1. 06 2月, 2014 8 次提交
  2. 04 2月, 2014 5 次提交
    • R
      ACPI / hotplug / PCI: Fix bridge removal race vs dock events · af9d8adc
      Rafael J. Wysocki 提交于
      If a PCI bridge with an ACPIPHP context attached is removed via
      sysfs, the code path executed as a result is the following:
      
      pci_stop_and_remove_bus_device_locked
       pci_remove_bus
        pcibios_remove_bus
         acpi_pci_remove_bus
          acpiphp_remove_slots
           cleanup_bridge
            unregister_hotplug_dock_device (drops dock references to the bridge)
           put_bridge
            free_bridge
             acpiphp_put_context (for each child, under context lock)
              kfree (context)
      
      Now, if a dock event affecting one of the bridge's child devices
      occurs (roughly at the same time), it will lead to the following code
      path:
      
      acpi_dock_deferred_cb
       dock_notify
        handle_eject_request
         hot_remove_dock_devices
          dock_hotplug_event
           hotplug_event (dereferences context)
      
      That may lead to a kernel crash in hotplug_event() if it is executed
      after the last kfree() in the bridge removal code path.
      
      To prevent that from happening, add a wrapper around hotplug_event()
      called dock_event() and point the .handler pointer in acpiphp_dock_ops
      to it.  Make that wrapper retrieve the device's ACPIPHP context using
      acpiphp_get_context() (instead of taking it from the data argument)
      under acpiphp_context_lock and check if the parent bridge's
      is_going_away flag is set.  If that flag is set, it will return
      immediately and if it is not set it will grab a reference to the
      device's parent bridge before executing hotplug_event().
      
      Then, in the above scenario, the reference to the parent bridge
      held by dock_event() will prevent free_bridge() from being executed
      for it until hotplug_event() returns.
      Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>
      af9d8adc
    • R
      ACPI / hotplug / PCI: Fix bridge removal race in handle_hotplug_event() · 1b360f44
      Rafael J. Wysocki 提交于
      If a PCI bridge with an ACPIPHP context attached is removed via
      sysfs, the code path executed as a result is the following:
      
      pci_stop_and_remove_bus_device_locked
       pci_remove_bus
        pcibios_remove_bus
         acpi_pci_remove_bus
          acpiphp_remove_slots
           cleanup_bridge
           put_bridge
            free_bridge
             acpiphp_put_context (for each child, under context lock)
              kfree (child context)
      
      Now, if a hotplug notify is dispatched for one of the bridge's
      children and the timing is such that handle_hotplug_event() for
      that notify is executed while free_bridge() above is running,
      the get_bridge(context->func.parent) in handle_hotplug_event()
      will not really help, because it is too late to prevent the bridge
      from going away and the child's context may be freed before
      hotplug_event_work() scheduled from handle_hotplug_event()
      dereferences the pointer to it passed via the data argument.
      That will cause a kernel crash to happpen in hotplug_event_work().
      
      To prevent that from happening, make handle_hotplug_event()
      check the is_going_away flag of the function's parent bridge
      (under acpiphp_context_lock) and bail out if it's set.  Also,
      make cleanup_bridge() set the bridge's is_going_away flag under
      acpiphp_context_lock so that it cannot be changed between the
      check and the subsequent get_bridge(context->func.parent) in
      handle_hotplug_event().
      
      Then, in the above scenario, handle_hotplug_event() will notice
      that context->func.parent->is_going_away is already set and it
      will exit immediately preventing the crash from happening.
      Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>
      1b360f44
    • R
      ACPI / hotplug / PCI: Scan root bus under the PCI rescan-remove lock · d42f5da2
      Rafael J. Wysocki 提交于
      Since acpiphp_check_bridge() called by acpiphp_check_host_bridge()
      does things that require PCI rescan-remove locking around it,
      make acpiphp_check_host_bridge() use that locking.
      Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>
      Tested-by: NMika Westerberg <mika.westerberg@linux.intel.com>
      d42f5da2
    • R
      ACPI / hotplug / PCI: Move PCI rescan-remove locking to hotplug_event() · f41b3261
      Rafael J. Wysocki 提交于
      Commit 9217a984 (ACPI / hotplug / PCI: Use global PCI rescan-remove
      locking) modified ACPIPHP to protect its PCI device removal and addition
      code paths from races against sysfs-driven rescan and remove operations
      with the help of PCI rescan-remove locking.  However, it overlooked the
      fact that hotplug_event_work() is not the only caller of hotplug_event()
      which may also be called by dock_hotplug_event() and that code path
      is missing the PCI rescan-remove locking.  This means that, although
      the PCI rescan-remove lock is held as appropriate during the handling
      of events originating from handle_hotplug_event(), the ACPIPHP's
      operations resulting from dock events may still suffer the race
      conditions that commit 9217a984 was supposed to eliminate.
      
      To address that problem, move the PCI rescan-remove locking from
      hotplug_event_work() to hotplug_event() so that it is used regardless
      of the way that function is invoked.
      
      Revamps: 9217a984 (ACPI / hotplug / PCI: Use global PCI rescan-remove locking)
      Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>
      Tested-by: NMika Westerberg <mika.westerberg@linux.intel.com>
      f41b3261
    • R
      ACPI / hotplug / PCI: Remove entries from bus->devices in reverse order · 2d7c1b77
      Rafael J. Wysocki 提交于
      According to the changelog of commit 29ed1f29 (PCI: pciehp: Fix null
      pointer deref when hot-removing SR-IOV device) it is unsafe to walk the
      bus->devices list of a PCI bus and remove devices from it in direct order,
      because that may lead to NULL pointer dereferences related to virtual
      functions.
      
      For this reason, change all of the bus->devices list walks in
      acpiphp_glue.c during which devices may be removed to be carried out in
      reverse order.
      Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>
      Tested-by: NMika Westerberg <mika.westerberg@linux.intel.com>
      2d7c1b77
  3. 03 2月, 2014 16 次提交
    • L
      Linus 3.14-rc1 · 38dbfb59
      Linus Torvalds 提交于
      38dbfb59
    • L
      Merge branch 'parisc-3.14' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux · 69048e01
      Linus Torvalds 提交于
      Pull parisc updates from Helge Deller:
       "The three major changes in this patchset is a implementation for
        flexible userspace memory maps, cache-flushing fixes (again), and a
        long-discussed ABI change to make EWOULDBLOCK the same value as
        EAGAIN.
      
        parisc has been the only platform where we had EWOULDBLOCK != EAGAIN
        to keep HP-UX compatibility.  Since we will probably never implement
        full HP-UX support, we prefer to drop this compatibility to make it
        easier for us with Linux userspace programs which mostly never checked
        for both values.  We don't expect major fall-outs because of this
        change, and if we face some, we will simply rebuild the necessary
        applications in the debian archives"
      
      * 'parisc-3.14' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux:
        parisc: add flexible mmap memory layout support
        parisc: Make EWOULDBLOCK be equal to EAGAIN on parisc
        parisc: convert uapi/asm/stat.h to use native types only
        parisc: wire up sched_setattr and sched_getattr
        parisc: fix cache-flushing
        parisc/sti_console: prefer Linux fonts over built-in ROM fonts
      69048e01
    • M
      hpfs: optimize quad buffer loading · 1c0b8a7a
      Mikulas Patocka 提交于
      HPFS needs to load 4 consecutive 512-byte sectors when accessing the
      directory nodes or bitmaps.  We can't switch to 2048-byte block size
      because files are allocated in the units of 512-byte sectors.
      
      Previously, the driver would allocate a 2048-byte area using kmalloc,
      copy the data from four buffers to this area and eventually copy them
      back if they were modified.
      
      In the current implementation of the buffer cache, buffers are allocated
      in the pagecache.  That means that 4 consecutive 512-byte buffers are
      stored in consecutive areas in the kernel address space.  So, we don't
      need to allocate extra memory and copy the content of the buffers there.
      
      This patch optimizes the code to avoid copying the buffers.  It checks
      if the four buffers are stored in contiguous memory - if they are not,
      it falls back to allocating a 2048-byte area and copying data there.
      Signed-off-by: NMikulas Patocka <mikulas@artax.karlin.mff.cuni.cz>
      Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      1c0b8a7a
    • M
      hpfs: remember free space · 2cbe5c76
      Mikulas Patocka 提交于
      Previously, hpfs scanned all bitmaps each time the user asked for free
      space using statfs.  This patch changes it so that hpfs scans the
      bitmaps only once, remembes the free space and on next invocation of
      statfs it returns the value instantly.
      
      New versions of wine are hammering on the statfs syscall very heavily,
      making some games unplayable when they're stored on hpfs, with load
      times in minutes.
      
      This should be backported to the stable kernels because it fixes
      user-visible problem (excessive level load times in wine).
      Signed-off-by: NMikulas Patocka <mikulas@artax.karlin.mff.cuni.cz>
      Cc: stable@vger.kernel.org
      Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      2cbe5c76
    • H
      parisc: add flexible mmap memory layout support · 9dabf60d
      Helge Deller 提交于
      Add support for the flexible mmap memory layout (as described in
      http://lwn.net/Articles/91829). This is especially very interesting on
      parisc since we currently only support 32bit userspace (even with a
      64bit Linux kernel).
      Signed-off-by: NHelge Deller <deller@gmx.de>
      9dabf60d
    • G
      parisc: Make EWOULDBLOCK be equal to EAGAIN on parisc · f5a408d5
      Guy Martin 提交于
      On Linux, only parisc uses a different value for EWOULDBLOCK which
      causes a lot of troubles for applications not checking for both values.
      Since the hpux compat is long dead, make EWOULDBLOCK behave the same as
      all other architectures.
      Signed-off-by: NGuy Martin <gmsoft@tuxicoman.be>
      Signed-off-by: NHelge Deller <deller@gmx.de>
      f5a408d5
    • H
      parisc: convert uapi/asm/stat.h to use native types only · 9391bc77
      Helge Deller 提交于
      The stat.h header file is exported to userspace. Some userspace
      applications failed to compile due to missing/unknown types, so we
      better convert it to use native types only (like it's done on other
      architectures too).
      Signed-off-by: NHelge Deller <deller@gmx.de>
      9391bc77
    • H
      parisc: wire up sched_setattr and sched_getattr · 998bbb2f
      Helge Deller 提交于
      Signed-off-by: NHelge Deller <deller@gmx.de>
      998bbb2f
    • H
      parisc: fix cache-flushing · 57737c49
      Helge Deller 提交于
      This commit:
      f8dae006: parisc: Ensure full cache coherency for kmap/kunmap
      caused negative caching side-effects, e.g. hanging processes with expect and
      too many inequivalent alias messages from flush_dcache_page() on Debian 5 systems.
      
      This patch now partly reverts it and has been in production use on our debian buildd
      makeservers since a week without any major problems.
      Signed-off-by: NHelge Deller <deller@gmx.de>
      Signed-off-by: NJohn David Anglin <dave.anglin@bell.net>
      Cc: stable@vger.kernel.org # v3.9+
      Signed-off-by: NHelge Deller <deller@gmx.de>
      57737c49
    • H
      parisc/sti_console: prefer Linux fonts over built-in ROM fonts · 8a10bc9d
      Helge Deller 提交于
      The built-in ROM fonts lack many necessary ASCII characters, which is
      why it makes sens to prefer the Linux fonts instead if they are
      available.  This makes consoles on STI graphics cards which are not
      supported by the stifb driver (e.g. Visualize FXe) looks much nicer.
      Signed-off-by: NHelge Deller <deller@gmx.de>
      Cc: stable@vger.kernel.org # v3.13
      8a10bc9d
    • L
      Merge branch 'hwmon-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jdelvare/staging · 602456bf
      Linus Torvalds 提交于
      Pull hwmon kconfig fixes from Jean Delvare.
      
      * 'hwmon-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jdelvare/staging:
        hwmon: Fix SENSORS_TMP102 dependencies to eliminate build errors
        hwmon: Fix SENSORS_LM75 dependencies to eliminate build errors
      602456bf
    • L
      Merge branch 'slab/next' of git://git.kernel.org/pub/scm/linux/kernel/git/penberg/linux · 7b383bef
      Linus Torvalds 提交于
      Pull SLAB changes from Pekka Enberg:
       "Random bug fixes that have accumulated in my inbox over the past few
        months"
      
      * 'slab/next' of git://git.kernel.org/pub/scm/linux/kernel/git/penberg/linux:
        mm: Fix warning on make htmldocs caused by slab.c
        mm: slub: work around unneeded lockdep warning
        mm: sl[uo]b: fix misleading comments
        slub: Fix possible format string bug.
        slub: use lockdep_assert_held
        slub: Fix calculation of cpu slabs
        slab.h: remove duplicate kmalloc declaration and fix kernel-doc warnings
      7b383bef
    • L
      Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux · 87af5e5c
      Linus Torvalds 提交于
      Pull turbostat updates from Len Brown.
      
      * 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux:
        tools/power turbostat: introduce -s to dump counters
        tools/power turbostat: remove unused command line option
        turbostat: Add option to report joules consumed per sample
        turbostat: run on HSX
        turbostat: Add a .gitignore to ignore the compiled turbostat binary
        turbostat: Clean up error handling; disambiguate error messages; use err and errx
        turbostat: Factor out common function to open file and exit on failure
        turbostat: Add a helper to parse a single int out of a file
        turbostat: Check return value of fscanf
        turbostat: Use GCC's CPUID functions to support PIC
        turbostat: Don't attempt to printf an off_t with %zx
        turbostat: Don't put unprocessed uapi headers in the include path
      87af5e5c
    • L
      Merge tag 'fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc · e4c0da21
      Linus Torvalds 提交于
      Pull ARM SoC fixes from Olof Johansson:
       "Here's a set of patches for (hopefully) -rc1.  Some of them are fixes,
        but a good number of them also do things such as enable new drivers in
        the defconfigs for platforms that have such devices, increases
        coverage of the multiplatform defconfig and some DTS changes that
        plumbs up some of the devices that now have bindings and driver
        support.
      
        The commit dates are recent; we've mostly collected these fixes in the
        last few days but I also had to rebuild the branch yesterday to sort
        out some internal conflicts which reset the timestamps.  The changes
        should have been tested by each platform maintainer already (and few
        of them have cross-platform impact) so I'm personally not too
        concerned by it at this time"
      
      * tag 'fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (23 commits)
        ARM: multi_v7_defconfig: remove redundant entries and re-enable TI_EDMA
        ARM: multi_v7_defconfig: add mvebu drivers
        clocksource: kona: Add basic use of external clock
        drivers: bus: fix CCI driver kcalloc call parameters swap
        ARM: dts: bcm28155-ap: Fix Card Detection GPIO
        ARM: multi_v7_defconfig: Select CONFIG_AT803X_PHY
        ARM: keystone: config: fix build warning when CONFIG_DMADEVICES is not set
        MAINTAINERS: ARM: SiRF: use regex patterns to involve all SiRF drivers
        ARM: dts: zynq: Add SDHCI nodes
        ARM: hisi: don't select SMP
        ARM: tegra: rebuild tegra_defconfig to add DEBUG_FS
        ARM: multi_v7: copy most options from tegra_defconfig
        ARM: iop32x: fix power off handling for the EM7210 board
        ARM: integrator: restore static map on the CP
        ARM: msm_defconfig: Enable MSM clock drivers
        ARM: dts: msm: Add clock controller nodes and hook into uart
        ARM: OMAP4+: move errata initialization to omap4_pm_init_early
        ARM: OMAP4460: cpuidle: Extend PM_OMAP4_ROM_SMP_BOOT_ERRATUM_GICD on cpuidle
        ARM: mvebu: fix compilation warning on Armada 370 (i.e. non-SMP)
        ARM: shmobile: r8a7790.dtsi: ficx i2c[0-3] clock reference
        ...
      e4c0da21
    • J
      hwmon: Fix SENSORS_TMP102 dependencies to eliminate build errors · 632007e2
      Jean Delvare 提交于
      Similar to what was done for the lm75 driver.
      
      Add depends on THERMAL since that is what provides the
      register/unregister functions above, but only if THERMAL_OF was
      selected as this is an optional feature of the driver.
      Signed-off-by: NJean Delvare <khali@linux-fr.org>
      Cc: Randy Dunlap <rdunlap@infradead.org>
      Acked-by: NEduardo Valentin <eduardo.valentin@ti.com>
      Reviewed-by: NGuenter Roeck <linux@roeck-us.net>
      632007e2
    • J
      hwmon: Fix SENSORS_LM75 dependencies to eliminate build errors · 920130a9
      Jean Delvare 提交于
      Based on an earlier attempt by Randy Dunlap.
      
      Fix SENSORS_LM75 dependencies to eliminate build errors:
      
      drivers/built-in.o: In function `lm75_remove':
      lm75.c:(.text+0x12bd8c): undefined reference to `thermal_zone_of_sensor_unregister'
      drivers/built-in.o: In function `lm75_probe':
      lm75.c:(.text+0x12c123): undefined reference to `thermal_zone_of_sensor_register'
      
      Add depends on THERMAL since that is what provides the
      register/unregister functions above, but only if THERMAL_OF was
      selected as this is an optional feature of the driver.
      Signed-off-by: NJean Delvare <khali@linux-fr.org>
      Cc: Randy Dunlap <rdunlap@infradead.org>
      Acked-by: NEduardo Valentin <eduardo.valentin@ti.com>
      Reviewed-by: NGuenter Roeck <linux@roeck-us.net>
      920130a9
  4. 02 2月, 2014 9 次提交
  5. 01 2月, 2014 2 次提交