When a process tries to read/write a disconnected i2c device, it receives a signal (e.g. ctrl-c) and the kernel gets stuck.

BUG: soft lockup - CPU#0 stuck for 61s! [I2CEEpromTest:392]
NIP: c01628f8 LR: c01628f0 CTR: c00177cc
REGS: c39abd70 TRAP: 0901   Not tainted  (2.6.25.7-alcore)
MSR: 00009032 <EE,ME,IR,DR>  CR: 42042048  XER: 20000000
TASK = c3889bd0[392] 'I2CEEpromTest' THREAD: c39aa000
GPR00: 00009000 c39abe20 c3889bd0 c39075c8 c39abe28 00000001 00000000 00000001
GPR08: c3889bd0 c39075c8 00009032 c39abe34 00002437
NIP [c01628f8] cpm_i2c_xfer+0x5fc/0x6d0
LR [c01628f0] cpm_i2c_xfer+0x5f4/0x6d0
Call Trace:
[c39abe20] [c0162924] cpm_i2c_xfer+0x628/0x6d0 (unreliable)
[c39abe90] [c015f6a0] i2c_transfer+0x88/0xb4
[c39abeb0] [c0160164] i2c_master_recv+0x48/0x6c
[c39abed0] [c01618dc] i2cdev_read+0x50/0xe4
[c39abef0] [c0068b24] vfs_read+0xc4/0x108
[c39abf10] [c0068f4c] sys_read+0x4c/0x90
[c39abf40] [c000d348] ret_from_syscall+0x0/0x38
Instruction dump:
3bc00064 92610010 3bf201c8 92810014 3b61

This happen because though the wait_event_interruptible_timeout takes the
signals into account, the driver does not handle them.
We propose to change the wait_event_interruptible_timeout with
wait_event_timeout, leaving the signals to be handled in other points
on the upper layers.
Signed-off-by: Bruno Morelli <bruno@evidence.eu.com>
Signed-off-by: Michael Trimarchi <michael@evidence.eu.com>
Acked-by: Jochen Friedrich <jochen@scram.de>
[ben-linux@fluff.org: fix title for patch]
Signed-off-by: Ben Dooks <ben-linux@fluff.org>

Hi Ben,

Can you please queue this fix?

Thanks,

Tony

>From ffe2b2cdf6283770b70a197e3748c6b40a1006be Mon Sep 17 00:00:00 2001
From: Tony Lindgren <tony@atomide.com>
Date: Wed, 17 Jun 2009 13:14:23 +0300
Subject: [PATCH] i2c-omap: Fix build breaking typo in cpu_is_omap_2430

Commit 84bf2c86 introduced a typo, it should be cpu_is_omap2430
instead. The typo was probably caused by a mismerge.

Without this patch all omaps fail to build with:
error: implicit declaration of function 'cpu_is_omap_2430'
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/drzeus/mmc:
  sdhci: remove needless double parenthesis
  sdhci: Specific quirk vor VIA SDHCI controller in VX855ES
  s3cmci: fix dma configuration call
  mmc: Add new via-sdmmc host controller driver
  sdhci: Add support for hosts that are only capable of 1-bit transfers
  MAINTAINERS: add myself as atmel-mci maintainer (sd/mmc interface)
  sdhci: Add SDHCI_QUIRK_NO_MULTIBLOCK quirk
  sdhci: Add better ADMA error reporting
  sdhci-s3c: Samsung S3C based SDHCI controller glue

* git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6:
  crypto: aes-ni - Remove CRYPTO_TFM_REQ_MAY_SLEEP from fpu template
  crypto: aes-ni - Do not sleep when using the FPU
  crypto: aes-ni - Fix cbc mode IV saving
  crypto: padlock-aes - work around Nano CPU errata in CBC mode
  crypto: padlock-aes - work around Nano CPU errata in ECB mode

Merge branch 'core-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

* 'core-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  lockdep: Select frame pointers on x86
  dma-debug: be more careful when building reference entries
  dma-debug: check for sg_call_ents in best-fit algorithm too

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-2.6:
  ALSA: hda - Add model=6530g option
  ALSA: hda - Acer Inspire 6530G model for Realtek ALC888
  ALSA: snd_usb_caiaq: fix legacy input streaming
  ASoC: Kill BUS_ID_SIZE
  ALSA: HDA - Correct trivial typos in comments.
  ALSA: HDA - Name-fixes in code (tagra/targa)
  ALSA: HDA - Add pci-quirk for MSI MS-7350 motherboard.
  ALSA: hda - Fix memory leak at codec creation

This allows the callers to now pass down the full set of FAULT_FLAG_xyz
flags to handle_mm_fault().  All callers have been (mechanically)
converted to the new calling convention, there's almost certainly room
for architectures to clean up their code and then add FAULT_FLAG_RETRY
when that support is added.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

The fault handling routines really want more fine-grained flags than a
single "was it a write fault" boolean - the callers will want to set
flags like "you can return a retry error" etc.

And that's actually how the VM works internally, but right now the
top-level fault handling functions in mm/memory.c all pass just the
'write_access' boolean around.

This switches them over to pass around the FAULT_FLAG_xyzzy 'flags'
variable instead.  The 'write_access' calling convention still exists
for the exported 'handle_mm_fault()' function, but that is next.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

31a985f "ipc: use __ARCH_WANT_IPC_PARSE_VERSION in ipc/util.h" would
choose the implementation of ipc_parse_version() based on a symbol
defined in <asm/unistd.h>.

But it failed to also include this header and thus broke
IPC_64-passing 32-bit userspace because the flag wasn't masked out
properly anymore and the command not understood.

Include <linux/unistd.h> to give the architecture a chance to ask for
the no-no-op ipc_parse_version().
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Signed-off-by: Pierre Ossman <pierre@ossman.eu>

The SDHCI controller found in the VX855ES requires 10ms
delay between applying power and applying clock.

This issue has been discovered and documented by the OLPC XO1.5 team.
Signed-off-by: Harald Welte <HaraldWelte@viatech.com>
Signed-off-by: Pierre Ossman <pierre@ossman.eu>

This was missed in the DMA changes during the s3c24xx
updates in commit 8970ef47.
Signed-off-by: Ben Dooks <ben@simtec.co.uk>
Signed-off-by: Pierre Ossman <pierre@ossman.eu>

This adds the via-sdmmc driver for the SD/MMC-controller of VIA,
which is found in a number of recent integrated VIA chipset
products.
Signed-off-by: Harald Welte <HaraldWelte@viatech.com>
Signed-off-by: Pierre Ossman <pierre@ossman.eu>

Some hosts (hardware configurations, or particular SD/MMC slots) may
not support 4-bit bus. For example, on MPC8569E-MDS boards we can
switch between serial (1-bit only) and nibble (4-bit) modes, thought
we have to disable more peripherals to work in 4-bit mode.

Along with some small core changes, this patch modifies sdhci-of
driver, so that now it looks for "sdhci,1-bit-only" property in the
device-tree, and if specified we enable a proper quirk.
Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Pierre Ossman <pierre@ossman.eu>

Add MAINTAINERS entry for atmel-mci driver.
This driver was maintained by its author: Haavard Skinnemoen. I take the
maintainance of it.
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Acked-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
Signed-off-by: Pierre Ossman <pierre@ossman.eu>

Add quirk to show the controller cannot do multi-block IO.

This is mainly for the Samsung SDHCI controller that currently
cannot manage to do multi-block PIO without timing out.
Signed-off-by: Ben Dooks <ben@simtec.co.uk>
Signed-off-by: Pierre Ossman <pierre@ossman.eu>

Update the ADMA error reporting to not only show the
overall controller state but also to print the ADMA
descriptor list.
Signed-off-by: Ben Dooks <ben@simtec.co.uk>
Signed-off-by: Pierre Ossman <pierre@ossman.eu>

Add support for the 'HSMMC' block(s) in the Samsung SoC
line. These are compatible with the SDHCI driver so add
the necessary setup and driver binding for the platform
devices.
Signed-off-by: Ben Dooks <ben@simtec.co.uk>
Signed-off-by: Pierre Ossman <pierre@ossman.eu>

* topic/hda:
  ALSA: hda - Add model=6530g option
  ALSA: hda - Acer Inspire 6530G model for Realtek ALC888
  ALSA: HDA - Correct trivial typos in comments.
  ALSA: HDA - Name-fixes in code (tagra/targa)
  ALSA: HDA - Add pci-quirk for MSI MS-7350 motherboard.
  ALSA: hda - Fix memory leak at codec creation

* topic/caiaq:
  ALSA: snd_usb_caiaq: fix legacy input streaming

* topic/asoc:
  ASoC: Kill BUS_ID_SIZE

Add the new model string corresponding to the previous Acer Aspire
6530G support.
Signed-off-by: Takashi Iwai <tiwai@suse.de>

The selected 4930G model seemed to keep the subwoofer 'tuba'
function from operating correctly. Removing the existing PCI
ID match made this work again, but it was mapped to 'Side'
instead of to LFE as one would expect.
This attempts to enable all functionality and keep the amount
of available mixer sliders low. Any slider that had no audible
effect on the output audio has been removed, and as such EAPD
is not currently enabled.
Signed-off-by: Tony Vroon <tony@linx.net>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

x86 stack traces are a piece of crap without frame pointers, and its not
like the 'performance gain' of not having stack pointers matters when you
selected lockdep.
Reported-by: Andrew Morton <akpm@linux-foundation.org>
LKML-Reference: <new-submission>
Cc: <stable@kernel.org>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

da456f14 "page allocator: do not disable interrupts in free_page_mlock()" moved
the PG_mlocked clearing after the flag sanity checking which makes mlocked
pages always trigger 'bad page'.  Fix this by clearing the bit up front.
Reported--and-debugged-by: Peter Chubb <peter.chubb@nicta.com.au>
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Mel Gorman <mel@csn.ul.ie>
Tested-by: Maxim Levitsky <maximlevitsky@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

The discussion about using "access_ok()" in get_user_pages_fast() (see
commit 7f818906: "x86: don't use
'access_ok()' as a range check in get_user_pages_fast()" for details and
end result), made us notice that x86-64 was really being very sloppy
about virtual address checking.

So be way more careful and straightforward about masking x86-64 virtual
addresses:

 - All the VIRTUAL_MASK* variants now cover half of the address
   space, it's not like we can use the full mask on a signed
   integer, and the larger mask just invites mistakes when
   applying it to either half of the 48-bit address space.

 - /proc/kcore's kc_offset_to_vaddr() becomes a lot more
   obvious when it transforms a file offset into a
   (kernel-half) virtual address.

 - Unify/simplify the 32-bit and 64-bit USER_DS definition to
   be based on TASK_SIZE_MAX.

This cleanup and more careful/obvious user virtual address checking also
uncovered a buglet in the x86-64 implementation of strnlen_user(): it
would do an "access_ok()" check on the whole potential area, even if the
string itself was much shorter, and thus return an error even for valid
strings. Our sloppy checking had hidden this.

So this fixes 'strnlen_user()' to do this properly, the same way we
already handled user strings in 'strncpy_from_user()'.  Namely by just
checking the first byte, and then relying on fault handling for the
rest.  That always works, since we impose a guard page that cannot be
mapped at the end of the user space address space (and even if we
didn't, we'd have the address space hole).
Acked-by: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Nick Piggin <npiggin@suse.de>
Cc: Hugh Dickins <hugh.dickins@tiscali.co.uk>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Merge branch 'irq-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

* 'irq-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  genirq, irq.h: Fix kernel-doc warnings
  genirq: fix comment to say IRQ_WAKE_THREAD

Merge branch 'perfcounters-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

* 'perfcounters-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (49 commits)
  perfcounter: Handle some IO return values
  perf_counter: Push perf_sample_data through the swcounter code
  perf_counter tools: Define and use our own u64, s64 etc. definitions
  perf_counter: Close race in perf_lock_task_context()
  perf_counter, x86: Improve interactions with fast-gup
  perf_counter: Simplify and fix task migration counting
  perf_counter tools: Add a data file header
  perf_counter: Update userspace callchain sampling uses
  perf_counter: Make callchain samples extensible
  perf report: Filter to parent set by default
  perf_counter tools: Handle lost events
  perf_counter: Add event overlow handling
  fs: Provide empty .set_page_dirty() aop for anon inodes
  perf_counter: tools: Makefile tweaks for 64-bit powerpc
  perf_counter: powerpc: Add processor back-end for MPC7450 family
  perf_counter: powerpc: Make powerpc perf_counter code safe for 32-bit kernels
  perf_counter: powerpc: Change how processor-specific back-ends get selected
  perf_counter: powerpc: Use unsigned long for register and constraint values
  perf_counter: powerpc: Enable use of software counters on 32-bit powerpc
  perf_counter tools: Add and use isprint()
  ...

Merge branch 'sched-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

* 'sched-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  sched: Fix out of scope variable access in sched_slice()
  sched: Hide runqueues from direct refer at source code level
  sched: Remove unneeded __ref tag
  sched, x86: Fix cpufreq + sched_clock() TSC scaling

Merge branch 'tracing-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

* 'tracing-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (24 commits)
  tracing/urgent: warn in case of ftrace_start_up inbalance
  tracing/urgent: fix unbalanced ftrace_start_up
  function-graph: add stack frame test
  function-graph: disable when both x86_32 and optimize for size are configured
  ring-buffer: have benchmark test print to trace buffer
  ring-buffer: do not grab locks in nmi
  ring-buffer: add locks around rb_per_cpu_empty
  ring-buffer: check for less than two in size allocation
  ring-buffer: remove useless compile check for buffer_page size
  ring-buffer: remove useless warn on check
  ring-buffer: use BUF_PAGE_HDR_SIZE in calculating index
  tracing: update sample event documentation
  tracing/filters: fix race between filter setting and module unload
  tracing/filters: free filter_string in destroy_preds()
  ring-buffer: use commit counters for commit pointer accounting
  ring-buffer: remove unused variable
  ring-buffer: have benchmark test handle discarded events
  ring-buffer: prevent adding write in discarded area
  tracing/filters: strloc should be unsigned short
  tracing/filters: operand can be negative
  ...

Fix up kmemcheck-induced conflict in kernel/trace/ring_buffer.c manually

Merge branch 'timers-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

* 'timers-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  NOHZ: Properly feed cpufreq ondemand governor

Merge branch 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

* 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (45 commits)
  x86, mce: fix error path in mce_create_device()
  x86: use zalloc_cpumask_var for mce_dev_initialized
  x86: fix duplicated sysfs attribute
  x86: de-assembler-ize asm/desc.h
  i386: fix/simplify espfix stack switching, move it into assembly
  i386: fix return to 16-bit stack from NMI handler
  x86, ioapic: Don't call disconnect_bsp_APIC if no APIC present
  x86: Remove duplicated #include's
  x86: msr.h linux/types.h is only required for __KERNEL__
  x86: nmi: Add Intel processor 0x6f4 to NMI perfctr1 workaround
  x86, mce: mce_intel.c needs <asm/apic.h>
  x86: apic/io_apic.c: dmar_msi_type should be static
  x86, io_apic.c: Work around compiler warning
  x86: mce: Don't touch THERMAL_APIC_VECTOR if no active APIC present
  x86: mce: Handle banks == 0 case in K7 quirk
  x86, boot: use .code16gcc instead of .code16
  x86: correct the conversion of EFI memory types
  x86: cap iomem_resource to addressable physical memory
  x86, mce: rename _64.c files which are no longer 64-bit-specific
  x86, mce: mce.h cleanup
  ...

Manually fix up trivial conflict in arch/x86/mm/fault.c

* 'for-linus' of git://git.monstr.eu/linux-2.6-microblaze:
  microblaze: Add missing symbols for CONSTRUCTORS support
  microblaze: remove init_mm

* git://git.kernel.org/pub/scm/linux/kernel/git/sam/kbuild-fixes:
  kernel-doc: fix param matching for array params
  kernel-doc: ignore kmemcheck_bitfield_begin/end
  kallsyms: fix inverted valid symbol checking
  kbuild: fix build error during make htmldocs

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input: (35 commits)
  Input: add driver for Synaptics I2C touchpad
  Input: synaptics - add support for reporting x/y resolution
  Input: ALPS - handle touchpoints buttons correctly
  Input: gpio-keys - change timer to workqueue
  Input: ads7846 - pin change interrupt support
  Input: add support for touchscreen on W90P910 ARM platform
  Input: appletouch - improve finger detection
  Input: wacom - clear Intuos4 wheel data when finger leaves proximity
  Input: ucb1400 - move static function from header into core
  Input: add driver for EETI touchpanels
  Input: ads7846 - more detailed model name in sysfs
  Input: ads7846 - support swapping x and y axes
  Input: ati_remote2 - use non-atomic bitops
  Input: introduce lm8323 keypad driver
  Input: psmouse - ESD workaround fix for OLPC XO touchpad
  Input: tsc2007 - make sure platform provides get_pendown_state()
  Input: uinput - flush all pending ff effects before destroying device
  Input: simplify name handling for certain input handles
  Input: serio - do not use deprecated dev.power.power_state
  Input: wacom - add support for Intuos4 tablets
  ...

* 'drm-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied/drm-2.6: (24 commits)
  agp/intel: Make intel_i965_mask_memory use dma_addr_t for physical addresses
  agp: add user mapping support to ATI AGP bridge.
  drm/i915: enable GEM on PAE.
  drm/radeon: fix unused variables warning
  agp: switch AGP to use page array instead of unsigned long array
  agpgart: detected ALi M???? chipset with M1621
  drm/radeon: command stream checker for r3xx-r5xx hardware
  drm/radeon: Fully initialize LVDS info also when we can't get it from the ROM.
  radeon: Fix CP byte order on big endian architectures with KMS.
  agp/uninorth: Handle user memory types.
  drm/ttm: Add some powerpc cache flush code.
  radeon: Enable modesetting on non-x86.
  drm/radeon: Respect AGP cant_use_aperture flag.
  drm: EDID endianness fixes.
  drm/radeon: this VRAM vs aperture test is wrong, just remove it.
  drm/ttm: fix an error path to exit function correctly
  drm: Apply "Memory fragmentation from lost alignment blocks"
  ttm: Return -ERESTART when a signal interrupts bo eviction.
  drm: Remove memory debugging infrastructure.
  drm/i915: Clear fence register on tiling stride change.
  ...

* git://git.kernel.org/pub/scm/linux/kernel/git/hirofumi/fatfs-2.6:
  fat: Fix the removal of opts->fs_dmask

* 'for-2.6.31' of git://git.kernel.org/pub/scm/linux/kernel/git/bart/ide-2.6: (34 commits)
  ide-cd: prevent null pointer deref via cdrom_newpc_intr
  ide: BUG() on unknown requests
  ide: filter out invalid DMA xfer mode changes in HDIO_DRIVE_CMD ioctl handler
  ide: do not access ide_drive_t 'drive_data' field directly
  sl82c105: implement test_irq() method
  siimage: implement test_irq() method
  pdc202xx_old: implement test_irq() method (take 2)
  cmd64x: implement test_irq() method
  cmd640: implement test_irq() method
  ide: move ack_intr() method into 'struct ide_port_ops' (take 2)
  ide: move IRQ clearing from ack_intr() method to clear_irq() method (take 2)
  siimage: use ide_dma_test_irq() (take 2)
  cmd64x: implement clear_irq() method (take 2)
  ide: call clear_irq() method in ide_timer_expiry()
  sgiioc4: coding style cleanup
  ide: don't enable IORDY at a probe time
  ide: IORDY handling fixes
  ata: add ata_id_pio_need_iordy() helper (v2)
  ide-tape: fix build issue
  ide: unify interrupt reason checking
  ...

It's really not right to use 'access_ok()', since that is meant for the
normal "get_user()" and "copy_from/to_user()" accesses, which are done
through the TLB, rather than through the page tables.

Why? access_ok() does both too few, and too many checks.  Too many,
because it is meant for regular kernel accesses that will not honor the
'user' bit in the page tables, and because it honors the USER_DS vs
KERNEL_DS distinction that we shouldn't care about in GUP.  And too few,
because it doesn't do the 'canonical' check on the address on x86-64,
since the TLB will do that for us.

So instead of using a function that isn't meant for this, and does
something else and much more complicated, just do the real rules: we
don't want the range to overflow, and on x86-64, we want it to be a
canonical low address (on 32-bit, all addresses are canonical).
Acked-by: Ingo Molnar <mingo@elte.hu>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Merge branch 'tip/tracing/urgent-1' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-2.6-trace into tracing/urgent