1. 08 May, 2009 1 commit
  2. 06 May, 2009 4 commits
  3. 05 May, 2009 1 commit
    • Steven Rostedt's avatar
      ring-buffer: add counters for commit overrun and nmi dropped entries · f0d2c681
      Steven Rostedt authored
      
      
      The WARN_ON in the ring buffer when a commit is preempted and the
      buffer is filled by preceding writes can happen in normal operations.
      The WARN_ON makes it look like a bug, not to mention, because
      it does not stop tracing and calls printk which can also recurse, this
      is prone to deadlock (the WARN_ON is not in a position to recurse).
      
      This patch removes the WARN_ON and replaces it with a counter that
      can be retrieved by a tracer. This counter is called commit_overrun.
      
      While at it, I added a nmi_dropped counter to count any time an NMI entry
      is dropped because the NMI could not take the spinlock.
      
      [ Impact: prevent deadlock by printing normal case warning ]
      Signed-off-by: default avatarSteven Rostedt <rostedt@goodmis.org>
      f0d2c681
  4. 04 May, 2009 3 commits
    • Marcel Holtmann's avatar
      Bluetooth: Fix issue with sysfs handling for connections · a67e899c
      Marcel Holtmann authored
      
      
      Due to a semantic changes in flush_workqueue() the current approach of
      synchronizing the sysfs handling for connections doesn't work anymore. The
      whole approach is actually fully broken and based on assumptions that are
      no longer valid.
      
      With the introduction of Simple Pairing support, the creation of low-level
      ACL links got changed. This change invalidates the reason why in the past
      two independent work queues have been used for adding/removing sysfs
      devices. The adding of the actual sysfs device is now postponed until the
      host controller successfully assigns an unique handle to that link. So
      the real synchronization happens inside the controller and not the host.
      
      The only left-over problem is that some internals of the sysfs device
      handling are not initialized ahead of time. This leaves potential access
      to invalid data and can cause various NULL pointer dereferences. To fix
      this a new function makes sure that all sysfs details are initialized
      when an connection attempt is made. The actual sysfs device is only
      registered when the connection has been successfully established. To
      avoid a race condition with the registration, the check if a device is
      registered has been moved into the removal work.
      
      As an extra protection two flush_work() calls are left in place to
      make sure a previous add/del work has been completed first.
      
      Based on a report by Marc Pignat <marc.pignat@hevs.ch>
      Signed-off-by: default avatarMarcel Holtmann <marcel@holtmann.org>
      Tested-by: default avatarJustin P. Mattock <justinmattock@gmail.com>
      Tested-by: default avatarRoger Quadros <ext-roger.quadros@nokia.com>
      Tested-by: default avatarMarc Pignat <marc.pignat@hevs.ch>
      a67e899c
    • Omar Laazimani's avatar
      usbnet: CDC EEM support (v5) · 9f722c09
      Omar Laazimani authored
      
      
      This introduces a CDC Ethernet Emulation Model (EEM) host side
      driver to support USB EEM devices.
      
      EEM is different from the Ethernet Control Model (ECM) currently
      supported by the "CDC Ethernet" driver.  One key difference is
      that it doesn't require of USB interface alternate settings to
      manage interface state; some maldesigned hardware can't handle
      that part of USB.  It also avoids a separate USB interface for
      control and status updates.
      
      [ dbrownell@users.sourceforge.net: fix skb leaks, add rx packet
      checks, improve fault handling, EEM conformance updates, cleanup ]
      Signed-off-by: default avatarOmar Laazimani <omar.oberthur@gmail.com>
      Signed-off-by: default avatarDavid Brownell <dbrownell@users.sourceforge.net>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      9f722c09
    • Satoru SATOH's avatar
      tcp: Fix tcp_prequeue() to get correct rto_min value · 0c266898
      Satoru SATOH authored
      
      
      tcp_prequeue() refers to the constant value (TCP_RTO_MIN) regardless of
      the actual value might be tuned. The following patches fix this and make
      tcp_prequeue get the actual value returns from tcp_rto_min().
      Signed-off-by: default avatarSatoru SATOH <satoru.satoh@gmail.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      0c266898
  5. 02 May, 2009 6 commits
  6. 01 May, 2009 3 commits
  7. 30 Apr, 2009 1 commit
  8. 29 Apr, 2009 4 commits
    • Tom Zanussi's avatar
      tracing/filters: a better event parser · 8b372562
      Tom Zanussi authored
      
      
      Replace the current event parser hack with a better one.  Filters are
      no longer specified predicate by predicate, but all at once and can
      use parens and any of the following operators:
      
      numeric fields:
      
      ==, !=, <, <=, >, >=
      
      string fields:
      
      ==, !=
      
      predicates can be combined with the logical operators:
      
      &&, ||
      
      examples:
      
      "common_preempt_count > 4" > filter
      
      "((sig >= 10 && sig < 15) || sig == 17) && comm != bash" > filter
      
      If there was an error, the erroneous string along with an error
      message can be seen by looking at the filter e.g.:
      
      ((sig >= 10 && sig < 15) || dsig == 17) && comm != bash
      ^
      parse_error: Field not found
      
      Currently the caret for an error always appears at the beginning of
      the filter; a real position should be used, but the error message
      should be useful even without it.
      
      To clear a filter, '0' can be written to the filter file.
      
      Filters can also be set or cleared for a complete subsystem by writing
      the same filter as would be written to an individual event to the
      filter file at the root of the subsytem.  Note however, that if any
      event in the subsystem lacks a field specified in the filter being
      set, the set will fail and all filters in the subsytem are
      automatically cleared.  This change from the previous version was made
      because using only the fields that happen to exist for a given event
      would most likely result in a meaningless filter.
      
      Because the logical operators are now implemented as predicates, the
      maximum number of predicates in a filter was increased from 8 to 16.
      
      [ Impact: add new, extended trace-filter implementation ]
      Signed-off-by: default avatarTom Zanussi <tzanussi@gmail.com>
      Acked-by: default avatarSteven Rostedt <rostedt@goodmis.org>
      Cc: fweisbec@gmail.com
      Cc: Li Zefan <lizf@cn.fujitsu.com>
      LKML-Reference: <1240905899.6416.121.camel@tropicana>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      8b372562
    • Tom Zanussi's avatar
      tracing/filters: distinguish between signed and unsigned fields · a118e4d1
      Tom Zanussi authored
      
      
      The new filter comparison ops need to be able to distinguish between
      signed and unsigned field types, so add an is_signed flag/param to the
      event field struct/trace_define_fields().  Also define a simple macro,
      is_signed_type() to determine the signedness at compile time, used in the
      trace macros.  If the is_signed_type() macro won't work with a specific
      type, a new slightly modified version of TRACE_FIELD() called
      TRACE_FIELD_SIGN(), allows the signedness to be set explicitly.
      
      [ Impact: extend trace-filter code for new feature ]
      Signed-off-by: default avatarTom Zanussi <tzanussi@gmail.com>
      Acked-by: default avatarSteven Rostedt <rostedt@goodmis.org>
      Cc: fweisbec@gmail.com
      Cc: Li Zefan <lizf@cn.fujitsu.com>
      LKML-Reference: <1240905893.6416.120.camel@tropicana>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      a118e4d1
    • Tom Zanussi's avatar
      tracing/filters: move preds into event_filter object · 30e673b2
      Tom Zanussi authored
      
      
      Create a new event_filter object, and move the pred-related members
      out of the call and subsystem objects and into the filter object - the
      details of the filter implementation don't need to be exposed in the
      call and subsystem in any case, and it will also help make the new
      parser implementation a little cleaner.
      
      [ Impact: refactor trace-filter code to prepare for new features ]
      Signed-off-by: default avatarTom Zanussi <tzanussi@gmail.com>
      Acked-by: default avatarSteven Rostedt <rostedt@goodmis.org>
      Cc: fweisbec@gmail.com
      Cc: Li Zefan <lizf@cn.fujitsu.com>
      LKML-Reference: <1240905887.6416.119.camel@tropicana>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      30e673b2
    • Stuart Bennett's avatar
      tracing: x86, mmiotrace: only register for die notifier when tracer active · 0f9a623d
      Stuart Bennett authored
      Follow up to afcfe024
      
       in Linus' tree
      ("x86: mmiotrace: quieten spurious warning message")
      Signed-off-by: default avatarStuart Bennett <stuart@freedesktop.org>
      Acked-by: default avatarPekka Paalanen <pq@iki.fi>
      Cc: Steven Rostedt <rostedt@goodmis.org>
      LKML-Reference: <1240946271-7083-5-git-send-email-stuart@freedesktop.org>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      0f9a623d
  9. 28 Apr, 2009 7 commits
    • Stephen Hemminger's avatar
      netfilter: revised locking for x_tables · 942e4a2b
      Stephen Hemminger authored
      
      
      The x_tables are organized with a table structure and a per-cpu copies
      of the counters and rules. On older kernels there was a reader/writer 
      lock per table which was a performance bottleneck. In 2.6.30-rc, this
      was converted to use RCU and the counters/rules which solved the performance
      problems for do_table but made replacing rules much slower because of
      the necessary RCU grace period.
      
      This version uses a per-cpu set of spinlocks and counters to allow to
      table processing to proceed without the cache thrashing of a global
      reader lock and keeps the same performance for table updates.
      Signed-off-by: default avatarStephen Hemminger <shemminger@vyatta.com>
      Acked-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      942e4a2b
    • Randy Dunlap's avatar
      regulator: fix header file missing kernel-doc · 9f653251
      Randy Dunlap authored
      
      
      Add regulator header file missing kernel-doc:
      
      Warning(include/linux/regulator/driver.h:117): No description found for parameter 'set_mode'
      Signed-off-by: default avatarRandy Dunlap <randy.dunlap@oracle.com>
      cc:	Liam Girdwood <lrg@slimlogic.co.uk>
      cc:	Mark Brown <broonie@opensource.wolfsonmicro.com>
      Signed-off-by: default avatarLiam Girdwood <lrg@slimlogic.co.uk>
      9f653251
    • Henrik Rydberg's avatar
      Input: add detailed multi-touch finger data report protocol · 5e5ee686
      Henrik Rydberg authored
      
      
      In order to utilize the full power of the new multi-touch devices, a
      way to report detailed finger data to user space is needed. This patch
      adds a multi-touch (MT) protocol which allows drivers to report details
      for an arbitrary number of fingers.
      
      The driver sends a SYN_MT_REPORT event via the input_mt_sync() function
      when a complete finger has been reported.
      
      In order to stay compatible with existing applications, the data
      reported in a finger packet must not be recognized as single-touch
      events. In addition, all finger data must bypass input filtering,
      since subsequent events of the same type refer to different fingers.
      
      A set of ABS_MT events with the desired properties are defined. The
      events are divided into categories, to allow for partial implementation.
      The minimum set consists of ABS_MT_TOUCH_MAJOR, ABS_MT_POSITION_X and
      ABS_MT_POSITION_Y, which allows for multiple fingers to be tracked.
      If the device supports it, the ABS_MT_WIDTH_MAJOR may be used to provide
      the size of the approaching finger. Anisotropy and direction may be
      specified with ABS_MT_TOUCH_MINOR, ABS_MT_WIDTH_MINOR and
      ABS_MT_ORIENTATION. Devices with more granular information may specify
      general shapes as blobs, i.e., as a sequence of rectangular shapes
      grouped together by a ABS_MT_BLOB_ID. Finally, the ABS_MT_TOOL_TYPE
      may be used to specify whether the touching tool is a finger or a pen.
      Signed-off-by: default avatarHenrik Rydberg <rydberg@euromail.se>
      Signed-off-by: default avatarDmitry Torokhov <dtor@mail.ru>
      5e5ee686
    • Henrik Rydberg's avatar
      Input: bcm5974 - add quad-finger tapping · 6916d97f
      Henrik Rydberg authored
      
      
      The integrated button on the new unibody Macbooks presents a need to
      report explicit four-finger actions. Evidently, the finger pressing
      the button is also touching the trackpad, so in order to fully support
      three-finger actions, the driver must be able to report four-finger
      actions. This patch adds a new button, BTN_TOOL_QUADTAP, which
      achieves this.
      Signed-off-by: default avatarHenrik Rydberg <rydberg@euromail.se>
      Signed-off-by: default avatarDmitry Torokhov <dtor@mail.ru>
      6916d97f
    • Marcel Holtmann's avatar
      Bluetooth: Add different pairing timeout for Legacy Pairing · 052b30b0
      Marcel Holtmann authored
      
      
      The Bluetooth stack uses a reference counting for all established ACL
      links and if no user (L2CAP connection) is present, the link will be
      terminated to save power. The problem part is the dedicated pairing
      when using Legacy Pairing (Bluetooth 2.0 and before). At that point
      no user is present and pairing attempts will be disconnected within
      10 seconds or less. In previous kernel version this was not a problem
      since the disconnect timeout wasn't triggered on incoming connections
      for the first time. However this caused issues with broken host stacks
      that kept the connections around after dedicated pairing. When the
      support for Simple Pairing got added, the link establishment procedure
      needed to be changed and now causes issues when using Legacy Pairing
      
      When using Simple Pairing it is possible to do a proper reference
      counting of ACL link users. With Legacy Pairing this is not possible
      since the specification is unclear in some areas and too many broken
      Bluetooth devices have already been deployed. So instead of trying to
      deal with all the broken devices, a special pairing timeout will be
      introduced that increases the timeout to 60 seconds when pairing is
      triggered.
      
      If a broken devices now puts the stack into an unforeseen state, the
      worst that happens is the disconnect timeout triggers after 120 seconds
      instead of 4 seconds. This allows successful pairings with legacy and
      broken devices now.
      
      Based on a report by Johan Hedberg <johan.hedberg@nokia.com>
      Signed-off-by: default avatarMarcel Holtmann <marcel@holtmann.org>
      052b30b0
    • Roger Quadros's avatar
      Bluetooth: Ensure that HCI sysfs add/del is preempt safe · f3784d83
      Roger Quadros authored
      
      
      Use a different work_struct variables for add_conn() and del_conn() and
      use single work queue instead of two for adding and deleting connections.
      
      It eliminates the following error on a preemptible kernel:
      
      [  204.358032] Unable to handle kernel NULL pointer dereference at virtual address 0000000c
      [  204.370697] pgd = c0004000
      [  204.373443] [0000000c] *pgd=00000000
      [  204.378601] Internal error: Oops: 17 [#1] PREEMPT
      [  204.383361] Modules linked in: vfat fat rfcomm sco l2cap sd_mod scsi_mod iphb pvr2d drm omaplfb ps
      [  204.438537] CPU: 0    Not tainted  (2.6.28-maemo2 #1)
      [  204.443664] PC is at klist_put+0x2c/0xb4
      [  204.447601] LR is at klist_put+0x18/0xb4
      [  204.451568] pc : [<c0270f08>]    lr : [<c0270ef4>]    psr: a0000113
      [  204.451568] sp : cf1b3f10  ip : cf1b3f10  fp : cf1b3f2c
      [  204.463104] r10: 00000000  r9 : 00000000  r8 : bf08029c
      [  204.468353] r7 : c7869200  r6 : cfbe2690  r5 : c78692c8  r4 : 00000001
      [  204.474945] r3 : 00000001  r2 : cf1b2000  r1 : 00000001  r0 : 00000000
      [  204.481506] Flags: NzCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM Segment kernel
      [  204.488861] Control: 10c5387d  Table: 887fc018  DAC: 00000017
      [  204.494628] Process btdelconn (pid: 515, stack limit = 0xcf1b22e0)
      Signed-off-by: default avatarRoger Quadros <ext-roger.quadros@nokia.com>
      Signed-off-by: default avatarMarcel Holtmann <marcel@holtmann.org>
      f3784d83
    • Eric Dumazet's avatar
      net: Avoid extra wakeups of threads blocked in wait_for_packet() · bf368e4e
      Eric Dumazet authored
      In 2.6.25 we added UDP mem accounting.
      
      This unfortunatly added a penalty when a frame is transmitted, since
      we have at TX completion time to call sock_wfree() to perform necessary
      memory accounting. This calls sock_def_write_space() and utimately
      scheduler if any thread is waiting on the socket.
      Thread(s) waiting for an incoming frame was scheduled, then had to sleep
      again as event was meaningless.
      
      (All threads waiting on a socket are using same sk_sleep anchor)
      
      This adds lot of extra wakeups and increases latencies, as noted
      by Christoph Lameter, and slows down softirq handler.
      
      Reference : http://marc.info/?l=linux-netdev&m=124060437012283&w=2 
      
      Fortunatly, Davide Libenzi recently added concept of keyed wakeups
      into kernel, and particularly for sockets (see commit
      37e5540b
      
       
      epoll keyed wakeups: make sockets use keyed wakeups)
      
      Davide goal was to optimize epoll, but this new wakeup infrastructure
      can help non epoll users as well, if they care to setup an appropriate
      handler.
      
      This patch introduces new DEFINE_WAIT_FUNC() helper and uses it
      in wait_for_packet(), so that only relevant event can wakeup a thread
      blocked in this function.
      
      Trace of function calls from bnx2 TX completion bnx2_poll_work() is :
      __kfree_skb()
       skb_release_head_state()
        sock_wfree()
         sock_def_write_space()
          __wake_up_sync_key()
           __wake_up_common()
            receiver_wake_function() : Stops here since thread is waiting for an INPUT
      Reported-by: default avatarChristoph Lameter <cl@linux.com>
      Signed-off-by: default avatarEric Dumazet <dada1@cosmosbay.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      bf368e4e
  10. 27 Apr, 2009 9 commits
  11. 26 Apr, 2009 1 commit
    • Tim Abbott's avatar
      Add new HEAD_TEXT_SECTION macro. · c80d471a
      Tim Abbott authored
      
      
      This patch is preparation for replacing all uses of ".head.text" or
      ".text.head" in the kernel with macros, so that the section name can
      later be changed without having to touch a lot of the kernel.
      
      Since some linker scripts do more complex things than referencing
      HEAD_TEXT, we add a HEAD_TEXT_SECTION macro that just contains the
      actual name.
      
      I've defined HEAD_TEXT_SECTION in a new header,
      include/linux/section-names.h, so that this section name only needs to
      appear in one place.  I anticipate creating similar macro structures
      for a number of other section names.
      
      The long-term goal here is to be able to change the kernel's magic
      section names to those that are compatible with -ffunction-sections
      -fdata-sections.  This requires renaming all magic sections with names
      of the form ".text.foo".
      Signed-off-by: default avatarTim Abbott <tabbott@mit.edu>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      c80d471a