| Age | Commit message (Collapse) | Author | Files | Lines |
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This fixes a sparse warning, and is a good idea given that the
devtmpfs_init() prototype is in this file.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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This reverts commit bc8ce4 (regmap: don't corrupt work buffer in
_regmap_raw_write()) since it turns out that it can cause issues when
taken in isolation from the other changes in -next that lead to its
discovery. On the basis that nobody noticed the problems for quite some
time without that subsequent work let's drop it from v3.9.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
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Some drivers want to tell userspace what uid and gid should be used for
their device nodes, so allow that information to percolate through the
driver core to userspace in order to make this happen. This means that
some systems (i.e. Android and friends) will not need to even run a
udev-like daemon for their device node manager and can just rely in
devtmpfs fully, reducing their footprint even more.
Signed-off-by: Kay Sievers <kay@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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commit dde8437 (PM / OPP: RCU reclaim) introduced rcu_head for
struct opp. This aids freeing using kfree_rcu. However, we missed
adding documentation for the same. This generates kernel doc warning:
Warning(drivers/base/power/opp.c:70): No description found for
parameter 'head'
Add documentation as appropriate.
[rjw: Changelog]
Signed-off-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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Fix format specifier in dev_dbg and suppress the following warning
drivers/base/regmap/regcache.c: In function
‘regcache_sync_block_raw_flush’:
drivers/base/regmap/regcache.c:593:2: warning: format ‘%d’ expects
argument of type ‘int’, but argument 4 has type ‘size_t’ [-Wformat]
Signed-off-by: Stratos Karafotis <stratosk@semaphore.gr>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
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regcache_sync_block_raw is used only in this file. Hence make it static.
Silences the following warning:
drivers/base/regmap/regcache.c:608:5: warning:
symbol 'regcache_sync_block_raw' was not declared. Should it be static?
Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
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git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
Pull ACPI and power management fixes from Rafael Wysocki:
- Revert of a recent cpuidle change that caused Nehalem machines to
hang on boot from Alex Shi.
- USB power management fix addressing a crash in the port device
object's release routine from Rafael J Wysocki.
- Device PM QoS fix for a potential deadlock related to sysfs interface
from Rafael J Wysocki.
- Fix for a cpufreq crash when the /cpus Device Tree node is missing
from Paolo Pisati.
- Fix for a build issue on ia64 related to the Boot Graphics Resource
Table (BGRT) from Tony Luck.
- Two fixes for ACPI handles being set incorrectly for device objects
that don't correspond to any ACPI namespace nodes in the I2C and SPI
subsystems from Rafael J Wysocki.
- Fix for compiler warnings related to CONFIG_PM_DEVFREQ being unset
from Rajagopal Venkat.
- Fix for a symbol definition typo in cpufreq_governor.h from Borislav
Petkov.
* tag 'pm+acpi-3.9-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
ACPI / BGRT: Don't let users configure BGRT on non X86 systems
cpuidle / ACPI: recover percpu ACPI processor cstate
ACPI / I2C: Use parent's ACPI_HANDLE() in acpi_i2c_register_devices()
cpufreq: Correct header guards typo
ACPI / SPI: Use parent's ACPI_HANDLE() in acpi_register_spi_devices()
cpufreq: check OF node /cpus presence before dereferencing it
PM / devfreq: Fix compiler warnings for CONFIG_PM_DEVFREQ unset
PM / QoS: Avoid possible deadlock related to sysfs access
USB / PM: Don't try to hide PM QoS flags from usb_port_device_release()
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commit eca4549f57 "sysfs: Add crash_notes_size to export percpu
note size" adds a printk that outputs a size_t value as %lu
when it should be %zu, resulting in this warning.
drivers/base/cpu.c: In function 'show_crash_notes_size':
drivers/base/cpu.c:142:2: warning: format '%lu' expects argument of type 'long unsigned int', but argument 3 has type 'unsigned int' [-Wformat=]
Reported-by: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Zhang Yanfei <zhangyanfei@cn.fujitsu.com>
Cc: Simon Horman <horms@verge.net.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Writeback conversion to workqueue will be based on top of wq/for-3.10
branch to take advantage of custom attrs and NUMA support for unbound
workqueues. Mainline currently contains two commits which result in
non-trivial merge conflicts with wq/for-3.10 and because
block/for-3.10/core is based on v3.9-rc3 which contains one of the
conflicting commits, we need a pre-merge-window merge anyway. Let's
pull v3.9-rc5 into wq/for-3.10 so that the block tree doesn't suffer
from workqueue merge conflicts.
The two conflicts and their resolutions:
* e68035fb65 ("workqueue: convert to idr_alloc()") in mainline changes
worker_pool_assign_id() to use idr_alloc() instead of the old idr
interface. worker_pool_assign_id() goes through multiple locking
changes in wq/for-3.10 causing the following conflict.
static int worker_pool_assign_id(struct worker_pool *pool)
{
int ret;
<<<<<<< HEAD
lockdep_assert_held(&wq_pool_mutex);
do {
if (!idr_pre_get(&worker_pool_idr, GFP_KERNEL))
return -ENOMEM;
ret = idr_get_new(&worker_pool_idr, pool, &pool->id);
} while (ret == -EAGAIN);
=======
mutex_lock(&worker_pool_idr_mutex);
ret = idr_alloc(&worker_pool_idr, pool, 0, 0, GFP_KERNEL);
if (ret >= 0)
pool->id = ret;
mutex_unlock(&worker_pool_idr_mutex);
>>>>>>> c67bf5361e7e66a0ff1f4caf95f89347d55dfb89
return ret < 0 ? ret : 0;
}
We want locking from the former and idr_alloc() usage from the
latter, which can be combined to the following.
static int worker_pool_assign_id(struct worker_pool *pool)
{
int ret;
lockdep_assert_held(&wq_pool_mutex);
ret = idr_alloc(&worker_pool_idr, pool, 0, 0, GFP_KERNEL);
if (ret >= 0) {
pool->id = ret;
return 0;
}
return ret;
}
* eb2834285c ("workqueue: fix possible pool stall bug in
wq_unbind_fn()") updated wq_unbind_fn() such that it has single
larger for_each_std_worker_pool() loop instead of two separate loops
with a schedule() call inbetween. wq/for-3.10 renamed
pool->assoc_mutex to pool->manager_mutex causing the following
conflict (earlier function body and comments omitted for brevity).
static void wq_unbind_fn(struct work_struct *work)
{
...
spin_unlock_irq(&pool->lock);
<<<<<<< HEAD
mutex_unlock(&pool->manager_mutex);
}
=======
mutex_unlock(&pool->assoc_mutex);
>>>>>>> c67bf5361e7e66a0ff1f4caf95f89347d55dfb89
schedule();
<<<<<<< HEAD
for_each_cpu_worker_pool(pool, cpu)
=======
>>>>>>> c67bf5361e7e66a0ff1f4caf95f89347d55dfb89
atomic_set(&pool->nr_running, 0);
spin_lock_irq(&pool->lock);
wake_up_worker(pool);
spin_unlock_irq(&pool->lock);
}
}
The resolution is mostly trivial. We want the control flow of the
latter with the rename of the former.
static void wq_unbind_fn(struct work_struct *work)
{
...
spin_unlock_irq(&pool->lock);
mutex_unlock(&pool->manager_mutex);
schedule();
atomic_set(&pool->nr_running, 0);
spin_lock_irq(&pool->lock);
wake_up_worker(pool);
spin_unlock_irq(&pool->lock);
}
}
Signed-off-by: Tejun Heo <tj@kernel.org>
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Commit b81ea1b (PM / QoS: Fix concurrency issues and memory leaks in
device PM QoS) put calls to pm_qos_sysfs_add_latency(),
pm_qos_sysfs_add_flags(), pm_qos_sysfs_remove_latency(), and
pm_qos_sysfs_remove_flags() under dev_pm_qos_mtx, which was a
mistake, because it may lead to deadlocks in some situations.
For example, if pm_qos_remote_wakeup_store() is run in parallel
with dev_pm_qos_constraints_destroy(), they may deadlock in the
following way:
======================================================
[ INFO: possible circular locking dependency detected ]
3.9.0-rc4-next-20130328-sasha-00014-g91a3267 #319 Tainted: G W
-------------------------------------------------------
trinity-child6/12371 is trying to acquire lock:
(s_active#54){++++.+}, at: [<ffffffff81301631>] sysfs_addrm_finish+0x31/0x60
but task is already holding lock:
(dev_pm_qos_mtx){+.+.+.}, at: [<ffffffff81f07cc3>] dev_pm_qos_constraints_destroy+0x23/0x250
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #1 (dev_pm_qos_mtx){+.+.+.}:
[<ffffffff811811da>] lock_acquire+0x1aa/0x240
[<ffffffff83dab809>] __mutex_lock_common+0x59/0x5e0
[<ffffffff83dabebf>] mutex_lock_nested+0x3f/0x50
[<ffffffff81f07f2f>] dev_pm_qos_update_flags+0x3f/0xc0
[<ffffffff81f05f4f>] pm_qos_remote_wakeup_store+0x3f/0x70
[<ffffffff81efbb43>] dev_attr_store+0x13/0x20
[<ffffffff812ffdaa>] sysfs_write_file+0xfa/0x150
[<ffffffff8127f2c1>] __kernel_write+0x81/0x150
[<ffffffff812afc2d>] write_pipe_buf+0x4d/0x80
[<ffffffff812af57c>] splice_from_pipe_feed+0x7c/0x120
[<ffffffff812afa25>] __splice_from_pipe+0x45/0x80
[<ffffffff812b14fc>] splice_from_pipe+0x4c/0x70
[<ffffffff812b1538>] default_file_splice_write+0x18/0x30
[<ffffffff812afae3>] do_splice_from+0x83/0xb0
[<ffffffff812afb2e>] direct_splice_actor+0x1e/0x20
[<ffffffff812b0277>] splice_direct_to_actor+0xe7/0x200
[<ffffffff812b15bc>] do_splice_direct+0x4c/0x70
[<ffffffff8127eda9>] do_sendfile+0x169/0x300
[<ffffffff8127ff94>] SyS_sendfile64+0x64/0xb0
[<ffffffff83db7d18>] tracesys+0xe1/0xe6
-> #0 (s_active#54){++++.+}:
[<ffffffff811800cf>] __lock_acquire+0x15bf/0x1e50
[<ffffffff811811da>] lock_acquire+0x1aa/0x240
[<ffffffff81300aa2>] sysfs_deactivate+0x122/0x1a0
[<ffffffff81301631>] sysfs_addrm_finish+0x31/0x60
[<ffffffff812ff77f>] sysfs_hash_and_remove+0x7f/0xb0
[<ffffffff813035a1>] sysfs_unmerge_group+0x51/0x70
[<ffffffff81f068f4>] pm_qos_sysfs_remove_flags+0x14/0x20
[<ffffffff81f07490>] __dev_pm_qos_hide_flags+0x30/0x70
[<ffffffff81f07cd5>] dev_pm_qos_constraints_destroy+0x35/0x250
[<ffffffff81f06931>] dpm_sysfs_remove+0x11/0x50
[<ffffffff81efcf6f>] device_del+0x3f/0x1b0
[<ffffffff81efd128>] device_unregister+0x48/0x60
[<ffffffff82d4083c>] usb_hub_remove_port_device+0x1c/0x20
[<ffffffff82d2a9cd>] hub_disconnect+0xdd/0x160
[<ffffffff82d36ab7>] usb_unbind_interface+0x67/0x170
[<ffffffff81f001a7>] __device_release_driver+0x87/0xe0
[<ffffffff81f00559>] device_release_driver+0x29/0x40
[<ffffffff81effc58>] bus_remove_device+0x148/0x160
[<ffffffff81efd07f>] device_del+0x14f/0x1b0
[<ffffffff82d344f9>] usb_disable_device+0xf9/0x280
[<ffffffff82d34ff8>] usb_set_configuration+0x268/0x840
[<ffffffff82d3a7fc>] usb_remove_store+0x4c/0x80
[<ffffffff81efbb43>] dev_attr_store+0x13/0x20
[<ffffffff812ffdaa>] sysfs_write_file+0xfa/0x150
[<ffffffff8127f71d>] do_loop_readv_writev+0x4d/0x90
[<ffffffff8127f999>] do_readv_writev+0xf9/0x1e0
[<ffffffff8127faba>] vfs_writev+0x3a/0x60
[<ffffffff8127fc60>] SyS_writev+0x50/0xd0
[<ffffffff83db7d18>] tracesys+0xe1/0xe6
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(dev_pm_qos_mtx);
lock(s_active#54);
lock(dev_pm_qos_mtx);
lock(s_active#54);
*** DEADLOCK ***
To avoid that, remove the calls to functions mentioned above from
under dev_pm_qos_mtx and introduce a separate lock to prevent races
between functions that add or remove device PM QoS sysfs attributes
from happening.
Reported-by: Sasha Levin <sasha.levin@oracle.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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When syncing blocks of data using raw writes combine the writes into a
single block write, saving us bus overhead for setup, addressing and
teardown.
Currently the block write is done unconditionally as it is expected that
hardware which has a register format which can support raw writes will
support auto incrementing writes, this decision may need to be revised in
future.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Reviewed-by: Dimitris Papastamos <dp@opensource.wolfsonmicro.com>
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For code clarity after implementing block writes split out the raw and
non-raw I/O sync implementations.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Reviewed-by: Dimitris Papastamos <dp@opensource.wolfsonmicro.com>
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The idea of holding blocks of registers in device format is shared between
at least rbtree and lzo cache formats so split out the loop that does the
sync from the rbtree code so optimisations on it can be reused.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Reviewed-by: Dimitris Papastamos <dp@opensource.wolfsonmicro.com>
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The idea of maintaining a bitmap of present registers is something that
can usefully be used by other cache types that maintain blocks of cached
registers so move the code out of the rbtree cache and into the generic
regcache code.
Refactor the interface slightly as we go to wrap the set bit and enlarge
bitmap operations (since we never do one without the other) and make it
more robust for reads of uncached registers by bounds checking before we
look at the bitmap.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Reviewed-by: Dimitris Papastamos <dp@opensource.wolfsonmicro.com>
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For percpu notes, we are exporting only address and not size. So
the userspace tool kexec-tools is putting an upper limit of 1024
and putting the value in p_memsz and p_filesz fields. So the patch
add the new sysfile crash_notes_size to export the exact percpu
note size and let the kexec-tools parse it intead of using 1024.
The idea came from Vivek Goyal. And a later patch will be sent to
kexec-tools to let it parse the size.
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Zhang Yanfei <zhangyanfei@cn.fujitsu.com>
Acked-by: Simon Horman <horms@verge.net.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Signed-off-by: Fabio Porcedda <fabio.porcedda@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Add documentation that platform_driver_probe() is incompatible with
deferred probing.
Signed-off-by: Fabio Porcedda <fabio.porcedda@gmail.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Let's only write once...
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
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This will bring no meaningful benefit by itself, it is done as a separate
commit to aid bisection if there are problems with the following commits
adding support for coalescing adjacent writes.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
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Mainly useful internally but exported since this is a public API that's
being checked for.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
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Provide a helper to do the size based index into a block of registers and
use it when reading a value.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
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This patch aims to bring down the average number of nodes
in the rbtree cache and increase the average number of registers
per node. This should improve general lookup and traversal times.
This is achieved by setting the minimum size of a block within the
rbnode to the size of the rbnode itself. This will essentially
cache possibly non-existent registers so to combat this scenario,
we keep a separate bitmap in memory which keeps track of which register
exists. The memory overhead of this change is likely in the order of
~5-10%, possibly less depending on the register file layout. On my test
system with a bitmap of ~4300 bits and a relatively sparse register
layout, the memory requirements for the entire cache did not increase
(the cutting down of nodes which was about 50% of the original number
compensated the situation).
A second patch that can be built on top of this can look at the
ratio `sizeof(*rbnode) / map->cache_word_size' in order to suitably
adjust the block length of each block.
Signed-off-by: Dimitris Papastamos <dp@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
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This allows the cache to sync values directly to the device when stored
in native format and also allows asynchronous I/O.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
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Don't grind to a screaming halt, just generate a warning.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
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_regmap_raw_write() contains code to call regcache_write() to write
values to the cache. That code calls memcpy() to copy the value data to
the start of the work_buf. However, at least when _regmap_raw_write() is
called from _regmap_bus_raw_write(), the value data is in the work_buf,
and this memcpy() operation may over-write part of that value data,
depending on the value of reg_bytes + pad_bytes. At least when using
reg_bytes==1 and pad_bytes==0, corruption of the value data does occur.
To solve this, remove the memcpy() operation, and modify the subsequent
.parse_val() call to parse the original value buffer directly.
At least in the case of 8-bit register address and 16-bit values, and
writes of single registers at a time, this memcpy-then-parse combination
used to cancel each-other out; for a work-buffer containing xx 89 03,
the memcpy changed it to 89 03 03, and the parse_val changed it back to
89 89 03, thus leaving the value uncorrupted. This appears completely
accidental though. Since commit 8a819ff "regmap: core: Split out in
place value parsing", .parse_val only returns the parsed value, and does
not modify the buffer, and hence does not (accidentally) undo the
corruption caused by memcpy(). This caused bogus values to get written
to HW, thus preventing e.g. audio playback on systems with a WM8903
CODEC. This patch fixes that.
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
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Display the name for the chip rather than just the primary IRQ so it is
clearer what exactly has failed.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
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Merge with mainline to bring in module_platform_driver_probe() and
devm_ioremap_resource().
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Whenever a struct device_attribute is registered
with mismatched permissions - read permission without
a show routine or write permission without store
routine - we will issue a big warning so we catch
those early enough.
Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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The last register block, which falls into the specified range, is not handled
correctly. The formula which calculates the number of register which should be
synced is inverse (and off by one). E.g. if all registers in that block should
be synced only one is synced, and if only one should be synced all (but one) are
synced. To calculate the number of registers that need to be synced we need to
subtract the number of the first register in the block from the max register
number and add one. This patch updates the code accordingly.
The issue was introduced in commit ac8d91c ("regmap: Supply ranges to the sync
operations").
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Cc: stable@vger.kernel.org
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ca22e56d (driver-core: implement 'sysdev' functionality for regular
devices and buses) has introduced bus_register macro with a static
key to distinguish different subsys mutex classes.
This however doesn't work for different subsys which use a common
registering function. One example is subsys_system_register (and
mce_device and cpu_device).
In the end this leads to the following lockdep splat:
[ 207.271924] ======================================================
[ 207.271932] [ INFO: possible circular locking dependency detected ]
[ 207.271942] 3.9.0-rc1-0.7-default+ #34 Not tainted
[ 207.271948] -------------------------------------------------------
[ 207.271957] bash/10493 is trying to acquire lock:
[ 207.271963] (subsys mutex){+.+.+.}, at: [<ffffffff8134af27>] bus_remove_device+0x37/0x1c0
[ 207.271987]
[ 207.271987] but task is already holding lock:
[ 207.271995] (cpu_hotplug.lock){+.+.+.}, at: [<ffffffff81046ccf>] cpu_hotplug_begin+0x2f/0x60
[ 207.272012]
[ 207.272012] which lock already depends on the new lock.
[ 207.272012]
[ 207.272023]
[ 207.272023] the existing dependency chain (in reverse order) is:
[ 207.272033]
[ 207.272033] -> #4 (cpu_hotplug.lock){+.+.+.}:
[ 207.272044] [<ffffffff810ae329>] lock_acquire+0xe9/0x120
[ 207.272056] [<ffffffff814ad807>] mutex_lock_nested+0x37/0x360
[ 207.272069] [<ffffffff81046ba9>] get_online_cpus+0x29/0x40
[ 207.272082] [<ffffffff81185210>] drain_all_stock+0x30/0x150
[ 207.272094] [<ffffffff811853da>] mem_cgroup_reclaim+0xaa/0xe0
[ 207.272104] [<ffffffff8118775e>] __mem_cgroup_try_charge+0x51e/0xcf0
[ 207.272114] [<ffffffff81188486>] mem_cgroup_charge_common+0x36/0x60
[ 207.272125] [<ffffffff811884da>] mem_cgroup_newpage_charge+0x2a/0x30
[ 207.272135] [<ffffffff81150531>] do_wp_page+0x231/0x830
[ 207.272147] [<ffffffff8115151e>] handle_pte_fault+0x19e/0x8d0
[ 207.272157] [<ffffffff81151da8>] handle_mm_fault+0x158/0x1e0
[ 207.272166] [<ffffffff814b6153>] do_page_fault+0x2a3/0x4e0
[ 207.272178] [<ffffffff814b2578>] page_fault+0x28/0x30
[ 207.272189]
[ 207.272189] -> #3 (&mm->mmap_sem){++++++}:
[ 207.272199] [<ffffffff810ae329>] lock_acquire+0xe9/0x120
[ 207.272208] [<ffffffff8114c5ad>] might_fault+0x6d/0x90
[ 207.272218] [<ffffffff811a11e3>] filldir64+0xb3/0x120
[ 207.272229] [<ffffffffa013fc19>] call_filldir+0x89/0x130 [ext3]
[ 207.272248] [<ffffffffa0140377>] ext3_readdir+0x6b7/0x7e0 [ext3]
[ 207.272263] [<ffffffff811a1519>] vfs_readdir+0xa9/0xc0
[ 207.272273] [<ffffffff811a15cb>] sys_getdents64+0x9b/0x110
[ 207.272284] [<ffffffff814bb599>] system_call_fastpath+0x16/0x1b
[ 207.272296]
[ 207.272296] -> #2 (&type->i_mutex_dir_key#3){+.+.+.}:
[ 207.272309] [<ffffffff810ae329>] lock_acquire+0xe9/0x120
[ 207.272319] [<ffffffff814ad807>] mutex_lock_nested+0x37/0x360
[ 207.272329] [<ffffffff8119c254>] link_path_walk+0x6f4/0x9a0
[ 207.272339] [<ffffffff8119e7fa>] path_openat+0xba/0x470
[ 207.272349] [<ffffffff8119ecf8>] do_filp_open+0x48/0xa0
[ 207.272358] [<ffffffff8118d81c>] file_open_name+0xdc/0x110
[ 207.272369] [<ffffffff8118d885>] filp_open+0x35/0x40
[ 207.272378] [<ffffffff8135c76e>] _request_firmware+0x52e/0xb20
[ 207.272389] [<ffffffff8135cdd6>] request_firmware+0x16/0x20
[ 207.272399] [<ffffffffa03bdb91>] request_microcode_fw+0x61/0xd0 [microcode]
[ 207.272416] [<ffffffffa03bd554>] microcode_init_cpu+0x104/0x150 [microcode]
[ 207.272431] [<ffffffffa03bd61c>] mc_device_add+0x7c/0xb0 [microcode]
[ 207.272444] [<ffffffff8134a419>] subsys_interface_register+0xc9/0x100
[ 207.272457] [<ffffffffa04fc0f4>] 0xffffffffa04fc0f4
[ 207.272472] [<ffffffff81000202>] do_one_initcall+0x42/0x180
[ 207.272485] [<ffffffff810bbeff>] load_module+0x19df/0x1b70
[ 207.272499] [<ffffffff810bc376>] sys_init_module+0xe6/0x130
[ 207.272511] [<ffffffff814bb599>] system_call_fastpath+0x16/0x1b
[ 207.272523]
[ 207.272523] -> #1 (umhelper_sem){++++.+}:
[ 207.272537] [<ffffffff810ae329>] lock_acquire+0xe9/0x120
[ 207.272548] [<ffffffff814ae9c4>] down_read+0x34/0x50
[ 207.272559] [<ffffffff81062bff>] usermodehelper_read_trylock+0x4f/0x100
[ 207.272575] [<ffffffff8135c7dd>] _request_firmware+0x59d/0xb20
[ 207.272587] [<ffffffff8135cdd6>] request_firmware+0x16/0x20
[ 207.272599] [<ffffffffa03bdb91>] request_microcode_fw+0x61/0xd0 [microcode]
[ 207.272613] [<ffffffffa03bd554>] microcode_init_cpu+0x104/0x150 [microcode]
[ 207.272627] [<ffffffffa03bd61c>] mc_device_add+0x7c/0xb0 [microcode]
[ 207.272641] [<ffffffff8134a419>] subsys_interface_register+0xc9/0x100
[ 207.272654] [<ffffffffa04fc0f4>] 0xffffffffa04fc0f4
[ 207.272666] [<ffffffff81000202>] do_one_initcall+0x42/0x180
[ 207.272678] [<ffffffff810bbeff>] load_module+0x19df/0x1b70
[ 207.272690] [<ffffffff810bc376>] sys_init_module+0xe6/0x130
[ 207.272702] [<ffffffff814bb599>] system_call_fastpath+0x16/0x1b
[ 207.272715]
[ 207.272715] -> #0 (subsys mutex){+.+.+.}:
[ 207.272729] [<ffffffff810ae002>] __lock_acquire+0x13b2/0x15f0
[ 207.272740] [<ffffffff810ae329>] lock_acquire+0xe9/0x120
[ 207.272751] [<ffffffff814ad807>] mutex_lock_nested+0x37/0x360
[ 207.272763] [<ffffffff8134af27>] bus_remove_device+0x37/0x1c0
[ 207.272775] [<ffffffff81349114>] device_del+0x134/0x1f0
[ 207.272786] [<ffffffff813491f2>] device_unregister+0x22/0x60
[ 207.272798] [<ffffffff814a24ea>] mce_cpu_callback+0x15e/0x1ad
[ 207.272812] [<ffffffff814b6402>] notifier_call_chain+0x72/0x130
[ 207.272824] [<ffffffff81073d6e>] __raw_notifier_call_chain+0xe/0x10
[ 207.272839] [<ffffffff81498f76>] _cpu_down+0x1d6/0x350
[ 207.272851] [<ffffffff81499130>] cpu_down+0x40/0x60
[ 207.272862] [<ffffffff8149cc55>] store_online+0x75/0xe0
[ 207.272874] [<ffffffff813474a0>] dev_attr_store+0x20/0x30
[ 207.272886] [<ffffffff812090d9>] sysfs_write_file+0xd9/0x150
[ 207.272900] [<ffffffff8118e10b>] vfs_write+0xcb/0x130
[ 207.272911] [<ffffffff8118e924>] sys_write+0x64/0xa0
[ 207.272923] [<ffffffff814bb599>] system_call_fastpath+0x16/0x1b
[ 207.272936]
[ 207.272936] other info that might help us debug this:
[ 207.272936]
[ 207.272952] Chain exists of:
[ 207.272952] subsys mutex --> &mm->mmap_sem --> cpu_hotplug.lock
[ 207.272952]
[ 207.272973] Possible unsafe locking scenario:
[ 207.272973]
[ 207.272984] CPU0 CPU1
[ 207.272992] ---- ----
[ 207.273000] lock(cpu_hotplug.lock);
[ 207.273009] lock(&mm->mmap_sem);
[ 207.273020] lock(cpu_hotplug.lock);
[ 207.273031] lock(subsys mutex);
[ 207.273040]
[ 207.273040] *** DEADLOCK ***
[ 207.273040]
[ 207.273055] 5 locks held by bash/10493:
[ 207.273062] #0: (&buffer->mutex){+.+.+.}, at: [<ffffffff81209049>] sysfs_write_file+0x49/0x150
[ 207.273080] #1: (s_active#150){.+.+.+}, at: [<ffffffff812090c2>] sysfs_write_file+0xc2/0x150
[ 207.273099] #2: (x86_cpu_hotplug_driver_mutex){+.+.+.}, at: [<ffffffff81027557>] cpu_hotplug_driver_lock+0x17/0x20
[ 207.273121] #3: (cpu_add_remove_lock){+.+.+.}, at: [<ffffffff8149911c>] cpu_down+0x2c/0x60
[ 207.273140] #4: (cpu_hotplug.lock){+.+.+.}, at: [<ffffffff81046ccf>] cpu_hotplug_begin+0x2f/0x60
[ 207.273158]
[ 207.273158] stack backtrace:
[ 207.273170] Pid: 10493, comm: bash Not tainted 3.9.0-rc1-0.7-default+ #34
[ 207.273180] Call Trace:
[ 207.273192] [<ffffffff810ab373>] print_circular_bug+0x223/0x310
[ 207.273204] [<ffffffff810ae002>] __lock_acquire+0x13b2/0x15f0
[ 207.273216] [<ffffffff812086b0>] ? sysfs_hash_and_remove+0x60/0xc0
[ 207.273227] [<ffffffff810ae329>] lock_acquire+0xe9/0x120
[ 207.273239] [<ffffffff8134af27>] ? bus_remove_device+0x37/0x1c0
[ 207.273251] [<ffffffff814ad807>] mutex_lock_nested+0x37/0x360
[ 207.273263] [<ffffffff8134af27>] ? bus_remove_device+0x37/0x1c0
[ 207.273274] [<ffffffff812086b0>] ? sysfs_hash_and_remove+0x60/0xc0
[ 207.273286] [<ffffffff8134af27>] bus_remove_device+0x37/0x1c0
[ 207.273298] [<ffffffff81349114>] device_del+0x134/0x1f0
[ 207.273309] [<ffffffff813491f2>] device_unregister+0x22/0x60
[ 207.273321] [<ffffffff814a24ea>] mce_cpu_callback+0x15e/0x1ad
[ 207.273332] [<ffffffff814b6402>] notifier_call_chain+0x72/0x130
[ 207.273344] [<ffffffff81073d6e>] __raw_notifier_call_chain+0xe/0x10
[ 207.273356] [<ffffffff81498f76>] _cpu_down+0x1d6/0x350
[ 207.273368] [<ffffffff81027557>] ? cpu_hotplug_driver_lock+0x17/0x20
[ 207.273380] [<ffffffff81499130>] cpu_down+0x40/0x60
[ 207.273391] [<ffffffff8149cc55>] store_online+0x75/0xe0
[ 207.273402] [<ffffffff813474a0>] dev_attr_store+0x20/0x30
[ 207.273413] [<ffffffff812090d9>] sysfs_write_file+0xd9/0x150
[ 207.273425] [<ffffffff8118e10b>] vfs_write+0xcb/0x130
[ 207.273436] [<ffffffff8118e924>] sys_write+0x64/0xa0
[ 207.273447] [<ffffffff814bb599>] system_call_fastpath+0x16/0x1b
Which reports a false possitive deadlock because it sees:
1) load_module -> subsys_interface_register -> mc_deveice_add (*) -> subsys->p->mutex -> link_path_walk -> lookup_slow -> i_mutex
2) sys_write -> _cpu_down -> cpu_hotplug_begin -> cpu_hotplug.lock -> mce_cpu_callback -> mce_device_remove(**) -> device_unregister -> bus_remove_device -> subsys mutex
3) vfs_readdir -> i_mutex -> filldir64 -> might_fault -> might_lock_read(mmap_sem) -> page_fault -> mmap_sem -> drain_all_stock -> cpu_hotplug.lock
but
1) takes cpu_subsys subsys (*) but 2) takes mce_device subsys (**) so
the deadlock is not possible AFAICS.
The fix is quite simple. We can pull the key inside bus_type structure
because they are defined per device so the pointer will be unique as
well. bus_register doesn't need to be a macro anymore so change it
to the inline. We could get rid of __bus_register as there is no other
caller but maybe somebody will want to use a different key so keep it
around for now.
Reported-by: Li Zefan <lizefan@huawei.com>
Signed-off-by: Michal Hocko <mhocko@suse.cz>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Provide a feel of how much overhead the rbtree cache adds to
the game.
[Slightly reworded output in debugfs -- broonie]
Signed-off-by: Dimitris Papastamos <dp@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
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Kay tells me the most appropriate place to expose workqueues to
userland would be /sys/devices/virtual/workqueues/WQ_NAME which is
symlinked to /sys/bus/workqueue/devices/WQ_NAME and that we're lacking
a way to do that outside of driver core as virtual_device_parent()
isn't exported and there's no inteface to conveniently create a
virtual subsystem.
This patch implements subsys_virtual_register() by factoring out
subsys_register() from subsys_system_register() and using it with
virtual_device_parent() as the origin directory. It's identical to
subsys_system_register() other than the origin directory but we aren't
gonna restrict the device names which should be used under it.
This will be used to expose workqueue attributes to userland.
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Kay Sievers <kay.sievers@vrfy.org>
|
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In the rbtree code we are exposing statistics relating to the
number of nodes/registers of the rbtree cache for each of the
devices. Ensure that `map->debugfs' has been initialized before
we attempt to initialize the debugfs entry for the rbtree cache.
Signed-off-by: Dimitris Papastamos <dp@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Cc: stable@vger.kernel.org
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git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
Pull ACPI and power management fixes from Rafael J Wysocki:
- Two fixes for the new intel_pstate driver from Dirk Brandewie.
- Fix for incorrect usage of the .find_bridge() callback from struct
acpi_bus_type in the USB core and subsequent removal of that callback
from Rafael J Wysocki.
- ACPI processor driver cleanups from Chen Gang and Syam Sidhardhan.
- ACPI initialization and error messages fix from Joe Perches.
- Operating Performance Points documentation improvement from Nishanth
Menon.
- Fixes for memory leaks and potential concurrency issues and sysfs
attributes leaks during device removal in the core device PM QoS code
from Rafael J Wysocki.
- Calxeda Highbank cpufreq driver simplification from Emilio López.
- cpufreq comment cleanup from Namhyung Kim.
- Fix for a section mismatch in Calxeda Highbank interprocessor
communication code from Mark Langsdorf (this is not a PM fix strictly
speaking, but the code in question went in through the PM tree).
* tag 'pm+acpi-3.9-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
cpufreq / intel_pstate: Do not load on VM that does not report max P state.
cpufreq / intel_pstate: Fix intel_pstate_init() error path
ACPI / glue: Drop .find_bridge() callback from struct acpi_bus_type
ACPI / glue: Add .match() callback to struct acpi_bus_type
ACPI / porocessor: Beautify code, pr->id is u32 which is never < 0
ACPI / processor: Remove redundant NULL check before kfree
ACPI / Sleep: Avoid interleaved message on errors
PM / QoS: Remove device PM QoS sysfs attributes at the right place
PM / QoS: Fix concurrency issues and memory leaks in device PM QoS
cpufreq: highbank: do not initialize array with a loop
PM / OPP: improve introductory documentation
cpufreq: Fix a typo in comment
mailbox, pl320-ipc: remove __init from probe function
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git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap
Pull regmap PM fix from Mark Brown:
"A simple fix to stop us leaking a runtime PM reference in the case
where we fail to enable a device."
* tag 'regmap-v3.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap:
regmap: irq: call pm_runtime_put in pm_runtime_get_sync failed case
|
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Device PM QoS sysfs attributes, if present during device removal,
are removed from within device_pm_remove(), which is too late,
since dpm_sysfs_remove() has already removed the whole attribute
group they belonged to. However, moving the removal of those
attributes to dpm_sysfs_remove() alone is not sufficient, because
in theory they still can be re-added right after being removed by it
(the device's driver is still bound to it at that point).
For this reason, move the entire desctruction of device PM QoS
constraints to dpm_sysfs_remove() and make it prevent any new
constraints from being added after it has run. Also, move the
initialization of the power.qos field in struct device to
device_pm_init_common() and drop the no longer needed
dev_pm_qos_constraints_init().
Reported-by: Sasha Levin <sasha.levin@oracle.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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|
The current device PM QoS code assumes that certain functions will
never be called in parallel with each other (for example, it is
assumed that dev_pm_qos_expose_flags() won't be called in parallel
with dev_pm_qos_hide_flags() for the same device and analogously
for the latency limit), which may be overly optimistic. Moreover,
dev_pm_qos_expose_flags() and dev_pm_qos_expose_latency_limit()
leak memory in error code paths (req needs to be freed on errors)
and __dev_pm_qos_drop_user_request() forgets to free the request.
To fix the above issues put more things under the device PM QoS
mutex to make them mutually exclusive and add the missing freeing
of memory.
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
|
|
This file lists the register ranges in the register map. The condition
to split the range is based on whether the block is readable or not.
Ensure that we lock the `debugfs_off_cache' list whenever we access
and modify the list. There is a possible race otherwise between the
read() operations of the `registers' file and the `range' file.
Signed-off-by: Dimitris Papastamos <dp@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
|
|
We don't need to use any of the file position information
to calculate the base and max register of each block. Just
use the counter directly.
Set `i = base' at the top to avoid GCC flow analysis bugs. The
value of `i' can never be undefined or 0 in the if (c) { ... }.
Signed-off-by: Dimitris Papastamos <dp@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
|
|
This allows the cached data to be sent directly to the device when
we sync it.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
|
|
Currently the value parsing operations both return the parsed value and
modify the passed buffer. This precludes their use in places like the cache
code so split out the in place modification into a new parse_inplace()
operation.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
|
|
Factor things out a little.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
|
|
It's more idiomatic to pass the map structure around and this means we
can use other bits of information from the map.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
|
|
If we're updating a value in place it's more work to read the value and
compare the value with what we're about to set than it is to just write
the value into the cache; there are no further operations after writing
in the code even though there's an early return here.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
|
|
Trace when we start and complete async writes, and when we start and
finish blocking for their completion. This is useful for performance
analysis of the resulting I/O patterns.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
|
|
Even in failed case of pm_runtime_get_sync, the usage_count
is incremented. In order to keep the usage_count with correct
value and runtime power management to behave correctly, call
pm_runtime_put(_sync) in such case.
Signed-off-by Liu Chuansheng <chuansheng.liu@intel.com>
Signed-off-by: Li Fei <fei.li@intel.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
|
|
Callers to dma_buf_mmap expect to fput() the vma struct's vm_file
themselves on failure. Not restoring the struct's data on failure
causes a double-decrement of the vm_file's refcount.
Signed-off-by: John Sheu <sheu@google.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org>
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|
All drivers which implement this need to have some sort of refcount to
allow concurrent vmap usage. Hence implement this in the dma-buf core.
To protect against concurrent calls we need a lock, which potentially
causes new funny locking inversions. But this shouldn't be a problem
for exporters with statically allocated backing storage, and more
dynamic drivers have decent issues already anyway.
Inspired by some refactoring patches from Aaron Plattner, who
implemented the same idea, but only for drm/prime drivers.
v2: Check in dma_buf_release that no dangling vmaps are left.
Suggested by Aaron Plattner. We might want to do similar checks for
attachments, but that's for another patch. Also fix up ERR_PTR return
for vmap.
v3: Check whether the passed-in vmap address matches with the cached
one for vunmap. Eventually we might want to remove that parameter -
compared to the kmap functions there's no need for the vaddr for
unmapping. Suggested by Chris Wilson.
v4: Fix a brown-paper-bag bug spotted by Aaron Plattner.
Cc: Aaron Plattner <aplattner@nvidia.com>
Reviewed-by: Aaron Plattner <aplattner@nvidia.com>
Tested-by: Aaron Plattner <aplattner@nvidia.com>
Reviewed-by: Rob Clark <rob@ti.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org>
|
