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git://git.kernel.org/pub/scm/linux/kernel/git/groeck/staging
* 'hwmon-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/staging:
hwmon: (lm85) extend to support EMC6D103 chips
MAINTAINERS: Remove stale hwmon quilt tree
hwmon: (k10temp) add support for AMD Family 12h/14h CPUs
hwmon: (jc42) do not allow writing to locked registers
hwmon: (jc42) more helpful documentation
hwmon: (jc42) fix type mismatch
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Add the PCI ID to support the internal temperature sensor of the
AMD "Llano" and "Brazos" processor families.
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Cc: stable@kernel.org # ca86828: x86, AMD, PCI: Add AMD northbridge PCI device
Cc: stable@kernel.org
Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
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On systems where the temperature sensor is actually used, the BIOS is
likely to have locked the alarm registers. In that case, all writes
through the corresponding sysfs files would be silently ignored.
To prevent this, detect the locks and make the affected sysfs files
read-only.
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Cc: stable@kernel.org
Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
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The documentation lists standard numbers and chip names in excruciating
detail, but that's all it does. To help mere mortals in deciding
whether to enable this driver, mention what this sensor is for and in
which systems it might be found.
Also add a link to the actual JC 42.4 specification.
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Cc: stable@kernel.org
Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
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* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6: (37 commits)
net: deinit automatic LIST_HEAD
net: dont leave active on stack LIST_HEAD
net: provide default_advmss() methods to blackhole dst_ops
tg3: Restrict phy ioctl access
drivers/net: Call netif_carrier_off at the end of the probe
ixgbe: work around for DDP last buffer size
ixgbe: fix panic due to uninitialised pointer
e1000e: flush all writebacks before unload
e1000e: check down flag in tasks
isdn: hisax: Use l2headersize() instead of dup (and buggy) func.
arp_notify: unconditionally send gratuitous ARP for NETDEV_NOTIFY_PEERS.
cxgb4vf: Use defined Mailbox Timeout
cxgb4vf: Quiesce Virtual Interfaces on shutdown ...
cxgb4vf: Behave properly when CONFIG_DEBUG_FS isn't defined ...
cxgb4vf: Check driver parameters in the right place ...
pch_gbe: Fix the MAC Address load issue.
iwlwifi: Delete iwl3945_good_plcp_health.
net/can/softing: make CAN_SOFTING_CS depend on CAN_SOFTING
netfilter: nf_iterate: fix incorrect RCU usage
pch_gbe: Fix the issue that the receiving data is not normal.
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-I (include path) should be specified for host builds.
This one was overlooked somehow. Fixes
https://bugzilla.kernel.org/show_bug.cgi?id=25902
Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Reported-by: Alexey Salmin <alexey.salmin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq
* 'fixes-2.6.38' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq:
workqueue: make sure MAYDAY_INITIAL_TIMEOUT is at least 2 jiffies long
workqueue, freezer: unify spelling of 'freeze' + 'able' to 'freezable'
workqueue: wake up a worker when a rescuer is leaving a gcwq
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There are two spellings in use for 'freeze' + 'able' - 'freezable' and
'freezeable'. The former is the more prominent one. The latter is
mostly used by workqueue and in a few other odd places. Unify the
spelling to 'freezable'.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-by: Alan Stern <stern@rowland.harvard.edu>
Acked-by: "Rafael J. Wysocki" <rjw@sisk.pl>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Acked-by: Dmitry Torokhov <dtor@mail.ru>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Alex Dubov <oakad@yahoo.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Steven Whitehouse <swhiteho@redhat.com>
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git://git.kernel.org/pub/scm/linux/kernel/git/airlied/drm-2.6
* 'drm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied/drm-2.6: (27 commits)
drm/radeon/kms: hopefully fix pll issues for real (v3)
drm/radeon/kms: add bounds checking to avivo pll algo
drm: fix wrong usages of drm_device in DRM Developer's Guide
drm/radeon/kms: fix a few more atombios endian issues
drm/radeon/kms: improve 6xx/7xx CS error output
drm/radeon/kms: check AA resolve registers on r300
drm/radeon/kms: fix tracking of BLENDCNTL, COLOR_CHANNEL_MASK, and GB_Z on r300
drm/radeon/kms: use linear aligned for evergreen/ni bo blits
drm/radeon/kms: use linear aligned for 6xx/7xx bo blits
drm/radeon: fix race between GPU reset and TTM delayed delete thread.
drm/radeon/kms: evergreen/ni big endian fixes (v2)
drm/radeon/kms: 6xx/7xx big endian fixes
drm/radeon/kms: atombios big endian fixes
drm/radeon: 6xx/7xx non-kms endian fixes
drm/radeon/kms: optimize CS state checking for r100->r500
drm: do not leak kernel addresses via /proc/dri/*/vma
drm/radeon/kms: add connector table for mac g5 9600
radeon mkregtable: Add missing fclose() calls
drm/radeon/kms: fix interlaced modes on dce4+
drm/radeon: fix memory debugging since d961db75ce86a84f1f04e91ad1014653ed7d9f46
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A few wrong usages of drm_device, which should be drm_driver.
Signed-off-by: Xiao Jiang <jgq516@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
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* 'devicetree/merge' of git://git.secretlab.ca/git/linux-2.6:
Revert "dt: add documentation of ARM dt boot interface"
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This reverts commit 9830fcd6f6a4781d8b46d2b35c13b39f30915c63.
The ARM dt support has not been merged yet; this documentation update
was premature.
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
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* 'spi/merge' of git://git.secretlab.ca/git/linux-2.6:
devicetree-discuss is moderated for non-subscribers
MAINTAINERS: Add entry for GPIO subsystem
dt: add documentation of ARM dt boot interface
dt: Remove obsolete description of powerpc boot interface
dt: Move device tree documentation out of powerpc directory
spi/spi_sh_msiof: fix wrong address calculation, which leads to an Oops
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v3: added details to Documentation/arm/Booting
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
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32 and 64 bit powerpc support has been merged for a while now, but
the booting-without-of.txt document still describes 32 bit as not
supporting multiplatform, which is no longer true. This patch fixes
the documentation.
Also remove references to powerpc-specific details outside of section
I in preparation to add details for other architectures.
v3: cleaned up a lot more powerpc-isms and updated text to reflect current
usage conventions.
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
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The device tree is used by more than just PowerPC. Make the documentation
directory available to all.
v2: reorganized files while moving to create arch and driver specific
directories.
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Acked-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>
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git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-2.6
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-2.6:
ALSA: use linux/io.h to fix compile warnings
ALSA: hda - Fix memory leaks in conexant jack arrays
ASoC: CX20442: fix NULL pointer dereference
ASoC: Amstrad Delta: fix const related build error
ALSA: oxygen: fix output routing on Xonar DG
sound: silent echo'ed messages in Makefile
ASoC: Fix mask/val_mask confusion snd_soc_dapm_put_volsw()
ASoC: DaVinci: fix kernel panic due to uninitialized platform_data
ALSA: HDA: Fix microphone(s) on Lenovo Edge 13
ASoC: Fix module refcount for auxiliary devices
ALSA: HDA: cxt5066 - Use asus model for Asus U50F, select correct SPDIF output
ALSA: HDA: Add a new model "asus" for Conexant 5066/205xx
ALSA: HDA: Refactor some redundant code for Conexant 5066/205xx
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BugLink: http://bugs.launchpad.net/bugs/701271
This new model, named "asus", is identical to the "hp_laptop" model,
except for the location of the internal mic, which is at pin 0x1a.
It is used for Asus K52JU and Lenovo G560.
Signed-off-by: David Henningsson <david.henningsson@canonical.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
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* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6: (68 commits)
net: can: janz-ican3: world-writable sysfs termination file
net: can: at91_can: world-writable sysfs files
MAINTAINERS: update email ids of the be2net driver maintainers.
bridge: Don't put partly initialized fdb into hash
r8169: prevent RxFIFO induced loops in the irq handler.
r8169: RxFIFO overflow oddities with 8168 chipsets.
r8169: use RxFIFO overflow workaround for 8168c chipset.
include/net/genetlink.h: Allow genlmsg_cancel to accept a NULL argument
net: Provide compat support for SIOCGETMIFCNT_IN6 and SIOCGETSGCNT_IN6.
net: Support compat SIOCGETVIFCNT ioctl in ipv4.
net: Fix bug in compat SIOCGETSGCNT handling.
niu: Fix races between up/down and get_stats.
tcp_ecn is an integer not a boolean
atl1c: Add missing PCI device ID
s390: Fix possibly wrong size in strncmp (smsgiucv)
s390: Fix wrong size in memcmp (netiucv)
qeth: allow OSA CHPARM change in suspend state
qeth: allow HiperSockets framesize change in suspend
qeth: add more strict MTU checking
qeth: show new mac-address if its setting fails
...
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There was some confusion at LCA as to why the sysctl tcp_ecn took one
of three values when it was documented as a Boolean. This patch fixes
the documentation.
Signed-off-by: Peter Chubb <peter.chubb@nicta.com.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
* 'sched-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
sched: Fix update_curr_rt()
sched, docs: Update schedstats documentation to version 15
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Version 15 of schedstats was introduced in:
67aa0f767af4: sched: remove unused fields from struct rq
and removed three unused counters in sched_yield(). Update
the documentation.
Signed-off-by: Javi Merino <cibervicho@gmail.com>
Cc: henrix@sapo.pt
Cc: rdunlap@xenotime.net
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
LKML-Reference: <1296515496-8229-1-git-send-email-cibervicho@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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noswapaccount couldn't be used to control memsw for both on/off cases so
we have added swapaccount[=0|1] parameter. This way we can turn the
feature in two ways noswapaccount resp. swapaccount=0. We have kept the
original noswapaccount but I think we should remove it after some time as
it just makes more command line parameters without any advantages and also
the code to handle parameters is uglier if we want both parameters.
Signed-off-by: Michal Hocko <mhocko@suse.cz>
Requested-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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In ntfs_mft_record_alloc() when mapping the new extent mft record with
map_extent_mft_record() we overwrite @m with the return value and on
error, we then try to use the old @m but that is no longer there as @m
now contains an error code instead so we crash when dereferencing the
error code as if it were a pointer.
The simple fix is to use a temporary variable to store the return value
thus preserving the original @m for later use. This is a backport from
the commercial Tuxera-NTFS driver and is well tested...
Thanks go to Julia Lawall for pointing this out (whilst I had fixed it
in the commercial driver I had failed to fix it in the Linux kernel).
Signed-off-by: Anton Altaparmakov <anton@tuxera.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6: (43 commits)
bnx2: Eliminate AER error messages on systems not supporting it
cnic: Fix big endian bug
xfrm6: Don't forget to propagate peer into ipsec route.
tg3: Use new VLAN code
bonding: update documentation - alternate configuration.
TCP: fix a bug that triggers large number of TCP RST by mistake
MAINTAINERS: remove Reinette Chatre as iwlwifi maintainer
rt2x00: add device id for windy31 usb device
mac80211: fix a crash in ieee80211_beacon_get_tim on change_interface
ipv6: Revert 'administrative down' address handling changes.
textsearch: doc - fix spelling in lib/textsearch.c.
USB NET KL5KUSB101: Fix mem leak in error path of kaweth_download_firmware()
pch_gbe: don't use flush_scheduled_work()
bnx2: Always set ETH_FLAG_TXVLAN
net: clear heap allocation for ethtool_get_regs()
ipv6: Always clone offlink routes.
dcbnl: make get_app handling symmetric for IEEE and CEE DCBx
tcp: fix bug in listening_get_next()
inetpeer: Use correct AVL tree base pointer in inet_getpeer().
GRO: fix merging a paged skb after non-paged skbs
...
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The bonding documentation used to provide configuration
details and examples for initscripts and sysconfig only.
This patch describe the third possible configuration:
/etc/network/interfaces.
Signed-off-by: Nicolas de Pesloüan <nicolas.2p.debian@free.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
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git://git.pengutronix.de/git/mkl/linux-2.6
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Due to a chip bug (errata 50.2.6.3 & 50.3.5.3 in
"AT91SAM9263 Preliminary 6249H-ATARM-27-Jul-09") the contents of mailbox
0 may be send under certain conditions (even if disabled or in rx mode).
The workaround in the errata suggests not to use the mailbox and load it
with an unused identifier.
This patch implements the second part of the workaround. A sysfs entry
"mb0_id" is introduced. While the interface is down it can be used to
configure the can_id of mailbox 0. The default value id 0x7ff.
In order to use an extended can_id add the CAN_EFF_FLAG (0x80000000U)
to the can_id. Example:
- standard id 0x7ff:
echo 0x7ff > /sys/class/net/can0/mb0_id
- extended id 0x1fffffff:
echo 0x9fffffff > /sys/class/net/can0/mb0_id
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Acked-by: Wolfgang Grandegger <wg@grandegger.com>
Acked-by: Kurt Van Dijck <kurt.van.dijck@eia.be>
For the Documentation-part:
Acked-by: Wolfram Sang <w.sang@pengutronix.de>
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A B C D E ...
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Fix move of drivers/serial/ to drivers/tty/, where it broke
one of the docbook files:
docproc: drivers/serial/serial_core.c: No such file or directory
Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-2.6
* 'media_fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-2.6: (101 commits)
[media] staging/lirc: fix mem leaks and ptr err usage
[media] hdpvr: reduce latency of i2c read/write w/recycled buffer
[media] hdpvr: enable IR part
[media] rc/mceusb: timeout should be in ns, not us
[media] v4l2-device: fix 'use-after-freed' oops
[media] v4l2-dev: don't memset video_device.dev
[media] zoran: use video_device_alloc instead of kmalloc
[media] w9966: zero device state after a detach
[media] v4l: Fix a use-before-set in the control framework
[media] v4l: Include linux/videodev2.h in media/v4l2-ctrls.h
[media] DocBook/v4l: update V4L2 revision and update copyright years
[media] DocBook/v4l: fix validation error in dev-rds.xml
[media] v4l2-ctrls: queryctrl shouldn't attempt to replace V4L2_CID_PRIVATE_BASE IDs
[media] v4l2-ctrls: fix missing 'read-only' check
[media] pvrusb2: Provide more information about IR units to lirc_zilog and ir-kbd-i2c
[media] ir-kbd-i2c: Add back defaults setting for Zilog Z8's at addr 0x71
[media] lirc_zilog: Update TODO.lirc_zilog
[media] lirc_zilog: Add Andy Walls to copyright notice and authors list
[media] lirc_zilog: Remove useless struct i2c_driver.command function
[media] lirc_zilog: Remove unneeded tests for existence of the IR Tx function
...
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Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
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Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
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Renamed has_new to is_new.
Drivers can use the is_new field to determine if a new value was specified
for a control. The v4l2_ctrl_handler_setup() must always set this to 1 since
the setup has to force a full update of all controls.
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
* 'irq-cleanup-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (37 commits)
um: Use generic irq Kconfig
tile: Use generic irq Kconfig
sparc: Use generic irq Kconfig
score: Use generic irq Kconfig
powerpc: Use generic irq Kconfig
parisc: Use generic irq Kconfig
mn10300: Use generic irq Kconfig
microblaze: Use generic irq Kconfig
m68knommu: Use generic irq Kconfig
ia64: Use generic irq Kconfig
frv: Use generic irq Kconfig
blackfin: Use generic irq Kconfig
alpha: Use generic irq Kconfig
genirq: Remove __do_IRQ
m32r: Convert to generic irq Kconfig
m32r: Convert usrv platform irq handling
m32r: Convert opsput_lcdpld irq chip
m32r: Convert opsput lanpld irq chip
m32r: Convert opsput pld irq chip
m32r: Convert opsput irq chip
...
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All architectures are finally converted. Remove the cruft.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Mike Frysinger <vapier@gentoo.org>
Cc: David Howells <dhowells@redhat.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Greg Ungerer <gerg@uclinux.org>
Cc: Michal Simek <monstr@monstr.eu>
Acked-by: David Howells <dhowells@redhat.com>
Cc: Kyle McMartin <kyle@mcmartin.ca>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Chen Liqin <liqin.chen@sunplusct.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Chris Metcalf <cmetcalf@tilera.com>
Cc: Jeff Dike <jdike@addtoit.com>
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git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-2.6
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-2.6:
ALSA: hda - Fix EAPD to low on CZC P10T tablet computer with ALC662
ALSA: HDA: Add SKU ignore for another Thinkpad Edge 14
ALSA: hda - Fix "unused variable" compile warning
ALSA: hda - Add quirk for HP Z-series workstation
Revert "ALSA: HDA: Create mixers on ALC887"
ASoC: PXA: Fix codec address on Zipit Z2
ASoC: PXA: Fix jack detection on Zipit Z2
ASoC: Blackfin: fix DAI/SPORT config dependency issues
ASoC: Blackfin TDM: use external frame syncs
ASoC: Blackfin AC97: fix build error after multi-component update
ASoC: Blackfin TDM: fix missed snd_soc_dai_get_drvdata update
ASoC: documentation updates
ALSA: ice1712 delta - initialize SPI clock
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This patch is only for RFC purpose of ASoC documentation updates which
match with current ASoC codes with documents. Mostly modify features
are modified to be sync with changes after multi-component patches.
Signed-off-by: Seungwhan Youn <sw.youn@samsung.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
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* git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-for-linus:
virtio: remove virtio-pci root device
LGUEST_GUEST: fix unmet direct dependencies (VIRTUALIZATION && VIRTIO)
lguest: compile fixes
lguest: Use this_cpu_ops
lguest: document --rng in example Launcher
lguest: example launcher to use guard pages, drop PROT_EXEC, fix limit logic
lguest: --username and --chroot options
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Rusty Russell wrote:
> Ah, it will appear as /dev/hwrng. It's a weirdness of Linux that our actual
> hardware number generators are not wired up to /dev/random...
Reflected this in the documentation, thanks :-)
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
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PROT_EXEC seems to be completely unnecessary (as the lguest binary
never executes there), and will allow it to work with SELinux (and
more importantly, PaX :-) as they can/do forbid writable and
executable mappings.
Also, map PROT_NONE guard pages at start and end of guest memory for extra
paranoia.
I changed the length check to addr + size > guest_limit because >= is wrong
(addr of 0, size of getpagesize() with a guest_limit of getpagesize() would
false positive).
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
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I've attached a patch which implements dropping to privileges
and chrooting to a directory.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
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This patch adds basic support for LM94 to the LM93 driver. LM94 specific
sensors and features are not supported.
Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
Acked-by: Jean Delvare <khali@linux-fr.org>
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Currently all filesystems except XFS implement fallocate asynchronously,
while XFS forced a commit. Both of these are suboptimal - in case of O_SYNC
I/O we really want our allocation on disk, especially for the !KEEP_SIZE
case where we actually grow the file with user-visible zeroes. On the
other hand always commiting the transaction is a bad idea for fast-path
uses of fallocate like for example in recent Samba versions. Given
that block allocation is a data plane operation anyway change it from
an inode operation to a file operation so that we have the file structure
available that lets us check for O_SYNC.
This also includes moving the code around for a few of the filesystems,
and remove the already unnedded S_ISDIR checks given that we only wire
up fallocate for regular files.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6: (23 commits)
sanitize vfsmount refcounting changes
fix old umount_tree() breakage
autofs4: Merge the remaining dentry ops tables
Unexport do_add_mount() and add in follow_automount(), not ->d_automount()
Allow d_manage() to be used in RCU-walk mode
Remove a further kludge from __do_follow_link()
autofs4: Bump version
autofs4: Add v4 pseudo direct mount support
autofs4: Fix wait validation
autofs4: Clean up autofs4_free_ino()
autofs4: Clean up dentry operations
autofs4: Clean up inode operations
autofs4: Remove unused code
autofs4: Add d_manage() dentry operation
autofs4: Add d_automount() dentry operation
Remove the automount through follow_link() kludge code from pathwalk
CIFS: Use d_automount() rather than abusing follow_link()
NFS: Use d_automount() rather than abusing follow_link()
AFS: Use d_automount() rather than abusing follow_link()
Add an AT_NO_AUTOMOUNT flag to suppress terminal automount
...
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Unexport do_add_mount() and make ->d_automount() return the vfsmount to be
added rather than calling do_add_mount() itself. follow_automount() will then
do the addition.
This slightly complicates things as ->d_automount() normally wants to add the
new vfsmount to an expiration list and start an expiration timer. The problem
with that is that the vfsmount will be deleted if it has a refcount of 1 and
the timer will not repeat if the expiration list is empty.
To this end, we require the vfsmount to be returned from d_automount() with a
refcount of (at least) 2. One of these refs will be dropped unconditionally.
In addition, follow_automount() must get a 3rd ref around the call to
do_add_mount() lest it eat a ref and return an error, leaving the mount we
have open to being expired as we would otherwise have only 1 ref on it.
d_automount() should also add the the vfsmount to the expiration list (by
calling mnt_set_expiry()) and start the expiration timer before returning, if
this mechanism is to be used. The vfsmount will be unlinked from the
expiration list by follow_automount() if do_add_mount() fails.
This patch also fixes the call to do_add_mount() for AFS to propagate the mount
flags from the parent vfsmount.
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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Allow d_manage() to be called from pathwalk when it is in RCU-walk mode as well
as when it is in Ref-walk mode. This permits __follow_mount_rcu() to call
d_manage() directly. d_manage() needs a parameter to indicate that it is in
RCU-walk mode as it isn't allowed to sleep if in that mode (but should return
-ECHILD instead).
autofs4_d_manage() can then be set to retain RCU-walk mode if the daemon
accesses it and otherwise request dropping back to ref-walk mode.
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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Add a dentry op (d_manage) to permit a filesystem to hold a process and make it
sleep when it tries to transit away from one of that filesystem's directories
during a pathwalk. The operation is keyed off a new dentry flag
(DCACHE_MANAGE_TRANSIT).
The filesystem is allowed to be selective about which processes it holds and
which it permits to continue on or prohibits from transiting from each flagged
directory. This will allow autofs to hold up client processes whilst letting
its userspace daemon through to maintain the directory or the stuff behind it
or mounted upon it.
The ->d_manage() dentry operation:
int (*d_manage)(struct path *path, bool mounting_here);
takes a pointer to the directory about to be transited away from and a flag
indicating whether the transit is undertaken by do_add_mount() or
do_move_mount() skipping through a pile of filesystems mounted on a mountpoint.
It should return 0 if successful and to let the process continue on its way;
-EISDIR to prohibit the caller from skipping to overmounted filesystems or
automounting, and to use this directory; or some other error code to return to
the user.
->d_manage() is called with namespace_sem writelocked if mounting_here is true
and no other locks held, so it may sleep. However, if mounting_here is true,
it may not initiate or wait for a mount or unmount upon the parameter
directory, even if the act is actually performed by userspace.
Within fs/namei.c, follow_managed() is extended to check with d_manage() first
on each managed directory, before transiting away from it or attempting to
automount upon it.
follow_down() is renamed follow_down_one() and should only be used where the
filesystem deliberately intends to avoid management steps (e.g. autofs).
A new follow_down() is added that incorporates the loop done by all other
callers of follow_down() (do_add/move_mount(), autofs and NFSD; whilst AFS, NFS
and CIFS do use it, their use is removed by converting them to use
d_automount()). The new follow_down() calls d_manage() as appropriate. It
also takes an extra parameter to indicate if it is being called from mount code
(with namespace_sem writelocked) which it passes to d_manage(). follow_down()
ignores automount points so that it can be used to mount on them.
__follow_mount_rcu() is made to abort rcu-walk mode if it hits a directory with
DCACHE_MANAGE_TRANSIT set on the basis that we're probably going to have to
sleep. It would be possible to enter d_manage() in rcu-walk mode too, and have
that determine whether to abort or not itself. That would allow the autofs
daemon to continue on in rcu-walk mode.
Note that DCACHE_MANAGE_TRANSIT on a directory should be cleared when it isn't
required as every tranist from that directory will cause d_manage() to be
invoked. It can always be set again when necessary.
==========================
WHAT THIS MEANS FOR AUTOFS
==========================
Autofs currently uses the lookup() inode op and the d_revalidate() dentry op to
trigger the automounting of indirect mounts, and both of these can be called
with i_mutex held.
autofs knows that the i_mutex will be held by the caller in lookup(), and so
can drop it before invoking the daemon - but this isn't so for d_revalidate(),
since the lock is only held on _some_ of the code paths that call it. This
means that autofs can't risk dropping i_mutex from its d_revalidate() function
before it calls the daemon.
The bug could manifest itself as, for example, a process that's trying to
validate an automount dentry that gets made to wait because that dentry is
expired and needs cleaning up:
mkdir S ffffffff8014e05a 0 32580 24956
Call Trace:
[<ffffffff885371fd>] :autofs4:autofs4_wait+0x674/0x897
[<ffffffff80127f7d>] avc_has_perm+0x46/0x58
[<ffffffff8009fdcf>] autoremove_wake_function+0x0/0x2e
[<ffffffff88537be6>] :autofs4:autofs4_expire_wait+0x41/0x6b
[<ffffffff88535cfc>] :autofs4:autofs4_revalidate+0x91/0x149
[<ffffffff80036d96>] __lookup_hash+0xa0/0x12f
[<ffffffff80057a2f>] lookup_create+0x46/0x80
[<ffffffff800e6e31>] sys_mkdirat+0x56/0xe4
versus the automount daemon which wants to remove that dentry, but can't
because the normal process is holding the i_mutex lock:
automount D ffffffff8014e05a 0 32581 1 32561
Call Trace:
[<ffffffff80063c3f>] __mutex_lock_slowpath+0x60/0x9b
[<ffffffff8000ccf1>] do_path_lookup+0x2ca/0x2f1
[<ffffffff80063c89>] .text.lock.mutex+0xf/0x14
[<ffffffff800e6d55>] do_rmdir+0x77/0xde
[<ffffffff8005d229>] tracesys+0x71/0xe0
[<ffffffff8005d28d>] tracesys+0xd5/0xe0
which means that the system is deadlocked.
This patch allows autofs to hold up normal processes whilst the daemon goes
ahead and does things to the dentry tree behind the automouter point without
risking a deadlock as almost no locks are held in d_manage() and none in
d_automount().
Signed-off-by: David Howells <dhowells@redhat.com>
Was-Acked-by: Ian Kent <raven@themaw.net>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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Add a dentry op (d_automount) to handle automounting directories rather than
abusing the follow_link() inode operation. The operation is keyed off a new
dentry flag (DCACHE_NEED_AUTOMOUNT).
This also makes it easier to add an AT_ flag to suppress terminal segment
automount during pathwalk and removes the need for the kludge code in the
pathwalk algorithm to handle directories with follow_link() semantics.
The ->d_automount() dentry operation:
struct vfsmount *(*d_automount)(struct path *mountpoint);
takes a pointer to the directory to be mounted upon, which is expected to
provide sufficient data to determine what should be mounted. If successful, it
should return the vfsmount struct it creates (which it should also have added
to the namespace using do_add_mount() or similar). If there's a collision with
another automount attempt, NULL should be returned. If the directory specified
by the parameter should be used directly rather than being mounted upon,
-EISDIR should be returned. In any other case, an error code should be
returned.
The ->d_automount() operation is called with no locks held and may sleep. At
this point the pathwalk algorithm will be in ref-walk mode.
Within fs/namei.c itself, a new pathwalk subroutine (follow_automount()) is
added to handle mountpoints. It will return -EREMOTE if the automount flag was
set, but no d_automount() op was supplied, -ELOOP if we've encountered too many
symlinks or mountpoints, -EISDIR if the walk point should be used without
mounting and 0 if successful. The path will be updated to point to the mounted
filesystem if a successful automount took place.
__follow_mount() is replaced by follow_managed() which is more generic
(especially with the patch that adds ->d_manage()). This handles transits from
directories during pathwalk, including automounting and skipping over
mountpoints (and holding processes with the next patch).
__follow_mount_rcu() will jump out of RCU-walk mode if it encounters an
automount point with nothing mounted on it.
follow_dotdot*() does not handle automounts as you don't want to trigger them
whilst following "..".
I've also extracted the mount/don't-mount logic from autofs4 and included it
here. It makes the mount go ahead anyway if someone calls open() or creat(),
tries to traverse the directory, tries to chdir/chroot/etc. into the directory,
or sticks a '/' on the end of the pathname. If they do a stat(), however,
they'll only trigger the automount if they didn't also say O_NOFOLLOW.
I've also added an inode flag (S_AUTOMOUNT) so that filesystems can mark their
inodes as automount points. This flag is automatically propagated to the
dentry as DCACHE_NEED_AUTOMOUNT by __d_instantiate(). This saves NFS and could
save AFS a private flag bit apiece, but is not strictly necessary. It would be
preferable to do the propagation in d_set_d_op(), but that doesn't normally
have access to the inode.
[AV: fixed breakage in case if __follow_mount_rcu() fails and nameidata_drop_rcu()
succeeds in RCU case of do_lookup(); we need to fall through to non-RCU case after
that, rather than just returning with ungrabbed *path]
Signed-off-by: David Howells <dhowells@redhat.com>
Was-Acked-by: Ian Kent <raven@themaw.net>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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