To unregister led class devices and sysfs attributes,
LP5521 and LP5523 have each driver function.
This patch makes both drivers simple using common driver function,
lp55xx_unregister_leds().
And some unused variables are removed.
Signed-off-by: Milo(Woogyom) Kim <milo.kim@ti.com>
Signed-off-by: Bryan Wu <cooloney@gmail.com>
LED current is configurable via the sysfs.
Max current is a read-only attribute.
These attributes code can be shared in lp55xx common driver.
Device attributes: 'led_current' and 'max_current'
move to lp55xx common driver
Replaced functions:
show_max_current() => lp55xx_show_max_current()
show_current() => lp55xx_show_current()
store_current() => lp55xx_store_current()
LED setting function: set_led_current()
Current registers are device specific, so configurable function is added
in each driver.
Signed-off-by: Milo(Woogyom) Kim <milo.kim@ti.com>
Signed-off-by: Bryan Wu <cooloney@gmail.com>
lp5521_set_brightness() and lp5523_set_brightness() are replaced with
common function, lp55xx_set_brightness().
This function is invoked when the brightness of each LED channel is updated.
LP5521 and LP5523 have different register address for the brightness control,
so this work is done by chip specific brightness_work_fn().
lp5521/5523_led_brightness_work():
use lp55xx_led and lp55xx_chip data structure.
use lp55xx write function.
Signed-off-by: Milo(Woogyom) Kim <milo.kim@ti.com>
Signed-off-by: Bryan Wu <cooloney@gmail.com>
lp5521_init_led() and lp5523_init_led() are replaced with one common function,
lp55xx_init_led().
Max channels is configurable, so it's used in lp55xx_init_led().
'LP5523_LEDS' are changed to 'LP5523_MAX_LEDS'.
lp55xx_set_brightness, lp55xx_led_attributes: skeleton
Will be filled in next patches.
Signed-off-by: Milo(Woogyom) Kim <milo.kim@ti.com>
Signed-off-by: Bryan Wu <cooloney@gmail.com>
LED class devices are registered in lp5521_register_leds() and
lp5523_register_leds().
Two separate functions are merged into consolidated lp55xx function,
lp55xx_register_leds().
Error handling fix:
Unregistering LEDS are handled in lp55xx_register_leds() when LED registration
failure occurs. So each driver error handler is changed to 'err_register_leds'
Chip dependency: 'brightness_work_fn' and 'set_led_current'
To make the structure abstract, both functions are configured in each driver.
Those functions should be done by each driver because register control is
chip-dependant work.
lp55xx_init_led: skeleton
Will be filled in next patch
Signed-off-by: Milo(Woogyom) Kim <milo.kim@ti.com>
Signed-off-by: Bryan Wu <cooloney@gmail.com>
Two separate de-init functions are merged into one common function.
And it is used in err_post_init of lp55xx_init_device().
Signed-off-by: Milo(Woogyom) Kim <milo.kim@ti.com>
Signed-off-by: Bryan Wu <cooloney@gmail.com>
lp5521/5523_init_device() are replaced with lp55xx common function,
lp55xx_init_device().
Error handler in init_device:
deinit function are matched with 'err_post_init' section in
lp55xx_init_device().
Remove LP5523 engine intialization code:
Engine functionality is not mandatory but optional.
Moreover engine initialization is done internally with device reset command.
Therefore, this code is unnecessary.
Signed-off-by: Milo(Woogyom) Kim <milo.kim@ti.com>
Signed-off-by: Bryan Wu <cooloney@gmail.com>
LP5521/5523 chip configuration is replaced with lp55xx common function,
lp55xx_post_init_device().
Name change:
lp5521/5523_configure() to lp5521/5523_post_init_device()
These are called in init function.
Register access function
Argument type is changed from 'i2c_client' to 'lp55xx_chip'.
Use exported R/W functions of lp55xx common driver.
Temporary variables in lp5521/5523_init_device()
These functions will be removed but temporary variables are needed for
blocking build warnings - incompatible pointer.
Signed-off-by: Milo(Woogyom) Kim <milo.kim@ti.com>
Signed-off-by: Bryan Wu <cooloney@gmail.com>
LP5521/5523 chip detection functions are replaced with lp55xx common function,
lp55xx_detect_device().
Chip dependent address and values are configurable in each driver.
In init function, chip detection is executed.
Signed-off-by: Milo(Woogyom) Kim <milo.kim@ti.com>
Signed-off-by: Bryan Wu <cooloney@gmail.com>
LP5521/5523 reset device functions are moved to lp55xx common driver.
Value of register address and value are chip dependent.
Those are configured in each driver.
In init function, reset command is executed.
Signed-off-by: Milo(Woogyom) Kim <milo.kim@ti.com>
Signed-off-by: Bryan Wu <cooloney@gmail.com>
LP5521/5523 platform data functions are moved to lp55xx common driver.
New init function, lp55xx_init_device() is created.
Signed-off-by: Milo(Woogyom) Kim <milo.kim@ti.com>
Signed-off-by: Bryan Wu <cooloney@gmail.com>
This patch is a preceding step for making common lp55xx init function.
Return code:
Do not use 'OR' arithmetic for the result.
If some error occurs, just return it.
Remove engine verification code:
To check whether internal engine works or not, many lines of code are executed.
However, this job is unnecessary during the chip initialization because
the engine usage is not mandatory but optional function.
LED engines are enabled when specific LED pattern is loaded.
Therefore, this verification code is removed.
Signed-off-by: Milo(Woogyom) Kim <milo.kim@ti.com>
Signed-off-by: Bryan Wu <cooloney@gmail.com>
This patch is a preceding step for making common lp55xx init function.
LP5521_REG_R_CURRENT register code moved:
Chip specific code moved from lp5521_init_device() to lp5521_configure().
Remove engine init function:
LP5521 has internal program engines which are used for running LED patterns.
(blinking, ramp up/down and other emotional visual effects)
Engine initialization is done by reset command in lp5521_init_device().
Remove this duplicate code.
Return code:
Do not use 'OR' arithmetic for the result.
If some error occus, just return it.
Enable latency:
Use explicit named function, lp5521_wait_enable_done().
According to the datasheet, 500us is guaranteed time.
Thus wait time is changed from 1000us to 500us.
Signed-off-by: Milo(Woogyom) Kim <milo.kim@ti.com>
Signed-off-by: Bryan Wu <cooloney@gmail.com>
LP5521 and LP5523 data structures have common features.
Use common lp55xx data structures rather than chip specific data.
Legacy code in probe is replaced with this new data structures.
lp55xx_chip : Common data between lp5521_chip and lp5523_chip
lp55xx_led : Common LED structure between lp5521_led and lp5523_led
lp55xx_platform_data : Common platform data between lp5521_platform_data and
lp5523_platform_data
Signed-off-by: Milo(Woogyom) Kim <milo.kim@ti.com>
Signed-off-by: Bryan Wu <cooloney@gmail.com>
Change the name of chip data structure and platform data.
This patch is a preceding step for cleaning up lp5521/5523 probe and remove.
These data will be replaced with new lp55xx common data structures
in next patch.
Signed-off-by: Milo(Woogyom) Kim <milo.kim@ti.com>
Signed-off-by: Bryan Wu <cooloney@gmail.com>
This patch supports basic common driver code for LP5521, LP5523/55231 devices.
( Driver Structure Data )
lp55xx_led and lp55xx_chip
In lp55xx common driver, two different data structure is used.
o lp55xx_led
control multi output LED channels such as led current, channel index.
o lp55xx_chip
general chip control such like the I2C and platform data.
For example, LP5521 has maximum 3 LED channels.
LP5523/55231 has 9 output channels.
lp55xx_chip for LP5521 ... lp55xx_led #1
lp55xx_led #2
lp55xx_led #3
lp55xx_chip for LP5523 ... lp55xx_led #1
lp55xx_led #2
.
.
lp55xx_led #9
( Platform Data )
LP5521 and LP5523/55231 have own specific platform data.
However, this data can be handled with just one platform data structure.
The lp55xx platform data is declared in the header.
This structure is derived from leds-lp5521.h and leds-lp5523.h
Signed-off-by: Milo(Woogyom) Kim <milo.kim@ti.com>
Signed-off-by: Bryan Wu <cooloney@gmail.com>
Chip specific function is configured when the device is initialized.
So _configure() is moved to each device init function.
If chip configuration gets failed, the device is de-initialized in
each _init_device(), not probe().
For compile error fix, function type declarations are added.
Signed-off-by: Milo(Woogyom) Kim <milo.kim@ti.com>
Signed-off-by: Bryan Wu <cooloney@gmail.com>
Use explicit each driver function rather than raw command.
These function will be merged into the lp55xx common driver.
Signed-off-by: Milo(Woogyom) Kim <milo.kim@ti.com>
Signed-off-by: Bryan Wu <cooloney@gmail.com>
To make LED unregistration code simple, new function, _unregister_leds()
is added in each driver.
This patch is a preceding step for lp55xx common driver architecture.
Signed-off-by: Milo(Woogyom) Kim <milo.kim@ti.com>
Signed-off-by: Bryan Wu <cooloney@gmail.com>
To make LED initialization code simple, new function, _register_leds()
is added at each driver.
This patch is a preceding step for lp55xx common driver architecture.
Signed-off-by: Milo(Woogyom) Kim <milo.kim@ti.com>
Signed-off-by: Bryan Wu <cooloney@gmail.com>
Device de-initialization code is moved to _deinit_device() at each driver.
This patch is a preceding step for lp55xx common driver architecture.
Signed-off-by: Milo(Woogyom) Kim <milo.kim@ti.com>
Signed-off-by: Bryan Wu <cooloney@gmail.com>
To make _probe() simple, device initialization code is moved to
_init_device() at each driver.
This patch is a preceding step for lp55xx common driver architecture.
leds-lp5521:
When 'lp5521_init_device()' gets failed, error handling should be 'fail1'
rather than 'fail2'.
fail1: releasing platform resource and return code
fail2: releasing allocated LED devices with handling 'fail1'
The 'lp5521_init_device()' is called before creating LED devices.
Thus, 'goto fail1' is proper error handler of this function.
Signed-off-by: Milo(Woogyom) Kim <milo.kim@ti.com>
Signed-off-by: Bryan Wu <cooloney@gmail.com>
This macro is used to create a struct pci_device_id array.
Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Bryan Wu <cooloney@gmail.com>
I spent a few minutes to understand why the code catching the mismatch case
by checking if k is 0 or not. And the code using "k - 1" as array index is
unusual.
This patch checks acceptable rate from the lowest rate, and then we don't need
to subtract k by 1. This change improves the readability.
Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Bryan Wu <cooloney@gmail.com>
Add lm3530_led_enable() and lm3530_led_disable() helper functions.
This ensures setting drvdata->enable to correct status if regulator_disable
fails.
Signed-off-by: Axel Lin <axel.lin@ingics.com>
Acked-by: Shreshtha Kumar SAHU <shreshthakumar.sahu@stericsson.com>
Acked-by: Milo Kim <milo.kim@ti.com>
Tested-by: Milo Kim <milo.kim@ti.com>
Signed-off-by: Bryan Wu <cooloney@gmail.com>
The lp8788-keyled is a platform driver of lp8788-mfd. The platform
device is allocated when mfd_add_devices() is called in lp8788-mfd.
On the other hand, 'lp->dev' is the i2c client device.
Therefore, this 'platform_device' is a proper parent device in case
of resource managed mem alloc, registering led device and device
kernel messages.
Signed-off-by: Milo(Woogyom) Kim <milo.kim@ti.com>
Signed-off-by: Bryan Wu <cooloney@gmail.com>
The DT binding for the pwm-leds devices are similar to the gpio-leds type.
LEDs are represented as sub-nodes of the pwm-leds device.
The code for handling the DT boot is based on the code found in the
leds-gpio driver and adapted to use PWMs instead of GPIOs.
To avoid having custom cleanup code in case of DT boot the newly created
devm_of_pwm_get() API is used to get the correct PWM instance.
For usage see:
Documentation/devicetree/bindings/leds/leds-pwm.txt
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Bryan Wu <cooloney@gmail.com>
The code looks more nicer if we use:
while (i--)
instead:
if (i > 0)
for (i = i - 1; i >= 0; i--)
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Bryan Wu <cooloney@gmail.com>
When booted with DT users can use devm version of of_pwm_get() to benefit
from automatic resource release.
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Acked-by: Thierry Reding <thierry.reding@avionic-design.de>
Signed-off-by: Bryan Wu <cooloney@gmail.com>
Allow client driver to use of_pwm_get() to get the PWM they need. This
is needed for drivers which handle more than one PWM separately, like
leds-pwm driver, which have:
pwmleds {
compatible = "pwm-leds";
kpad {
label = "omap4::keypad";
pwms = <&twl_pwm 0 7812500>;
max-brightness = <127>;
};
charging {
label = "omap4:green:chrg";
pwms = <&twl_pwmled 0 7812500>;
max-brightness = <255>;
};
};
in the dts files.
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Acked-by: Thierry Reding <thierry.reding@avionic-design.de>
Signed-off-by: Bryan Wu <cooloney@gmail.com>
To synchronize the header file definition and the actual code. In the code
the consumer parameter is named as con_id, change the header file and replace
consumer -> con_id in the parameter list.
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Ackedy-by: Thierry Reding <thierry.reding@avionic-design.de>
Signed-off-by: Bryan Wu <cooloney@gmail.com>
In order to be able to add device tree support for leds-pwm driver we need
to rearrange the data structures used by the drivers.
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Bryan Wu <cooloney@gmail.com>
Update the driver to use the new API for requesting pwm so we can take
advantage of the pwm_lookup table to find the correct pwm to be used for the
LED functionality.
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Bryan Wu <cooloney@gmail.com>
Support added only for leds (not for gpio's).
(cooloney@gmail.com: fix 2 building errors)
Signed-off-by: Marek Belisko <marek.belisko@open-nandra.com>
Signed-off-by: Bryan Wu <cooloney@gmail.com>
support.
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Merge tag 'dm-3.8-fixes-2' of git://git.kernel.org/pub/scm/linux/kernel/git/agk/linux-dm
Pull more device-mapper fixes from Alasdair G Kergon:
"A fix for stacked dm thin devices and a fix for the new dm WRITE SAME
support."
* tag 'dm-3.8-fixes-2' of git://git.kernel.org/pub/scm/linux/kernel/git/agk/linux-dm:
dm: fix write same requests counting
dm thin: fix queue limits stacking
PullHID fixes from Jiri Kosina:
- fix i2c-hid and hidraw interaction, by Benjamin Tissoires
- a quirk to make a particular device (Formosa IR receiver) work
properly, by Nicholas Santos
* 'for-3.8/upstream-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid:
HID: i2c-hid: fix i2c_hid_output_raw_report
HID: usbhid: quirk for Formosa IR receiver
HID: remove x bit from sensor doc
- Error reporting in nfs_xdev_mount incorrectly maps all errors to ENOMEM
- Fix an NFSv4 refcounting issue
- Fix a mount failure when the server reboots during NFSv4 trunking discovery
- NFSv4.1 mounts may need to run the lease recovery thread.
- Don't silently fail setattr() requests on mountpoints
- Fix a SUNRPC socket/transport livelock and priority queue issue
- We must handle NFS4ERR_DELAY when resetting the NFSv4.1 session.
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Merge tag 'nfs-for-3.8-4' of git://git.linux-nfs.org/projects/trondmy/linux-nfs
Pull NFS client bugfixes from Trond Myklebust:
- Error reporting in nfs_xdev_mount incorrectly maps all errors to
ENOMEM
- Fix an NFSv4 refcounting issue
- Fix a mount failure when the server reboots during NFSv4 trunking
discovery
- NFSv4.1 mounts may need to run the lease recovery thread.
- Don't silently fail setattr() requests on mountpoints
- Fix a SUNRPC socket/transport livelock and priority queue issue
- We must handle NFS4ERR_DELAY when resetting the NFSv4.1 session.
* tag 'nfs-for-3.8-4' of git://git.linux-nfs.org/projects/trondmy/linux-nfs:
NFSv4.1: Handle NFS4ERR_DELAY when resetting the NFSv4.1 session
SUNRPC: When changing the queue priority, ensure that we change the owner
NFS: Don't silently fail setattr() requests on mountpoints
NFSv4.1: Ensure that nfs41_walk_client_list() does start lease recovery
NFSv4: Fix NFSv4 trunking discovery
NFSv4: Fix NFSv4 reference counting for trunked sessions
NFS: Fix error reporting in nfs_xdev_mount
Pull MIPS updates from Ralf Baechle:
"A number of fixes all across the MIPS tree. No area is particularly
standing out and things have cooled down quite nicely for a release."
* 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus:
MIPS: Function tracer: Fix broken function tracing
mips: Move __virt_addr_valid() to a place for MIPS 64
MIPS: Netlogic: Fix UP compilation on XLR
MIPS: AR71xx: Fix AR71XX_PCI_MEM_SIZE
MIPS: AR724x: Fix AR724X_PCI_MEM_SIZE
MIPS: Lantiq: Fix cp0_perfcount_irq mapping
MIPS: DSP: Fix DSP mask for registers.
MIPS: Fix build failure by adding definition of pfn_pmd().
MIPS: Octeon: Fix warning.
MIPS: delay.c: Check BITS_PER_LONG instead of __SIZEOF_LONG__
MIPS: PNX833x: Fix comment.
MIPS: Add struct p_format to union mips_instruction.
MIPS: Export <asm/break.h>.
MIPS: BCM47xx: Enable SSB prerequisite SSB_DRIVER_PCICORE.
MIPS: BCM47xx: Select GPIOLIB for BCMA on bcm47xx platform
MIPS: vpe.c: Fix null pointer dereference in print arguments.
i2c_hid_output_raw_report is used by hidraw to forward set_report requests.
The current implementation of i2c_hid_set_report needs to take the
report_id as an argument. The report_id is stored in the first byte
of the buffer in argument of i2c_hid_output_raw_report.
Not removing the report_id from the given buffer adds this byte 2 times
in the command, leading to a non working command.
Reported-by: Andrew Duggan <aduggan@synaptics.com>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Function tracing is currently broken for all 32 bit MIPS platforms.
When tracing is enabled, the kernel immediately hangs on boot.
This is a result of commit b732d439cb
that changes the kernel/trace/Kconfig file so that is no longer
forces FRAME_POINTER when FUNCTION_TRACING is enabled.
MIPS frame pointers are generally considered to be useless because
they cannot be used to unwind the stack. Unfortunately the MIPS
function tracing code has bugs that are masked by the use of frame
pointers. This commit fixes the bugs so that MIPS frame pointers
don't need to be enabled.
The bugs are a result of the odd calling sequence used to call the trace
routine. This calling sequence is inserted into every traceable function
when the tracing CONFIG option is enabled. This sequence is generated
for 32bit MIPS platforms by the compiler via the "-pg" flag.
Part of the sequence is "addiu sp,sp,-8" in the delay slot after every
call to the trace routine "_mcount" (some legacy thing where 2 arguments
used to be pushed on the stack). The _mcount routine is expected to
adjust the sp by +8 before returning. So when not disabled, the original
jalr and addiu will be there, so _mcount has to adjust sp.
The problem is that when tracing is disabled for a function, the
"jalr _mcount" instruction is replaced with a nop, but the
"addiu sp,sp,-8" is still executed and the stack pointer is left
trashed. When frame pointers are enabled the problem is masked
because any access to the stack is done through the frame
pointer and the stack pointer is restored from the frame pointer when
the function returns.
This patch writes two nops starting at the address of the "jalr _mcount"
instruction whenever tracing is disabled. This means that the
"addiu sp,sp.-8" will be converted to a nop along with the "jalr". When
disabled, there will be two nops.
This is SMP safe because the first time this happens is during
ftrace_init() which is before any other processor has been started.
Subsequent calls to enable/disable tracing when other CPUs ARE running
will still be safe because the enable will only change the first nop
to a "jalr" and the disable, while writing 2 nops, will only be changing
the "jalr". This patch also stops using stop_machine() to call the
tracer enable/disable routines and calls them directly because the
routines are SMP safe.
When the kernel first boots we have to be able to handle the gcc
generated jalr, addui sequence until ftrace_init gets a chance to run
and change the sequence. At this point mcount just adjusts the stack
and returns. When ftrace_init runs, we convert the jalr/addui to nops.
Then whenever tracing is enabled we convert the first nop to a "jalr
mcount+8". The mcount+8 entry point skips the stack adjust.
[ralf@linux-mips.org: Folded in Steven Rostedt's build fix.]
Signed-off-by: Al Cooper <alcooperx@gmail.com>
Cc: rostedt@goodmis.org
Cc: ddaney.cavm@gmail.com
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/4806/
Patchwork: https://patchwork.linux-mips.org/patch/4841/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
When processing write same requests, fix dm to send the configured
number of WRITE SAME requests to the target rather than the number of
discards, which is not always the same.
Device-mapper WRITE SAME support was introduced by commit
23508a96cd ("dm: add WRITE SAME support").
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Acked-by: Mike Snitzer <snitzer@redhat.com>
Commit d3ce884318 "MIPS: Fix modpost error in modules attepting to use
virt_addr_valid()" moved __virt_addr_valid() from a macro in a header
file to a function in ioremap.c. But ioremap.c is only compiled for MIPS
32, and not for MIPS 64.
When compiling for my yeeloong2, which supposedly supports hibernation,
which compiles kernel/power/snapshot.c which calls virt_addr_valid(), I
got this error:
LD init/built-in.o
kernel/built-in.o: In function `memory_bm_free':
snapshot.c:(.text+0x4c9c4): undefined reference to `__virt_addr_valid'
snapshot.c:(.text+0x4ca58): undefined reference to `__virt_addr_valid'
kernel/built-in.o: In function `snapshot_write_next':
(.text+0x4e44c): undefined reference to `__virt_addr_valid'
kernel/built-in.o: In function `snapshot_write_next':
(.text+0x4e890): undefined reference to `__virt_addr_valid'
make[1]: *** [vmlinux] Error 1
make: *** [sub-make] Error 2
I suspect that __virt_addr_valid() is fine for mips 64. I moved it to
mmap.c such that it gets compiled for mips 64 and 32.
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Cc: linux-kernel@vger.kernel.org
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/4842/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
thin_io_hints() is blindly copying the queue limits from the thin-pool
which can lead to incorrect limits being set. The fix here simply
deletes the thin_io_hints() hook which leaves the existing stacking
infrastructure to set the limits correctly.
When a thin-pool uses an MD device for the data device a thin device
from the thin-pool must respect MD's constraints about disallowing a bio
from spanning multiple chunks. Otherwise we can see problems. If the raid0
chunksize is 1152K and thin-pool chunksize is 256K I see the following
md/raid0 error (with extra debug tracing added to thin_endio) when
mkfs.xfs is executed against the thin device:
md/raid0:md99: make_request bug: can't convert block across chunks or bigger than 1152k 6688 127
device-mapper: thin: bio sector=2080 err=-5 bi_size=130560 bi_rw=17 bi_vcnt=32 bi_idx=0
This extra DM debugging shows that the failing bio is spanning across
the first and second logical 1152K chunk (sector 2080 + 255 takes the
bio beyond the first chunk's boundary of sector 2304). So the bio
splitting that DM is doing clearly isn't respecting the MD limits.
max_hw_sectors_kb is 127 for both the thin-pool and thin device
(queue_max_hw_sectors returns 255 so we'll excuse sysfs's lack of
precision). So this explains why bi_size is 130560.
But the thin device's max_hw_sectors_kb should be 4 (PAGE_SIZE) given
that it doesn't have a .merge function (for bio_add_page to consult
indirectly via dm_merge_bvec) yet the thin-pool does sit above an MD
device that has a compulsory merge_bvec_fn. This scenario is exactly
why DM must resort to sending single PAGE_SIZE bios to the underlying
layer. Some additional context for this is available in the header for
commit 8cbeb67a ("dm: avoid unsupported spanning of md stripe boundaries").
Long story short, the reason a thin device doesn't properly get
configured to have a max_hw_sectors_kb of 4 (PAGE_SIZE) is that
thin_io_hints() is blindly copying the queue limits from the thin-pool
device directly to the thin device's queue limits.
Fix this by eliminating thin_io_hints. Doing so is safe because the
block layer's queue limits stacking already enables the upper level thin
device to inherit the thin-pool device's discard and minimum_io_size and
optimal_io_size limits that get set in pool_io_hints. But avoiding the
queue limits copy allows the thin and thin-pool limits to be different
where it is important, namely max_hw_sectors_kb.
Reported-by: Daniel Browning <db@kavod.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Cc: stable@vger.kernel.org
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
