Commit graph

312155 commits

Author SHA1 Message Date
Guenter Roeck 647ff514d8 hwmon: (gl520sm) Convert to use devm_ functions
Convert to use devm_ functions to reduce code size and simplify the code.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Jean Delvare <khali@linux-fr.org>
2012-07-21 21:48:40 -07:00
Guenter Roeck bba636d059 hwmon: (gl518sm) Convert to use devm_ functions
Convert to use devm_ functions to reduce code size and simplify the code.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Jean Delvare <khali@linux-fr.org>
2012-07-21 21:48:39 -07:00
Guenter Roeck 6ecffe1691 hwmon: (emc6w201) Convert to use devm_ functions
Convert to use devm_ functions to reduce code size and simplify the code.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Jean Delvare <khali@linux-fr.org>
2012-07-21 21:48:39 -07:00
Guenter Roeck e20b4b38cd hwmon: (ds1621) Convert to use devm_ functions
Convert to use devm_ functions to reduce code size and simplify the code.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Jean Delvare <khali@linux-fr.org>
2012-07-21 21:48:39 -07:00
Guenter Roeck d466a35305 hwmon: (atxp1) Convert to use devm_ functions
Convert to use devm_ functions to reduce code size and simplify the code.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Jean Delvare <khali@linux-fr.org>
2012-07-21 21:48:39 -07:00
Guenter Roeck e5ebb772c6 hwmon: (adm9240) Convert to use devm_ functions
Convert to use devm_ functions to reduce code size and simplify the code.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Jean Delvare <khali@linux-fr.org>
2012-07-21 21:48:39 -07:00
Guenter Roeck dc2fd66327 hwmon: (adm1031) Convert to use devm_ functions
Convert to use devm_ functions to reduce code size and simplify the code.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Jean Delvare <khali@linux-fr.org>
2012-07-21 21:48:39 -07:00
Guenter Roeck 3421e212e6 hwmon: (adm1026) Convert to use devm_ functions
Convert to use devm_ functions to reduce code size and simplify the code.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Jean Delvare <khali@linux-fr.org>
2012-07-21 21:48:39 -07:00
Guenter Roeck 06ce97d608 hwmon: (adm1021) Convert to use devm_ functions
Convert to use devm_ functions to reduce code size and simplify the code.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Jean Delvare <khali@linux-fr.org>
2012-07-21 21:48:39 -07:00
Guenter Roeck 4cb14a3a65 hwmon: (w83795) Convert to use devm_ functions
Convert to use devm_ functions to reduce code size and simplify the code.

Cc: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Jean Delvare <khali@linux-fr.org>
2012-07-21 21:48:39 -07:00
Guenter Roeck 20f426ff02 hwmon: (lm90) Convert to use devm_ functions
Convert to use devm_ functions to reduce code size and simplify the code.

Cc: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Jean Delvare <khali@linux-fr.org>
2012-07-21 21:48:38 -07:00
Guenter Roeck c087f73a24 hwmon: (lm83) Convert to use devm_ functions
Convert to use devm_ functions to reduce code size and simplify the code.

Cc: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Jean Delvare <khali@linux-fr.org>
2012-07-21 21:48:38 -07:00
Guenter Roeck adc1413279 hwmon: (f71805f) Convert to use devm_ functions
Convert to use devm_ functions to reduce code size and simplify the code.

Cc: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Jean Delvare <khali@linux-fr.org>
2012-07-21 21:48:38 -07:00
Guenter Roeck 7b7bb90ca3 hwmon: (lm78) Convert to use devm_ functions
Convert to use devm_ functions to reduce code size and simplify the code.

Cc: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Jean Delvare <khali@linux-fr.org>
2012-07-21 21:48:38 -07:00
Guenter Roeck e3ecb2eeed hwmon: (adt7475) Convert to use devm_ functions
Convert to use devm_ functions to reduce code size and simplify the code.

Cc: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Jean Delvare <khali@linux-fr.org>
2012-07-21 21:48:38 -07:00
Guenter Roeck 6702c9981e hwmon: (adm1025) Convert to use devm_ functions
Convert to use devm_ functions to reduce code size and simplify the code.

Cc: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Jean Delvare <khali@linux-fr.org>
2012-07-21 21:48:38 -07:00
Guenter Roeck 61d4d17ea9 hwmon: (pc87360) Convert to use devm_ functions
Convert to use devm_ functions to reduce code size and simplify the code.

Cc: Jim Cromie <jim.cromie@gmail.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Tested-by: Jim Cromie <jim.cromie@gmail.com>
2012-07-21 21:48:38 -07:00
Guenter Roeck ed2e073b13 hwmon: (mc13783-adc.c) Convert to use devm_ functions
Convert to use devm_ functions to reduce code size and simplify the code.

Cc: Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de>
2012-07-21 21:48:38 -07:00
Guenter Roeck b07405fbc3 hwmon: (max6639) Convert to use devm_ functions
Convert to use devm_ functions to reduce code size and simplify the code.

Cc: Roland Stigge <stigge@antcom.de>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Roland Stigge <stigge@antcom.de>
2012-07-21 21:48:38 -07:00
Guenter Roeck 94cd52027a hwmon: (max6650) Convert to use devm_ functions
Convert to use devm_ functions to reduce code size and simplify the code.

Cc: Hans J. Koch <hjk@hansjkoch.de>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Hans J. Koch <hjk@hansjkoch.de>
2012-07-21 21:48:37 -07:00
Guenter Roeck e7d5bf7ed5 hwmon: (wm831x-hwmon) Convert to use devm_ functions
Convert to use devm_ functions to reduce code size and simplify the code.

Cc: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2012-07-21 21:48:37 -07:00
Ashish Jangam e41f6432d1 hwmon: Driver for DA9052/53 PMIC
The DA9052 PMIC provides an Analogue to Digital Converter with 10 bits
resolution and 10 channels.

This patch monitors the DA9052 PMIC's ADC channels mostly for battery
parameters like battery temperature, junction temperature, battery
current etc.

This patch is functionally tested on Samsung SMDKV6410

Signed-off-by: David Dajun Chen <dchen@diasemi.com>
Signed-off-by: Ashish Jangam <ashish.jangam@kpitcummins.com>
[Guenter Roeck: __init --> __devinit for probe function]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
2012-07-21 21:48:37 -07:00
Guenter Roeck 62867d491a hwmon: (fam15h_power) Fix unintentional integer overflow
Expression with two unsigned integer variables is calculated as unsigned integer
before it is converted to u64. This may result in an integer overflow.
Fix by typecasting the left operand to u64 before performing the left shift.

This patch addresses Coverity #402320: Unintentional integer overflow.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Jean Delvare <khali@linux-fr.org>
Acked-by: Andreas Herrmann <andreas.herrmann3@amd.com>
2012-07-21 21:48:28 -07:00
Guenter Roeck 58c3667d83 hwmon: (w83627ehf) Add missing break statement
A case statement in nct6775_write_fan_div() is missing a break. Fix it.

This patch addresses Coverity #141439: Missing break in switch.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Jean Delvare <khali@linux-fr.org>
2012-07-21 21:48:28 -07:00
Linus Torvalds 28a33cbc24 Linux 3.5 2012-07-21 13:58:29 -07:00
Rafael J. Wysocki bff9d18656 Remove SYSTEM_SUSPEND_DISK system state
The SYSTEM_SUSPEND_DISK system state is never used, so drop it.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-07-21 13:58:17 -07:00
Linus Torvalds 9a2bc8603e Merge branch 'anton-kgdb' (kgdb dmesg fixups)
Merge emailed kgdb dmesg fixups patches from Anton Vorontsov:
 "The dmesg command appears to be broken after the printk rework.  The
  old logic in the kdb code makes no sense in terms of current
  printk/logging storage format, and KDB simply hangs forever upon
  entering 'dmesg' command.

  The first patch revives the command by switching to kmsg_dumper
  iterator.  As a side-effect, the code is now much more simpler.

  A few changes were needed in the printk.c: we needed unlocked variant
  of the kmsg_dumper iterator, but these can surely wait for 3.6.

  It's probably too late even for the first patch to go to 3.5, but I'll
  try to convince otherwise.  :-) Here we go:

   - The current code is broken for sure, and has no hope to work at
     all.  It is a regression
   - The new code works for me, and probably works for everyone else;
   - If it compiles (and I urge everyone to compile-test it on your
     setup), it hardly can make things worse."

* Merge emailed patches from Anton Vorontsov: (4 commits)
  kdb: Switch to nolock variants of kmsg_dump functions
  printk: Implement some unlocked kmsg_dump functions
  printk: Remove kdb_syslog_data
  kdb: Revive dmesg command
2012-07-21 10:34:13 -07:00
Anton Vorontsov c064da4714 kdb: Switch to nolock variants of kmsg_dump functions
The locked variants are prone to deadlocks (suppose we got to the
debugger w/ the logbuf lock held), so let's switch to nolock variants.

Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-07-21 10:34:00 -07:00
Anton Vorontsov 533827c921 printk: Implement some unlocked kmsg_dump functions
If used from KDB, the locked variants are prone to deadlocks (suppose we
got to the debugger w/ the logbuf lock held).

So, we have to implement a few routines that grab no logbuf lock.

Yet we don't need these functions in modules, so we don't export them.

Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-07-21 10:34:00 -07:00
Anton Vorontsov 1b499d05ee printk: Remove kdb_syslog_data
The function is no longer needed, so remove it.

Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-07-21 10:34:00 -07:00
Anton Vorontsov bc792e612e kdb: Revive dmesg command
The kgdb dmesg command is broken after the printk rework.  The old logic
in kdb code makes no sense in terms of current printk/logging storage
format, and KDB simply hangs forever.

This patch revives the command by switching to kmsg_dumper iterator.

The code is now much more simpler and shorter.

Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-07-21 10:34:00 -07:00
Linus Torvalds d75e2c9ad9 Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus
Pull late MIPS fixes from Ralf Baechle:
 "This fixes a number of lose ends in the MIPS code and various bug
  fixes.

  Aside of dropping some patch that should not be in this pull request
  everything has sat in -next for quite a while and there are no known
  issues.

  The biggest patch in this patch set moves the allocation of an array
  that is aliased to a function (for runtime generated code) to
  assembler code.  This avoids an issue with certain toolchains when
  building for microMIPS."

* 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus: (35 commits)
  MIPS: PCI: Move fixups from __init to __devinit.
  MIPS: Fix bug.h MIPS build regression
  MIPS: sync-r4k: remove redundant irq operation
  MIPS: smp: Warn on too early irq enable
  MIPS: call set_cpu_online() on cpu being brought up with irq disabled
  MIPS: call ->smp_finish() a little late
  MIPS: Yosemite: delay irq enable to ->smp_finish()
  MIPS: SMTC: delay irq enable to ->smp_finish()
  MIPS: BMIPS: delay irq enable to ->smp_finish()
  MIPS: Octeon: delay enable irq to ->smp_finish()
  MIPS: Oprofile: Fix build as a module.
  MIPS: BCM63XX: Fix BCM6368 IPSec clock bit
  MIPS: perf: Fix build error caused by unused counters_per_cpu_to_total()
  MIPS: Fix Magic SysRq L kernel crash.
  MIPS: BMIPS: Fix duplicate header inclusion.
  mips: mark const init data with __initconst instead of __initdata
  MIPS: cmpxchg.h: Add missing include
  MIPS: Malta may also be equipped with MIPS64 R2 processors.
  MIPS: Fix typo multipy -> multiply
  MIPS: Cavium: Fix duplicate ARCH_SPARSEMEM_ENABLE in kconfig.
  ...
2012-07-20 12:02:02 -07:00
Linus Torvalds 935173744a Three fixes for device-mapper discard processing:
- avoid a crash in dm-raid1 when discards coincide with mirror recovery;
   - avoid discarding shared data that's still needed in dm-thin;
   - don't guarantee that discarded blocks will be wiped in dm-raid1.
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Merge tag 'dm-3.5-fixes-2' of git://git.kernel.org/pub/scm/linux/kernel/git/agk/linux-dm

Pull device-mapper discard fixes from Alasdair G Kergon:
  - avoid a crash in dm-raid1 when discards coincide with mirror
    recovery;
  - avoid discarding shared data that's still needed in dm-thin;
  - don't guarantee that discarded blocks will be wiped in dm-raid1.

* tag 'dm-3.5-fixes-2' of git://git.kernel.org/pub/scm/linux/kernel/git/agk/linux-dm:
  dm raid1: set discard_zeroes_data_unsupported
  dm thin: do not send discards to shared blocks
  dm raid1: fix crash with mirror recovery and discard
2012-07-20 11:51:22 -07:00
Linus Torvalds ce9f8d6b39 Merge branch 'for-linus' of git://git.open-osd.org/linux-open-osd
Pull pnfs/ore fixes from Boaz Harrosh:
 "These are catastrophic fixes to the pnfs objects-layout that were just
  discovered.  They are also destined for @stable.

  I have found these and worked on them at around RC1 time but
  unfortunately went to the hospital for kidney stones and had a very
  slow recovery.  I refrained from sending them as is, before proper
  testing, and surly I have found a bug just yesterday.

  So now they are all well tested, and have my sign-off.  Other then
  fixing the problem at hand, and assuming there are no bugs at the new
  code, there is low risk to any surrounding code.  And in anyway they
  affect only these paths that are now broken.  That is RAID5 in pnfs
  objects-layout code.  It does also affect exofs (which was not broken)
  but I have tested exofs and it is lower priority then objects-layout
  because no one is using exofs, but objects-layout has lots of users."

* 'for-linus' of git://git.open-osd.org/linux-open-osd:
  pnfs-obj: Fix __r4w_get_page when offset is beyond i_size
  pnfs-obj: don't leak objio_state if ore_write/read fails
  ore: Unlock r4w pages in exact reverse order of locking
  ore: Remove support of partial IO request (NFS crash)
  ore: Fix NFS crash by supporting any unaligned RAID IO
2012-07-20 11:43:53 -07:00
Linus Torvalds 1793416287 Fix a bug in UBIFS free space fix-up reported already twice recently:
http://lists.infradead.org/pipermail/linux-mtd/2012-May/041408.html
 http://lists.infradead.org/pipermail/linux-mtd/2012-June/042422.html
 
 and we finally have the fix. I am quite confident the fix is correct
 because I could reproduce the problem with nandsim and verify the
 fix. It was also verified by Iwo (the reporter).
 
 I am also confident that this is OK to merge the fix so late because
 this patch affects only the fixup functionality, which is not used by
 most users.
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Merge tag 'upstream-3.5-rc8' of git://git.infradead.org/linux-ubifs

Pull UBIFS free space fix-up bugfix from Artem Bityutskiy:
 "It's been reported already twice recently:

    http://lists.infradead.org/pipermail/linux-mtd/2012-May/041408.html
    http://lists.infradead.org/pipermail/linux-mtd/2012-June/042422.html

  and we finally have the fix.  I am quite confident the fix is correct
  because I could reproduce the problem with nandsim and verify the fix.
  It was also verified by Iwo (the reporter).

  I am also confident that this is OK to merge the fix so late because
  this patch affects only the fixup functionality, which is not used by
  most users."

* tag 'upstream-3.5-rc8' of git://git.infradead.org/linux-ubifs:
  UBIFS: fix a bug in empty space fix-up
2012-07-20 11:42:30 -07:00
Mikulas Patocka 7c8d3a42fe dm raid1: set discard_zeroes_data_unsupported
We can't guarantee that REQ_DISCARD on dm-mirror zeroes the data even if
the underlying disks support zero on discard.  So this patch sets
ti->discard_zeroes_data_unsupported.

For example, if the mirror is in the process of resynchronizing, it may
happen that kcopyd reads a piece of data, then discard is sent on the
same area and then kcopyd writes the piece of data to another leg.
Consequently, the data is not zeroed.

The flag was made available by commit 983c7db347
(dm crypt: always disable discard_zeroes_data).

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Cc: stable@kernel.org
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
2012-07-20 14:25:07 +01:00
Mikulas Patocka 650d2a06b4 dm thin: do not send discards to shared blocks
When process_discard receives a partial discard that doesn't cover a
full block, it sends this discard down to that block. Unfortunately, the
block can be shared and the discard would corrupt the other snapshots
sharing this block.

This patch detects block sharing and ends the discard with success when
sending it to the shared block.

The above change means that if the device supports discard it can't be
guaranteed that a discard request zeroes data. Therefore, we set
ti->discard_zeroes_data_unsupported.

Thin target discard support with this bug arrived in commit
104655fd4d (dm thin: support discards).

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Cc: stable@kernel.org
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
2012-07-20 14:25:05 +01:00
Mikulas Patocka 751f188dd5 dm raid1: fix crash with mirror recovery and discard
This patch fixes a crash when a discard request is sent during mirror
recovery.

Firstly, some background.  Generally, the following sequence happens during
mirror synchronization:
- function do_recovery is called
- do_recovery calls dm_rh_recovery_prepare
- dm_rh_recovery_prepare uses a semaphore to limit the number
  simultaneously recovered regions (by default the semaphore value is 1,
  so only one region at a time is recovered)
- dm_rh_recovery_prepare calls __rh_recovery_prepare,
  __rh_recovery_prepare asks the log driver for the next region to
  recover. Then, it sets the region state to DM_RH_RECOVERING. If there
  are no pending I/Os on this region, the region is added to
  quiesced_regions list. If there are pending I/Os, the region is not
  added to any list. It is added to the quiesced_regions list later (by
  dm_rh_dec function) when all I/Os finish.
- when the region is on quiesced_regions list, there are no I/Os in
  flight on this region. The region is popped from the list in
  dm_rh_recovery_start function. Then, a kcopyd job is started in the
  recover function.
- when the kcopyd job finishes, recovery_complete is called. It calls
  dm_rh_recovery_end. dm_rh_recovery_end adds the region to
  recovered_regions or failed_recovered_regions list (depending on
  whether the copy operation was successful or not).

The above mechanism assumes that if the region is in DM_RH_RECOVERING
state, no new I/Os are started on this region. When I/O is started,
dm_rh_inc_pending is called, which increases reg->pending count. When
I/O is finished, dm_rh_dec is called. It decreases reg->pending count.
If the count is zero and the region was in DM_RH_RECOVERING state,
dm_rh_dec adds it to the quiesced_regions list.

Consequently, if we call dm_rh_inc_pending/dm_rh_dec while the region is
in DM_RH_RECOVERING state, it could be added to quiesced_regions list
multiple times or it could be added to this list when kcopyd is copying
data (it is assumed that the region is not on any list while kcopyd does
its jobs). This results in memory corruption and crash.

There already exist bypasses for REQ_FLUSH requests: REQ_FLUSH requests
do not belong to any region, so they are always added to the sync list
in do_writes. dm_rh_inc_pending does not increase count for REQ_FLUSH
requests. In mirror_end_io, dm_rh_dec is never called for REQ_FLUSH
requests. These bypasses avoid the crash possibility described above.

These bypasses were improperly implemented for REQ_DISCARD when
the mirror target gained discard support in commit
5fc2ffeabb (dm raid1: support discard).

In do_writes, REQ_DISCARD requests is always added to the sync queue and
immediately dispatched (even if the region is in DM_RH_RECOVERING).  However,
dm_rh_inc and dm_rh_dec is called for REQ_DISCARD resusts.  So it violates the
rule that no I/Os are started on DM_RH_RECOVERING regions, and causes the list
corruption described above.

This patch changes it so that REQ_DISCARD requests follow the same path
as REQ_FLUSH. This avoids the crash.

Reference: https://bugzilla.redhat.com/837607

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Cc: stable@kernel.org
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
2012-07-20 14:25:03 +01:00
Boaz Harrosh c999ff6802 pnfs-obj: Fix __r4w_get_page when offset is beyond i_size
It is very common for the end of the file to be unaligned on
stripe size. But since we know it's beyond file's end then
the XOR should be preformed with all zeros.

Old code used to just read zeros out of the OSD devices, which is a great
waist. But what scares me more about this situation is that, we now have
pages attached to the file's mapping that are beyond i_size. I don't
like the kind of bugs this calls for.

Fix both birds, by returning a global zero_page, if offset is beyond
i_size.

TODO:
	Change the API to ->__r4w_get_page() so a NULL can be
	returned without being considered as error, since XOR API
	treats NULL entries as zero_pages.

[Bug since 3.2. Should apply the same way to all Kernels since]
CC: Stable Tree <stable@kernel.org>
Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
2012-07-20 11:50:31 +03:00
Boaz Harrosh 9909d45a85 pnfs-obj: don't leak objio_state if ore_write/read fails
[Bug since 3.2 Kernel]
CC: Stable Tree <stable@kernel.org>
Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
2012-07-20 11:50:30 +03:00
Boaz Harrosh 537632e0a5 ore: Unlock r4w pages in exact reverse order of locking
The read-4-write pages are locked in address ascending order.
But where unlocked in a way easiest for coding. Fix that,
locks should be released in opposite order of locking, .i.e
descending address order.

I have not hit this dead-lock. It was found by inspecting the
dbug print-outs. I suspect there is an higher lock at caller that
protects us, but fix it regardless.

Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
2012-07-20 11:49:25 +03:00
Boaz Harrosh 62b62ad873 ore: Remove support of partial IO request (NFS crash)
Do to OOM situations the ore might fail to allocate all resources
needed for IO of the full request. If some progress was possible
it would proceed with a partial/short request, for the sake of
forward progress.

Since this crashes NFS-core and exofs is just fine without it just
remove this contraption, and fail.

TODO:
	Support real forward progress with some reserved allocations
	of resources, such as mem pools and/or bio_sets

[Bug since 3.2 Kernel]
CC: Stable Tree <stable@kernel.org>
CC: Benny Halevy <bhalevy@tonian.com>
Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
2012-07-20 11:47:43 +03:00
Boaz Harrosh 9ff19309a9 ore: Fix NFS crash by supporting any unaligned RAID IO
In RAID_5/6 We used to not permit an IO that it's end
byte is not stripe_size aligned and spans more than one stripe.
.i.e the caller must check if after submission the actual
transferred bytes is shorter, and would need to resubmit
a new IO with the remainder.

Exofs supports this, and NFS was supposed to support this
as well with it's short write mechanism. But late testing has
exposed a CRASH when this is used with none-RPC layout-drivers.

The change at NFS is deep and risky, in it's place the fix
at ORE to lift the limitation is actually clean and simple.
So here it is below.

The principal here is that in the case of unaligned IO on
both ends, beginning and end, we will send two read requests
one like old code, before the calculation of the first stripe,
and also a new site, before the calculation of the last stripe.
If any "boundary" is aligned or the complete IO is within a single
stripe. we do a single read like before.

The code is clean and simple by splitting the old _read_4_write
into 3 even parts:
1._read_4_write_first_stripe
2. _read_4_write_last_stripe
3. _read_4_write_execute

And calling 1+3 at the same place as before. 2+3 before last
stripe, and in the case of all in a single stripe then 1+2+3
is preformed additively.

Why did I not think of it before. Well I had a strike of
genius because I have stared at this code for 2 years, and did
not find this simple solution, til today. Not that I did not try.

This solution is much better for NFS than the previous supposedly
solution because the short write was dealt  with out-of-band after
IO_done, which would cause for a seeky IO pattern where as in here
we execute in order. At both solutions we do 2 separate reads, only
here we do it within a single IO request. (And actually combine two
writes into a single submission)

NFS/exofs code need not change since the ORE API communicates the new
shorter length on return, what will happen is that this case would not
occur anymore.

hurray!!

[Stable this is an NFS bug since 3.2 Kernel should apply cleanly]
CC: Stable Tree <stable@kernel.org>
Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
2012-07-20 11:45:28 +03:00
Artem Bityutskiy c6727932cf UBIFS: fix a bug in empty space fix-up
UBIFS has a feature called "empty space fix-up" which is a quirk to work-around
limitations of dumb flasher programs. Namely, of those flashers that are unable
to skip NAND pages full of 0xFFs while flashing, resulting in empty space at
the end of half-filled eraseblocks to be unusable for UBIFS. This feature is
relatively new (introduced in v3.0).

The fix-up routine (fixup_free_space()) is executed only once at the very first
mount if the superblock has the 'space_fixup' flag set (can be done with -F
option of mkfs.ubifs). It basically reads all the UBIFS data and metadata and
writes it back to the same LEB. The routine assumes the image is pristine and
does not have anything in the journal.

There was a bug in 'fixup_free_space()' where it fixed up the log incorrectly.
All but one LEB of the log of a pristine file-system are empty. And one
contains just a commit start node. And 'fixup_free_space()' just unmapped this
LEB, which resulted in wiping the commit start node. As a result, some users
were unable to mount the file-system next time with the following symptom:

UBIFS error (pid 1): replay_log_leb: first log node at LEB 3:0 is not CS node
UBIFS error (pid 1): replay_log_leb: log error detected while replaying the log at LEB 3:0

The root-cause of this bug was that 'fixup_free_space()' wrongly assumed
that the beginning of empty space in the log head (c->lhead_offs) was known
on mount. However, it is not the case - it was always 0. UBIFS does not store
in it the master node and finds out by scanning the log on every mount.

The fix is simple - just pass commit start node size instead of 0 to
'fixup_leb()'.

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@linux.intel.com>
Cc: stable@vger.kernel.org [v3.0+]
Reported-by: Iwo Mergler <Iwo.Mergler@netcommwireless.com>
Tested-by: Iwo Mergler <Iwo.Mergler@netcommwireless.com>
Reported-by: James Nute <newten82@gmail.com>
2012-07-20 10:13:27 +03:00
Linus Torvalds 85efc72a02 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client
Pull last minute Ceph fixes from Sage Weil:
 "The important one fixes a bug in the socket failure handling behavior
  that was turned up in some recent failure injection testing.  The
  other two are minor bug fixes."

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client:
  rbd: endian bug in rbd_req_cb()
  rbd: Fix ceph_snap_context size calculation
  libceph: fix messenger retry
2012-07-19 16:11:28 -07:00
Linus Torvalds 3e4b9459fb md: 3 bugfixes for 3.5-rc
One of the bugs was introduced in 3.5-rc1.  Others have
 been there for longer.
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Merge tag 'md-3.5-fixes' of git://neil.brown.name/md

Pull three md bugfixes from NeilBrown:
 "One of the bugs was introduced in 3.5-rc1.  Others have been there for
  longer."

* tag 'md-3.5-fixes' of git://neil.brown.name/md:
  md/raid1: close some possible races on write errors during resync
  md: avoid crash when stopping md array races with closing other open fds.
  md: fix bug in handling of new_data_offset
2012-07-19 08:27:13 -07:00
Linus Torvalds 309d4b000b Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
Pull networking changes from David Miller:
 "Ok, we should be good to go now"

1) We have to statically initialize the init_net device list head rather
   than do so in an initcall, otherwise netprio_cgroup crashes if it's
   built statically rather than modular (Mark D.  Rustad)

2) Fix SKB null oopser in CIPSO ipv4 option processing (Paul Moore)

3) Qlogic maintainers update (Anirban Chakraborty)

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net:
  net: Statically initialize init_net.dev_base_head
  MAINTAINERS: Changes in qlcnic and qlge maintainers list
  cipso: don't follow a NULL pointer when setsockopt() is called
2012-07-19 08:21:13 -07:00
Linus Torvalds 61c901c569 Merge branch 'upstream-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid
Pull HID update from Jiri Kosina:
 "A final round of changes for HID for 3.5: just device ID additions."

* 'upstream-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid:
  HID: hid-multitouch: add support for Zytronic panels
  HID: add Sennheiser BTD500USB device support
  HID: add battery quirk for Apple Wireless ANSI
2012-07-19 08:15:55 -07:00
Ezequiel Garcia 380e99fc44 cx25821: Remove bad strcpy to read-only char*
The strcpy was being used to set the name of the board.  Since the
destination char* was read-only and the name is set statically at
compile time; this was both wrong and redundant.

The type of char* is changed to const char* to prevent future errors.

Reported-by: Radek Masin <radek@masin.eu>
Signed-off-by: Ezequiel Garcia <elezegarcia@gmail.com>
[ Taking directly due to vacations   - Linus ]
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-07-19 08:15:33 -07:00
Benjamin Tissoires e9a09aed3e HID: hid-multitouch: add support for Zytronic panels
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@enac.fr>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2012-07-19 13:56:16 +02:00