| Commit message (Collapse) | Author | Age |
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The registers for the Samsung S3C serial port are currently defined in
the platform specific arch/arm/plat-samsung/include/plat/regs-serial.h
file, which is not visible to multiplatform capable drivers.
Unfortunately, it is not possible to move the file into a more local
place as we should normally try to, because the same registers
may be used in one of four places:
* In the driver itself
* In platform-independent ARM code for early debug output
* In platform_data definitions
* In the Samsung platform power management code
I have also found no way to logically split out a platform_data
file, other than possibly move everything into
include/linux/platform_data, which also felt wrong. The only
part of this file that makes sense to keep specific to the s3c24xx
platform are the virtual and physical addresses defined here,
which are needed in no other location.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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We need the fixes here as well.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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In DMA support, The received data is not pushed to tty until the DMA buffer
is filled. But some megabyte rate chips such as BT expect fast response and
data should be pushed immediately. In order to fix this issue, We suggest
the use of the timer for polling DMA buffer.
In our test, no data loss occurred at high-baudrate as compared with interrupt-
driven (We tested with 3Mbps).
We changes:
- We add timer for polling. If we set poll_timer to 10, every 10ms,
timer handler checks the residue in the dma buffer and transfer data
to the tty. Also, last_residue is updated for the next polling.
- poll_timeout is used to prevent the timer's system cost.
If poll_timeout is set to 3000 and no data is received in 3 seconds,
we inactivate poll timer and driver falls back to interrupt-driven.
When data is received again in FIFO and UART irq is occurred, we switch
back to DMA mode and start polling.
- We use consistent DMA mappings to avoid from the frequent cache operation
of the timer function for default.
- pl011_dma_rx_chars is modified. the pending size is recalculated because
data can be taken by polling.
- the polling time is adjusted if dma rx poll is enabled but no rate is
specified. Ideal polling interval to push 1 character at every interval
is the reciprocal of 'baud rate / 10 line bits per character / 1000 ms
per sec'. But It is very aggressive to system. Experimentally,
'10000000 / baud' is suitable to receive dozens of characters. the poll rate
can be specified statically by dma_rx_poll_rate of the platform data as well.
Changes compared to v1:
- Use of consistent DMA mappings.
- Added dma_rx_poll_rate in platform data to specify the polling interval.
- Added dma_rx_poll_timeout in platform data to specify the polling timeout.
Changes compared to v2:
- Use of consistent DMA mappings for default.
- Added dma_rx_poll_enable in platform data to adjust the polling time
according to the baud rate.
- remove unnecessary lock from the polling function.
Signed-off-by: Chanho Min <chanho.min@lge.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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tty_ldisc_hangup() guarantees the ldisc is enabled (or that there
is no ldisc). Since __tty_hangup() was the only user, re-define
tty_ldisc_enable() in file-scope.
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Flip buffer work must not be scheduled by the line discipline
after the line discipline has been halted; issue warning.
Note: drivers can still schedule flip buffer work.
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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It allows for cleaning up on a considerable amount of places. They did
port_get, hangup, kref_put. Now the only thing needed is to call
tty_port_tty_hangup which does exactly that. And they can also decide
whether to consider CLOCAL or completely ignore that.
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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It allows for cleaning up on a considerable amount of places. They did
port_get, wakeup, kref_put. Now the only thing needed is to call
tty_port_tty_wakeup which does exactly that.
One exception is ifx6x60 where tty_wakeup was open-coded. We now call
tty_wakeup properly there.
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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The warning is there since 2.1.69 and we have not seen anybody
reporting it in the past decade. Remove the warning now.
tty_get_baud_rate can now be inline. This gives us one less
EXPORT_SYMBOL.
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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The tty driver can become stuck throttled due to race conditions
between throttle and unthrottle, when the decision to throttle
or unthrottle is conditional. The following example helps to
illustrate the race:
CPU 0 | CPU 1
|
if (condition A) |
| <processing such that A not true>
| if (!condition A)
| unthrottle()
throttle() |
|
Note the converse is also possible; ie.,
CPU 0 | CPU 1
|
| if (!condition A)
<processing such that A true> |
if (condition A) |
throttle() |
| unthrottle()
|
Add new throttle/unthrottle functions based on the familiar model
of task state and schedule/wake. For example,
while (1) {
tty_set_flow_change(tty, TTY_THROTTLE_SAFE);
if (!condition)
break;
if (!tty_throttle_safe(tty))
break;
}
__tty_set_flow_change(tty, 0);
In this example, if an unthrottle occurs after the condition is
evaluated but before tty_throttle_safe(), then tty_throttle_safe()
will return non-zero, looping and forcing the re-evaluation of
condition.
Reported-by: Vincent Pillet <vincentx.pillet@intel.com>
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging
Pull staging driver tree update from Greg Kroah-Hartman:
"Here's the big staging driver tree update for 3.10-rc1
This update contains loads of comedi driver cleanups and fixes in
here, iio updates, android driver changes, and other various staging
driver cleanups.
Thanks to some drivers being removed, and the comedi driver cleanups,
we have removed more code than we added:
627 files changed, 65145 insertions(+), 76321 deletions(-)
which is always nice to see.
All of these have been in linux-next for a while."
* tag 'staging-3.10-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging: (940 commits)
staging: comedi: ni_labpc: fix legacy driver build
staging: comedi: das800: cleanup the cio-das802/16 fifo comments
staging: comedi: das800: rename CamelCase vars in das800_ai_do_cmd()
staging: comedi: das800: tidy up the private data
staging: comedi: das800: tidy up das800_interrupt()
staging: comedi: das800: tidy up das800_ai_insn_read()
staging: comedi: das800: tidy up das800_di_insn_bits()
staging: comedi: das800: tidy up das800_do_insn_bits()
staging: comedi: das800: remove extra divisor calculation call
staging: comedi: das800: rename {enable,disable}_das800
staging: comedi: das800: tidy up subdevice init
staging: comedi: das800: allow attaching without interrupt support
staging: comedi: das800: interrupts are required for async command support
staging: comedi: das800: tidy up das800_ai_do_cmdtest()
staging: comedi: das800: remove 'volatile' on private data variables
staging: comedi: das800: cleanup the boardinfo
staging: comedi: das800: cleanup range table declarations
staging: comedi: das800: introduce das800_ind_{write, read}()
staging: comedi: das800: remove forward declarations
staging: comedi: das800: move das800_set_frequency()
...
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| | | |_|_|/ / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / /
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We want these fixes here.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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This pulls in all of the good fixes we need here.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Use dev_{set,get}_drvdata for managing private data attached to a trigger
instead of using a custom field in the iio_trigger struct.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
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| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Introduce iio_tigger_{set,get}_drvdata which allows to attach driver specific
data to a trigger. The functions wrap access to the triggers private_data field
and all current users are updated to use iio_tigger_{set,get}_drvdata instead of
directly accessing the private_data field. This is the first step towards
removing the private_data field from the iio_trigger struct.
The following coccinelle script has been used to update the drivers:
<smpl>
@@
struct iio_trigger *trigger;
expression priv;
@@
-trigger->private_data = priv
+iio_trigger_set_drv_data(trigger, priv)
@@
struct iio_trigger *trigger;
@@
-trigger->private_data
+iio_trigger_get_drv_data(trigger)
</smpl>
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
|
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git://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio into staging-next
Jonathan writes:
First set of IIO new drivers and cleanup for the 3.10 cycle.
New stuff
1) Add OF support for specifying mappings between iio devices and their
in kernel consumers.
2) Driver for AD7923 (extra functionality and support for ad7904, ad7914 and
ad7924 added later in series)
3) Driver for Exynos adc (dt suppor for phy added later in series).
4) Make iio_push_event save IRQ context - necessary if it is to be used
within an interrupt handler. Users of this functionality to follow.
5) For iio use the device tree node name to provide the hwmon name attribute
if available.
Removal and moves out of staging
1) Drop the adt7410 driver from IIO now that there is a hmwon driver with
equivalent support. This device is very much targeted at hardware
monitoring so hwmon is a more appropriate host for the driver.
2) Move iio_hwmon driver to drivers/hwmon.
Cleanups
1) Minor cleanup in ST common library.
2) Large set of patches to break the info_mask element which previously used
odd and even bits to specify if a channel attribute was either shared across
similar channels or specific to only one. Now we have two bitmaps, one for
those parameters that are specific to this channel and one for those shared
by all channels with the same type as this one. This has no effect on the
userspace abi. It simplifies the core code and provides more space for new
channel parameters. It has been on the todo list for a long time!
Conflicts:
drivers/iio/dac/ad5064.c
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This has been replaced by the pair of masks info_mask_separate
and info_mask_shared_by_type. Other variants may follow.
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Acked-by: Lars-Peter Clausen <lars@metafoo.de>
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The original info_mask is going away in favour of the broken out versions.
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Acked-by: Lars-Peter Clausen <lars@metafoo.de>
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The original info_mask is going away in favour of the broken out versions.
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Acked-by: Lars-Peter Clausen <lars@metafoo.de>
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The original info_mask is going away in favour of the broken out versions.
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Acked-by: Denis Ciocca <denis.ciocca@st.com>
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This simplifies the code, removes an extensive layer of 'helper' macros
and gives us twice as much room to play with in these masks before we
have any need to be clever.
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Acked-by: Lars-Peter Clausen <lars@metafoo.de>
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git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core
Pull driver core update from Greg Kroah-Hartman:
"Here's the merge request for the driver core tree for 3.10-rc1
It's pretty small, just a number of driver core and sysfs updates and
fixes, all of which have been in linux-next for a while now.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>"
Fixed conflict in kernel/rtmutex-tester.c, the locking tree had a better
fix for the same sysfs file mode problem.
* tag 'driver-core-3.10-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core:
PM / Runtime: Idle devices asynchronously after probe|release
driver core: handle user namespaces properly with the uid/gid devtmpfs change
driver core: devtmpfs: fix compile failure with CONFIG_UIDGID_STRICT_TYPE_CHECKS
devtmpfs: add base.h include
driver core: add uid and gid to devtmpfs
sysfs: check if one entry has been removed before freeing
sysfs: fix crash_notes_size build warning
sysfs: fix use after free in case of concurrent read/write and readdir
rtmutex-tester: fix mode of sysfs files
Documentation: Add ABI entry for crash_notes and crash_notes_size
sysfs: Add crash_notes_size to export percpu note size
driver core: platform_device.h: fix checkpatch errors and warnings
driver core: platform.c: fix checkpatch errors and warnings
driver core: warn that platform_driver_probe can not use deferred probing
sysfs: use atomic_inc_unless_negative in sysfs_get_active
base: core: WARN() about bogus permissions on device attributes
device: separate all subsys mutexes
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Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Now that devtmpfs is caring about uid/gid, we need to use the correct
internal types so users who have USER_NS enabled will have things work
properly for them.
Thanks to Eric for pointing this out, and the patch review.
Reported-by: Eric W. Biederman <ebiederm@xmission.com>
Cc: Kay Sievers <kay@vrfy.org>
Cc: Ming Lei <ming.lei@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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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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We want the fixes in here.
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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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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git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc
Pull char/misc driver update from Greg Kroah-Hartman:
"Here's the big char / misc driver update for 3.10-rc1
A number of various driver updates, the majority being new
functionality in the MEI driver subsystem (it's now a subsystem, it
started out just a single driver), extcon updates, memory updates,
hyper-v updates, and a bunch of other small stuff that doesn't fit in
any other tree.
All of these have been in linux-next for a while"
* tag 'char-misc-3.10-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: (148 commits)
Tools: hv: Fix a checkpatch warning
tools: hv: skip iso9660 mounts in hv_vss_daemon
tools: hv: use FIFREEZE/FITHAW in hv_vss_daemon
tools: hv: use getmntent in hv_vss_daemon
Tools: hv: Fix a checkpatch warning
tools: hv: fix checks for origin of netlink message in hv_vss_daemon
Tools: hv: fix warnings in hv_vss_daemon
misc: mark spear13xx-pcie-gadget as broken
mei: fix krealloc() misuse in in mei_cl_irq_read_msg()
mei: reduce flow control only for completed messages
mei: reseting -> resetting
mei: fix reading large reposnes
mei: revamp mei_irq_read_client_message function
mei: revamp mei_amthif_irq_read_message
mei: revamp hbm state machine
Revert "drivers/scsi: use module_pcmcia_driver() in pcmcia drivers"
Revert "scsi: pcmcia: nsp_cs: remove module init/exit function prototypes"
scsi: pcmcia: nsp_cs: remove module init/exit function prototypes
mei: wd: fix line over 80 characters
misc: tsl2550: Use dev_pm_ops
...
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We want the fixes in there.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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It should be left to the drivers to enable and disable the device on the
MEI bus when e.g getting probed.
For drivers to be able to safely call the enable and disable hooks, the
mei_cl_ops must be set before it's probed and thus this should happen
before registering the device on the MEI bus. Hence the mei_cl_add_device()
prototype change.
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/broonie/misc into char-misc-next
Mark writes:
extcon: arizona: Updates for v3.10
There's a bunch of different things in this series, I can split them out
if need be:
- Support for configuring the button detection circuit to reflect the
accessories supplied with the system.
- Improvements in the HPDET based detection scheme.
- Additional robustness against more pathological use cases.
- A few small standalone fixes.
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Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
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Help mitigate against mechanical bounce during the initial detection by
allowing the configuration of an additional debounce on top of that the
hardware does during the initial phase of microphone detection operation.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
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Rather than measuring both HP channels we can simply directly measure the
microphone impedance and then rely on MICDET for final confirmation of the
presence of a suitable microphone. This improves the overall performance
of the identification process.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
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In some designs an external pull won't be needed.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
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The Arizona button detection circuit is configurable, allowing the system
integrator to program a range of thresholds for the buttons supported on
the accessory but currently the driver uses the default button ranges and
does not provide any flexibility in how this is exposed to the application
layer.
Provide platform data allowing the user to control this and to map
the buttons to keys in the input subsystem.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
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Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
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This picks up the fixes in 3.9-rc5 that we need here.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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MEI drivers should be able to carry their private data around.
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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mei client bus will present some of the mei clients
as devices for other standard subsystems
Implement the probe, remove, match, device addtion routines, along with
the sysfs and uevent ones. mei_cl_device_id is also added to
mod_devicetable.h
A mei-cleint-bus.txt document describing the rationale and the API usage
is also added while ABI/testing/sysfs-bus-mei describeis the modalias ABI.
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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This picks up the MEI fixes that we need in this branch now.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/broonie/misc into char-misc-next
Mark writes:
ASoC/extcon: arizona: Fix interaction between HPDET and headphone outputs
This patch series covers both ASoC and extcon subsystems and fixes an
interaction between the HPDET function and the headphone outputs - we
really shouldn't run HPDET while the headphone is active. The first
patch is a refactoring to make the extcon side easier.
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Running HPDET while the headphone outputs are enabled can disrupt the
operation of HPDET. In order to avoid this HPDET needs to disable the
headphone outputs and ASoC needs to not enable them while HPDET is
running.
Do the ASoC side of this by storing the enable state in the core driver
structure and only writing to the device if a flag indicating that the
accessory detection side is in a state where it can have the headphone
output stage enabled.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
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As per JESD209-2E specification for LPDDR2,
http://www.jedec.org/standards-documents/results/jesd209-2E
Table 73, LPDDR2 memories come in two flavors - Standard and
Extended. The Standard types can operate from -25C to +85C
However, beyond that and upto +105C can only be supported by
Extended types.
Unfortunately, it seems there is no info in MR0(device info) or
MR[1,2](device feature) for run time detection of this capability
as far as seen on the spec. Hence, we provide a custom_config
flag to be populated by platforms which have these "extended"
type memories.
For the "Standard" memories, we need to consider MR4 notifications
of temperature triggers >85C as equivalent to thermal shutdown
events (equivalent to Spec specified thermal shutdown events for
"extended" parts).
Reported-by: Richard Woodruff <r-woodruff2@ti.com>
Signed-off-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Although the SSBI sub is currently only used on MSM SoCs, it is still
a bus in its own right. Remove this msm_ prefix from the driver and
it's symbols. Clients can now refer directly to ssbi_write() and
ssbi_read().
Signed-off-by: David Brown <davidb@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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