I noticed that my KVM virtual machines were experiencing IDE
issues resulting in processes stuck on waiting for buffers to
complete.

The root cause is of course race conditions in the ancient qemu
backend that I'm using.  However, the fact that the guest isn't
recovering is a bug.

I've tracked it down to the change made last year to dequeue
requests at the start rather than at the end in the IDE layer.

commit 8f6205cd
Author: Tejun Heo <tj@kernel.org>
Date:   Fri May 8 11:53:59 2009 +0900

    ide: dequeue in-flight request

The problem is that the function ide_dma_timeout_retry does not
requeue the current request, causing one request to be lost for
each DMA timeout.

This patch fixes this by requeueing the request.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

This reverts commit a20b2a44.

As requested by David Fries.  This makes CDROMs which are slave drives
on a ribbon without a master disappear and causes other similar kinds
of badness.
Signed-off-by: David S. Miller <davem@davemloft.net>

This reverts commit f931a5d5.

It causes regressions for some users.
Signed-off-by: David S. Miller <davem@davemloft.net>

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6:
  x86/PCI: truncate _CRS windows with _LEN > _MAX - _MIN + 1
  x86/PCI: for host bridge address space collisions, show conflicting resource
  frv/PCI: remove redundant warnings
  x86/PCI: remove redundant warnings
  PCI: don't say we claimed a resource if we failed
  PCI quirk: Disable MSI on VIA K8T890 systems
  PCI quirk: RS780/RS880: work around missing MSI initialization
  PCI quirk: only apply CX700 PCI bus parking quirk if external VT6212L is present
  PCI: complain about devices that seem to be broken
  PCI: print resources consistently with %pR
  PCI: make disabled window printk style match the enabled ones
  PCI: break out primary/secondary/subordinate for readability
  PCI: for address space collisions, show conflicting resource
  resources: add interfaces that return conflict information
  PCI: cleanup error return for pcix get and set mmrbc functions
  PCI: fix access of PCI_X_CMD by pcix get and set mmrbc functions
  PCI: kill off pci_register_set_vga_state() symbol export.
  PCI: fix return value from pcix_get_max_mmrbc()

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ryusuke/nilfs2:
  nilfs2: fix imperfect completion wait in nilfs_wait_on_logs
  nilfs2: fix hang-up of cleaner after log writer returned with error
  nilfs2: fix duplicate call to nilfs_segctor_cancel_freev

* 'urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/brodo/pcmcia-2.6:
  pcmcia: use dev_pm_ops for class pcmcia_socket_class
  power: support _noirq actions on device types and classes
  pcmcia: allow for four multifunction subdevices (again)
  pcmcia: do not use ioports < 0x100 on x86
  pd6729: Coding Style fixes

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, amd: Restrict usage of c1e_idle()
  x86: Fix placement of FIX_OHCI1394_BASE
  x86: Handle legacy PIC interrupts on all the cpu's

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:
  time: Fix accumulation bug triggered by long delay.
  posix-cpu-timers: Reset expire cache when no timer is running
  timer stats: Fix del_timer_sync() and try_to_del_timer_sync()
  clockevents: Sanitize min_delta_ns adjustment and prevent overflows

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:
  ring-buffer: Do 8 byte alignment for 64 bit that can not handle 4 byte align

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: Use proper type in sched_getaffinity()
  kernel/sched.c: Suppress unused var warning
  sched: sched_getaffinity(): Allow less than NR_CPUS length

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

* 'perf-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  powerpc/perf_events: Fix call-graph recording, add perf_arch_fetch_caller_regs
  perf top: Add missing initialization to zero
  perf probe: Use original address instead of CU-based address
  perf probe: Fix offset to allow signed value
  perf top: Improve the autosizing of column lenghts
  perf probe: Fix need_dwarf flag if lazy matching is used
  perf probe: Fix probe_point buffer overrun

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: Move two IRQ functions from .init.text to .text
  genirq: Protect access to irq_desc->action in can_request_irq()
  genirq: Prevent oneshot irq thread race

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:
  x86: Remove excessive early_res debug output
  softlockup: Stop spurious softlockup messages due to overflow
  rcu: Fix local_irq_disable() CONFIG_PROVE_RCU=y false positives
  rcu: Fix tracepoints & lockdep false positive
  rcu: Make rcu_read_lock_bh_held() allow for disabled BH

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394-2.6:
  firewire: core: align driver match with modalias
  firewire: core: fix Model_ID in modalias
  firewire: ohci: add cycle timer quirk for the TI TSB12LV22
  firewire: core: fw_iso_resource_manage: fix error handling

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6:
  Restore LOOKUP_DIRECTORY hint handling in final lookup on open()

	Lose want_dir argument, while we are at it - since now
nd->flags & LOOKUP_DIRECTORY is equivalent to it.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

Fix __get_user_pages() to make it pin the last page on a buffer that doesn't
begin at the start of a page, but is a multiple of PAGE_SIZE in size.

The problem is that __get_user_pages() advances the pointer too much when it
iterates to the next page if the page it's currently looking at isn't used from
the first byte.  This can cause the end of a short VMA to be reached
prematurely, resulting in the last page being lost.
Signed-off-by: Steven J. Magnani <steve@digidescorp.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Revert the following patch:

	commit c08c6e1f
	Author: Steven J. Magnani <steve@digidescorp.com>
	Date:   Fri Mar 5 13:42:24 2010 -0800

	nommu: get_user_pages(): pin last page on non-page-aligned start

As it assumes that the mappings begin at the start of pages - something that
isn't necessarily true on NOMMU systems.  On NOMMU systems, it is possible for
a mapping to only occupy part of the page, and not necessarily touch either end
of it; in fact it's also possible for multiple non-overlapping mappings to
coexist on one page (consider direct mappings of ROMFS files, for example).
Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Steven J. Magnani <steve@digidescorp.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

* 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4:
  ext4: Fixed inode allocator to correctly track a flex_bg's used_dirs
  ext4: Don't use delayed allocation by default when used instead of ext3
  ext4: Fix spelling of CONTIG_FS_EXT3 to CONFIG_FS_EXT3
  ext4: Fix estimate of # of blocks needed to write indirect-mapped files

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6: (25 commits)
  TIPC: Removed inactive maintainer
  isdn: Cleanup Sections in PCMCIA driver elsa
  isdn: Cleanup Sections in PCMCIA driver avma1
  isdn: Cleanup Sections in PCMCIA driver teles
  isdn: Cleanup Sections in PCMCIA driver sedlbauer
  via-velocity: Fix FLOW_CNTL_TX_RX handling in set_mii_flow_control()
  netfilter: xt_hashlimit: IPV6 bugfix
  netfilter: ip6table_raw: fix table priority
  netfilter: xt_hashlimit: dl_seq_stop() fix
  af_key: return error if pfkey_xfrm_policy2msg_prep() fails
  skbuff: remove unused dma_head & dma_maps fields
  vlan: updates vlan real_num_tx_queues
  vlan: adds vlan_dev_select_queue
  igb: only use vlan_gro_receive if vlans are registered
  igb: do not modify tx_queue_len on link speed change
  igb: count Rx FIFO errors correctly
  bnx2: Use proper handler during netpoll.
  bnx2: Fix netpoll crash.
  ksz884x: fix return value of netdev_set_eeprom
  cgroups: net_cls as module
  ...

Signed-off-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Compiling this driver gave a section mismatch,
so I reviewed the init/exit paths of the driver
and made the correct changes.

WARNING: drivers/isdn/hisax/built-in.o(.text+0x55e37): Section mismatch
in reference from the function elsa_cs_config() to the function
.devinit.text:hisax_init_pcmcia()
The function elsa_cs_config() references
the function __devinit hisax_init_pcmcia().
This is often because elsa_cs_config lacks a __devinit
annotation or the annotation of hisax_init_pcmcia is wrong.
Signed-off-by: Henrik Kretzschmar <henne@nachtwindheim.de>
Acked-by: Karsten Keil <keil@b1-systems.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

Compiling this driver gave a section mismatch,
so I reviewed the init/exit paths of the driver
and made the correct changes.

WARNING: drivers/isdn/hisax/built-in.o(.text+0x56512): Section mismatch
in reference from the function avma1cs_config() to the function
.devinit.text:hisax_init_pcmcia()
The function avma1cs_config() references
the function __devinit hisax_init_pcmcia().
This is often because avma1cs_config lacks a __devinit
annotation or the annotation of hisax_init_pcmcia is wrong.
Signed-off-by: Henrik Kretzschmar <henne@nachtwindheim.de>
Acked-by: Karsten Keil <keil@b1-systems.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

Compiling this driver gave a section mismatch,
so I reviewed the init/exit paths of the driver
and made the correct changes.

WARNING: drivers/isdn/hisax/built-in.o(.text+0x56bfb): Section mismatch
in reference from the function teles_cs_config() to the function
.devinit.text:hisax_init_pcmcia()
The function teles_cs_config() references
the function __devinit hisax_init_pcmcia().
This is often because teles_cs_config lacks a __devinit
annotation or the annotation of hisax_init_pcmcia is wrong.
Signed-off-by: Henrik Kretzschmar <henne@nachtwindheim.de>
Acked-by: Karsten Keil <keil@b1-systems.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

Compiling this driver gave a section mismatch,
so I reviewed the init/exit paths of the driver
and made the correct changes.

WARNING: drivers/isdn/hisax/built-in.o(.text+0x558d6): Section mismatch
in reference from the function sedlbauer_config() to the function
.devinit.text:hisax_init_pcmcia()
The function sedlbauer_config() references
the function __devinit hisax_init_pcmcia().
This is often because sedlbauer_config lacks a __devinit
annotation or the annotation of hisax_init_pcmcia is wrong.
Signed-off-by: Henrik Kretzschmar <henne@nachtwindheim.de>
Acked-by: Karsten Keil <keil@b1-systems.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

Clear, don't set, ANAR_ASMDIR in this case.

Noticed by Roel Kluin.
Signed-off-by: David S. Miller <davem@davemloft.net>

Yanko's GA-MA78GM-S2H (BIOS F11) reports the following resource in a PCI
host bridge _CRS:

    [07] 32-Bit DWORD Address Space Resource
         Min Relocatability : MinFixed
         Max Relocatability : MaxFixed
            Address Minimum : CFF00000  (_MIN)
            Address Maximum : FEBFFFFF  (_MAX)
             Address Length : 3EE10000  (_LEN)

This is invalid per spec (ACPI 4.0, 6.4.3.5) because it's a fixed size,
fixed location descriptor, but _LEN != _MAX - _MIN + 1.

Based on https://bugzilla.kernel.org/show_bug.cgi?id=15480#c15, I think
Windows handles this by truncating the window so it fits between _MIN and
_MAX.  I also verified this by modifying the SeaBIOS DSDT and booting
Windows 2008 R2 with qemu.

This patch makes Linux truncate the window, too, which fixes:
    http://bugzilla.kernel.org/show_bug.cgi?id=15480Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Tested-by: Yanko Kaneti <yaneti@declera.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

With insert_resource_conflict(), we can learn what the actual conflict is,
so print that info for debugging purposes.
Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

A missing break statement in hashlimit_ipv6_mask(), and masks
between /64 and /95 are not working at all...
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: Patrick McHardy <kaber@trash.net>

pci_claim_resource() already prints more detailed error messages, so these
are really redundant.
Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

pci_claim_resource() already prints more detailed error messages, so these
are really redundant.
Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

pci_claim_resource() can fail, so pay attention and only claim success
when it actually succeeded.  If pci_claim_resource() fails, it prints a
useful diagnostic.
Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

Bugzilla 15287 indicates that there's a problem with Message Signalled
Interrupts on VIA K8T890 systems.  Add a quirk to disable MSI on these
systems.
Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
Tested-by: Jan Kreuzer <kontrollator@gmx.de>
Tested-by: lh <jarryson@gmail.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

The order of the IPv6 raw table is currently reversed, that makes impossible
to use the NOTRACK target in IPv6: for example if someone enters

ip6tables -t raw -A PREROUTING -p tcp --dport 80 -j NOTRACK

and if we receive fragmented packets then the first fragment will be
untracked and thus skip nf_ct_frag6_gather (and conntrack), while all
subsequent fragments enter nf_ct_frag6_gather and reassembly will never
successfully be finished.
Singed-off-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
Signed-off-by: Patrick McHardy <kaber@trash.net>

If dl_seq_start() memory allocation fails, we crash later in
dl_seq_stop(), trying to kfree(ERR_PTR(-ENOMEM))
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: Patrick McHardy <kaber@trash.net>

* 'for-linus' of git://gitorious.org/linux-omap-dss2/linux:
  OMAP: DSS2: panel-generic: re-implement mode changing
  OMAP: DSS2: initialize dss clk sources properly
  OMAP: DSS2: VRAM: Fix early_param for vram

* master.kernel.org:/home/rmk/linux-2.6-arm:
  [ARM] Orion5x: replace KEY_WLAN with KEY_WPS_BUTTON
  [ARM] Kirkwood: WPS button keycode mapping
  pxa168fb: fix incorrect resource calculation
  [ARM] pxa/raumfeld: fix button name
  [ARM] pxa/raumfeld: remove duplicated #include
  [ARM] locomo: fix unpaired spin_lock_irqsave
  [ARM] locomo: fix SPI register offset
  [ARM] pxa/sharpsl: add dependency of max1111 driver to sharpsl_pm
  [ARM] pxa: remove unnecessary 'select FB_W100' from some platforms
  [ARM] pxa: remove spi cs gpio direction to avoid clash with driver
  [ARM] mmp: fix for variables in uncompress.h being discarded
  [ARM] pxa: fix for variables in uncompress.h being discarded
  ARM: Update mach-types
  ARM: Fix IXP23xx build error in mach/memory.h

* 'bugfixes' of git://git.linux-nfs.org/projects/trondmy/nfs-2.6:
  NFS: don't try to decode GETATTR if DELEGRETURN returned error
  sunrpc: handle allocation errors from __rpc_lookup_create()
  SUNRPC: Fix the return value of rpc_run_bc_task()
  SUNRPC: Fix a use after free bug with the NFSv4.1 backchannel
  SUNRPC: Fix a potential memory leak in auth_gss
  NFS: Prevent another deadlock in nfs_release_page()

* 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jgarzik/libata-dev:
  libata-sff: fix spurious IRQ handling
  pata_via: Add VIA VX900 support