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Commits on Dec 12, 2009
  1. Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6

    torvalds committed Dec 12, 2009
    * git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6: (75 commits)
      net: Handle NETREG_UNINITIALIZED devices correctly
      can: add the driver for Analog Devices Blackfin on-chip CAN controllers
      xfrm: Fix truncation length of authentication algorithms installed via PF_KEY
      net: use compat helper functions in compat_sys_recvmmsg
      net: fix compat_sys_recvmmsg parameter type
      cxgb3: Fixing EEH handlers
      cnic: Zero out status block and Event Queue indices.
      cnic: Send delete command when shutting down iSCSI ring.
      net: smc91x: Fix up type mismatch in smc_drv_resume().
      smc91x: fix unused flags warnings on UP systems
      MAINTAINERS: Transfering maintainership of cdc-ether
      net: Add missing TST_CFG_WRITE bits around sky2_pci_write
      net: Fix Yukon-2 Optima TCP offload setup
      net: niu uses crc32, so select CRC32
      wireless: update old static regulatory domain rules
      mac80211: Revert 'Use correct sign for mesh active path refresh'
      mac80211: Fixed bug in mesh portal paths
      net/mac80211: Correct size given to memset
      b43: Remove reset after fatal DMA error
      rtl8187: add radio led and fix warnings on suspend
      ...
  2. Merge branch 'compat-ioctl-merge' of git://git.kernel.org/pub/scm/lin…

    torvalds committed Dec 12, 2009
    …ux/kernel/git/arnd/playground
    
    * 'compat-ioctl-merge' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/playground:
      usbdevfs: move compat_ioctl handling to devio.c
      lp: move compat_ioctl handling into lp.c
      compat_ioctl: pass compat pointer directly to handlers
      compat_ioctl: simplify lookup table
      compat_ioctl: simplify calling of handlers
      compat_ioctl: inline all conversion handlers
      compat_ioctl: Remove BKL
      compat_ioctl: remove all VT ioctl handling
  3. Merge git://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic

    torvalds committed Dec 12, 2009
    * git://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic:
      asm-generic: add sys_recvmmsg to unistd.h
      asm-generic: add sys_accept4 to unistd.h
      asm-generic/gpio.h: add some forward decls of the device struct
      asm-generic: Fix typo in asm-generic/unistd.h.
      lib/checksum: fix one more thinko
      lib/checksum.c: make do_csum optional
      lib/checksum.c: use 32-bit arithmetic consistently
  4. Merge branch 'timers-fixes-for-linus' of git://git.kernel.org/pub/scm…

    torvalds committed Dec 12, 2009
    …/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:
      itimer: Fix the itimer trace print format
      hrtimer: move timer stats helper functions to hrtimer.c
      hrtimer: Tune hrtimer_interrupt hang logic
  5. Merge branch 'core-fixes-for-linus' of git://git.kernel.org/pub/scm/l…

    torvalds committed Dec 12, 2009
    …inux/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: Avoid out of bounds array reference in save_trace()
      futex: Take mmap_sem for get_user_pages in fault_in_user_writeable
      lockstat: Add usage info to Documentation/lockstat.txt
      lockstat: Fix min, max times in /proc/lock_stats
  6. Merge branch 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/li…

    torvalds committed Dec 12, 2009
    …nux/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-iommu: Fix PCI hotplug with passthrough mode
      x86/amd-iommu: Fix passthrough mode
      x86: mmio-mod.c: Use pr_fmt
      x86: kmmio.c: Add and use pr_fmt(fmt)
      x86: i8254.c: Add pr_fmt(fmt)
      x86: setup_percpu.c: Use pr_<level> and add pr_fmt(fmt)
      x86: es7000_32.c: Use pr_<level> and add pr_fmt(fmt)
      x86: Print DMI_BOARD_NAME as well as DMI_PRODUCT_NAME from __show_regs()
      x86: Factor duplicated code out of __show_regs() into show_regs_common()
      arch/x86/kernel/microcode*: Use pr_fmt() and remove duplicated KERN_ERR prefix
      x86, mce: fix confusion between bank attributes and mce attributes
      x86/mce: Set up timer unconditionally
      x86: Fix bogus warning in apic_noop.apic_write()
      x86: Fix typo in arch/x86/mm/kmmio.c
      x86: ASUS P4S800 reboot=bios quirk
  7. Merge branch 'tracing-fixes-for-linus' of git://git.kernel.org/pub/sc…

    torvalds committed Dec 12, 2009
    …m/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:
      tracing: Remove comparing of NULL to va_list in trace_array_vprintk()
      tracing: Fix function graph trace_pipe to properly display failed entries
      tracing: Add full state to trace_seq
      tracing: Buffer the output of seq_file in case of filled buffer
      tracing: Only call pipe_close if pipe_close is defined
      tracing: Add pipe_close interface
  8. Merge branch 'perf-fixes-for-linus' of git://git.kernel.org/pub/scm/l…

    torvalds committed Dec 12, 2009
    …inux/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: (57 commits)
      x86, perf events: Check if we have APIC enabled
      perf_event: Fix variable initialization in other codepaths
      perf kmem: Fix unused argument build warning
      perf symbols: perf_header__read_build_ids() offset'n'size should be u64
      perf symbols: dsos__read_build_ids() should read both user and kernel buildids
      perf tools: Align long options which have no short forms
      perf kmem: Show usage if no option is specified
      sched: Mark sched_clock() as notrace
      perf sched: Add max delay time snapshot
      perf tools: Correct size given to memset
      perf_event: Fix perf_swevent_hrtimer() variable initialization
      perf sched: Fix for getting task's execution time
      tracing/kprobes: Fix field creation's bad error handling
      perf_event: Cleanup for cpu_clock_perf_event_update()
      perf_event: Allocate children's perf_event_ctxp at the right time
      perf_event: Clean up __perf_event_init_context()
      hw-breakpoints: Modify breakpoints without unregistering them
      perf probe: Update perf-probe document
      perf probe: Support --del option
      trace-kprobe: Support delete probe syntax
      ...
  9. Merge branch 'for-linus' of git://codeaurora.org/quic/kernel/dwalker/…

    torvalds committed Dec 12, 2009
    …linux-msm
    
    * 'for-linus' of git://codeaurora.org/quic/kernel/dwalker/linux-msm:
      HTC Dream: mmc compilation fixes
      video: Allow selecting MSM framebuffer in Kconfig
      Add arm msm maintainer entry
      msm: Add memory map for HTC Dream
      msm: add minimal board file for HTC Dream device
      msm: make debugging UART (for DEBUG_LL) configurable
  10. Merge branch 'master' of /home/davem/src/GIT/linux-2.6/

    davem330 committed Dec 12, 2009
    Conflicts:
    	include/net/tcp.h
Commits on Dec 11, 2009
  1. Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/…

    torvalds committed Dec 11, 2009
    …davej/cpufreq
    
    * 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/davej/cpufreq:
      [ACPI/CPUFREQ] Introduce bios_limit per cpu cpufreq sysfs interface
      [CPUFREQ] make internal cpufreq_add_dev_* static
      [CPUFREQ] use an enum for speedstep processor identification
      [CPUFREQ] Document units for transition latency
      [CPUFREQ] Use global sysfs cpufreq structure for conservative governor tunings
      [CPUFREQ] Documentation: ABI: /sys/devices/system/cpu/cpu#/cpufreq/
      [CPUFREQ] powernow-k6: set transition latency value so ondemand governor can be used
      [CPUFREQ] cpumask: don't put a cpumask on the stack in x86...cpufreq/powernow-k8.c
  2. Staging: batman: fix debug Kconfig option

    gregkh committed with torvalds Dec 11, 2009
    The debug batman option needs to depend on the correct
    config option.
    
    Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
    [ "No means no!"  - Linus ]
    Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
  3. Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty-2.6

    torvalds committed Dec 11, 2009
    * git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty-2.6: (58 commits)
      tty: split the lock up a bit further
      tty: Move the leader test in disassociate
      tty: Push the bkl down a bit in the hangup code
      tty: Push the lock down further into the ldisc code
      tty: push the BKL down into the handlers a bit
      tty: moxa: split open lock
      tty: moxa: Kill the use of lock_kernel
      tty: moxa: Fix modem op locking
      tty: moxa: Kill off the throttle method
      tty: moxa: Locking clean up
      tty: moxa: rework the locking a bit
      tty: moxa: Use more tty_port ops
      tty: isicom: fix deadlock on shutdown
      tty: mxser: Use the new locking rules to fix setserial properly
      tty: mxser: use the tty_port_open method
      tty: isicom: sort out the board init logic
      tty: isicom: switch to the new tty_port_open helper
      tty: tty_port: Add a kref object to the tty port
      tty: istallion: tty port open/close methods
      tty: stallion: Convert to the tty_port_open/close methods
      ...
  4. Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel…

    torvalds committed Dec 11, 2009
    …/git/jack/linux-fs-2.6
    
    * 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs-2.6: (21 commits)
      ext3: PTR_ERR return of wrong pointer in setup_new_group_blocks()
      ext3: Fix data / filesystem corruption when write fails to copy data
      ext4: Support for 64-bit quota format
      ext3: Support for vfsv1 quota format
      quota: Implement quota format with 64-bit space and inode limits
      quota: Move definition of QFMT_OCFS2 to linux/quota.h
      ext2: fix comment in ext2_find_entry about return values
      ext3: Unify log messages in ext3
      ext2: clear uptodate flag on super block I/O error
      ext2: Unify log messages in ext2
      ext3: make "norecovery" an alias for "noload"
      ext3: Don't update the superblock in ext3_statfs()
      ext3: journal all modifications in ext3_xattr_set_handle
      ext2: Explicitly assign values to on-disk enum of filetypes
      quota: Fix WARN_ON in lookup_one_len
      const: struct quota_format_ops
      ubifs: remove manual O_SYNC handling
      afs: remove manual O_SYNC handling
      kill wait_on_page_writeback_range
      vfs: Implement proper O_SYNC semantics
      ...
  5. Merge branch 'for-linus' of git://oss.sgi.com/xfs/xfs

    torvalds committed Dec 11, 2009
    * 'for-linus' of git://oss.sgi.com/xfs/xfs:
      xfs: Fix error return for fallocate() on XFS
      xfs: cleanup dmapi macros in the umount path
      xfs: remove incorrect sparse annotation for xfs_iget_cache_miss
      xfs: kill the STATIC_INLINE macro
      xfs: uninline xfs_get_extsz_hint
      xfs: rename xfs_attr_fetch to xfs_attr_get_int
      xfs: simplify xfs_buf_get / xfs_buf_read interfaces
      xfs: remove IO_ISAIO
      xfs: Wrapped journal record corruption on read at recovery
      xfs: cleanup data end I/O handlers
      xfs: use WRITE_SYNC_PLUG for synchronous writeout
      xfs: reset the i_iolock lock class in the reclaim path
      xfs: I/O completion handlers must use NOFS allocations
      xfs: fix mmap_sem/iolock inversion in xfs_free_eofblocks
      xfs: simplify inode teardown
  6. Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging-2.6

    torvalds committed Dec 11, 2009
    * git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging-2.6: (235 commits)
      Staging: IIO: add selection of IIO_SW_RING to LIS3L02DQ as needed
      Staging: IIO: Add tsl2560-2 support to tsl2563 driver.
      Staging: IIO: Remove tsl2561 driver. Support merged with tsl2563.
      Staging: wlags49_h2: fix up signal levels
      + drivers-staging-wlags49_h2-remove-cvs-metadata.patch added to -mm tree
      Staging: samsung-laptop: add TODO file
      Staging: samsung-laptop: remove old kernel code
      Staging: add Samsung Laptop driver
      staging: batman-adv meshing protocol
      Staging: rtl8192u: depends on USB
      Staging: rtl8192u: remove dead code
      Staging: rtl8192u: remove bad whitespaces
      Staging: rtl8192u: make it compile
      Staging: Added Realtek rtl8192u driver to staging
      Staging: dream: add gpio and pmem support
      Staging: dream: add TODO file
      Staging: android: delete android drivers
      Staging: et131x: clean up the avail fields in the rx registers
      Staging: et131x: Clean up number fields
      Staging: et131x: kill RX_DMA_MAX_PKT_TIME
      ...
  7. Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-cor…

    torvalds committed Dec 11, 2009
    …e-2.6
    
    * git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core-2.6: (27 commits)
      Driver core: fix race in dev_driver_string
      Driver Core: Early platform driver buffer
      sysfs: sysfs_setattr remove unnecessary permission check.
      sysfs: Factor out sysfs_rename from sysfs_rename_dir and sysfs_move_dir
      sysfs: Propagate renames to the vfs on demand
      sysfs: Gut sysfs_addrm_start and sysfs_addrm_finish
      sysfs: In sysfs_chmod_file lazily propagate the mode change.
      sysfs: Implement sysfs_getattr & sysfs_permission
      sysfs: Nicely indent sysfs_symlink_inode_operations
      sysfs: Update s_iattr on link and unlink.
      sysfs: Fix locking and factor out sysfs_sd_setattr
      sysfs: Simplify iattr time assignments
      sysfs: Simplify sysfs_chmod_file semantics
      sysfs: Use dentry_ops instead of directly playing with the dcache
      sysfs: Rename sysfs_d_iput to sysfs_dentry_iput
      sysfs: Update sysfs_setxattr so it updates secdata under the sysfs_mutex
      debugfs: fix create mutex racy fops and private data
      Driver core: Don't remove kobjects in device_shutdown.
      firmware_class: make request_firmware_nowait more useful
      Driver-Core: devtmpfs - set root directory mode to 0755
      ...
  8. Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb-2.6

    torvalds committed Dec 11, 2009
    * git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb-2.6: (122 commits)
      USB: mos7840: add device IDs for B&B electronics devices
      USB: ftdi_sio: add USB device ID's for B&B Electronics line
      USB: musb: musb_host: fix sparse warning
      USB: musb: musb_gadget: fix sparse warning
      USB: musb: omap2430: fix sparse warning
      USB: core: message: fix sparse warning
      USB: core: hub: fix sparse warning
      USB: core: fix sparse warning for static function
      USB: Added USB_ETH_RNDIS to use instead of CONFIG_USB_ETH_RNDIS
      USB: Check bandwidth when switching alt settings.
      USB: Refactor code to find alternate interface settings.
      USB: xhci: Fix command completion after a drop endpoint.
      USB: xhci: Make reverting an alt setting "unfailable".
      USB: usbtmc: Use usb_clear_halt() instead of custom code.
      USB: xhci: Add correct email and files to MAINTAINERS entry.
      USB: ehci-omap.c: introduce missing kfree
      USB: xhci-mem.c: introduce missing kfree
      USB: add remove_id sysfs attr for usb drivers
      USB: g_multi kconfig: fix depends and help text
      USB: option: add pid for ZTE
      ...
  9. Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel…

    torvalds committed Dec 11, 2009
    …/git/ieee1394/linux1394-2.6
    
    * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394-2.6:
      firewire: ohci: handle receive packets with a data length of zero
  10. Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel…

    torvalds committed Dec 11, 2009
    …/git/jwessel/linux-2.6-kgdb
    
    * 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jwessel/linux-2.6-kgdb:
      kgdb: Always process the whole breakpoint list on activate or deactivate
      kgdb: continue and warn on signal passing from gdb
      kgdb,x86: do not set kgdb_single_step on x86
      kgdb: allow for cpu switch when single stepping
      kgdb,i386: Fix corner case access to ss with NMI watch dog exception
      kgdb: Replace strstr() by strchr() for single-character needles
      kgdbts: Read buffer overflow
      kgdb: Read buffer overflow
      kgdb,x86: remove redundant test
  11. tty: split the lock up a bit further

    Alan Cox committed with gregkh Nov 30, 2009
    The tty count sanity check may need the BKL, that isn't clear. However it
    is clear that the count use of the lock is internal and independant of the
    bigger use of the lock.
    
    Furthermore the file list locking is also separately locked already
    
    Signed-off-by: Alan Cox <alan@linux.intel.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
  12. tty: Move the leader test in disassociate

    Alan Cox committed with gregkh Nov 30, 2009
    There are two call points, both want to check that tty->signal->leader is
    set. Move the test into disassociate_ctty() as that will make locking
    changes easier in a bit
    
    Signed-off-by: Alan Cox <alan@linux.intel.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
  13. tty: Push the bkl down a bit in the hangup code

    Alan Cox committed with gregkh Nov 30, 2009
    We know that the redirect field is handled via its own locking in all
    places
    
    Signed-off-by: Alan Cox <alan@linux.intel.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
  14. tty: Push the lock down further into the ldisc code

    Alan Cox committed with gregkh Nov 30, 2009
    Signed-off-by: Alan Cox <alan@linux.intel.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
  15. tty: push the BKL down into the handlers a bit

    Alan Cox committed with gregkh Nov 30, 2009
    Start trying to untangle the remaining BKL mess
    
    Updated to fix missing unlock_kernel noted by Dan Carpenter
    
    Signed-off-by: Alan "I must be out of my tree" Cox <alan@linux.intel.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
  16. tty: moxa: split open lock

    Alan Cox committed with gregkh Nov 30, 2009
    moxa_openlock is used for several situations where we want to handle the
    case of an ioctl that crosses many ports (not just the open tty), and also
    cases where an open races a deinit (eg a pci unplug) and we hangup a port
    before we can cope with that.
    
    The non open race cases can use the moxa_lock spinlock. This simplifies sorting
    out the remaining mess.
    
    Signed-off-by: Alan Cox <alan@linux.intel.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
  17. tty: moxa: Kill the use of lock_kernel

    Alan Cox committed with gregkh Nov 30, 2009
    It isn't needed here any more
    
    Signed-off-by: Alan Cox <alan@linux.intel.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
  18. tty: moxa: Fix modem op locking

    Alan Cox committed with gregkh Nov 30, 2009
    This is overkill and mostly not needed
    
    Signed-off-by: Alan Cox <alan@linux.intel.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
  19. tty: moxa: Kill off the throttle method

    Alan Cox committed with gregkh Nov 30, 2009
    The tty flag can be tested so the shadow flag isn't needed
    
    Signed-off-by: Alan Cox <alan@linux.intel.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
  20. tty: moxa: Locking clean up

    Alan Cox committed with gregkh Nov 30, 2009
    - The open lock is needed to fix up the case of a board reset occuring during
      tty open but too early for a sane hangup response.
    - The lock can however got for other cases
    - Use the port mutex for get/setserial
    - Fix up the confused lack of locking on the THROTTLE and other bits in the
      private flags. Just use set/test/clear bit and it covers the cases we need
    
    Signed-off-by: Alan Cox <alan@linux.intel.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
  21. tty: moxa: rework the locking a bit

    Alan Cox committed with gregkh Nov 30, 2009
    Introduce a lock for moxafunc() to protect the cases where were get collisions
    between two function requests at the same time.
    
    Signed-off-by: Alan Cox <alan@linux.intel.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
  22. tty: moxa: Use more tty_port ops

    Alan Cox committed with gregkh Nov 30, 2009
    Rework a few bits of this into tty_port format
    
    Signed-off-by: Alan Cox <alan@linux.intel.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
  23. tty: isicom: fix deadlock on shutdown

    Alan Cox committed with gregkh Nov 30, 2009
    Alexander Strakh <strakh@ispras.ru> reported
    
    	KERNEL_VERSION: 2.6.31
    	DESCRIBE:
    Driver drivers/char/isicom.c might sleep in atomic  context, because it
    calls 
    tty_port_xmit_buf under spin_lock.
    
    ./drivers/char/isicom.c:
    1307 static void isicom_hangup(struct tty_struct *tty)
    1308 {
    ...
    1315         spin_lock_irqsave(&port->card->card_lock, flags);
    1316         isicom_shutdown_port(port);
    ...
    
    Path to might_sleep macro from isicom_hangup:
    1. isicom_hangup calls spin_lock_irqsave (drivers/char/isicom.c:1315) and
    then 
    calls isicom_shutdown_port.
    2. isiscom_shutdown_port calls tty_port_free_xmit_buf at 
    drivers/char/isicom.c:906
    3. tty_port_free_xmit_buf calls mutex_lock at drivers/char/tty_port:48
    
    Found by Linux Driver Verification Project.
    
    Reported-by: Alexander Strakh <strakh@ispras.ru>
    Signed-off-by: Alan Cox <alan@linux.intel.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
  24. tty: mxser: Use the new locking rules to fix setserial properly

    Alan Cox committed with gregkh Nov 30, 2009
    Propogate the init/shutdown mutex through the setserial logic. Use the proper
    locks for the various bits still using the BKL. Kill the BKL in this driver.
    
    Updated to fix the bug noted by Dan Carpenter
    
    Signed-off-by: Alan Cox <alan@linux.intel.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
  25. tty: mxser: use the tty_port_open method

    Alan Cox committed with gregkh Nov 30, 2009
    At first this looks a fairly trivial conversion but we can't quite push
    everything into the right format yet. The open side is easy but care is needed
    over the setserial methods. Fix up the locking now that we've adopted the
    port->mutex locking rule for the initialization.
    
    Signed-off-by: Alan Cox <alan@linux.intel.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>