After acquiring the semlock spinlock, operations must test that the
array is still valid.
- semctl() and exit_sem() would walk stale linked lists (ugly, but
should be ok: all lists are empty)
- semtimedop() would sleep forever - and if woken up due to a signal -
access memory after free.
The patch also:
- standardizes the tests for .deleted, so that all tests in one
function leave the function with the same approach.
- unconditionally tests for .deleted immediately after every call to
sem_lock - even it it means that for semctl(GETALL), .deleted will be
tested twice.
Both changes make the review simpler: After every sem_lock, there must
be a test of .deleted, followed by a goto to the cleanup code (if the
function uses "goto cleanup").
The only exception is semctl_down(): If sem_ids().rwsem is locked, then
the presence in ids->ipcs_idr is equivalent to !.deleted, thus no
additional test is required.
Signed-off-by: Manfred Spraul <manfred@colorfullife.com>
Cc: Mike Galbraith <efault@gmx.de>
Acked-by: Davidlohr Bueso <davidlohr@hp.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
The initial documentation was a bit incomplete, update accordingly.
[akpm@linux-foundation.org: make it more readable in 80 columns]
Signed-off-by: Davidlohr Bueso <davidlohr@hp.com>
Acked-by: Manfred Spraul <manfred@colorfullife.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
for_each_online_cpu() needs the protection of {get,put}_online_cpus() so
cpu_online_mask doesn't change during the iteration.
cpu_hotplug.lock is held while a cpu is going down, it's a coarse lock
that is used kernel-wide to synchronize cpu hotplug activity. Memcg has
a cpu hotplug notifier, called while there may not be any cpu hotplug
refcounts, which drains per-cpu event counts to memcg->nocpu_base.events
to maintain a cumulative event count as cpus disappear. Without
get_online_cpus() in mem_cgroup_read_events(), it's possible to account
for the event count on a dying cpu twice, and this value may be
significantly large.
In fact, all memcg->pcp_counter_lock use should be nested by
{get,put}_online_cpus().
This fixes that issue and ensures the reported statistics are not vastly
over-reported during cpu hotplug.
Signed-off-by: David Rientjes <rientjes@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Acked-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This adds the .init_array section as yet another section with constructors. This
is needed because gcc could add __gcov_init calls to .init_array or .ctors
section, depending on gcc (and binutils) version .
v2: - reuse mod->ctors for .init_array section for modules, because gcc uses
.ctors or .init_array, but not both at the same time
v3: - fail to load if that does happen somehow.
Signed-off-by: Frantisek Hrbata <fhrbata@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This patch fixes the following type of sparse warnings:
drivers/staging/rtl8192u/ieee80211/ieee80211_tx.c:247:17: warning: incorrect type in argument 2 (different base types)
drivers/staging/rtl8192u/ieee80211/ieee80211_tx.c:247:17: expected restricted gfp_t [usertype] flags
drivers/staging/rtl8192u/ieee80211/ieee80211_tx.c:247:17: got int [signed] gfp_mask
Signed-off-by: Teodora Baluta <teobaluta@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
These functions are already marked extern in the header file
drivers/staging/rtl8192u/r819xU_phy.c:1716:13: warning: function 'InitialGainOperateWorkItemCallBack' with external linkage has definition
drivers/staging/rtl8192u/r819xU_cmdpkt.c:497:12: warning: function 'cmpk_message_handle_rx' with external linkage has definition
Signed-off-by: Teodora Baluta <teobaluta@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This patch fixes the following Sparse Warnings in rf.c:
drivers/staging/vt6655/rf.c:58:21: warning: symbol 'dwAL2230InitTable' was not declared. Should it be static?
drivers/staging/vt6655/rf.c:76:21: warning: symbol 'dwAL2230ChannelTable0' was not declared. Should it be static?
drivers/staging/vt6655/rf.c:93:21: warning: symbol 'dwAL2230ChannelTable1' was not declared. Should it be static?
drivers/staging/vt6655/rf.c:110:15: warning: symbol 'dwAL2230PowerTable' was not declared. Should it be static?
drivers/staging/vt6655/rf.c:180:21: warning: symbol 'dwAL7230InitTable' was not declared. Should it be static?
drivers/staging/vt6655/rf.c:203:21: warning: symbol 'dwAL7230InitTableAMode' was not declared. Should it be static?
drivers/staging/vt6655/rf.c:222:21: warning: symbol 'dwAL7230ChannelTable0' was not declared. Should it be static?
drivers/staging/vt6655/rf.c:288:21: warning: symbol 'dwAL7230ChannelTable1' was not declared. Should it be static?
drivers/staging/vt6655/rf.c:352:21: warning: symbol 'dwAL7230ChannelTable2' was not declared. Should it be static?
drivers/staging/vt6655/rf.c:431:6: warning: symbol 's_bAL7230Init' was not declared. Should it be static?
drivers/staging/vt6655/rf.c:474:6: warning: symbol 's_bAL7230SelectChannel' was not declared. Should it be static?
drivers/staging/vt6655/rf.c:634:6: warning: symbol 'RFbAL2230Init' was not declared. Should it be static?
drivers/staging/vt6655/rf.c:681:6: warning: symbol 'RFbAL2230SelectChannel' was not declared. Should it be static?
Signed-off-by: Rashika Kheria <rashika.kheria@gmail.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
When inserting a wrong value to /sys/devices/system/memory/memoryX/state file,
following messages are shown. And device_hotplug_lock is never released.
================================================
[ BUG: lock held when returning to user space! ]
3.12.0-rc4-debug+ #3 Tainted: G W
------------------------------------------------
bash/6442 is leaving the kernel with locks still held!
1 lock held by bash/6442:
#0: (device_hotplug_lock){+.+.+.}, at: [<ffffffff8146cbb5>] lock_device_hotplug_sysfs+0x15/0x50
This issue was introdued by commit fa2be40 (drivers: base: use standard
device online/offline for state change).
This patch releases device_hotplug_lcok when store_mem_state returns EINVAL.
Signed-off-by: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Reviewed-by: Toshi Kani <toshi.kani@hp.com>
CC: Seth Jennings <sjenning@linux.vnet.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
The dev_attrs field of struct bus_type is going away soon, dev_groups
should be used instead. This converts the i2o bus code to use the
correct field.
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
The dev_attrs field of struct bus_type is going away soon, dev_groups
should be used instead. This converts the memstick bus code to use the
correct field.
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
The dev_attrs field of struct bus_type is going away soon, dev_groups
should be used instead. This converts the tifm bus code to use the
correct field.
Cc: Alex Dubov <oakad@yahoo.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
The dev_attrs field of struct bus_type is going away soon, dev_groups
should be used instead. This converts the virtio bus code to use the
correct field.
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: <virtualization@lists.linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
The dev_attrs field of struct bus_type is going away soon, dev_groups
should be used instead. This converts the ipack bus code to use the
correct field.
Acked-by: Samuel Iglesias Gonsalvez <siglesias@igalia.com>
Cc: Jens Taprogge <jens.taprogge@taprogge.org>
Cc: <industrypack-devel@lists.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
The dev_attrs field of struct bus_type is going away soon, dev_groups
should be used instead. This converts the ide bus code to use the
correct field.
Acked-by: David S. Miller <davem@davemloft.net>
Cc: <linux-ide@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
The dev_attrs field of struct bus_type is going away soon, dev_groups
should be used instead. This converts the hsi code to use the
correct field.
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Kees Cook <keescook@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
The dev_attrs field of struct bus_type is going away soon, dev_groups
should be used instead. This converts the xenbus code to use the
correct field.
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Acked-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: David Vrabel <david.vrabel@citrix.com>
Cc: <xen-devel@lists.xenproject.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
The dev_attrs field of struct bus_type is going away soon, dev_groups
should be used instead. This converts the ssb bus code to use the
correct field.
Cc: Michael Buesch <m@bues.ch>
Cc: <netdev@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
The dev_attrs field of struct bus_type is going away soon, dev_groups
should be used instead. This converts the rapidio bus code to use the
correct field.
Cc: Matt Porter <mporter@kernel.crashing.org>
Cc: Alexandre Bounine <alexandre.bounine@idt.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
The dev_attrs field of struct bus_type is going away soon, dev_groups
should be used instead. This converts the pcmcia bus code to use the
correct field.
Cc: Bill Pemberton <wfp5p@virginia.edu>
Cc: <linux-pcmcia@lists.infradead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
The dev_attrs field of struct bus_type is going away soon, dev_groups
should be used instead. This converts the bcma bus code to use the
correct field.
Acked-by: Rafał Miłecki <zajec5@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
The dev_attrs field of struct bus_type is going away soon, dev_groups
should be used instead. This converts the uwb bus code to use the
correct field.
Cc: Bruno Morelli <bruno@evidence.eu.com>
Cc: <linux-usb@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
The dev_attrs field of struct bus_type is going away soon, dev_groups
should be used instead. This converts the MMC bus code to use the
correct field.
Cc: Chris Ball <cjb@laptop.org>
Cc: Ulf Hansson <ulf.hansson@linaro.org>
Cc: Konstantin Dorfman <kdorfman@codeaurora.org>
Cc: Seungwon Jeon <tgih.jun@samsung.com>
Cc: <linux-mmc@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
The dev_attrs field of struct bus_type is going away soon, dev_groups
should be used instead. This converts the PNP bus code to use the
correct field.
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Currently, devm_ managed memory only supports kzalloc.
Convert the devm_kzalloc implementation to devm_kmalloc and remove the
complete memset to 0 but still set the initial struct devres header and
whatever padding before data to 0.
Add the other normal alloc variants as static inlines with __GFP_ZERO
added to the gfp flag where appropriate:
devm_kzalloc
devm_kcalloc
devm_kmalloc_array
Add gfp.h to device.h for the newly added static inlines.
akpm: the current API forces us to replace kmalloc() with kzalloc() when
performing devm_ conversions. This adds a relatively minor overhead.
More significantly, it will defeat kmemcheck used-uninitialized checking,
and for a particular driver, losing used-uninitialised checking for their
core controlling data structures will significantly degrade kmemcheck
usefulness.
Signed-off-by: Joe Perches <joe@perches.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Sangjung Woo <sangjung.woo@samsung.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
I worried that the delay of the sdma_run_channel0() maybe too long for
interrupt context, so I added the workqueues for RX/TX DMA.
But tested with bluetooth device, I find that the delay of sdma_run_channel0()
is about 8us (tested in imx6dl sabreauto board). I think the delay
is acceptable.
This patch removes the RX/TX workqueues for DMA, it makes the
code more clear.
Signed-off-by: Huang Shijie <b32955@freescale.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This lets the transport do endian conversion if necessary, and insulates
the drivers from the difference.
Most drivers can use the simple helpers virtio_cread() and virtio_cwrite().
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Pull tmpfile fix from Al Viro:
"A fix for double iput() in ->tmpfile() on ext3 and ext4; I'd fucked it
up, Miklos has caught it"
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
ext[34]: fix double put in tmpfile
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Merge tag 'dm-3.12-fix-cve' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm
Pull device-mapper fix from Alasdair Kergon:
"A patch to avoid data corruption in a device-mapper snapshot.
This is primarily a data corruption bug that all users of
device-mapper snapshots will want to fix. The CVE is due to a data
leak under specific circumstances if, for example, the snapshot is
presented to a virtual machine: a block written as data inside the VM
can get interpreted incorrectly on the host outside the VM as
metadata, causing the host to provide the VM with access to blocks it
would not otherwise see. This is likely to affect few, if any,
people"
* tag 'dm-3.12-fix-cve' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm:
dm snapshot: fix data corruption
- A fix to the Lynxpoint IRQ handler
- Two late fixes to fallout from the gpiod refactoring
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Merge tag 'gpio-v3.12-3' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio
Pull gpio fixes from Linus Walleij:
"Three GPIO fixes for the v3.12 series:
- A fix to the Lynxpoint IRQ handler
- Two late fixes to fallout from the gpiod refactoring"
* tag 'gpio-v3.12-3' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio:
gpiolib: let gpiod_request() return -EPROBE_DEFER
gpiolib: safer implementation of desc_to_gpio()
gpio/lynxpoint: check if the interrupt is enabled in IRQ handler
Reserved fields of the sync instruction have been used for other
instructions (e.g. lwsync). On processors that do not support variants
of the sync instruction, emulate it by executing a sync to subsume the
effect of the intended instruction.
Signed-off-by: James Yang <James.Yang@freescale.com>
[scottwood@freescale.com: whitespace and subject line fix]
Signed-off-by: Scott Wood <scottwood@freescale.com>
On Book3E some SPE/FP/AltiVec interrupts share the same number. Use
common defines to indentify these numbers.
Signed-off-by: Mihai Caraman <mihai.caraman@freescale.com>
[scottwood@freescale.com: fixed space-before-tab]
Signed-off-by: Scott Wood <scottwood@freescale.com>
On Book3E some SPE/FP/AltiVec interrupts share the same number. Use
common defines to indentify these numbers.
Signed-off-by: Mihai Caraman <mihai.caraman@freescale.com>
Signed-off-by: Scott Wood <scottwood@freescale.com>
The Kconfig entry that allows to "Distribute interrupts on all CPUs by
default" has a (negative) dependency on MV64360. But that Kconfig symbol
was removed in v2.6.27, which means that this dependency has evaluated
to true ever since. It can be removed too.
Signed-off-by: Paul Bolle <pebolle@tiscali.nl>
Signed-off-by: Scott Wood <scottwood@freescale.com>
The function update_policy_cpu() is expected to be called when the policy->cpu
of a cpufreq policy is to be changed: ie., the new CPU nominated to become the
policy->cpu is different from the old one.
Print a warning if it is invoked with new_cpu == old_cpu, since such an
invocation might hint at a faulty logic in the caller.
Suggested-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Enable cpufreq on iMac G5 (iSight) model. Tested with the 2.1 GHz version.
Signed-off-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Currently cpufreq ondemand governor cannot used on older G5 models,
because the transition latency is set to CPUFREQ_ETERNAL. Provide a
value based on a measurement on Xserve G5, which happens to be also the
highest allowed latency.
Signed-off-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Some functions on switch path use msleep() which is inaccurate, and
depends on HZ. With HZ=100 msleep(1) takes actually over ten times longer.
Using usleep_range() we get more accurate sleeps.
I measured the "pfunc_slewing_done" polling to take 300us at max (on
2.3GHz dual-processor Xserve G5), so using 500us sleep there should
be fine.
With the patch, g5_switch_freq() duration drops from ~50ms to ~10ms on
Xserve with HZ=100.
Signed-off-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Calxeda's new ECX-2000 part uses the same cpufreq interface as highbank,
so add it to the driver's compatibility list.
This is a minor change that can safely be applied to the 3.10 and 3.11
stable trees.
Signed-off-by: Mark Langsdorf <mark.langsdorf@calxeda.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Only used for debug output, so we don't need to save it.
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Perform an unconditional toggle of the cycle bit with 'xor'.
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Remove a few extra lines and make it clear that all implementations
disable the port by sharing the same line of code.
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Currently, code checks false return value from "regulator_set_voltage"
to show failure message. Modify the code to check proper return
value from "regulator_set_voltage".
Signed-off-by: Manish Badarkhe <badarkhe.manish@gmail.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Implement target reset by resetting the transport status.
(nab: Remove unused ret in tcm_loop_target_reset)
Signed-off-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Currently, code include opp.h twice. Remove one inclusion
of opp.h
Signed-off-by: Manish Badarkhe <badarkhe.manish@gmail.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
