This patch is used to solve the memory bug when people plug out the wusb card then plug in.
Error logs are following:

root@smdk2440:~# ifdown eth1
AP deauthed me, reason=2.
Config_FileOperation file Not exist
Zone=[1][J][P]!!
WPA: Terminating
root@smdk2440:~#  ----> !!!!!!!!!!!!!!here plug out the wusbcard
usb 1-1: USB disconnect, address 4
----> !!!!!!!!!!!!!!!!!!!here plug in the wusb card
usb 1-1: new full speed USB device using s3c2410-ohci and address 5
usb 1-1: New USB device found, idVendor=160a, idProduct=3184
usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
usb 1-1: Product: VNT USB-802.11 Wireless LAN Adapter
usb 1-1: Manufacturer: VIA Networking Technologies, Inc.
usb 1-1: configuration #1 chosen from 1 choice
VIA Networking Wireless LAN USB Driver Ver. 1.19_12
Copyright (c) 2004 VIA Networking Technologies, Inc.
kernel BUG at mm/slab.c:2974!
Unable to handle kernel NULL pointer dereference at virtual address 00000000
pgd = c0004000
[00000000] *pgd=00000000
Internal error: Oops: 817 [#1] PREEMPT
Modules linked in: vt6656_stage
CPU: 0    Not tainted  (2.6.32-rc2 #14)
PC is at __bug+0x1c/0x28
LR is at __bug+0x18/0x28
pc : [<c002fb10>]    lr : [<c002fb0c>]    psr: 40000093
sp : c3867c68  ip : c3867bd0  fp : c3866000
r10: c3800600  r9 : c3802430  r8 : 00000004
r7 : c3802428  r6 : c3802660  r5 : c3802420  r4 : a0000013
r3 : 00000000  r2 : c3866000  r1 : 00000003  r0 : 00000024
Flags: nZcv  IRQs off  FIQs on  Mode SVC_32  ISA ARM  Segment kernel
Control: 0000717f  Table: 330a8000  DAC: 00000017
Process khubd (pid: 152, stack limit = 0xc3866270)
Stack: (0xc3867c68 to 0xc3868000)
7c60:                   c0093fdc c0094088 000000d0 000000d0 00000000 000080d0
7c80: 00000000 a0000013 c39ebec0 c3800600 000080d0 00000001 c03f13cc 00000006
7ca0: c02b36f0 c0094574 c0043428 0001c9de c39ebec0 c39ebea0 c3000c00 c02a6a84
7cc0: 89705f41 c3000c00 c39ebec0 c39ebea0 c3000c00 bf036f24 c39ebec8 00000006
7ce0: 00000000 c3000c00 c39ebec0 c39ebea0 c3000c00 bf036f24 c39ebec8 00000006
7d00: 00000000 bf003398 c00aa514 c3867d20 0000a1ff c00e1448 c39d9f84 c39aabe8
7d20: c3867d50 c00e1888 c39aabe8 c39ebea0 c39ebec0 bf036ebc c3000c00 bf036f24
7d40: 0000bec8 01000000 00000000 c39ebea0 c39ebec0 bf036ebc c3000c00 bf036f24
7d60: c39ebec8 00000000 00000000 c0223798 c39ebec0 c01daa14 bf036eec c3867da0
7d80: c045a4f8 c01da6e4 c39ebec0 00000000 c01daa14 c39ebec0 c3867da0 c01d9870
7da0: c38331a8 c39fcb94 c005b3b4 c39ebec0 c39ebec0 c39ebef4 00000000 c01da890
7dc0: c39ebec0 c39ebec0 c3000c00 c01d97f4 00000000 c01d8470 c39ebea0 c3000c68
7de0: 00000000 c3000c68 c3218a00 c3abcd20 00000001 c39ebec0 c39ebea0 c3000c00
7e00: 00000000 c3000c68 c3218a00 c3abcd20 00000001 c0221ee8 00000001 00000000
7e20: 00000000 00000000 00001388 00000000 c3000c04 c3000c68 c3bc29c0 00000001
7e40: c3bc29c4 00000001 c03f4af8 00000000 c39fe780 c3000c00 00000001 c045ab04
7e60: c3867eb8 c045a3bc c3000c70 00000000 00000000 c0229238 c3000c68 c0223210
7e80: c3000c00 c045aaf0 c045ab04 c0223230 c3000c68 c01daa14 c045ab04 c01da6e4
7ea0: c3000c68 00000000 c01daa14 c3000c68 c3867eb8 c01d9870 c38331a8 c3862f54
7ec0: c005b3b4 c3000c68 c3000c68 c3000c9c 00000002 c01da890 c3867ef9 c3000c68
7ee0: c3829f60 c01d97f4 00000000 c01d8470 c38918e0 c3aaf468 39383102 c300343a
7f00: 00000001 c0219660 c03f1768 c3000c00 00000000 c3000c68 00000002 c3aaf814
7f20: 00000001 00000101 c38918e0 c021b6e0 00000002 00000000 00000000 c3000c00
7f40: c38917c0 c021c418 00000064 00000064 00000101 c3867f60 c005b920 c3867f94
7f60: c3891830 c3aaf400 c3866000 c3aaf400 c3aaf800 00000000 c38918e0 c3aaf400
7f80: 00000012 00000000 00000000 c3837920 c00574a0 c3867f94 c3867f94 00000101
7fa0: 01010001 c3867fd4 c381bf48 c3867fd4 c381bf48 00000000 c021ba3c 00000000
7fc0: 00000000 00000000 00000000 c00573dc 00000000 00000000 c3867fd8 c3867fd8
7fe0: 00000000 00000000 00000000 00000000 00000000 c002ce88 00000000 ffff0000
[<c002fb10>] (__bug+0x1c/0x28) from [<c0094088>] (cache_alloc_refill+0x13c/0x594)
[<c0094088>] (cache_alloc_refill+0x13c/0x594) from [<c0094574>] (__kmalloc+0x94/0xd0)
[<c0094574>] (__kmalloc+0x94/0xd0) from [<c02a6a84>] (alloc_netdev_mq+0x48/0x1b0)
[<c02a6a84>] (alloc_netdev_mq+0x48/0x1b0) from [<bf003398>] (vntwusb_found1+0x58/0x53c [vt6656_stage])
[<bf003398>] (vntwusb_found1+0x58/0x53c [vt6656_stage]) from [<c0223798>] (usb_probe_interface+0x130/0x180)
[<c0223798>] (usb_probe_interface+0x130/0x180) from [<c01da6e4>] (driver_probe_device+0xac/0x164)
[<c01da6e4>] (driver_probe_device+0xac/0x164) from [<c01d9870>] (bus_for_each_drv+0x50/0x90)
[<c01d9870>] (bus_for_each_drv+0x50/0x90) from [<c01da890>] (device_attach+0x50/0x68)
[<c01da890>] (device_attach+0x50/0x68) from [<c01d97f4>] (bus_probe_device+0x28/0x54)
[<c01d97f4>] (bus_probe_device+0x28/0x54) from [<c01d8470>] (device_add+0x3b4/0x4f0)
[<c01d8470>] (device_add+0x3b4/0x4f0) from [<c0221ee8>] (usb_set_configuration+0x524/0x5b8)
[<c0221ee8>] (usb_set_configuration+0x524/0x5b8) from [<c0229238>] (generic_probe+0x5c/0xa0)
[<c0229238>] (generic_probe+0x5c/0xa0) from [<c0223230>] (usb_probe_device+0x48/0x54)
[<c0223230>] (usb_probe_device+0x48/0x54) from [<c01da6e4>] (driver_probe_device+0xac/0x164)
[<c01da6e4>] (driver_probe_device+0xac/0x164) from [<c01d9870>] (bus_for_each_drv+0x50/0x90)
[<c01d9870>] (bus_for_each_drv+0x50/0x90) from [<c01da890>] (device_attach+0x50/0x68)
[<c01da890>] (device_attach+0x50/0x68) from [<c01d97f4>] (bus_probe_device+0x28/0x54)
[<c01d97f4>] (bus_probe_device+0x28/0x54) from [<c01d8470>] (device_add+0x3b4/0x4f0)
[<c01d8470>] (device_add+0x3b4/0x4f0) from [<c021b6e0>] (usb_new_device+0x100/0x174)
[<c021b6e0>] (usb_new_device+0x100/0x174) from [<c021c418>] (hub_thread+0x9dc/0xeec)
[<c021c418>] (hub_thread+0x9dc/0xeec) from [<c00573dc>] (kthread+0x78/0x80)
[<c00573dc>] (kthread+0x78/0x80) from [<c002ce88>] (kernel_thread_exit+0x0/0x8)
Code: e1a01000 e59f000c eb005014 e3a03000 (e5833000)
---[ end trace 2a51e0dbab9e4fbe ]---
note: khubd[152] exited with preempt_count 1
Signed-off-by: miaofng <miaofng@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

This patch prevents the driver from calling misc_deregister twice on the same
ressouce when unloading the driver.
Unloading the driver without this patch results in a Kernel BUG like this:
Panel driver version 0.9.5 registered on parport0 (io=0x378).
BUG: unable to handle kernel paging request at 0000000000100108
IP: [<ffffffff803c02ee>] misc_deregister+0x2d/0x90
PGD 6caff067 PUD 762b7067 PMD 0
Oops: 0002 [#1] PREEMPT SMP
last sysfs file: /sys/devices/platform/w83627hf.656/in8_input
...

This patch fixes this issue, although maybe not in the best way possible :)

linux version v2.6.32-rc1 - linus git tree, Di 29. Sep 01:10:18 CEST 2009
Signed-off-by: Peter Huewe <peterhuewe@gmx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

Add missing #includes to make hv module compile successfull.
Signed-off-by: Milan Dadok <milan@dadok.name>
Cc: Hank Janssen <hjanssen@microsoft.com>
Cc: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

Remove incorrect list_head usage. Variable of type list_head was used in
some function's arguments as list item.
Signed-off-by: Milan Dadok <milan@dadok.name>
Cc: Hank Janssen <hjanssen@microsoft.com>
Cc: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

Fix typos in udev event send and guid variables copy
Signed-off-by: Milan Dadok <milan@dadok.name>
Cc: Hank Janssen <hjanssen@microsoft.com>
Cc: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

Fix vmbus load hang caused by wrong data packing.

Signed-off-by: Hank Janssen<hjanssen@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

Fix null pointer error after vmbus loading. Remove code that checks for
dev_name, the affected structure is kzalloc-ed prior to this routine, so
it is always null at this stage.
Signed-off-by: Hank Janssen <hjanssen@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

Update for more items
Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Cc: Hank Janssen <hjanssen@microsoft.com>
Cc: Haiyang Zhang <haiyangz@microsoft.com>.
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

* 'bugfix' of git://git.kernel.org/pub/scm/linux/kernel/git/jeremy/xen:
  xen: set up mmu_ops before trying to set any ptes

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/ide-2.6:
  ide: Serialize CMD643 and CMD646 to fix a hardware bug with SSD

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6: (43 commits)
  net: Fix 'Re: PACKET_TX_RING: packet size is too long'
  netdev: usb: dm9601.c can drive a device not supported yet, add support for it
  qlge: Fix firmware mailbox command timeout.
  qlge: Fix EEH handling.
  AF_RAW: Augment raw_send_hdrinc to expand skb to fit iphdr->ihl (v2)
  bonding: fix a race condition in calls to slave MII ioctls
  virtio-net: fix data corruption with OOM
  sfc: Set ip_summed correctly for page buffers passed to GRO
  cnic: Fix L2CTX_STATUSB_NUM offset in context memory.
  MAINTAINERS: rt2x00 list is moderated
  airo: Reorder tests, check bounds before element
  mac80211: fix for incorrect sequence number on hostapd injected frames
  libertas spi: fix sparse errors
  mac80211: trivial: fix spelling in mesh_hwmp
  cfg80211: sme: deauthenticate on assoc failure
  mac80211: keep auth state when assoc fails
  mac80211: fix ibss joining
  b43: add 'struct b43_wl' missing declaration
  b43: Fix Bugzilla #14181 and the bug from the previous 'fix'
  rt2x00: Fix crypto in TX frame for rt2800usb
  ...

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu:
  sched: move rq_weight data array out of .percpu
  percpu: allow pcpu_alloc() to be called with IRQs off

* git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-param-fixes:
  param: fix setting arrays of bool
  param: fix NULL comparison on oom
  param: fix lots of bugs with writing charp params from sysfs, by leaking mem.

* git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-for-linus:
  virtio: order used ring after used index read
  virtio-pci: fix per-vq MSI-X request logic

* 'for-linus' of git://git.kernel.dk/linux-2.6-block:
  backing-dev: ensure that a removed bdi no longer has super_block referencing it
  block: use after free bug in __blkdev_get
  block: silently error unsupported empty barriers too

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6:
  Revert "PCI: get larger bridge ranges when space is available"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/roland/infiniband:
  mlx4_core: Add a new supported 40 GigE device ID

* git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-rc-fixes-2.6:
  [SCSI] zfcp: Flush SCSI registration work when adding unit
  [SCSI] zfcp: Fix timer initialization for ct and els requests
  [SCSI] zfcp: Warn about storage devices with broken PLOGI data
  [SCSI] zfcp: Handle WWPN mismatch in PLOGI payload
  [SCSI] zfcp: fix kfree handling in zfcp_init_device_setup
  [SCSI] fix memory leak in initialization

* 'drm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied/drm-2.6:
  drm/kms: fix kms/fbdev colormap support properly.
  drm: Add the basic check for the detailed timing in EDID
  drm/radeon/kms: ignore vga arbiter return.

* 'sh/for-2.6.32' of git://git.kernel.org/pub/scm/linux/kernel/git/lethal/sh-2.6:
  sh: Fix hugetlbfs dependencies for SH-3 && MMU configurations.
  sh: Document uImage.bin target in archhelp.
  sh: add uImage.bin target
  sh: rsk7203 CONFIG_MTD=n fix
  sh: Check for return_to_handler when unwinding the stack
  sh: Build fix: define more __movmem* symbols
  sh: __irq_entry annotate do_IRQ().

Fix up sh/powerpc conflicts in fs/Kconfig

* 'bugfixes' of git://git.linux-nfs.org/projects/trondmy/nfs-2.6:
  NFSv4: The link() operation should return any delegation on the file
  NFSv4: Fix two unbalanced put_rpccred() issues.
  NFSv4: Fix a bug when the server returns NFS4ERR_RESOURCE
  nfs: Panic when commit fails

* git://git.kernel.org/pub/scm/linux/kernel/git/sfrench/cifs-2.6:
  [CIFS] Fixing to avoid invalid kfree() in cifs_get_tcp_session()

I've not touched the other stuff here but the word "locking" comes to mind.
Signed-off-by: Alan Cox <alan@linux.intel.com>
Cc: stable@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Signed-off-by: Alan Cox <alan@linux.intel.com>
Cc: stable@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

* 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc:
  powerpc/ppc64: Use preempt_schedule_irq instead of preempt_schedule
  powerpc: Minor cleanup to lib/Kconfig.debug
  powerpc: Minor cleanup to sound/ppc/Kconfig
  powerpc: Minor cleanup to init/Kconfig
  powerpc: Limit memory hotplug support to PPC64 Book-3S machines
  powerpc: Limit hugetlbfs support to PPC64 Book-3S machines
  powerpc: Fix compile errors found by new ppc64e_defconfig
  powerpc: Add a Book-3E 64-bit defconfig
  powerpc/booke: Fix xmon single step on PowerPC Book-E
  powerpc: Align vDSO base address
  powerpc: Fix segment mapping in vdso32
  powerpc/iseries: Remove compiler version dependent hack
  powerpc/perf_events: Fix priority of MSR HV vs PR bits
  powerpc/5200: Update defconfigs
  drivers/serial/mpc52xx_uart.c: Use UPIO_MEM rather than SERIAL_IO_MEM
  powerpc/boot/dts: drop obsolete 'fsl5200-clocking'
  of: Remove nested function
  mpc5200: support for the MAN mpc5200 based board mucmc52
  mpc5200: support for the MAN mpc5200 based board uc101

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sameo/mfd-2.6:
  mfd: Do not dereference null pointer in twl4030 error path
  mfd: Always initialise WM831x IRQ mutex

* 'hwpoison-2.6.32' of git://git.kernel.org/pub/scm/linux/kernel/git/ak/linux-mce-2.6:
  HWPOISON: fix invalid page count in printk output
  HWPOISON: Allow schedule_on_each_cpu() from keventd
  HWPOISON: fix/proc/meminfo alignment
  HWPOISON: fix oops on ksm pages
  HWPOISON: Fix page count leak in hwpoison late kill in do_swap_page
  HWPOISON: return early on non-LRU pages
  HWPOISON: Add brief hwpoison description to Documentation
  HWPOISON: Clean up PR_MCE_KILL interface

* 'for-linus' of git://oss.sgi.com/xfs/xfs:
  xfs: fix double IRELE in xfs_dqrele_inode

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

* 'omap-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap-2.6:
  omap4: Fix UART4 platform data on omap4
  omap4: Allow omap_serial_early_init() for OMAP4430 board
  omap3: PM: enable UART3 module wakeups
  omap2: Fix console serial port number for n8x0
  omap2: Fix detection of n8x0
  omap1: Fix DSP public peripherals support for ams-delta
  omap1: Fix redundant UARTs pin muxing that can break other hardware support
  omap: iommu: fix wrong condition check for SUPERSECTION
  omap: SDMA: Fix omap_stop_dma() API for channel linking
  omap: Fix omap-keypad by restoring old keypad.h without breaking omap2 boards that use matrix_keypad

* 'for-linus' of git://git.infradead.org/ubi-2.6:
  UBI: fix check on unsigned long
  UBI: fix backward compatibility

* 'hwmon-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jdelvare/staging:
  hwmon: (it87) Fix VID reading on IT8718F/IT8720F
  hwmon: (dme1737) No vid attributes for SCH311x
  hwmon: (fschmd) Fix check on unsigned in watchdog_write()
  hwmon: (coretemp) Maintainer update

* 'urgent-v2' of git://git.kernel.org/pub/scm/linux/kernel/git/brodo/pcmcia-2.6:
  pcmcia: do not load the pd6729 driver if io_base is NULL
  pcmcia: Fix possible printk format warnings
  pcmcia: do not try to store more than 4 version strings
  pcmcia: pccard_read_tuple and TUPLE_RETURN_COMMON cleanup
  pcmcia: properly close previous dev_printk if kzalloc fails in do_io_probe
  pcmcia: fix controller printk format warnings

* master.kernel.org:/home/rmk/linux-2.6-arm: (22 commits)
  ARM: Fix lubbock defconfig build
  ARM: 5769/1: CPU_ARM920T: remove dead Maverick EP9312 URL
  ARM: 5768/1: ep93xx: remove dead code in ep93xx_gpio_ab_irq_handler()
  ARM: 5767/1: ep93xx: remove ep93xx_init_time() prototype
  ARM: 5765/1: Updated U300 defconfig
  ARM: 5766/1: Fix watchdog enabling for AT91SAM9G45
  ARM: 5764/1: bcmring: add oprofile pmu support
  [ARM] pxa/spitz: add gpio button support (fixes regression)
  [ARM] pxa/cm-x300: fix mmc numbering
  ARM: 5763/1: ARM: SMP: Fix the BUG with CONFIG_PREEMPT enabled
  ARM: 5760/1: ep93xx: fix build error in edb93xx.c
  ARM: 5759/1: Add register information of threads to coredump
  ARM: 5757/1: Thumb-2: Correct "mov.w pc, lr" instruction which is unpredictable
  MXC: fix reset for mx31, mx35 and mx27 SoCs
  fix pcm037_eet compilation with the new SPI driver
  fix compilation of i.MX31 platforms
  pcm970 mmc: Fix ro switch
  pcm038: Add SPI/MC13783 support
  mx25: Add missing copyright / license header
  mx25pdk: remove nand support as it is not present in current tree
  ...

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:
  futex: Move drop_futex_key_refs out of spinlock'ed region
  rcu: Fix TREE_PREEMPT_RCU CPU_HOTPLUG bad-luck hang
  rcu: Stopgap fix for synchronize_rcu_expedited() for TREE_PREEMPT_RCU
  rcu: Prevent RCU IPI storms in presence of high call_rcu() load
  futex: Check for NULL keys in match_futex
  futex: Handle spurious wake up

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:
  perf timechart: Improve the visual appearance of scheduler delays
  perf timechart: Fix the wakeup-arrows that point to non-visible processes
  perf top: Fix --delay_secs 0 division by zero
  perf tools: Bump version to 0.0.2
  perf_event: Adjust frequency and unthrottle for non-group-leader events

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: Do less agressive buddy clearing
  sched: Disable SD_PREFER_LOCAL for MC/CPU domains

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, UV: Set DELIVERY_MODE=4 for vector=NMI_VECTOR in uv_hub_send_ipi()
  x86, UV: Fix and clean up bau code to use uv_gpa_to_pnode()
  x86: Don't print number of MCE banks for every CPU
  x86, UV: Fix information in __uv_hub_info structure
  x86: Document linker script ASSERT() quirk

syscallno is unsigned
Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

There are some places where we do like:

	pte = pte_map();
	do {
		(do break in some conditions)
	} while (pte++, ...);
	pte_unmap(pte - 1);

But if the loop breaks at the first loop, pte_unmap() unmaps invalid pte.

This patch is a fix for this problem.
Signed-off-by: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Reviewd-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Acked-by: Hugh Dickins <hugh.dickins@tiscali.co.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

I have an HP HDX 18 laptop, and noted that the configuration of the
accelerometer needs to be x_inverted.
Signed-off-by: Ian E. Morgan <penguin.wrangler@gmail.com>
Signed-off-by: Éric Piel <eric.piel@tremplin-utc.net>
Cc: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>