A soft lockup existed in the handling of ack vector records.
Specifically, when a tail of the list of ack vector records was
removed, it was possible to end up iterating infinitely on an element
of the tail.
Signed-off-by: Andrea Bittau <a.bittau@cs.ucl.ac.uk>
Signed-off-by: Ian McDonald <ian.mcdonald@jandi.co.nz>
Signed-off-by: David S. Miller <davem@davemloft.net>
People have been reporting that PPP connections over ptys, such as
used with PPTP, will hang randomly when transferring large amounts of
data, for instance in http://bugzilla.kernel.org/show_bug.cgi?id=6530.
I have managed to reproduce the problem, and the patch below fixes the
actual cause.
The problem is not in fact in ppp_async.c but in n_tty.c. What
happens is that when pptp reads from the pty, we call read_chan() in
drivers/char/n_tty.c on the master side of the pty. That copies all
the characters out of its buffer to userspace and then calls
check_unthrottle(), which calls the pty unthrottle routine, which
calls tty_wakeup on the slave side, which calls ppp_asynctty_wakeup,
which calls tasklet_schedule. So far so good. Since we are in
process context, the tasklet runs immediately and calls
ppp_async_process(), which calls ppp_async_push, which calls the
tty->driver->write function to send some more output.
However, tty->driver->write() returns zero, because the master
tty->receive_room is still zero. We haven't returned from
check_unthrottle() yet, and read_chan() only updates tty->receive_room
_after_ calling check_unthrottle. That means that the driver->write
call in ppp_async_process() returns 0. That would be fine if we were
going to get a subsequent wakeup call, but we aren't (we just had it,
and the buffer is now empty).
The solution is for n_tty.c to update tty->receive_room _before_
calling the driver unthrottle routine. The patch below does this.
With this patch I was able to transfer a 900MB file over a PPTP
connection (taking about 25 minutes), whereas without the patch the
connection would always stall in under a minute.
Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Bug fix: mv_eng_timeout() calls mv_err_intr() without first grabbing the host lock,
which can lead to all sorts of interesting scenarios.
This whole error-handling portion of sata_mv is nasty (and will get fixed for
the new EH stuff), but for now this patch will help keep it on life-support.
Signed-off-by: Mark Lord <liml@rtr.ca>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
From: Christoph Lameter <clameter@sgi.com>
Looks like a comma was left from the conversion from a struct to an
assignment.
Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
According to Intel ICH spec, there are several rules that Base Address
should be programmed before IOSE (PCICMD register ) enabled.
For example ICH7:
12.1.3 SATA : the base address register for the bus master register
should be programmed before this bit is set.
11.1.3: PCICMD (USB): The base address register for USB should be
programmed before this bit is set.
....
To make sure kernel code follow this rule , and prevent unnecessary
confusion. I proposal this patch.
Signed-off-by: Luming Yu <luming.yu@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
At least one laptop blew up on resume from suspend with a black screen due
to a lack of this patch. By only writing back config space that is
different, we minimise the possibility of accidents like this.
Signed-off-by: Dave Jones <davej@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
We currently don't handle errors properly when resuming a PCI device:
* In pci_default_resume() we capture the error code returned by
pci_enable_device() but don't pass it up to the caller.
Introduced by commit 95a629657d
* In pci_resume_device(), the errors possibly returned by the driver's
.resume method or by the generic pci_default_resume() function are
ignored.
This patch fixes both issues.
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Fix build error when CONFIG_ACPI not defined
Signed-off-by: Kristen Carlson Accardi <kristen.c.accardi@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This patch sets the max_cache_size value required to tune up
scheduler in SMP systems. Otherwise, the calculated
migration_cost is too high and task scheduling may lock up.
Signed-off-by: Krzysztof Helt <krzysztof.h1@wp.pl>
Signed-off-by: David S. Miller <davem@davemloft.net>
* master.kernel.org:/pub/scm/linux/kernel/git/davem/sparc-2.6:
[SPARC64]: Avoid JBUS errors on some Niagara systems.
[FUSION]: Fix mptspi.c build with CONFIG_PM not set.
[TG3]: Handle Sun onboard tg3 chips more correctly.
[SPARC64]: Dump local cpu registers in sun4v_log_error()
From: Milton Miller <miltonm@bga.com>
The add_preferred_console call in rtas_console.c was not causing the
console to be selected. It turns out that the add_preferred_console was
being called after the hvc_console driver was registered. It only works
when it is called before the console driver is registered.
Reorder hvc_console.o after the hvc_console drivers to allow the selection
during console_initcall processing.
Signed-off-by: Milton Miller <miltonm@bga.com>
Signed-off-by: Anton Blanchard <anton@samba.org>
Cc: Paul Mackerras <paulus@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
From: Markus Lidel <Markus.Lidel@shadowconnect.com>
- Fixed locking of struct i2o_exec_wait in Executive-OSM
- Removed LCT Notify in i2o_exec_probe() which caused freeing memory and
accessing freed memory during first enumeration of I2O devices
- Added missing locking in i2o_exec_lct_notify()
- removed put_device() of I2O controller in i2o_iop_remove() which caused
the controller structure get freed to early
- Fixed size of mempool in i2o_iop_alloc()
- Fixed access to freed memory in i2o_msg_get()
See http://bugzilla.kernel.org/show_bug.cgi?id=6561
Signed-off-by: Markus Lidel <Markus.Lidel@shadowconnect.com>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
From: Andrew Morton <akpm@osdl.org>
Work around the oops reported in
http://bugzilla.kernel.org/show_bug.cgi?id=6478.
Thanks to Ralf Hildebrandt <ralf.hildebrandt@charite.de> for testing and
reporting.
Acked-by: Dave Jones <davej@codemonkey.org.uk>
Cc: "Brown, Len" <len.brown@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
From: David Howells <dhowells@redhat.com>
Apply some alterations to the memory barrier document that I worked out
with Paul McKenney of IBM, plus some of the alterations suggested by Alan
Stern.
The following changes were made:
(*) One of the examples given for what can happen with overlapping memory
barriers was wrong.
(*) The description of general memory barriers said that a general barrier is
a combination of a read barrier and a write barrier. This isn't entirely
true: it implies both, but is more than a combination of both.
(*) The first example in the "SMP Barrier Pairing" section was wrong: the
loads around the read barrier need to touch the memory locations in the
opposite order to the stores around the write barrier.
(*) Added a note to make explicit that the loads should be in reverse order to
the stores.
(*) Adjusted the diagrams in the "Examples Of Memory Barrier Sequences"
section to make them clearer. Added a couple of diagrams to make it more
clear as to how it could go wrong without the barrier.
(*) Added a section on memory speculation.
(*) Dropped any references to memory allocation routines doing memory
barriers. They may do sometimes, but it can't be relied on. This may be
worthy of further documentation later.
(*) Made the fact that a LOCK followed by an UNLOCK should not be considered a
full memory barrier more explicit and gave an example.
Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Paul E. McKenney <paulmck@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Both Integrator and Versatile were using set_irq_handler() and
enable_irq(), and working around the initialisation of the
chained interrupt, instead of the more correct
set_irq_chained_handler() function. Fix Integrator and
Versatile to use the right function, and remove these work-arounds.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Doing PCI config space accesses to non-present PCI slots
can result in fatal JBUS errors if the PCI config access
hypervisor call is performed on cpus other than the boot
cpu.
PCI config space accesses to present PCI slots works just
fine.
Recursively traverse the OBP device tree under the PCI
controller node and record all present device IDs into
a small hash table.
Avoid the hypervisor call for any PCI config space access
attempt for a device not recorded in the hash table.
Signed-off-by: David S. Miller <davem@davemloft.net>
Get rid of all the SUN_570X logic and instead:
1) Make sure MEMARB_ENABLE is set when we probe the SRAM
for config information. If that is off we will get
timeouts.
2) Always try to sync with the firmware, if there is no
firmware running do not treat it as an error and instead
just report it the first time we notice this condition.
3) If there is no valid SRAM signature, assume the device
is onboard by setting TG3_FLAG_EEPROM_WRITE_PROT.
Update driver version and release date.
With help from Michael Chan and Fabio Massimo Di Nitto.
Signed-off-by: David S. Miller <davem@davemloft.net>
The IBM Cell blade firmware might confuse the kernel to think it's a
pSeries machine. This fixes it for now. With a bit of luck, the firmware
will be updated to avoid that in the future but currently that patch is
needed.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
The code in prom_init.c calling the firmware
ibm,client-architecture-support method on pSeries has a bug where it
fails to properly pass the instance handle of the firmware object when
trying to call a method. Result ranges from the call doing nothing to
the firmware crashing. (Found by Segher, thanks !)
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Segher Boessenkool <segher@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This fixes a bug found by Dave Jones that means that it is possible
for userspace to provoke a machine check on 32-bit kernels. This
also fixes a couple of other places where I found similar problems
by inspection.
Signed-off-by: Paul Mackerras <paulus@samba.org>
From: Martin Schwidefsky <schwidefsky@de.ibm.com>
__futex_atomic_op needs to do an atomic operation in the user address space,
not the kernel address space. Add the missing sacf 256/sacf 0 to switch to
the secondary mode before doing the compare-and-swap. In addition add
another fixup for catch specification exceptions if the compare-and-swap
address is not aligned.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Looking at the reiser4 crash, I found a leak in debugfs. In
debugfs_mknod(), we create the inode before checking if the dentry
already has one attached. We don't free it if that is the case.
These bugs happen quite often, I'm starting to think we should disallow
such coding in CodingStyle.
Signed-off-by: Jens Axboe <axboe@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
There's a race between shutting down one io scheduler and firing up the
next, in which a new io could enter and cause the io scheduler to be
invoked with bad or NULL data.
To fix this, we need to maintain the queue lock for a bit longer.
Unfortunately we cannot do that, since the elevator init requires to be
run without the lock held. This isn't easily fixable, without also
changing the mempool API. So split the initialization into two parts,
and alloc-init operation and an attach operation. Then we can
preallocate the io scheduler and related structures, and run the attach
inside the lock after we detach the old one.
This patch has survived 30 minutes of 1 second io scheduler switching
with a very busy io load.
Signed-off-by: Jens Axboe <axboe@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
From: Malcom Parsons <malcolm.parsons@gmail.com>
When scrolling up in SCROLL_PAN_REDRAW mode with a large limited scroll
region, the bottom few lines have to be redrawn. Without this patch, the
wrong text is drawn into these lines, corrupting the display.
Observed in 2.6.14 when running an IRC client in the Nintendo DS linux
port.
I haven't tested if scrolling down has the same problem.
Signed-off-by: Antonino Daplas <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
From: Ralf Baechle <ralf@linux-mips.org>
<linux/mempolicy.h> uses struct mm_struct and relies on a definition or
declaration somehow magically being dragged in which may result in a
build:
[...]
CC mm/mempolicy.o
In file included from mm/mempolicy.c:69:
include/linux/mempolicy.h:150: warning: âstruct mm_structâ declared inside parameter list
include/linux/mempolicy.h:150: warning: its scope is only this definition or declaration, which is probably not what you want
include/linux/mempolicy.h:175: warning: âstruct mm_structâ declared inside parameter list
mm/mempolicy.c:622: error: conflicting types for âdo_migrate_pagesâ
include/linux/mempolicy.h:175: error: previous declaration of âdo_migrate_pagesâ was here
mm/mempolicy.c:1661: error: conflicting types for âmpol_rebind_mmâ
include/linux/mempolicy.h:150: error: previous declaration of âmpol_rebind_mmâ was here
make[1]: *** [mm/mempolicy.o] Error 1
make: *** [mm] Error 2
[ralf@denk linux-ip35]$
Including <linux/sched.h> is a step into direction of include hell so
fixed by adding a forward declaration of struct mm_struct instead.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
From: Lennert Buytenhek <buytenh@wantstofly.org>
The recent renaming of m48t86's ->readb() and ->writeb() platform driver
methods (2d7b20c188) to ->readbyte() and
->writebyte() to fix the ia64 build broke the build of the cirrus ep93xx
ARM platform. This patch fixes it up.
Signed-off-by: Lennert Buytenhek <buytenh@wantstofly.org>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
From: "Andy Currid" <ACurrid@nvidia.com>
This patch fixes a kernel panic during boot that occurs on NVIDIA platforms
that have HPET enabled.
When HPET is enabled, the standard timer IRQ is routed to IOAPIC pin 2 and is
advertised as such in the ACPI APIC table - but an earlier workaround in the
kernel was ignoring this override. The fix is to honor timer IRQ overrides
from ACPI when HPET is detected on an NVIDIA platform.
Signed-off-by: Andy Currid <acurrid@nvidia.com>
Cc: "Brown, Len" <len.brown@intel.com>
Cc: "Yu, Luming" <luming.yu@intel.com>
Cc: Andi Kleen <ak@muc.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
From: "Andy Currid" <ACurrid@nvidia.com>
This patch fixes a kernel panic during boot that occurs on NVIDIA platforms
that have HPET enabled.
When HPET is enabled, the standard timer IRQ is routed to IOAPIC pin 2 and is
advertised as such in the ACPI APIC table - but an earlier workaround in the
kernel was ignoring this override. The fix is to honor timer IRQ overrides
from ACPI when HPET is detected on an NVIDIA platform.
Signed-off-by: Andy Currid <acurrid@nvidia.com>
Cc: "Brown, Len" <len.brown@intel.com>
Cc: "Yu, Luming" <luming.yu@intel.com>
Cc: Andi Kleen <ak@muc.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Patch from Matt Reimer
There is a subtle bug in the GPIO interrupt status register
handling in arch/arm/mach-imx/irq.c:imx_gpio_ack_irq(). The
documentation states that a 1 should be written to the relevant bit to
acknowledge a GPIO interrupt, but that is not what the code does.
The problem is that the |= writes back 1s for all the *other*
interrupts represented in the register, so interrupts could get lost.
For example, if interrupts are pending for GPIO B10 and B12, ISR_B
would have the value 0x00001400. Then when the interrupt code handles
GPIO B10, it eventually calls imx_gpio_ack_irq(IRQ_GPIOB(10)), which
effectively does this:
ISR_B |= 1 << 10;
with the result that (0x00001400 | 0x00000400) is written, clearing
the interrupt status bits for *both* GPIO B10 and B12.
The fix is to write 1s only for the interrupts we want to clear.
The same problem seems to be occurring in the DMA code; this patch
does not address those issues.
Acked-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Matt Reimer <mreimer@vpop.net>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Patch from Richard Purdie
Add a power budget variable to the PXA OHCI platform data and add a
default value for the spitz platform(s) which prevents known failures
with certain USB devices.
Signed-off-by: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
While testing the genirq code on ARM, a condition was found whereby
the Neponset IRQ handler was being re-entered, causing the system
to deadlock.
Under the ARM IRQ code, this would not have been a visible problem
because the "simple" IRQ handling had no re-entrancy protection.
Resolve this by acknowledging the parent interrupt after we mask it
when we are going to handle one of our "special" level-based sources
(from ethernet or USAR chip.)
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
It was brought to our attention that the prefetches break e1000 traffic
on xscale/arm architectures. Remove them for now. We'll let them
stay in mm for a while, or find a better solution to enable.
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: Auke Kok <auke-jan.h.kok@intel.com>
New code added in 2.6.17 caused setup_irq to print a warning when
running ethtool -t eth0 offline.
This test marks the request_irq call made by this test as a "probe"
to see if the interrupt is shared or not.
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: Auke Kok <auke-jan.h.kok@intel.com>
* master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6:
[BRIDGE]: fix locking and memory leak in br_add_bridge
[IRDA]: Missing allocation result check in irlap_change_speed().
[PPPOE]: Missing result check in __pppoe_xmit().
[NET]: Eliminate unused /proc/sys/net/ethernet
[NETCONSOLE]: Clean up initcall warning.
[TCP]: Avoid skb_pull if possible when trimming head
There are several bugs in error handling in br_add_bridge:
- when dev_alloc_name fails, allocated net_device is not freed
- unregister_netdev is called when rtnl lock is held
- free_netdev is called before netdev_run_todo has a chance to be run after
unregistering net_device
Signed-off-by: Jiri Benc <jbenc@suse.cz>
Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Move memory_present() in arch/mips/kernel/setup.c. When using sparsemem
extreme, this function does an allocate for bootmem. This would always
fail since init_bootmem hasn't been called yet.
Move memory_present after free_bootmem. This only marks actual memory
ranges as present instead of the entire address space.
Signed-off-by: Chad Reese <creese@caviumnetworks.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Fix following warnings:
linux/arch/mips/kernel/setup.c:432: warning: field width is not type int (arg 2)
linux/arch/mips/kernel/setup.c:432: warning: field width is not type int (arg 4)
linux/arch/mips/kernel/syscall.c:279: warning: unused variable `len'
linux/arch/mips/kernel/syscall.c:280: warning: unused variable `name'
linux/arch/mips/math-emu/dp_fint.c:32: warning: unused variable `xc'
linux/arch/mips/math-emu/dp_flong.c:32: warning: unused variable `xc'
linux/arch/mips/math-emu/sp_fint.c:32: warning: unused variable `xc'
linux/arch/mips/math-emu/sp_flong.c:32: warning: unused variable `xc'
(original patch by Atsushi, slight changes to the setup.c part by me.)
Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
