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git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap
Pull regmap fix from Mark Brown:
"regmap: Fix for nodev mode
Add mising braces so that the nodev mode actually works (which was a
bit of an oversight)"
Testing schmesting. We don't need not steenking testing. We have
deadlines to beat, and new code to write.
* tag 'regmap-v3.15-nodev' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap:
regmap: adds missing braces in regmap_init()
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It need to add curly braces because the inner for "if" has
two statements.
coccicheck says:
drivers/base/regmap/regmap.c:765:2-44:
code aligned with following code on line 766
Signed-off-by: Daeseok Youn <daeseok.youn@gmail.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
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* pm-wakeup:
PM / wakeup: Correct presence vs. emptiness of wakeup_* attributes
* pm-domains:
PM / domains: Add pd_ignore_unused to keep power domains enabled
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Keep all power-domains already enabled by bootloader on, even if no
driver has claimed them. This is useful for debug and development, but
should not be needed on a platform with proper driver support.
Signed-off-by: Tushar Behera <tushar.behera@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
Pull CPU hotplug notifiers registration fixes from Rafael Wysocki:
"The purpose of this single series of commits from Srivatsa S Bhat
(with a small piece from Gautham R Shenoy) touching multiple
subsystems that use CPU hotplug notifiers is to provide a way to
register them that will not lead to deadlocks with CPU online/offline
operations as described in the changelog of commit 93ae4f978ca7f ("CPU
hotplug: Provide lockless versions of callback registration
functions").
The first three commits in the series introduce the API and document
it and the rest simply goes through the users of CPU hotplug notifiers
and converts them to using the new method"
* tag 'cpu-hotplug-3.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (52 commits)
net/iucv/iucv.c: Fix CPU hotplug callback registration
net/core/flow.c: Fix CPU hotplug callback registration
mm, zswap: Fix CPU hotplug callback registration
mm, vmstat: Fix CPU hotplug callback registration
profile: Fix CPU hotplug callback registration
trace, ring-buffer: Fix CPU hotplug callback registration
xen, balloon: Fix CPU hotplug callback registration
hwmon, via-cputemp: Fix CPU hotplug callback registration
hwmon, coretemp: Fix CPU hotplug callback registration
thermal, x86-pkg-temp: Fix CPU hotplug callback registration
octeon, watchdog: Fix CPU hotplug callback registration
oprofile, nmi-timer: Fix CPU hotplug callback registration
intel-idle: Fix CPU hotplug callback registration
clocksource, dummy-timer: Fix CPU hotplug callback registration
drivers/base/topology.c: Fix CPU hotplug callback registration
acpi-cpufreq: Fix CPU hotplug callback registration
zsmalloc: Fix CPU hotplug callback registration
scsi, fcoe: Fix CPU hotplug callback registration
scsi, bnx2fc: Fix CPU hotplug callback registration
scsi, bnx2i: Fix CPU hotplug callback registration
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Subsystems that want to register CPU hotplug callbacks, as well as perform
initialization for the CPUs that are already online, often do it as shown
below:
get_online_cpus();
for_each_online_cpu(cpu)
init_cpu(cpu);
register_cpu_notifier(&foobar_cpu_notifier);
put_online_cpus();
This is wrong, since it is prone to ABBA deadlocks involving the
cpu_add_remove_lock and the cpu_hotplug.lock (when running concurrently
with CPU hotplug operations).
Instead, the correct and race-free way of performing the callback
registration is:
cpu_notifier_register_begin();
for_each_online_cpu(cpu)
init_cpu(cpu);
/* Note the use of the double underscored version of the API */
__register_cpu_notifier(&foobar_cpu_notifier);
cpu_notifier_register_done();
Fix the topology code by using this latter form of callback registration.
Cc: Ingo Molnar <mingo@kernel.org>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial
Pull trivial tree updates from Jiri Kosina:
"Usual rocket science -- mostly documentation and comment updates"
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial:
sparse: fix comment
doc: fix double words
isdn: capi: fix "CAPI_VERSION" comment
doc: DocBook: Fix typos in xml and template file
Bluetooth: add module name for btwilink
driver core: unexport static function create_syslog_header
mmc: core: typo fix in printk specifier
ARM: spear: clean up editing mistake
net-sysfs: fix comment typo 'CONFIG_SYFS'
doc: Insert MODULE_ in module-signing macros
Documentation: update URL to hfsplus Technote 1150
gpio: update path to documentation
ixgbe: Fix format string in ixgbe_fcoe.
Kconfig: Remove useless "default N" lines
user_namespace.c: Remove duplicated word in comment
CREDITS: fix formatting
treewide: Fix typo in Documentation/DocBook
mm: Fix warning on make htmldocs caused by slab.c
ata: ata-samsung_cf: cleanup in header file
idr: remove unused prototype of idr_free()
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Function create_syslog_header() is defined as static, so it should
not be exported.
Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
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This patch fix spelling typo in Documentation/DocBook.
It is because .html and .xml files are generated by make htmldocs,
I have to fix a typo within the source files.
Signed-off-by: Masanari Iida <standby24x7@gmail.com>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
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git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
Pull more ACPI and power management updates from Rafael Wysocki:
"These are commits that were not quite ready when I sent the original
pull request for 3.15-rc1 several days ago, but they have spent some
time in linux-next since then and appear to be good to go. All of
them are fixes and cleanups.
Specifics:
- Remaining changes from upstream ACPICA release 20140214 that
introduce code to automatically serialize the execution of methods
creating any named objects which really cannot be executed in
parallel with each other anyway (previously ACPICA attempted to
address that by aborting methods upon conflict detection, but that
wasn't reliable enough and led to other issues). From Bob Moore
and Lv Zheng.
- intel_pstate fix to use del_timer_sync() instead of del_timer() in
the exit path before freeing the timer structure from Dirk
Brandewie (original patch from Thomas Gleixner).
- cpufreq fix related to system resume from Viresh Kumar.
- Serialization of frequency transitions in cpufreq that involve
PRECHANGE and POSTCHANGE notifications to avoid ordering issues
resulting from race conditions. From Srivatsa S Bhat and Viresh
Kumar.
- Revert of an ACPI processor driver change that was based on a
specific interpretation of the ACPI spec which may not be correct
(the relevant part of the spec appears to be incomplete). From
Hanjun Guo.
- Runtime PM core cleanups and documentation updates from Geert
Uytterhoeven.
- PNP core cleanup from Michael Opdenacker"
* tag 'pm+acpi-3.15-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
cpufreq: Make cpufreq_notify_transition & cpufreq_notify_post_transition static
cpufreq: Convert existing drivers to use cpufreq_freq_transition_{begin|end}
cpufreq: Make sure frequency transitions are serialized
intel_pstate: Use del_timer_sync in intel_pstate_cpu_stop
cpufreq: resume drivers before enabling governors
PM / Runtime: Spelling s/competing/completing/
PM / Runtime: s/foo_process_requests/foo_process_next_request/
PM / Runtime: GENERIC_SUBSYS_PM_OPS is gone
PM / Runtime: Correct documented return values for generic PM callbacks
PM / Runtime: Split line longer than 80 characters
PM / Runtime: dev_pm_info.runtime_error is signed
Revert "ACPI / processor: Make it possible to get APIC ID via GIC"
ACPICA: Enable auto-serialization as a default kernel behavior.
ACPICA: Ignore sync_level for methods that have been auto-serialized.
ACPICA: Add additional named objects for the auto-serialize method scan.
ACPICA: Add auto-serialization support for ill-behaved control methods.
ACPICA: Remove global option to serialize all control methods.
PNP: remove deprecated IRQF_DISABLED
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* pm-runtime:
PM / Runtime: Spelling s/competing/completing/
PM / Runtime: s/foo_process_requests/foo_process_next_request/
PM / Runtime: GENERIC_SUBSYS_PM_OPS is gone
PM / Runtime: Correct documented return values for generic PM callbacks
PM / Runtime: Split line longer than 80 characters
PM / Runtime: dev_pm_info.runtime_error is signed
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Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core
Pull driver core and sysfs updates from Greg KH:
"Here's the big driver core / sysfs update for 3.15-rc1.
Lots of kernfs updates to make it useful for other subsystems, and a
few other tiny driver core patches.
All have been in linux-next for a while"
* tag 'driver-core-3.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: (42 commits)
Revert "sysfs, driver-core: remove unused {sysfs|device}_schedule_callback_owner()"
kernfs: cache atomic_write_len in kernfs_open_file
numa: fix NULL pointer access and memory leak in unregister_one_node()
Revert "driver core: synchronize device shutdown"
kernfs: fix off by one error.
kernfs: remove duplicate dir.c at the top dir
x86: align x86 arch with generic CPU modalias handling
cpu: add generic support for CPU feature based module autoloading
sysfs: create bin_attributes under the requested group
driver core: unexport static function create_syslog_header
firmware: use power efficient workqueue for unloading and aborting fw load
firmware: give a protection when map page failed
firmware: google memconsole driver fixes
firmware: fix google/gsmi duplicate efivars_sysfs_init()
drivers/base: delete non-required instances of include <linux/init.h>
kernfs: fix kernfs_node_from_dentry()
ACPI / platform: drop redundant ACPI_HANDLE check
kernfs: fix hash calculation in kernfs_rename_ns()
kernfs: add CONFIG_KERNFS
sysfs, kobject: add sysfs wrapper for kernfs_enable_ns()
...
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{sysfs|device}_schedule_callback_owner()"
This reverts commit d1ba277e79889085a2faec3b68b91ce89c63f888.
As reported by Stephen, this patch breaks linux-next as a ppc patch
suddenly (after 2 years) started using this old api call. So revert it
for now, it will go away in 3.15-rc2 when we can change the PPC call to
the new api.
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Tejun Heo <tj@kernel.org>
Cc: Stewart Smith <stewart@linux.vnet.ibm.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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When doing socket hot remove, "node_devices[nid]" is set to NULL;
acpi_processor_remove()
try_offline_node()
unregister_one_node()
Then hot add a socket, but do not echo 1 > /sys/devices/system/cpu/cpuXX/online,
so register_one_node() will not be called, and "node_devices[nid]"
is still NULL.
If doing socket hot remove again, NULL pointer access will be happen.
unregister_one_node()
unregister_node()
Another, we should free the memory used by "node_devices[nid]" in
unregister_one_node().
Signed-off-by: Xishi Qiu <qiuxishi@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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This reverts commit 401097ea4b89846d66ac78f7f108d49c2e922d9c. The
original changelog said:
A patch series to make .shutdown execute asynchronously. Some drivers's
shutdown can take a lot of time. The patches can help save some shutdown
time. The patches use Arjan's async API.
This patch:
synchronize all tasks submitted by .shutdown
However, I'm not able to find any evidence that any other patches from
this series were applied, nor am I able to find any async tasks that are
scheduled in a .shutdown context.
On the other hand, we see occasional hangs on shutdown that appear to be
caused by the async_synchronize_full() in device_shutdown() waiting
forever for the async probing in sd if a SCSI disk shows up at just the
wrong time — the system starts the probe, but begins shutting down and
tears down too much of the SCSI driver to finish the probe.
If we had any async shutdown tasks, I guess the right fix would be to
create a "shutdown" async domain and have device_shutdown() only wait
for that domain. But since there apparently are no async shutdown
tasks, we can just revert the waiting.
Signed-off-by: Roland Dreier <roland@purestorage.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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We want the fixes in here.
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The x86 CPU feature modalias handling existed before it was reimplemented
generically. This patch aligns the x86 handling so that it
(a) reuses some more code that is now generic;
(b) uses the generic format for the modalias module metadata entry, i.e., it
now uses 'cpu:type:x86,venVVVVfamFFFFmodMMMM:feature:,XXXX,YYYY' instead of
the 'x86cpu:vendor:VVVV:family:FFFF:model:MMMM:feature:,XXXX,YYYY' that was
used before.
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Acked-by: H. Peter Anvin <hpa@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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This patch adds support for advertising optional CPU features over udev
using the modalias, and for declaring compatibility with/dependency upon
such a feature in a module.
The mapping between feature numbers and actual features should be provided
by the architecture in a file called <asm/cpufeature.h> which exports the
following functions/macros:
- cpu_feature(FEAT), a preprocessor macro that maps token FEAT to a
numeric index;
- bool cpu_have_feature(n), returning whether this CPU has support for
feature #n;
- MAX_CPU_FEATURES, an upper bound for 'n' in the previous function.
The feature can then be enabled by setting CONFIG_GENERIC_CPU_AUTOPROBE
for the architecture.
For instance, a module that registers its module init function using
module_cpu_feature_match(FEAT_X, module_init_function)
will be probed automatically when the CPU's support for the 'FEAT_X'
feature is advertised over udev, and will only allow the module to be
loaded by hand if the 'FEAT_X' feature is supported.
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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We want those fixes here for testing and development.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Function create_syslog_header() is defined as static, so it should
not be exported.
Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Allow the scheduler to select the most appropriate CPU for running the
firmware load timeout routine and delayed routine for firmware unload.
This extends idle residency times and conserves power.
This functionality is enabled when CONFIG_WQ_POWER_EFFICIENT is selected.
Cc: Ming Lei <ming.lei@canonical.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Shaibal Dutta <shaibal.dutta@broadcom.com>
[zoran.markovic@linaro.org: Rebased to latest kernel, added commit message.
Fixed code alignment.]
Signed-off-by: Zoran Markovic <zoran.markovic@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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so, we need give a protection and return a error value.
[ 7341.474236] [drm:do_intel_finish_page_flip] *ERROR* invalid or inactive unpin_work!
[ 7341.494464] atomisp-css2400b0_v21 0000:00:03.0: unhandled css stored event: 0x20
[ 7341.503627] vmap allocation for size 208896 failed: use vmalloc=<size> to increase size.<=================== map failed
[ 7341.507135] [drm:do_intel_finish_page_flip] *ERROR* invalid or inactive unpin_work!
[ 7341.503848] BUG: unable to handle kernel NULL pointer dereference at (null)
[ 7341.520394] IP: [<c18f5c1b>] sst_load_all_modules_elf+0x1bb/0x850
[ 7341.527216] *pdpt = 0000000030dfe001 *pde = 0000000000000000
[ 7341.533640] Oops: 0000 [#1] PREEMPT SMP
[ 7341.540360] [drm:do_intel_finish_page_flip] *ERROR* invalid or inactive unpin_work!
[ 7341.538037] Modules linked in: atomisp_css2400b0_v21 lm3554 ov2722 imx1x5 atmel_mxt_ts vxd392 videobuf_vmalloc videobuf_core lm_dump(O) bcm_bt_lpm hdmi_audio bcm4334x(O)
[ 7341.563531] CPU: 1 PID: 525 Comm: mediaserver Tainted: G W O 3.10.20-262518-ga83c053 #1
[ 7341.573253] task: f0994ec0 ti: f09f0000 task.ti: f09f0000
[ 7341.579284] EIP: 0060:[<c18f5c1b>] EFLAGS: 00010246 CPU: 1
[ 7341.585415] EIP is at sst_load_all_modules_elf+0x1bb/0x850
[ 7341.591541] EAX: 00000000 EBX: e3595ba0 ECX: 00000000 EDX: 00031c1c
[ 7341.598541] ESI: e04a0000 EDI: 00000000 EBP: f09f1d80 ESP: f09f1cf4
[ 7341.605542] DS: 007b ES: 007b FS: 00d8 GS: 003b SS: 0068
[ 7341.611573] CR0: 80050033 CR2: 00000000 CR3: 30db4000 CR4: 001007f0
[ 7341.618573] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
[ 7341.625575] DR6: ffff0ff0 DR7: 00000400
[ 7341.629856] Stack:
[ 7341.632097] f09f1d57 00000019 c1d656d7 c1d658d3 c1d56409 00000f28 c1d64af9 18000103
[ 7341.640766] 01000001 00080000 c1f910a0 f326f4c8 00000034 f326f520 00000002 e04a02bc
[ 7341.649465] 00000001 f326e014 c1f910b0 e04a0000 c0080100 00031c1c e3595ba0 c0080100
[ 7341.658149] Call Trace:
[ 7341.660888] [<c18f6308>] sst_post_download_byt+0x58/0xb0
[ 7341.666925] [<c18f4fbc>] sst_load_fw+0xdc/0x510
[ 7341.672086] [<c1a7b2c0>] ? __mutex_lock_slowpath+0x250/0x370
[ 7341.678507] [<c1a80e05>] ? sub_preempt_count+0x55/0xe0
[ 7341.684346] [<c18f1294>] sst_download_fw+0x14/0x60
[ 7341.689796] [<c1a7b403>] ? mutex_lock+0x23/0x30
[ 7341.694954] [<c18f191c>] intel_sst_check_device+0x6c/0x120
[ 7341.701181] [<c18f1d08>] sst_set_generic_params+0x1b8/0x4a0
[ 7341.707504] [<c1a80e05>] ? sub_preempt_count+0x55/0xe0
[ 7341.713341] [<c1a80e05>] ? sub_preempt_count+0x55/0xe0
[ 7341.719178] [<c1a7b2c0>] ? __mutex_lock_slowpath+0x250/0x370
[ 7341.725600] [<c1320d84>] ? __kmalloc_track_caller+0xe4/0x1d0
[ 7341.732022] [<c18e35f5>] sst_set_mixer_param+0x25/0x40
[ 7341.737859] [<c18e3853>] lpe_mixer_ihf_set+0xb3/0x160
[ 7341.743602] [<c1855b99>] snd_ctl_ioctl+0xa89/0xb40
[ 7341.749052] [<c1331e65>] ? path_openat+0xa5/0x3d0
[ 7341.754409] [<c1447857>] ? avc_has_perm_flags+0xc7/0x170
[ 7341.760441] [<c1855110>] ? snd_ctl_elem_add_user+0x540/0x540
[ 7341.766862] [<c1334047>] do_vfs_ioctl+0x77/0x5e0
[ 7341.772117] [<c144842a>] ? inode_has_perm.isra.42.constprop.79+0x3a/0x50
[ 7341.779705] [<c14490a0>] ? file_has_perm+0xa0/0xb0
[ 7341.785155] [<c14493b8>] ? selinux_file_ioctl+0x48/0xe0
[ 7341.791090] [<c1334628>] SyS_ioctl+0x78/0x90
[ 7341.795958] [<c1a7dde8>] syscall_call+0x7/0xb
[ 7341.800925] [<c1a70000>] ? mm_fault_error+0x13c/0x198
Signed-off-by: zhang jun <jun.zhang@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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None of these files are actually using any __init type directives
and hence don't need to include <linux/init.h>. Most are just a
left over from __devinit and __cpuinit removal, or simply due to
code getting copied from one driver to the next.
Cc: Len Brown <len.brown@intel.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Acked-by: Pavel Machek <pavel@ucw.cz>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Mark Brown <broonie@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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The acpi_dev_pm_attach/_detach functions perform their own checks to
ensure the device has an ACPI companion. It is not necessary for the
caller to do so.
This mirrors what other busses with ACPI dev PM support do (i2c, spi,
sdio).
Cc: Len Brown <lenb@kernel.org>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Josh Cartwright <joshc@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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All device_schedule_callback_owner() users are converted to use
device_remove_file_self(). Remove now unused
{sysfs|device}_schedule_callback_owner().
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Sometimes it's necessary to implement a node which wants to delete
nodes including itself. This isn't straightforward because of kernfs
active reference. While a file operation is in progress, an active
reference is held and kernfs_remove() waits for all such references to
drain before completing. For a self-deleting node, this is a deadlock
as kernfs_remove() ends up waiting for an active reference that itself
is sitting on top of.
This currently is worked around in the sysfs layer using
sysfs_schedule_callback() which makes such removals asynchronous.
While it works, it's rather cumbersome and inherently breaks
synchronicity of the operation - the file operation which triggered
the operation may complete before the removal is finished (or even
started) and the removal may fail asynchronously. If a removal
operation is immmediately followed by another operation which expects
the specific name to be available (e.g. removal followed by rename
onto the same name), there's no way to make the latter operation
reliable.
The thing is there's no inherent reason for this to be asynchrnous.
All that's necessary to do this synchronous is a dedicated operation
which drops its own active ref and deactivates self. This patch
implements kernfs_remove_self() and its wrappers in sysfs and driver
core. kernfs_remove_self() is to be called from one of the file
operations, drops the active ref the task is holding, removes the self
node, and restores active ref to the dead node so that the ref is
balanced afterwards. __kernfs_remove() is updated so that it takes an
early exit if the target node is already fully removed so that the
active ref restored by kernfs_remove_self() after removal doesn't
confuse the deactivation path.
This makes implementing self-deleting nodes very easy. The normal
removal path doesn't even need to be changed to use
kernfs_remove_self() for the self-deleting node. The method can
invoke kernfs_remove_self() on itself before proceeding the normal
removal path. kernfs_remove() invoked on the node by the normal
deletion path will simply be ignored.
This will replace sysfs_schedule_callback(). A subtle feature of
sysfs_schedule_callback() is that it collapses multiple invocations -
even if multiple removals are triggered, the removal callback is run
only once. An equivalent effect can be achieved by testing the return
value of kernfs_remove_self() - only the one which gets %true return
value should proceed with actual deletion. All other instances of
kernfs_remove_self() will wait till the enclosing kernfs operation
which invoked the winning instance of kernfs_remove_self() finishes
and then return %false. This trivially makes all users of
kernfs_remove_self() automatically show correct synchronous behavior
even when there are multiple concurrent operations - all "echo 1 >
delete" instances will finish only after the whole operation is
completed by one of the instances.
Note that manipulation of active ref is implemented in separate public
functions - kernfs_[un]break_active_protection().
kernfs_remove_self() is the only user at the moment but this will be
used to cater to more complex cases.
v2: For !CONFIG_SYSFS, dummy version kernfs_remove_self() was missing
and sysfs_remove_file_self() had incorrect return type. Fix it.
Reported by kbuild test bot.
v3: kernfs_[un]break_active_protection() separated out from
kernfs_remove_self() and exposed as public API.
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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dma_buf_map_attachment and dma_buf_vmap can return NULL or
ERR_PTR on a error. This encourages a common buggy pattern in
callers:
sgt = dma_buf_map_attachment(attach, DMA_BIDIRECTIONAL);
if (IS_ERR_OR_NULL(sgt))
return PTR_ERR(sgt);
This causes the caller to return 0 on an error. IS_ERR_OR_NULL
is almost always a sign of poorly-defined error handling.
This patch converts dma_buf_map_attachment to always return
ERR_PTR, and fixes the callers that incorrectly handled NULL.
There are a few more callers that were not checking for NULL
at all, which would have dereferenced a NULL pointer later.
There are also a few more callers that correctly handled NULL
and ERR_PTR differently, I left those alone but they could also
be modified to delete the NULL check.
This patch also converts dma_buf_vmap to always return NULL.
All the callers to dma_buf_vmap only check for NULL, and would
have dereferenced an ERR_PTR and panic'd if one was ever
returned. This is not consistent with the rest of the dma buf
APIs, but matches the expectations of all of the callers.
Signed-off-by: Colin Cross <ccross@android.com>
Reviewed-by: Rob Clark <robdclark@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc
Pull char/misc driver patches from Greg KH:
"Here's the big char/misc driver updates for 3.15-rc1.
Lots of various things here, including the new mcb driver subsystem.
All of these have been in linux-next for a while"
* tag 'char-misc-3.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: (118 commits)
extcon: Move OF helper function to extcon core and change function name
extcon: of: Remove unnecessary function call by using the name of device_node
extcon: gpio: Use SIMPLE_DEV_PM_OPS macro
extcon: palmas: Use SIMPLE_DEV_PM_OPS macro
mei: don't use deprecated DEFINE_PCI_DEVICE_TABLE macro
mei: amthif: fix checkpatch error
mei: client.h fix checkpatch errors
mei: use cl_dbg where appropriate
mei: fix Unnecessary space after function pointer name
mei: report consistently copy_from/to_user failures
mei: drop pr_fmt macros
mei: make me hw headers private to me hw.
mei: fix memory leak of pending write cb objects
mei: me: do not reset when less than expected data is received
drivers: mcb: Fix build error discovered by 0-day bot
cs5535-mfgpt: Simplify dependencies
spmi: pm: drop bus-level PM suspend/resume routines
spmi: pmic_arb: make selectable on ARCH_QCOM
Drivers: hv: vmbus: Increase the limit on the number of pfns we can handle
pch_phub: Report error writing MAC back to user
...
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We want these fixes in here as well.
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We want these fixes here as well.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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We need the fixes here for future mei and other patches.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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SPMI states that a slave may contain two register spaces, the Base
register space is a 5-bit byte-addressable space accessed via the
Register Read/Write and Register Zero Write command sequences, and the
Extended register space: a 16-bit byte-addressable space accessed via
the Extended Read/Write and Extended Read/Write Long command sequences.
Provide support for accessing both of these spaces, taking advantage of
the more bandwidth-efficient commands ('Register 0 Write' vs 'Register
Write', and 'Extended Register Read/Write' vs 'Extended Register
Read/Write Long') when possible.
Signed-off-by: Josh Cartwright <joshc@codeaurora.org>
Acked-by: Mark Brown <broonie@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regulator
Pull regulator updates from Mark Brown:
"This release has lots and lots of small cleanups and fixes in the
regulator subsystem, mainly cleaning up some bad patterns that got
duplicated in DT code, but otherwise very little of note outside of
the scope of the relevant drivers:
- Support for configuration of the initial state for gpio regulators
with multi-voltage support.
- Support for calling regulator_set_voltage() on fixed regulators.
- New drivers for Broadcom BCM590xx, Freescale pfuze200, Samsung
S2MPA01 & S2MPS11/4, some PWM controlled regulators found on some
ST boards and TI TPS65218"
* tag 'regulator-v3.15' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regulator: (154 commits)
regulator: aat2870: Use regulator_map_voltage_ascend
regulator: st-pwm: Convert to get_voltage_sel
regulator: Add new driver for ST's PWM controlled voltage regulators
regulator: bcm590xx: Remove **rdev from struct bcm590xx_reg
regulator: bcm590xx: Make the modalias matches the driver name
regulator: s5m8767: Convert to use regulator_[enable|disable|is_enabled]_regmap
regulator: db8500-prcmu: Set 1.8V as a fixed voltage for vsmps2
regulator: s2mps11: Add missing of_node_put
regulator: s2mps11: Use of_get_child_by_name
Documentation: mfd: s2mps11: Document support for S2MPS14
regulator: s2mps11: Add set_suspend_disable for S2MPS14
regulator: s2mps11: Add support for S2MPS14 regulators
regulator: max8660: Fix brace alignment
regulator: dbx500: use seq_puts() instead of seq_printf()
regulator: dbx500-prcmu: Silence checkpatch warnings
regulator: anatop: Remove checking control_reg in [set|get]_voltage_sel
regulator: max8952: Silence checkpatch warning
regulator: max8925: Silence checkpatch warning
regulator: max8660: Silence checkpatch warnings
regulator: arizona-ldo1: Correct default regulator init_data
...
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'regulator/topic/enable', 'regulator/topic/fan53555', 'regulator/topic/fixed', 'regulator/topic/gpio', 'regulator/topic/lp3971', 'regulator/topic/lp872x' and 'regulator/topic/max14577' into regulator-next
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This patch introduces "devm_kstrdup" API so that the
device's driver can allocate memory and copy string.
Signed-off-by: Manish Badarkhe <badarkhe.manish@gmail.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap
Pull regmap updates from Mark Brown:
"Quite a busy release for regmap this time around, the standout changes
are:
- A real implementation of regmap_multi_write() and a bypassed
version of it for use by drivers doing patch-like things with more
open coding for surrounding startup sequences.
- Support fast_io on bulk operations.
- Support split device binding and map initialisation for use by
devices required in early init (mainly system controllers).
- Fixes for some operations on maps with strides set.
- Export the value parsing operations to help generic code built on
top of the API.
- Support for MMIO regmaps with non-32 bit register sizes.
plus a few smaller fixes"
* tag 'regmap-v3.15' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap: (22 commits)
regmap: mmio: Add regmap_mmio_regbits_check.
regmap: mmio: Add support for 1/2/8 bytes wide register address.
regmap: mmio: add regmap_mmio_{regsize, count}_check.
regmap: cache: Don't attempt to sync non-writeable registers
regmap: cache: Step by stride in default sync
regmap: Fix possible sleep-in-atomic in regmap_bulk_write()
regmap: Ensure regmap_register_patch() is compatible with fast_io
regmap: irq: Set data pointer only on regmap_add_irq_chip success
regmap: Implementation for regmap_multi_reg_write
regmap: add regmap_parse_val api
mfd: arizona: Use new regmap features for manual register patch
regmap: Base regmap_register_patch on _regmap_multi_reg_write
regmap: Add bypassed version of regmap_multi_reg_write
regmap: Mark reg_defaults in regmap_multi_reg_write as const
regmap: fix coccinelle warnings
regmap: Check stride of register patch as we register it
regmap: Clean up _regmap_update_bits()
regmap: Separate regmap dev initialization
regmap: Check readable regs in _regmap_read
regmap: irq: Remove domain on exit
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'regmap/topic/lock', 'regmap/topic/mmio', 'regmap/topic/nodev', 'regmap/topic/parse-val' and 'regmap/topic/patch' into regmap-next
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This is the implementation of regmap_multi_reg_write()
There is a new capability 'can_multi_write' that device drivers
must set in order to use this multi reg write mode.
This replaces the first definition, which just defined the API.
Signed-off-by: Anthony Olech <anthony.olech.opensource@diasemi.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
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Since we now have an internal version of regmap_multi_reg_write use this
to apply the register patch.
Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
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Devices with more complex boot proceedures may occasionally apply the
register patch manual. regmap_multi_reg_write is a logical way to do so,
however the patch must be applied with cache bypass on, such that it
doesn't override any user settings. This patch adds a
regmap_multi_reg_write_bypassed function that applies a set of writes
with the bypass enabled.
Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
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There should be no need for the writes supplied to this function to be
edited by it so mark them as const.
Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
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Currently, we check the registers in the patch are aligned to the
register stride everytime we sync the cache and the first time the patch
is written out is unchecked.
This patch checks the register patch when we first register it so the
first writes are no longer unchecked and then doesn't check on
subsequent syncs as the patch will be unchanged.
Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
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In some cases, we need regmap's format parse_val function
to do be/le translation according to the bus configuration.
For example, snd_soc_bytes_put() uses regmap to write/read values,
and use cpu_to_be() directly to covert MASK into big endian. This
is a defect, and should use regmap's format function to do it according
to bus configuration.
Signed-off-by: Nenghua Cao <nhcao@marvell.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
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Create special function regmap_attach_dev
which can be called separately out of regmap_init.
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
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Fix the support for 1/2/8 bytes wide register address checking.
Signed-off-by: Xiubo Li <Li.Xiubo@freescale.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
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Since regmap core and mmio have already support for 1/2/8 bytes wide values,
so adds support for 1/2/8 bytes wide registers address.
Signed-off-by: Xiubo Li <Li.Xiubo@freescale.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
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Signed-off-by: Xiubo Li <Li.Xiubo@freescale.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
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regmap deploys the spinlock for the protection when set up in fast_io
mode. This may lead to sleep-in-atomic by memory allocation with
GFP_KERNEL in regmap_bulk_write(). This patch fixes it by moving the
allocation out of the lock.
[Fix excessively large locked region -- broonie]
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Mark Brown <broonie@linaro.org>
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