Commit Graph

130704 Commits

Author SHA1 Message Date
Bartlomiej Zolnierkiewicz
a77dcc437c ide: add CS5536 host driver (v3)
This is a port of libata's pata_cs5536.c (written by Martin K. Petersen)
to IDE subsystem.

Changes done while at it:

* Reprogram PIO/MWDMA timings if needed before and after DMA transfer
  (chipset uses shared PIO/MWDMA timings).

* Fix cable detection to report 80-wires cable if BIOS set it for any
  device on a port (IDE core will do drive-side cable detection later).

* Don't disable UDMA while programming PIO timings.

* Simplify PCI/MSR support.

Pros of having IDE host driver in addition to libata's one:

* IDE is much lighter than SCSI+libata, the host driver itself is also
  a bit smaller:

   text    data     bss     dec     hex filename
   1261     496       4    1761     6e1 drivers/ata/pata_cs5536.o
   1242     128       4    1374     55e drivers/ide/cs5536.o

* This allows use of IDE features which are unavailable under libata.

v2:
* Fixes per review from Sergei:
  - simplify dependency check in Kconfig
  - use IDE_DRV_MASK also for ->drive_data
  - disable UDMA when programming MWDMA
  - program new DTC timings only when necessary
  - fix printk() level in cs5536_init_one()

* Fix patch description according to comments from Alan and Sergei.

v3:
* Smarter masking of UDMA bits per Sergei's suggestion.

Cc: Martin K. Petersen <mkp@mkp.net>
Cc: Karl Auerbach <karl@iwl.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Acked-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
2009-02-02 20:12:23 +01:00
Gerhard Pircher
9f6514c1c5 ide: Force VIA IDE legacy interrupts for AmigaOne boards
The AmigaOne uses the onboard VIA IDE controller in legacy mode (like the
Pegasos).

Signed-off-by: Gerhard Pircher <gerhard_pircher@gmx.net>
Cc: "Grant Likely" <grant.likely@secretlab.ca>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
2009-02-02 20:12:22 +01:00
Ian Campbell
51d6ac7011 IDE: Unregister and disable devices if initialization fails.
On reboot the loop in device_shutdown gets confused by these partially
initialized devices and goes into an infinite loop. Therefore unregister
and disable these devices.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
[bart: remove leftover hwif->present clearing + update patch description]
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
2009-02-02 20:12:22 +01:00
Bartlomiej Zolnierkiewicz
9a100f4b78 ide: fix ide_register_port() failure handling
* Factor out port freeing from ide_host_free() to ide_free_port().

* Add ide_disable_port() and use it on ide_register_port() failure.

Cc: Ian Campbell <Ian.Campbell@citrix.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
2009-02-02 20:12:21 +01:00
Kay Sievers
e5461f38b4 ide: struct device - replace bus_id with dev_name(), dev_set_name()
Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>
Cc: linux-ide@vger.kernel.org
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
2009-02-02 20:12:21 +01:00
Borislav Petkov
9e772d0135 ide-cd: fix DMA for non bio-backed requests
This one fixes http://bugzilla.kernel.org/show_bug.cgi?id=12320.

Signed-off-by: Borislav Petkov <petkovbb@gmail.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
2009-02-02 20:12:21 +01:00
Linus Torvalds
27421e211a Manually revert "mlock: downgrade mmap sem while populating mlocked regions"
This essentially reverts commit 8edb08caf6.

It downgraded our mmap semaphore to a read-lock while mlocking pages, in
order to allow other threads (and external accesses like "ps" et al) to
walk the vma lists and take page faults etc.  Which is a nice idea, but
the implementation does not work.

Because we cannot upgrade the lock back to a write lock without
releasing the mmap semaphore, the code had to release the lock entirely
and then re-take it as a writelock.  However, that meant that the caller
possibly lost the vma chain that it was following, since now another
thread could come in and mmap/munmap the range.

The code tried to work around that by just looking up the vma again and
erroring out if that happened, but quite frankly, that was just a buggy
hack that doesn't actually protect against anything (the other thread
could just have replaced the vma with another one instead of totally
unmapping it).

The only way to downgrade to a read map _reliably_ is to do it at the
end, which is likely the right thing to do: do all the 'vma' operations
with the write-lock held, then downgrade to a read after completing them
all, and then do the "populate the newly mlocked regions" while holding
just the read lock.  And then just drop the read-lock and return to user
space.

The (perhaps somewhat simpler) alternative is to just make all the
callers of mlock_vma_pages_range() know that the mmap lock got dropped,
and just re-grab the mmap semaphore if it needs to mlock more than one
vma region.

So we can do this "downgrade mmap sem while populating mlocked regions"
thing right, but the way it was done here was absolutely not correct.
Thus the revert, in the expectation that we will do it all correctly
some day.

Cc: Lee Schermerhorn <lee.schermerhorn@hp.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: stable@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-02-01 11:00:16 -08:00
Linus Torvalds
45c82b5a77 Merge branch 'header-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
* 'header-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (90 commits)
  headers_check fix: x86, swab.h
  headers_check fix: x86, sigcontext32.h
  headers_check fix: x86, sigcontext.h
  headers_check fix: x86, ptrace-abi.h
  headers_check fix: x86, mtrr.h
  headers_check fix: x86, mce.h
  headers_check fix: x86, kvm.h
  headers_check fix: x86, e820.h
  headers_check fix: linux/rtnetlink.h
  headers_check fix: linux/nubus.h
  headers_check fix: video/uvesafb.h
  headers_check fix: video/sisfb.h
  headers_check fix: sound/hdsp.h
  headers_check fix: mtd/inftl-user.h
  headers_check fix: linux/virtio_net.h
  headers_check fix: linux/virtio_console.h
  headers_check fix: linux/virtio_blk.h
  headers_check fix: linux/videodev.h
  headers_check fix: linux/video_encoder.h
  headers_check fix: linux/video_decoder.h
  ...
2009-01-31 15:56:23 -08:00
Linus Torvalds
1347e965f5 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:
  generic-ipi: use per cpu data for single cpu ipi calls
  cpumask: convert lib/smp_processor_id to new cpumask ops
  signals, debug: fix BUG: using smp_processor_id() in preemptible code in print_fatal_signal()
2009-01-31 15:55:05 -08:00
Linus Torvalds
ac56b94f80 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:
  irq: export __set_irq_handler() and handle_level_irq()
2009-01-31 15:54:30 -08:00
Linus Torvalds
5b2d3e6d54 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:
  hrtimer: prevent negative expiry value after clock_was_set()
  hrtimers: allow the hot-unplugging of all cpus
  hrtimers: increase clock min delta threshold while interrupt hanging
2009-01-31 15:54:06 -08:00
Linus Torvalds
f6490438fc 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:
  x86, ds, bts: cleanup/fix DS configuration
  ring-buffer: reset timestamps when ring buffer is reset
  trace: set max latency variable to zero on default
  trace: stop all recording to ring buffer on ftrace_dump
  trace: print ftrace_dump at KERN_EMERG log level
  ring_buffer: reset write when reserve buffer fail
  tracing/function-graph-tracer: fix a regression while suspend to disk
  ring-buffer: fix alignment problem
2009-01-31 15:53:30 -08:00
Linus Torvalds
e81cfd214f 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:
  x86 setup: fix asm constraints in vesa_store_edid
  xen: make sysfs files behave as their names suggest
  x86: tone down mtrr_trim_uncached_memory() warning
  x86: correct the CPUID pattern for MSR_IA32_MISC_ENABLE availability
2009-01-31 15:52:46 -08:00
Linus Torvalds
4b8d8ab566 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/lrg/voltage-2.6
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/lrg/voltage-2.6:
  leds: Fix bounds checking of wm8350->pmic.led
  regulator: move bq24022 init back to module_init instead of subsys_initcall
2009-01-31 15:52:25 -08:00
Linus Torvalds
c5e18af910 Merge branch 'upstream' of git://ftp.linux-mips.org/pub/scm/upstream-linus
* 'upstream' of git://ftp.linux-mips.org/pub/scm/upstream-linus: (27 commits)
  MIPS: Alchemy: time.c build fix
  MIPS: RB532: Export rb532_gpio_set_func()
  MIPS: RB532: Update headers
  MIPS: RB532: Simplify dev3 init
  MIPS: RB532: Remove {get,set}_434_reg()
  MIPS: RB532: Move dev3 init code to devices.c
  MIPS: RB532: Fix set_latch_u5()
  MIPS: RB532: Fix init of rb532_dev3_ctl_res
  MIPS: RB532: Use driver_data instead of platform_data
  MIPS: RB532: Detect uart type, add platform device
  MIPS: RB532: remove useless CF GPIO initialisation
  MIPS: RB532: Auto disable GPIO alternate function
  MIPS: RB532: Add set_type() function to IRQ struct.
  MIPS: RC32434: Define io_map_base for PCI controller
  MIPS: RB532: Fix bit swapping in rb532_set_bit()
  MIPS: Use hardware watchpoints on all R1 and R2 CPUs.
  MIPS: Read watch registers with interrupts disabled.
  MIPS: Fix a typo in watchpoint register structure.
  MIPS: TXx9: Add support for TX4939 internal RTC
  MIPS: R2: Fix broken installation of cache error handler.
  ...
2009-01-31 15:52:02 -08:00
Mikulas Patocka
878b8619f7 Fix memory corruption in console selection
Fix an off-by-two memory error in console selection.

The loop below goes from sel_start to sel_end (inclusive), so it writes
one more character.  This one more character was added to the allocated
size (+1), but it was not multiplied by an UTF-8 multiplier.

This patch fixes a memory corruption when UTF-8 console is used and the
user selects a few characters, all of them 3-byte in UTF-8 (for example
a frame line).

When memory redzones are enabled, a redzone corruption is reported.
When they are not enabled, trashing of random memory occurs.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-01-31 15:51:31 -08:00
Linus Torvalds
f984d02419 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6:
  igb: fix link reporting when using sgmii
  igb: prevent skb_over panic w/ mtu smaller than 1K
  igb: Fix DCA errors and do not use context index for 82576
  ipv6: compile fix for ip6mr.c
  packet: Avoid lock_sock in mmap handler
  sfc: Replace stats_enabled flag with a disable count
  sfc: SFX7101/SFT9001: Fix AN advertisements
  sfc: SFT9001: Always enable XNP exchange on SFT9001 rev B
  sfc: Update board info for hardware monitor on SFN4111T-R5 and later
  sfc: Test for PHYXS faults whenever we cannot test link state bits
  sfc: Reinitialise the PHY completely in case of a PHY or NIC reset
  sfc: Fix post-reset MAC selection
  sfc: SFN4111T: Fix GPIO sharing between I2C and FLASH_CFG_1
  sfc: SFT9001: Fix speed reporting in 1G PHY loopback
  sfc: SFX7101: Remove workaround for bad link training
  sfc: SFT9001: Enable robust link training
  sky2: fix hard hang with netconsoling and iface going up
2009-01-31 15:50:43 -08:00
Linus Torvalds
fc8744adc8 Stop playing silly games with the VM_ACCOUNT flag
The mmap_region() code would temporarily set the VM_ACCOUNT flag for
anonymous shared mappings just to inform shmem_zero_setup() that it
should enable accounting for the resulting shm object.  It would then
clear the flag after calling ->mmap (for the /dev/zero case) or doing
shmem_zero_setup() (for the MAP_ANON case).

This just resulted in vma merge issues, but also made for just
unnecessary confusion.  Use the already-existing VM_NORESERVE flag for
this instead, and let shmem_{zero|file}_setup() just figure it out from
that.

This also happens to make it obvious that the new DRI2 GEM layer uses a
non-reserving backing store for its object allocation - which is quite
possibly not intentional.  But since I didn't want to change semantics
in this patch, I left it alone, and just updated the caller to use the
new flag semantics.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-01-31 15:08:56 -08:00
Alexander Duyck
5d0932a5dd igb: fix link reporting when using sgmii
When using sgmii the link was not being properly passed up to the driver
from the underlying link management functions.  This change corrects it so
that get_link_status is cleared when a link has been found.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-01-31 00:53:18 -08:00
Alexander Duyck
ec54d7d6e4 igb: prevent skb_over panic w/ mtu smaller than 1K
A panic has been observed with frame sizes smaller than 1K.  This has been
root caused to the hardware spanning larger frames across multiple buffers
and then reporting the original frame size in the first descriptor.  To
prevent this we can enable set the LPE bit which in turn will restrict
packet sizes to those set in the RLPML register.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-01-31 00:52:57 -08:00
Alexander Duyck
bbd98fe48a igb: Fix DCA errors and do not use context index for 82576
82576 was being incorrectly flagged as needing a context index.  It does not as
each ring has it's own table of 2 contexts.

Driver was registering after registering the driver instead of the other way around.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-01-31 00:52:30 -08:00
Dave Jones
5d6e430d3b ipv6: compile fix for ip6mr.c
net/ipv6/ip6mr.c: In function 'pim6_rcv':
net/ipv6/ip6mr.c:368: error: implicit declaration of function 'csum_ipv6_magic'

Signed-off-by: Dave Jones <davej@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-01-31 00:51:49 -08:00
Andreas Schwab
7fc49f1981 x86 setup: fix asm constraints in vesa_store_edid
Impact: fix potential miscompile (currently believed non-manifest)

As the comment explains, the VBE DDC call can clobber any register.
Tell the compiler about that fact.

Signed-off-by: Andreas Schwab <schwab@suse.de>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-01-30 23:55:25 +01:00
Herbert Xu
905db44087 packet: Avoid lock_sock in mmap handler
As the mmap handler gets called under mmap_sem, and we may grab
mmap_sem elsewhere under the socket lock to access user data, we
should avoid grabbing the socket lock in the mmap handler.

Since the only thing we care about in the mmap handler is for
pg_vec* to be invariant, i.e., to exclude packet_set_ring, we
can achieve this by simply using a new mutex.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Tested-by: Martin MOKREJŠ <mmokrejs@ribosome.natur.cuni.cz>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-01-30 14:13:49 -08:00
Ben Hutchings
1974cc205e sfc: Replace stats_enabled flag with a disable count
Currently we use a spin-lock to serialise statistics fetches and also
to inhibit them for short periods of time, plus a flag to
enable/disable statistics fetches for longer periods of time, during
online reset.  This was apparently insufficient to deal with the several
reasons for stats being disabled.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-01-30 14:06:33 -08:00
Ben Hutchings
af4ad9bca0 sfc: SFX7101/SFT9001: Fix AN advertisements
All 10Xpress PHYs require autonegotiation all the time; enforce this
in the set_settings() method and do not treat it as a workaround.

Remove claimed support for 100M HD mode since it is not supported by
current firmware.

Do not set speed override bits when AN is enabled, and do not use
register 1.49192 for AN configuration as it can override what we set
elsewhere.

Always set the AN selector bits to 1 (802.3).

Fix confusion between Next Page and Extended Next Page.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-01-30 14:06:32 -08:00
Ben Hutchings
c9d5a53f06 sfc: SFT9001: Always enable XNP exchange on SFT9001 rev B
This workaround is not specific to rev A.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-01-30 14:06:32 -08:00
Ben Hutchings
44176b45d1 sfc: Update board info for hardware monitor on SFN4111T-R5 and later
Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-01-30 14:06:31 -08:00
Steve Hodgson
67797763c6 sfc: Test for PHYXS faults whenever we cannot test link state bits
Depending on the loopback mode, there may be no pertinent link state
bits.  In this case we test the PHYXS RX fault bit instead.  Make
sure to do this in all cases where there are no link state bits.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-01-30 14:06:31 -08:00
Steve Hodgson
4b988280be sfc: Reinitialise the PHY completely in case of a PHY or NIC reset
In particular, set pause advertising bits properly.

A PHY reset is not necessary to recover from the register self-test,
so use a "invisible" reset there instead.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-01-30 14:06:30 -08:00
Steve Hodgson
0cc1283879 sfc: Fix post-reset MAC selection
Modify falcon_switch_mac() to always set NIC_STAT_REG, even if the the
MAC is the same as it was before.  This ensures that the value is
correct after an online reset.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-01-30 14:06:30 -08:00
Ben Hutchings
2f08575389 sfc: SFN4111T: Fix GPIO sharing between I2C and FLASH_CFG_1
Change sfn4111t_reset() to change only GPIO output enables so that it
doesn't break subsequent I2C operations.

Update comments to explain exactly what we're doing.

Add a short sleep to make sure the FLASH_CFG_1 value is latched before
any subsequent I2C operations.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-01-30 14:06:29 -08:00
Steve Hodgson
8b9dc8dd44 sfc: SFT9001: Fix speed reporting in 1G PHY loopback
Instead of disabling AN in loopback, just prevent restarting AN and
override the speed in sft9001_get_settings().

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-01-30 14:06:29 -08:00
Steve Hodgson
2d18835d65 sfc: SFX7101: Remove workaround for bad link training
Early versions of the SFX7101 firmware could complete link training in
a state where it would not adequately cancel noise (Solarflare bug
10750).  We previously worked around this by resetting the PHY after
seeing many Ethernet CRC errors.  This workaround is unsafe since it
takes no account of the interval between errors; it also appears to
be unnecessary with production firmware.  Therefore remove it.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-01-30 14:06:27 -08:00
Steve Hodgson
869b5b3888 sfc: SFT9001: Enable robust link training
Enable a firmware option that appears to be necessary for reliable
operation.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-01-30 14:06:27 -08:00
Alexey Dobriyan
a11da890e4 sky2: fix hard hang with netconsoling and iface going up
Printing anything over netconsole before hw is up and running is,
of course, not going to work.

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Acked-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-01-30 14:06:26 -08:00
Roel Kluin
8dd2c9e312 leds: Fix bounds checking of wm8350->pmic.led
Fix bounds checking of wm8350->pmic.led

Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>
2009-01-30 21:50:49 +00:00
Philipp Zabel
9bf503e6be regulator: move bq24022 init back to module_init instead of subsys_initcall
This workaround was needed when regulator/ was not linked before both
power/ and usb/otg/ in drivers/Makefile. Now that it is even linked
before mfd/, this patch makes sure that bq24022 isn't probed before the
GPIO expander is set up.

Signed-off-by: Philipp Zabel <philipp.zabel@gmail.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>
2009-01-30 21:50:49 +00:00
Thomas Gleixner
b0a9b5111a hrtimer: prevent negative expiry value after clock_was_set()
Impact: prevent false positive WARN_ON() in clockevents_program_event()

clock_was_set() changes the base->offset of CLOCK_REALTIME and
enforces the reprogramming of the clockevent device to expire timers
which are based on CLOCK_REALTIME. If the clock change is large enough
then the subtraction of the timer expiry value and base->offset can
become negative which triggers the warning in
clockevents_program_event().

Check the subtraction result and set a negative value to 0.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2009-01-30 22:35:34 +01:00
Sebastien Dugue
94df7de028 hrtimers: allow the hot-unplugging of all cpus
Impact: fix CPU hotplug hang on Power6 testbox

On architectures that support offlining all cpus (at least powerpc/pseries),
hot-unpluging the tick_do_timer_cpu can result in a system hang.

This comes from the fact that if the cpu going down happens to be the
cpu doing the tick, then as the tick_do_timer_cpu handover happens after the
cpu is dead (via the CPU_DEAD notification), we're left without ticks,
jiffies are frozen and any task relying on timers (msleep, ...) is stuck.
That's particularly the case for the cpu looping in __cpu_die() waiting
for the dying cpu to be dead.

This patch addresses this by having the tick_do_timer_cpu handover happen
earlier during the CPU_DYING notification. For this, a new clockevent
notification type is introduced (CLOCK_EVT_NOTIFY_CPU_DYING) which is triggered
in hrtimer_cpu_notify().

Signed-off-by: Sebastien Dugue <sebastien.dugue@bull.net>
Cc: <stable@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-01-30 22:35:29 +01:00
Frederic Weisbecker
7f22391cbe hrtimers: increase clock min delta threshold while interrupt hanging
Impact: avoid timer IRQ hanging slow systems

While using the function graph tracer on a virtualized system, the
hrtimer_interrupt can hang the system on an infinite loop.

This can be caused in several situations:

 - the hardware is very slow and HZ is set too high

 - something intrusive is slowing the system down (tracing under emulation)

... and the next clock events to program are always before the current time.

This patch implements a reasonable compromise: if such a situation is
detected, we share the CPUs time in 1/4 to process the hrtimer interrupts.
This is enough to let the system running without serious starvation.

It has been successfully tested under VirtualBox with 1000 HZ and 100 HZ
with function graph tracer launched. On both cases, the clock events were
increased until about 25 ms periodic ticks, which means 40 HZ.

So we change a hard to debug hang into a warning message and a system that
still manages to limp along.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-01-30 22:35:10 +01:00
Manuel Lauss
2d2eca4d11 MIPS: Alchemy: time.c build fix
In Linus' current -git the cpumask member is now a pointer.

Signed-off-by: Manuel Lauss <mano@roarinelk.homelinux.net>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2009-01-30 21:33:01 +00:00
Phil Sutter
0fc6bc0d6e MIPS: RB532: Export rb532_gpio_set_func()
This kernel symbol provides a way for drivers to switch on alternate
function for a certain GPIO pin. Turning it off is done implicitly when
changing the GPIO direction, as that would be fixed when using the given
pin als alternate function.

Signed-off-by: Phil Sutter <n0-1@freewrt.org>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2009-01-30 21:33:01 +00:00
Phil Sutter
3828ee047d MIPS: RB532: Update headers
Remove the {set,get}_434_reg() prototypes, as the functions have been
removed. Also move the prototypes for {get,set}_latch_u5() to the correct
place.

Signed-off-by: Phil Sutter <n0-1@freewrt.org>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2009-01-30 21:33:01 +00:00
Phil Sutter
1c4db8e828 MIPS: RB532: Simplify dev3 init
As rb532_dev3_ctl_res is not used by any platform device, it can be dropped
when not used for holding the physical address of the device 3 controller.

Also a size of one byte should suffice when ioremapping the physical
address mentioned above, as only a single byte is being read from and
written to it.

Signed-off-by: Phil Sutter <n0-1@freewrt.org>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2009-01-30 21:33:01 +00:00
Phil Sutter
4ca3803f81 MIPS: RB532: Remove {get,set}_434_reg()
These kernel symbols are unused. Also, since dev3 init has been moved to
devices.c, set_434_reg() breaks compiling as it uses dev3.

Signed-off-by: Phil Sutter <n0-1@freewrt.org>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2009-01-30 21:33:00 +00:00
Phil Sutter
36f2db4b9c MIPS: RB532: Move dev3 init code to devices.c
This code doesn't belong to gpio.c, as it's completely unrelated to
GPIO. As dev1 and dev2 init code is in devices.c, it seems to be a more
adequate place.

Signed-off-by: Phil Sutter <n0-1@freewrt.org>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2009-01-30 21:33:00 +00:00
Phil Sutter
7060886fb7 MIPS: RB532: Fix set_latch_u5()
The data to be written is just a byte, so use writeb instead of writel.
Also, dev3.base contains the address, not the data so referencing here
is wrong.

Signed-off-by: Phil Sutter <n0-1@freewrt.org>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2009-01-30 21:33:00 +00:00
Phil Sutter
deb1003329 MIPS: RB532: Fix init of rb532_dev3_ctl_res
This register just contains the address of the actual resource, so
initialisation has to be the same as cf_slot0_res and nand_slot0_res.

Signed-off-by: Phil Sutter <n0-1@freewrt.org>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2009-01-30 21:33:00 +00:00
Phil Sutter
94d2cc1b8b MIPS: RB532: Use driver_data instead of platform_data
As the korina ethernet driver uses platform_get_drvdata() to extract the
driver specific data from the platform device, driver_data has to be
used here.

Signed-off-by: Phil Sutter <n0-1@freewrt.org>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2009-01-30 21:33:00 +00:00