If we detect another vCPU is running we just exit and return 0 as if we
succesfully created the VGIC, but the VGIC wouldn't actual be created.
This shouldn't break in-kernel behavior because the kernel will not
observe the failed the attempt to create the VGIC, but userspace could
be rightfully confused.
Cc: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
When running on a system with a GICv3, we currenly don't allow the guest
to access the system register interface of the GICv3. We do this by
clearing the ICC_SRE_EL2.Enable, which causes all guest accesses to
ICC_SRE_EL1 to trap to EL2 and causes all guest accesses to other ICC_
registers to cause an undefined exception in the guest.
However, we currently don't handle the trap of guest accesses to
ICC_SRE_EL1 and will spill out a warning. The trap just needs to handle
the access as RAZ/WI, and a guest that tries to prod this register and
set ICC_SRE_EL1.SRE=1, must read back the value (which Linux already
does) to see if it succeeded, and will thus observe that ICC_SRE_EL1.SRE
was not set.
Add the simple trap handler in the sorted table of the system registers.
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
[ardb: added cp15 handling]
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Pull nfsd bugfixes from Bruce Fields:
"These fix one mishandling of the case when security labels are
configured out, and two races in the 4.1 backchannel code"
* 'for-3.18' of git://linux-nfs.org/~bfields/linux:
nfsd: Fix slot wake up race in the nfsv4.1 callback code
SUNRPC: Fix locking around callback channel reply receive
nfsd: correctly define v4.2 support attributes
Pull aio fix from Ben LaHaise:
"Dirty page accounting fix for aio"
* git://git.kvack.org/~bcrl/aio-fixes:
aio: fix uncorrent dirty pages accouting when truncating AIO ring buffer
Pull powerpc fixes from Ben Herrenschmidt:
"This series fix a nasty issue with radeon adapters on powerpc servers,
it's all CC'ed stable and has the relevant maintainers ack's/reviews.
Basically, some (radeon) adapters have issues with MSI addresses above
1T (only support 40-bits). We had powerpc specific quirk but it only
listed a specific revision of an adapter that we shipped with our
machines and didn't properly handle the audio function which some
distros enable nowadays.
So we made the quirk generic and fixed both the graphic and audio
drivers properly to use it.
Without that, ppc64 server machines will crash at boot with a radeon
adapter.
Note: This has been brewing for a while, it just needed a last respin
which got delayed due to us moving ozlabs to a new location in town
and other such things taking priority"
* 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc:
powerpc/pci: Remove unused force_32bit_msi quirk
powerpc/pseries: Honor the generic "no_64bit_msi" flag
powerpc/powernv: Honor the generic "no_64bit_msi" flag
sound/radeon: Move 64-bit MSI quirk from arch to driver
gpu/radeon: Set flag to indicate broken 64-bit MSI
PCI/MSI: Add device flag indicating that 64-bit MSIs don't work
ALSA: hda - Limit 40bit DMA for AMD HDMI controllers
single fix in one of the basic clock templates. No fixes to the core
this time around. As with most clock driver fixes these run the gamut
from fixing a build warning to fixing wrecked memory timings, with a
little USB tossed in for fun. Please consider pulling.
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1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=4O2k
-----END PGP SIGNATURE-----
Merge tag 'clk-fixes-for-linus' of https://git.linaro.org/people/mike.turquette/linux
Pull clock fixes from Mike Turquette:
"The fixes for the clock framework are all regressions in drivers, plus
a single fix in one of the basic clock templates. No fixes to the
core this time around.
As with most clock driver fixes these run the gamut from fixing a
build warning to fixing wrecked memory timings, with a little USB
tossed in for fun"
* tag 'clk-fixes-for-linus' of https://git.linaro.org/people/mike.turquette/linux:
clk: pxa: fix pxa27x CCCR bit usage
clk-divider: Fix READ_ONLY when divider > 1
clk: qcom: Fix duplicate rbcpr clock name
clk: at91: usb: fix at91sam9x5 recalc, round and set rate
clk: at91: usb: fix at91rm9200 round and set rate
This is now fully replaced with the generic "no_64bit_msi" one
that is set by the respective drivers directly.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Instead of the arch specific quirk which we are deprecating
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
CC: <stable@vger.kernel.org>
Instead of the arch specific quirk which we are deprecating
and that drivers don't understand.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
CC: <stable@vger.kernel.org>
A number of radeon cards have a HW limitation causing them to be
unable to generate the full 64-bit of address bits for MSIs. This
breaks MSIs on some platforms such as POWER machines.
We used to have a powerpc specific quirk to address that on a
single card, but this doesn't scale very well, this is better
put under control of the drivers who know precisely what a given
HW revision can do.
We now have a generic quirk in the PCI code. We should set it
appropriately for all radeon's from the audio driver.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Reviewed-by: Takashi Iwai <tiwai@suse.de>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
CC: <stable@vger.kernel.org>
Some radeon ASICs don't support all 64 address bits of MSIs despite
advertising support for 64-bit MSIs in their configuration space.
This breaks on systems such as IBM POWER7/8, where 64-bit MSIs can
be assigned with some of the high address bits set.
This makes use of the newly introduced "no_64bit_msi" flag in structure
pci_dev to allow the MSI allocation code to fallback to 32-bit MSIs
on those adapters.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
CC: <stable@vger.kernel.org>
---
Adding Alex's review tag. Patch to the driver is identical to the
reviewed one, I dropped the arch/powerpc hunk rewrote the subject
and cset comment.
This can be set by quirks/drivers to be used by the architecture code
that assigns the MSI addresses.
We additionally add verification in the core MSI code that the values
assigned by the architecture do satisfy the limitation in order to fail
gracefully if they don't (ie. the arch hasn't been updated to deal with
that quirk yet).
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
CC: <stable@vger.kernel.org>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
AMD/ATI HDMI controller chip models, we already have a filter to lower
to 32bit DMA, but the rest are supposed to be working with 64bit
although the hardware doesn't really work with 63bit but only with 40
or 48bit DMA. In this patch, we take 40bit DMA for safety for the
AMD/ATI controllers as the graphics drivers does.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
CC: <stable@vger.kernel.org>
x86 call do_notify_resume on paranoid returns if TIF_UPROBE is set but
not on non-paranoid returns. I suspect that this is a mistake and that
the code only works because int3 is paranoid.
Setting _TIF_NOTIFY_RESUME in the uprobe code was probably a workaround
for the x86 bug. With that bug fixed, we can remove _TIF_NOTIFY_RESUME
from the uprobes code.
Reported-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Acked-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Andy Lutomirski <luto@amacapital.net>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Chris bisected a NULL pointer deference in task_sched_runtime() to
commit 6e998916df 'sched/cputime: Fix clock_nanosleep()/clock_gettime()
inconsistency'.
Chris observed crashes in atop or other /proc walking programs when he
started fork bombs on his machine. He assumed that this is a new exit
race, but that does not make any sense when looking at that commit.
What's interesting is that, the commit provides update_curr callbacks
for all scheduling classes except stop_task and idle_task.
While nothing can ever hit that via the clock_nanosleep() and
clock_gettime() interfaces, which have been the target of the commit in
question, the author obviously forgot that there are other code paths
which invoke task_sched_runtime()
do_task_stat(()
thread_group_cputime_adjusted()
thread_group_cputime()
task_cputime()
task_sched_runtime()
if (task_current(rq, p) && task_on_rq_queued(p)) {
update_rq_clock(rq);
up->sched_class->update_curr(rq);
}
If the stats are read for a stomp machine task, aka 'migration/N' and
that task is current on its cpu, this will happily call the NULL pointer
of stop_task->update_curr. Ooops.
Chris observation that this happens faster when he runs the fork bomb
makes sense as the fork bomb will kick migration threads more often so
the probability to hit the issue will increase.
Add the missing update_curr callbacks to the scheduler classes stop_task
and idle_task. While idle tasks cannot be monitored via /proc we have
other means to hit the idle case.
Fixes: 6e998916df 'sched/cputime: Fix clock_nanosleep()/clock_gettime() inconsistency'
Reported-by: Chris Mason <clm@fb.com>
Reported-and-tested-by: Borislav Petkov <bp@alien8.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Stanislaw Gruszka <sgruszka@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Merge x86-64 iret fixes from Andy Lutomirski:
"This addresses the following issues:
- an unrecoverable double-fault triggerable with modify_ldt.
- invalid stack usage in espfix64 failed IRET recovery from IST
context.
- invalid stack usage in non-espfix64 failed IRET recovery from IST
context.
It also makes a good but IMO scary change: non-espfix64 failed IRET
will now report the correct error. Hopefully nothing depended on the
old incorrect behavior, but maybe Wine will get confused in some
obscure corner case"
* emailed patches from Andy Lutomirski <luto@amacapital.net>:
x86_64, traps: Rework bad_iret
x86_64, traps: Stop using IST for #SS
x86_64, traps: Fix the espfix64 #DF fixup and rewrite it in C
It's possible for iretq to userspace to fail. This can happen because
of a bad CS, SS, or RIP.
Historically, we've handled it by fixing up an exception from iretq to
land at bad_iret, which pretends that the failed iret frame was really
the hardware part of #GP(0) from userspace. To make this work, there's
an extra fixup to fudge the gs base into a usable state.
This is suboptimal because it loses the original exception. It's also
buggy because there's no guarantee that we were on the kernel stack to
begin with. For example, if the failing iret happened on return from an
NMI, then we'll end up executing general_protection on the NMI stack.
This is bad for several reasons, the most immediate of which is that
general_protection, as a non-paranoid idtentry, will try to deliver
signals and/or schedule from the wrong stack.
This patch throws out bad_iret entirely. As a replacement, it augments
the existing swapgs fudge into a full-blown iret fixup, mostly written
in C. It's should be clearer and more correct.
Signed-off-by: Andy Lutomirski <luto@amacapital.net>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Cc: stable@vger.kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
On a 32-bit kernel, this has no effect, since there are no IST stacks.
On a 64-bit kernel, #SS can only happen in user code, on a failed iret
to user space, a canonical violation on access via RSP or RBP, or a
genuine stack segment violation in 32-bit kernel code. The first two
cases don't need IST, and the latter two cases are unlikely fatal bugs,
and promoting them to double faults would be fine.
This fixes a bug in which the espfix64 code mishandles a stack segment
violation.
This saves 4k of memory per CPU and a tiny bit of code.
Signed-off-by: Andy Lutomirski <luto@amacapital.net>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Cc: stable@vger.kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
There's nothing special enough about the espfix64 double fault fixup to
justify writing it in assembly. Move it to C.
This also fixes a bug: if the double fault came from an IST stack, the
old asm code would return to a partially uninitialized stack frame.
Fixes: 3891a04aaf
Signed-off-by: Andy Lutomirski <luto@amacapital.net>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Cc: stable@vger.kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
A collection of fixes this week:
- A set of clock fixes for shmobile platforms
- A fix for tegra that moves serial port labels to be per board.
We're choosing to merge this for 3.18 because the labels will start
being parsed in 3.19, and without this change serial port numbers that
used to be stable since the dawn of time will change numbers.
- A few other DT tweaks for Tegra.
- A fix for multi_v7_defconfig that makes it stop spewing cpufreq errors on
Arndale (Exynos).
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1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=FXz0
-----END PGP SIGNATURE-----
Merge tag 'armsoc-for-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
Pull ARM SoC fixes from Olof Johansson:
"A collection of fixes this week:
- A set of clock fixes for shmobile platforms
- A fix for tegra that moves serial port labels to be per board.
We're choosing to merge this for 3.18 because the labels will start
being parsed in 3.19, and without this change serial port numbers
that used to be stable since the dawn of time will change numbers.
- A few other DT tweaks for Tegra.
- A fix for multi_v7_defconfig that makes it stop spewing cpufreq
errors on Arndale (Exynos)"
* tag 'armsoc-for-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc:
ARM: multi_v7_defconfig: fix failure setting CPU voltage by enabling dependent I2C controller
ARM: tegra: roth: Fix SD card VDD_IO regulator
ARM: tegra: Remove eMMC vmmc property for roth/tn7
ARM: dts: tegra: move serial aliases to per-board
ARM: tegra: Add serial port labels to Tegra124 DT
ARM: shmobile: kzm9g legacy: Set i2c clks_per_count to 2
ARM: shmobile: r8a7740 dtsi: Correct IIC0 parent clock
ARM: shmobile: r8a7790: Fix SD3CKCR address to device tree
ARM: shmobile: r8a7740 legacy: Correct IIC0 parent clock
ARM: shmobile: r8a7740 legacy: Add missing INTCA clock for irqpin module
ARM: shmobile: r8a7790: Fix SD3CKCR address
ARM: dts: sun6i: Re-parent ahb1_mux to pll6 as required by dma controller
Pull percpu fix from Tejun Heo:
"This contains one patch to fix a race condition which can lead to
percpu_ref using a percpu pointer which is corrupted with a set DEAD
bit. The bug was introduced while separating out the ATOMIC mode flag
from the DEAD flag. The fix is pretty straight forward.
I just committed the patch to the percpu tree but am sending out the
pull request early as I'll be on vacation for a week. The patch
should be fairly safe and while the latency will be higher I'll be
checking emails"
* 'for-3.18-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu:
percpu-ref: fix DEAD flag contamination of percpu pointer
Pull btrfs deadlock fix from Chris Mason:
"This has a fix for a long standing deadlock that we've been trying to
nail down for a while. It ended up being a bad interaction with the
fair reader/writer locks and the order btrfs reacquires locks in the
btree"
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs:
btrfs: fix lockups from btrfs_clear_path_blocking
While decoupling ATOMIC and DEAD flags, f47ad45784 ("percpu_ref:
decouple switching to percpu mode and reinit") updated
__ref_is_percpu() so that it only tests ATOMIC flag to determine
whether the ref is in percpu mode or not; however, while DEAD implies
ATOMIC, the two flags are set separately during percpu_ref_kill() and
if __ref_is_percpu() races percpu_ref_kill(), it may see DEAD w/o
ATOMIC. Because __ref_is_percpu() returns @ref->percpu_count_ptr
value verbatim as the percpu pointer after testing ATOMIC, the pointer
may now be contaminated with the DEAD flag.
This can be fixed by clearing the flag bits before returning the
pointer which was the fix proposed by Shaohua; however, as DEAD
implies ATOMIC, we can just test for both flags at once and avoid the
explicit masking.
Update __ref_is_percpu() so that it tests that both ATOMIC and DEAD
are clear before returning @ref->percpu_count_ptr as the percpu
pointer.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-and-Reviewed-by: Shaohua Li <shli@kernel.org>
Link: http://lkml.kernel.org/r/995deb699f5b873c45d667df4add3b06f73c2c25.1416638887.git.shli@kernel.org
Fixes: f47ad45784 ("percpu_ref: decouple switching to percpu mode and reinit")
Pull timer fix from Thomas Gleixner:
"A single bugfix for an init order problem in the sun4i subarch
clockevents code"
* 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
clockevent: sun4i: Fix race condition in the probe code
Pull vfs fixes from Al Viro:
"Assorted fixes, most in overlayfs land"
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
ovl: ovl_dir_fsync() cleanup
ovl: update MAINTAINERS
ovl: pass dentry into ovl_dir_read_merged()
ovl: use lockless_dereference() for upperdentry
ovl: allow filenames with comma
ovl: fix race in private xattr checks
ovl: fix remove/copy-up race
ovl: rename filesystem type to "overlay"
isofs: avoid unused function warning
vfs: fix reference leak in d_prune_aliases()
Pull networking fixes from David Miller:
1) Fix BUG when decrypting empty packets in mac80211, from Ronald Wahl.
2) nf_nat_range is not fully initialized and this is copied back to
userspace, from Daniel Borkmann.
3) Fix read past end of b uffer in netfilter ipset, also from Dan
Carpenter.
4) Signed integer overflow in ipv4 address mask creation helper
inet_make_mask(), from Vincent BENAYOUN.
5) VXLAN, be2net, mlx4_en, and qlcnic need ->ndo_gso_check() methods to
properly describe the device's capabilities, from Joe Stringer.
6) Fix memory leaks and checksum miscalculations in openvswitch, from
Pravin B SHelar and Jesse Gross.
7) FIB rules passes back ambiguous error code for unreachable routes,
making behavior confusing for userspace. Fix from Panu Matilainen.
8) ieee802154fake_probe() doesn't release resources properly on error,
from Alexey Khoroshilov.
9) Fix skb_over_panic in add_grhead(), from Daniel Borkmann.
10) Fix access of stale slave pointers in bonding code, from Nikolay
Aleksandrov.
11) Fix stack info leak in PPP pptp code, from Mathias Krause.
12) Cure locking bug in IPX stack, from Jiri Bohac.
13) Revert SKB fclone memory freeing optimization that is racey and can
allow accesses to freed up memory, from Eric Dumazet.
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (71 commits)
tcp: Restore RFC5961-compliant behavior for SYN packets
net: Revert "net: avoid one atomic operation in skb_clone()"
virtio-net: validate features during probe
cxgb4 : Fix DCB priority groups being returned in wrong order
ipx: fix locking regression in ipx_sendmsg and ipx_recvmsg
openvswitch: Don't validate IPv6 label masks.
pptp: fix stack info leak in pptp_getname()
brcmfmac: don't include linux/unaligned/access_ok.h
cxgb4i : Don't block unload/cxgb4 unload when remote closes TCP connection
ipv6: delete protocol and unregister rtnetlink when cleanup
net/mlx4_en: Add VXLAN ndo calls to the PF net device ops too
bonding: fix curr_active_slave/carrier with loadbalance arp monitoring
mac80211: minstrel_ht: fix a crash in rate sorting
vxlan: Inline vxlan_gso_check().
can: m_can: update to support CAN FD features
can: m_can: fix incorrect error messages
can: m_can: add missing delay after setting CCCR_INIT bit
can: m_can: fix not set can_dlc for remote frame
can: m_can: fix possible sleep in napi poll
can: m_can: add missing message RAM initialization
...
Pull drm fixes from Dave Airlie:
"Just two radeon and two intel fixes: endian and regression fixes"
* 'drm-fixes' of git://people.freedesktop.org/~airlied/linux:
drm/radeon: fix endian swapping in vbios fetch for tdp table
drm/radeon: disable native backlight control on pre-r6xx asics (v2)
drm/i915: Kick fbdev before vgacon
drm/i915: drop WaSetupGtModeTdRowDispatch:snb
This batch ended up as a relatively high volume due to pending
ASoC fixes. But most of fixes there are trivial and/or device-
specific fixes and quirks, so safe to apply. The only (ASoC)
core fixes are the DPCM race fix and the machine-driver matching
fix for componentization.
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v2
iQIcBAABAgAGBQJUbMUBAAoJEGwxgFQ9KSmkM7MQALi2oHeu089YX0nl2aJr/LeU
R55yuOCiKmkvikJIccInWbtwAW57K41CbLK9lDZx+6iSfpzAs7Nd554VdACDhtP1
wnnBGKhUZHF3NMim8UMjXRX/IAwJS1DvTKfULdLyAdG+ptNrmeCA2xBVPSCU+5Fb
q6QPSuM0A5qP//Ufsi4gHJsTZpe/S42PIh46XK5Z2nOO7Y/J+Ytwi/g6TaauYjDU
GZK3XNa7vjtZIw42nNyjn8qIIByhji591uHJpizIPVjbVKxhqm3wM1lU5xCYj/cd
fi1uWOOQ1Gp+DYTScfu0DZj1BaoBCqeQ27pvnDU15+yqDJHmmKvtQbBbETtbba9t
ajZvg+1J6ONf/wYkNqaSAkSFEMyOQ1NpSRsGMri28ahndkC72h6NBmH5FFEwIg1X
3XcxEf1BKw3oQXvaoeL8Qin6d+zWBjWHzNSmVeft4MYMf+AxnoXoD0+HmRIGQhVK
qFFtcuPVnIDHLUHsiVTNvMi7kejzgl8NUW3lGzbaWSSPKdUFHK2lE60uKzvQ5yHm
0K4CD2H4FVrMM3iqwSsDmUDk+++HOr7LjvC9jMZM5KobZQ9t25Imkt+ZdypQfzJC
wKz480viZcu3VimEdHYNivM2RLh2kxZtUB26O8DodEI28wr6b4PYlX/4Nzt+rXwu
YMf3SOUNdPEoAqlcEi9l
=oc6T
-----END PGP SIGNATURE-----
Merge tag 'sound-3.18-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound
Pull sound fixes from Takashi Iwai:
"This batch ended up as a relatively high volume due to pending ASoC
fixes. But most of fixes there are trivial and/or device- specific
fixes and quirks, so safe to apply. The only (ASoC) core fixes are
the DPCM race fix and the machine-driver matching fix for
componentization"
* tag 'sound-3.18-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound:
ALSA: hda - fix the mic mute led problem for Latitude E5550
ALSA: hda - move DELL_WMI_MIC_MUTE_LED to the tail in the quirk chain
ASoC: wm_adsp: Avoid attempt to free buffers that might still be in use
ALSA: usb-audio: Set the Control Selector to SU_SELECTOR_CONTROL for UAC2
ALSA: usb-audio: Add ctrl message delay quirk for Marantz/Denon devices
ASoC: sgtl5000: Fix SMALL_POP bit definition
ASoC: cs42l51: re-hook of_match_table pointer
ASoC: rt5670: change dapm routes of PLL connection
ASoC: rt5670: correct the incorrect default values
ASoC: samsung: Add MODULE_DEVICE_TABLE for Snow
ASoC: max98090: Correct pclk divisor settings
ASoC: dpcm: Fix race between FE/BE updates and trigger
ASoC: Fix snd_soc_find_dai() matching component by name
ASoC: rsnd: remove unsupported PAUSE flag
ASoC: fsi: remove unsupported PAUSE flag
ASoC: rt5645: Mark RT5645_TDM_CTRL_3 as readable
ASoC: rockchip-i2s: fix infinite loop in rockchip_snd_rxctrl
ASoC: es8328-i2c: Fix i2c_device_id name field in es8328_id
ASoC: fsl_asrc: Add reg_defaults for regmap to fix kernel dump
This is just a one-liner fixing a regression introduced in 3.13 that
broke system suspend on some Chromebooks.
On those machines there are ACPI device objects for some I2C devices
that can wake up the system from sleep states, but that is done via
a platform-specific mechanism and the ACPI objects don't contain any
wakeup-related information. When we started to use ACPI power
management with those devices (which happened during the 3.13 cycle),
their configuration confused the ACPI PM layer that returned error
codes from suspend callbacks for them causing system suspend to fail.
However, the ACPI PM layer can safely ignore the wakeup setting from
a device driver if the ACPI object corresponding to the device in
question doesn't contain wakeup information in which case the driver
itself is responsible for setting up the device for system wakeup.
/
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v2.0.22 (GNU/Linux)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=2pxa
-----END PGP SIGNATURE-----
Merge tag 'pm+acpi-3.18-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
Pull ACPI power management fix from Rafael Wysocki:
"This is just a one-liner fixing a regression introduced in 3.13 that
broke system suspend on some Chromebooks.
On those machines there are ACPI device objects for some I2C devices
that can wake up the system from sleep states, but that is done via a
platform-specific mechanism and the ACPI objects don't contain any
wakeup-related information. When we started to use ACPI power
management with those devices (which happened during the 3.13 cycle),
their configuration confused the ACPI PM layer that returned error
codes from suspend callbacks for them causing system suspend to fail.
However, the ACPI PM layer can safely ignore the wakeup setting from a
device driver if the ACPI object corresponding to the device in
question doesn't contain wakeup information in which case the driver
itself is responsible for setting up the device for system wakeup"
* tag 'pm+acpi-3.18-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
ACPI / PM: Ignore wakeup setting if the ACPI companion can't wake up
- 2 fixes for OF selftest code
- Fix for PowerPC address parsing to disable work-around except on old
PowerMACs
- Fix a crash when earlycon is enabled, but no device is found
- DT documentation fixes and missing vendor prefixes
All but the doc updates are also for stable.
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1
iQEcBAABAgAGBQJUbqAVAAoJEMhvYp4jgsXiNLUH/A5cpNKcs2D0GCpDxxkZa6X/
o5vwuECwd7dFH83lkFWdNFCNJ6B7hUUG3RDO63SgzZch2auQR1yETJrXSbUNeDKM
HMp3CVvVjqFz7h86H2x+mijxUPJl7YWtFuC1RQUJkMGULC16BnYLSVGrrqHI37BJ
E5hdmfJtARUGcmZO291JB9bdfuR5gAfIR4GIYsAQHn0RbiuST/L1DyL2QFkh69eW
yyeB9elIw+xYBUlEVMkq5LmH12l0VA1eSIofBWEfj40cCax1CblL1nzV1+s7oHpv
JrATuyfxlTjs/tdUeeV/lMT4Vg/ICWsbPJKWb4UaJv0nH+u+oGiKSCyl5X4DH4c=
=M65+
-----END PGP SIGNATURE-----
Merge tag 'devicetree-fixes-for-3.18' of git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux
Pull devicetree fixes from Rob Herring:
"DeviceTree fixes for 3.18:
- two fixes for OF selftest code
- fix for PowerPC address parsing to disable work-around except on
old PowerMACs
- fix a crash when earlycon is enabled, but no device is found
- DT documentation fixes and missing vendor prefixes
All but the doc updates are also for stable"
* tag 'devicetree-fixes-for-3.18' of git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux:
of/selftest: Fix testing when /aliases is missing
of/selftest: Fix off-by-one error in removal path
documentation: pinctrl bindings: Fix trivial typo 'abitrary'
devicetree: bindings: Add vendor prefix for Micron Technology, Inc.
of: Add vendor prefix for Chips&Media, Inc.
of/base: Fix PowerPC address parsing hack
devicetree: vendor-prefixes.txt: fix whitespace
of: Fix crash if an earlycon driver is not found
of/irq: Drop obsolete 'interrupts' vs 'interrupts-extended' text
of: Spelling s/stucture/structure/
devicetree: bindings: add sandisk to the vendor prefixes
Resource management
- Support 64-bit bridge windows if we have 64-bit dma_addr_t (Yinghai Lu)
PCI device hotplug
- Apply _HPX Link Control settings to all devices with a link (Yinghai Lu)
Generic host bridge driver
- Add DT binding for "linux,pci-domain" property (Lucas Stach)
APM X-Gene
- Assign resources to bus before adding new devices (Duc Dang)
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1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=smv9
-----END PGP SIGNATURE-----
Merge tag 'pci-v3.18-fixes-3' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci
Pull PCI fixes from Bjorn Helgaas:
"These are fixes for an issue with 64-bit PCI bus addresses on 32-bit
PAE kernels, an APM X-Gene problem (it depended on a generic change we
removed before merging), a fix for my hotplug device configuration
changes, and a devicetree documentation update.
Resource management:
- Support 64-bit bridge windows if we have 64-bit dma_addr_t (Yinghai Lu)
PCI device hotplug:
- Apply _HPX Link Control settings to all devices with a link (Yinghai Lu)
Generic host bridge driver:
- Add DT binding for "linux,pci-domain" property (Lucas Stach)
APM X-Gene:
- Assign resources to bus before adding new devices (Duc Dang)"
* tag 'pci-v3.18-fixes-3' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci:
PCI: Support 64-bit bridge windows if we have 64-bit dma_addr_t
PCI: Apply _HPX Link Control settings to all devices with a link
PCI: Add missing DT binding for "linux,pci-domain" property
PCI: xgene: Assign resources to bus before adding new devices
Pull SCSI target fixes from Nicholas Bellinger:
"Here are the target-pending fixes queued for v3.18-rc6.
The highlights include:
- target-core OOPs fix with tcm_qla2xxx + vxworks FC initiators +
zero length SCSI commands having a transfer direction set. (Roland
+ Craig Watson)
- vhost-scsi OOPs fix to explicitly prevent WWPN endpoint configfs
group removal while qemu still has an active reference. (Paolo +
nab)
- ib_srpt fix for RDMA hardware with lower srp_sq_size limits.
(Bart)
- two ib_isert work-arounds for running on ocrdma hardware (Or + Sagi
+ Chris)
- iscsi-target discovery portal typo + SPC-3 PR Preempt SA key
matching fix (Steve)"
* git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending:
IB/isert: Adjust CQ size to HW limits
target: return CONFLICT only when SA key unmatched
iser-target: Handle DEVICE_REMOVAL event on network portal listener correctly
ib_isert: Add max_send_sge=2 minimum for control PDU responses
srp-target: Retry when QP creation fails with ENOMEM
iscsi-target: return the correct port in SendTargets
vhost-scsi: Take configfs group dependency during VHOST_SCSI_SET_ENDPOINT
target: Don't call TFO->write_pending if data_length == 0
Pull dmaengine fixes from Vinod Koul:
"We have couple of fixes for dmaengine queued up:
- dma mempcy fix for dma configuration of sun6i by Maxime
- pl330 fixes: First the fixing allocation for data buffers by Liviu
and then Jon's fixe for fifo width and usage"
* 'fixes' of git://git.infradead.org/users/vkoul/slave-dma:
dmaengine: Fix allocation size for PL330 data buffer depth.
dmaengine: pl330: Limit MFIFO usage for memcpy to avoid exhausting entries
dmaengine: pl330: Align DMA memcpy operations to MFIFO width
dmaengine: sun6i: Fix memcpy operation
Pull MIPS fixes from Ralf Baechle:
"More 3.18 fixes for MIPS:
- backtraces were not quite working on on 64-bit kernels
- loongson needs a different cache coherency setting
- Loongson 3 is a MIPS64 R2 version but due to erratum we treat is an
older architecture revision.
- fix build errors due to undefined references to __node_distances
for certain configurations.
- fix instruction decodig in the jump label code.
- for certain configurations copy_{from,to}_user destroy the content
of $3 so that register needs to be marked as clobbed by the calling
code.
- Hardware Table Walker fixes.
- fill the delay slot of the last instruction of memcpy otherwise
whatever ends up there randomly might have undesirable effects.
- ensure get_user/__get_user always zero the variable to be read even
in case of an error"
* 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus:
MIPS: jump_label.c: Handle the microMIPS J instruction encoding
MIPS: jump_label.c: Correct the span of the J instruction
MIPS: Zero variable read by get_user / __get_user in case of an error.
MIPS: lib: memcpy: Restore NOP on delay slot before returning to caller
MIPS: tlb-r4k: Add missing HTW stop/start sequences
MIPS: asm: uaccess: Add v1 register to clobber list on EVA
MIPS: oprofile: Fix backtrace on 64-bit kernel
MIPS: Loongson: Set Loongson-3's ISA level to MIPS64R1
MIPS: Loongson: Fix the write-combine CCA value setting
MIPS: IP27: Fix __node_distances undefined error
MIPS: Loongson3: Fix __node_distances undefined error
Pull powerpc fix from Michael Ellerman:
"One fix from Scott, he says:
This patch fixes a crash (introduced in v3.18-rc1) in the FSL MSI driver
when threaded IRQs are enabled"
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mpe/linux:
powerpc/fsl_msi: mark the msi cascade handler IRQF_NO_THREAD
Pull x86 fixes from Thomas Gleixner:
"Misc fixes:
- gold linker build fix
- noxsave command line parsing fix
- bugfix for NX setup
- microcode resume path bug fix
- _TIF_NOHZ versus TIF_NOHZ bugfix as discussed in the mysterious
lockup thread"
* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86, syscall: Fix _TIF_NOHZ handling in syscall_trace_enter_phase1
x86, kaslr: Handle Gold linker for finding bss/brk
x86, mm: Set NX across entire PMD at boot
x86, microcode: Update BSPs microcode on resume
x86: Require exact match for 'noxsave' command line option
Pull scheduler fixes from Ingo Molnar:
"Misc fixes: two NUMA fixes, two cputime fixes and an RCU/lockdep fix"
* 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
sched/cputime: Fix clock_nanosleep()/clock_gettime() inconsistency
sched/cputime: Fix cpu_timer_sample_group() double accounting
sched/numa: Avoid selecting oneself as swap target
sched/numa: Fix out of bounds read in sched_init_numa()
sched: Remove lockdep check in sched_move_task()
Pull perf fixes from Ingo Molnar:
"Misc fixes: two Intel uncore driver fixes, a CPU-hotplug fix and a
build dependencies fix"
* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
perf/x86/intel/uncore: Fix boot crash on SBOX PMU on Haswell-EP
perf/x86/intel/uncore: Fix IRP uncore register offsets on Haswell EP
perf: Fix corruption of sibling list with hotplug
perf/x86: Fix embarrasing typo
Pull core fix from Ingo Molnar:
"Fix GENMASK macro shift overflow"
Nobody seems to currently use GENMASK() to fill every single last bit
(which is what overflows) in-tree, and gcc would warn about it, so we
have that going for us. But apparently there are pending changes that
want this.
* 'core-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
bitops: Fix shift overflow in GENMASK macros
Commit c3ae62af8e ("tcp: should drop incoming frames without ACK
flag set") was created to mitigate a security vulnerability in which a
local attacker is able to inject data into locally-opened sockets by
using TCP protocol statistics in procfs to quickly find the correct
sequence number.
This broke the RFC5961 requirement to send a challenge ACK in response
to spurious RST packets, which was subsequently fixed by commit
7b514a886b ("tcp: accept RST without ACK flag").
Unfortunately, the RFC5961 requirement that spurious SYN packets be
handled in a similar manner remains broken.
RFC5961 section 4 states that:
... the handling of the SYN in the synchronized state SHOULD be
performed as follows:
1) If the SYN bit is set, irrespective of the sequence number, TCP
MUST send an ACK (also referred to as challenge ACK) to the remote
peer:
<SEQ=SND.NXT><ACK=RCV.NXT><CTL=ACK>
After sending the acknowledgment, TCP MUST drop the unacceptable
segment and stop processing further.
By sending an ACK, the remote peer is challenged to confirm the loss
of the previous connection and the request to start a new connection.
A legitimate peer, after restart, would not have a TCB in the
synchronized state. Thus, when the ACK arrives, the peer should send
a RST segment back with the sequence number derived from the ACK
field that caused the RST.
This RST will confirm that the remote peer has indeed closed the
previous connection. Upon receipt of a valid RST, the local TCP
endpoint MUST terminate its connection. The local TCP endpoint
should then rely on SYN retransmission from the remote end to
re-establish the connection.
This patch lets SYN packets through the discard added in c3ae62af8e,
so that spurious SYN packets are properly dealt with as per the RFC.
The challenge ACK is sent unconditionally and is rate-limited, so the
original vulnerability is not reintroduced by this patch.
Signed-off-by: Calvin Owens <calvinowens@fb.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Not sure what I was thinking, but doing anything after
releasing a refcount is suicidal or/and embarrassing.
By the time we set skb->fclone to SKB_FCLONE_FREE, another cpu
could have released last reference and freed whole skb.
We potentially corrupt memory or trap if CONFIG_DEBUG_PAGEALLOC is set.
Reported-by: Chris Mason <clm@fb.com>
Fixes: ce1a4ea3f1 ("net: avoid one atomic operation in skb_clone()")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Sabrina Dubroca <sd@queasysnail.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
"The biggest change is to rename the filesystem from "overlayfs" to "overlay".
This will allow legacy overlayfs to be easily carried by distros alongside the
new mainline one. Also fix a couple of copy-up races and allow escaping comma
character in filenames."
The last bit is about commas in pathname mount options...
We currently trigger BUG when VIRTIO_NET_F_CTRL_VQ
is not set but one of features depending on it is.
That's not a friendly way to report errors to
hypervisors.
Let's check, and fail probe instead.
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Cornelia Huck <cornelia.huck@de.ibm.com>
Cc: Wanlong Gao <gaowanlong@cn.fujitsu.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Pablo Neira Ayuso says:
====================
Netfilter fixes for net
The following patchset contains two bugfixes for your net tree, they are:
1) Validate netlink group from nfnetlink to avoid an out of bound array
access. This should only happen with superuser priviledges though.
Discovered by Andrey Ryabinin using trinity.
2) Don't push ethernet header before calling the netfilter output hook
for multicast traffic, this breaks ebtables since it expects to see
skb->data pointing to the network header, patch from Linus Luessing.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
John W. Linville says:
====================
pull request: wireless 2014-11-20
Please full this little batch of fixes intended for the 3.18 stream!
For the mac80211 patch, Johannes says:
"Here's another last minute fix, for minstrel HT crashing
depending on the value of some uninitialised stack."
On top of that...
Ben Greear fixes an ath9k regression in which a BSSID mask is
miscalculated.
Dmitry Torokhov corrects an error handling routing in brcmfmac which
was checking an unsigned variable for a negative value.
Johannes Berg avoids a build problem in brcmfmac for arches where
linux/unaligned/access_ok.h and asm/unaligned.h conflict.
Mathy Vanhoef addresses another brcmfmac issue so as to eliminate a
use-after-free of the URB transfer buffer if a timeout occurs.
Please let me know if there are problems!
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
Peer priority groups were being reversed, but this was missed in the previous
fix sent out for this issue.
v2 : Previous patch was doing extra unnecessary work, result is the same.
Please ignore previous patch
Fixes : ee7bc3cdc2 ('cxgb4 : dcb open-lldp interop fixes')
Signed-off-by: Anish Bhatt <anish@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This fixes an old regression introduced by commit
b0d0d915 (ipx: remove the BKL).
When a recvmsg syscall blocks waiting for new data, no data can be sent on the
same socket with sendmsg because ipx_recvmsg() sleeps with the socket locked.
This breaks mars-nwe (NetWare emulator):
- the ncpserv process reads the request using recvmsg
- ncpserv forks and spawns nwconn
- ncpserv calls a (blocking) recvmsg and waits for new requests
- nwconn deadlocks in sendmsg on the same socket
Commit b0d0d915 has simply replaced BKL locking with
lock_sock/release_sock. Unlike now, BKL got unlocked while
sleeping, so a blocking recvmsg did not block a concurrent
sendmsg.
Only keep the socket locked while actually working with the socket data and
release it prior to calling skb_recv_datagram().
Signed-off-by: Jiri Bohac <jbohac@suse.cz>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
