo 1 > /sys/bus/pci/rescan

The first command will remove the PCI device from the kernel's device
list so the second command won't see it right away. But as it registers
a PCI driver it'll see it on the third command. If the system happens to
match one of the DMI table entries we'll try to call a function in long
released memory and generate an Oops, at best.

Fix this by removing the bogus annotation.

Modpost should have caught that one but it ignores section reference
mismatches from the .rodata section. :/

Fixes: 25e341cfc33d ("drm/i915: quirk away broken OpRegion VBT")
Fixes: 8ca4013d702d ("CHROMIUM: i915: Add DMI override to skip CRT...")
Fixes: 425d244c8670 ("drm/i915: ignore LVDS on intel graphics systems...")
Signed-off-by: Mathias Krause <minipli@googlemail.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Duncan Laurie <dlaurie@chromium.org>
Cc: Jarod Wilson <jarod@redhat.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>	# Can modpost be fixed?
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Zefan Li <lizefan@huawei.com>
get rid of propagate_umount() mistakenly treating slaves as busy.

commit 88b368f27a094277143d8ecd5a056116f6a41520 upstream.

The check in __propagate_umount() ("has somebody explicitly mounted
something on that slave?") is done *before* taking the already doomed
victims out of the child lists.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
[lizf: Backported to 3.4:
 - adjust context
 - s/hlist_for_each_entry/list_for_each_entry/]
Signed-off-by: Zefan Li <lizefan@huawei.com>
drm/vmwgfx: Fix a potential infinite spin waiting for fifo idle

commit f01ea0c3d9db536c64d47922716d8b3b8f21d850 upstream.

The code waiting for fifo idle was incorrect and could possibly spin
forever under certain circumstances.

Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Reported-by: Mark Sheldon <markshel@vmware.com>
Reviewed-by: Jakob Bornecrantz <jakob@vmware.com>
Reivewed-by: Mark Sheldon <markshel@vmware.com>
Signed-off-by: Zefan Li <lizefan@huawei.com>
ALSA: hda - Fix COEF setups for ALC1150 codec

commit acf08081adb5e8fe0519eb97bb49797ef52614d6 upstream.

ALC1150 codec seems to need the COEF- and PLL-setups just like its
compatible ALC882 codec.  Some machines (e.g. SunMicro X10SAT) show
the problem like too low output volumes unless the COEF setup is
applied.

Reported-and-tested-by: Dana Goyette <danagoyette@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Zefan Li <lizefan@huawei.com>
ACPI / cpuidle: fix deadlock between cpuidle_lock and cpu_hotplug.lock

commit 6726655dfdd2dc60c035c690d9f10cb69d7ea075 upstream.

There is a following AB-BA dependency between cpu_hotplug.lock and
cpuidle_lock:

1) cpu_hotplug.lock -> cpuidle_lock
enable_nonboot_cpus()
 _cpu_up()
  cpu_hotplug_begin()
   LOCK(cpu_hotplug.lock)
 cpu_notify()
  ...
  acpi_processor_hotplug()
   cpuidle_pause_and_lock()
    LOCK(cpuidle_lock)

2) cpuidle_lock -> cpu_hotplug.lock
acpi_os_execute_deferred() workqueue
 ...
 acpi_processor_cst_has_changed()
  cpuidle_pause_and_lock()
   LOCK(cpuidle_lock)
  get_online_cpus()
   LOCK(cpu_hotplug.lock)

Fix this by reversing the order acpi_processor_cst_has_changed() does
thigs -- let it first execute the protection against CPU hotplug by
calling get_online_cpus() and obtain the cpuidle lock only after that (and
perform the symmentric change when allowing CPUs hotplug again and
dropping cpuidle lock).

Spotted by lockdep.

Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Zefan Li <lizefan@huawei.com>
regulatory: add NUL to alpha2

commit a5fe8e7695dc3f547e955ad2b662e3e72969e506 upstream.

alpha2 is defined as 2-chars array, but is used in multiple
places as string (e.g. with nla_put_string calls), which
might leak kernel data.

Solve it by simply adding an extra char for the NULL
terminator, making such operations safe.

Signed-off-by: Eliad Peller <eliadx.peller@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
[lizf: Backported to 3.4: adjust context]
Signed-off-by: Zefan Li <lizefan@huawei.com>
percpu: fix pcpu_alloc_pages() failure path

commit f0d279654dea22b7a6ad34b9334aee80cda62cde upstream.

When pcpu_alloc_pages() fails midway, pcpu_free_pages() is invoked to
free what has already been allocated.  The invocation is across the
whole requested range and pcpu_free_pages() will try to free all
non-NULL pages; unfortunately, this is incorrect as
pcpu_get_pages_and_bitmap(), unlike what its comment suggests, doesn't
clear the pages array and thus the array may have entries from the
previous invocations making the partial failure path free incorrect
pages.

Fix it by open-coding the partial freeing of the already allocated
pages.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Zefan Li <lizefan@huawei.com>
percpu: perform tlb flush after pcpu_map_pages() failure

commit 849f5169097e1ba35b90ac9df76b5bb6f9c0aabd upstream.

If pcpu_map_pages() fails midway, it unmaps the already mapped pages.
Currently, it doesn't flush tlb after the partial unmapping.  This may
be okay in most cases as the established mapping hasn't been used at
that point but it can go wrong and when it goes wrong it'd be
extremely difficult to track down.

Flush tlb after the partial unmapping.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Zefan Li <lizefan@huawei.com>
percpu: free percpu allocation info for uniprocessor system

commit 3189eddbcafcc4d827f7f19facbeddec4424eba8 upstream.

Currently, only SMP system free the percpu allocation info.
Uniprocessor system should free it too. For example, one x86 UML
virtual machine with 256MB memory, UML kernel wastes one page memory.

Signed-off-by: Honggang Li <enjoymindful@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Zefan Li <lizefan@huawei.com>
cgroup: reject cgroup names with ' '

commit 71b1fb5c4473a5b1e601d41b109bdfe001ec82e0 upstream.

/proc/<pid>/cgroup contains one cgroup path on each line. If cgroup names are
allowed to contain "\n", applications cannot parse /proc/<pid>/cgroup safely.

Signed-off-by: Alban Crequy <alban.crequy@collabora.co.uk>
Signed-off-by: Tejun Heo <tj@kernel.org>
[lizf: Backported to 3.4:
 - adjust context
 - s/name/dentry->d_name.name/]
Signed-off-by: Zefan Li <lizefan@huawei.com>
rtlwifi: rtl8192cu: Add new ID

commit c66517165610b911e4c6d268f28d8c640832dbd1 upstream.

The Sitecom WLA-2102 adapter uses this driver.

Reported-by: Nico Baggus <nico-linux@noci.xs4all.nl>
Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Cc: Nico Baggus <nico-linux@noci.xs4all.nl>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: Zefan Li <lizefan@huawei.com>
ahci: Add Device IDs for Intel 9 Series PCH

commit 1b071a0947dbce5c184c12262e02540fbc493457 upstream.

This patch adds the AHCI mode SATA Device IDs for the Intel 9 Series PCH.

Signed-off-by: James Ralston <james.d.ralston@intel.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Zefan Li <lizefan@huawei.com>
ata_piix: Add Device IDs for Intel 9 Series PCH

commit 6cad1376954e591c3c41500c4e586e183e7ffe6d upstream.

This patch adds the IDE mode SATA Device IDs for the Intel 9 Series PCH.

Signed-off-by: James Ralston <james.d.ralston@intel.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Zefan Li <lizefan@huawei.com>
USB: ftdi_sio: add support for NOVITUS Bono E thermal printer

commit ee444609dbae8afee420c3243ce4c5f442efb622 upstream.

Add device id for NOVITUS Bono E thermal printer.

Reported-by: Emanuel Koczwara <poczta@emanuelkoczwara.pl>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Zefan Li <lizefan@huawei.com>
USB: sierra: avoid CDC class functions on "68A3" devices

commit 049255f51644c1105775af228396d187402a5934 upstream.

Sierra Wireless Direct IP devices using the 68A3 product ID
can be configured for modes including a CDC ECM class function.
The known example uses interface numbers 12 and 13 for the ECM
control and data interfaces respectively, consistent with CDC
MBIM function interface numbering on other Sierra devices.

It seems cleaner to restrict this driver to the ff/ff/ff
vendor specific interfaces rather than increasing the already
long interface number blacklist.  This should be more future
proof if Sierra adds more class functions using interface
numbers not yet in the blacklist.

Signed-off-by: Bjørn Mork <bjorn@mork.no>
Signed-off-by: Johan Hovold <johan@kernel.org>
[lizf: Backported to 3.4: adjust context]
Signed-off-by: Zefan Li <lizefan@huawei.com>
USB: sierra: add 1199:68AA device ID

commit 5b3da69285c143b7ea76b3b9f73099ff1093ab73 upstream.

This VID:PID is used for some Direct IP devices behaving
identical to the already supported 0F3D:68AA devices.

Reported-by: Lars Melin <larsm17@gmail.com>
Signed-off-by: Bjørn Mork <bjorn@mork.no>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Zefan Li <lizefan@huawei.com>
xen/manage: Always freeze/thaw processes when suspend/resuming

commit 61a734d305e16944b42730ef582a7171dc733321 upstream.

Always freeze processes when suspending and thaw processes when resuming
to prevent a race noticeable with HVM guests.

This prevents a deadlock where the khubd kthread (which is designed to
be freezable) acquires a usb device lock and then tries to allocate
memory which requires the disk which hasn't been resumed yet.
Meanwhile, the xenwatch thread deadlocks waiting for the usb device
lock.

Freezing processes fixes this because the khubd thread is only thawed
after the xenwatch thread finishes resuming all the devices.

Signed-off-by: Ross Lagerwall <ross.lagerwall@citrix.com>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
[lizf: Backported to 3.4: adjust context]
Signed-off-by: Zefan Li <lizefan@huawei.com>
block: Fix dev_t minor allocation lifetime

commit 2da78092dda13f1efd26edbbf99a567776913750 upstream.

Releases the dev_t minor when all references are closed to prevent
another device from acquiring the same major/minor.

Since the partition's release may be invoked from call_rcu's soft-irq
context, the ext_dev_idr's mutex had to be replaced with a spinlock so
as not so sleep.

Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
[lizf: Backported to 3.4:
 - adjust context
 - remove idr_preload() and idr_preload_end()]
Signed-off-by: Zefan Li <lizefan@huawei.com>