1. 09 Nov, 2013 7 commits
  2. 05 Nov, 2013 2 commits
    • Joe Thornber's avatar
      dm array: fix bug in growing array · 9c1d4de5
      Joe Thornber authored
      Entries would be lost if the old tail block was partially filled.
      Signed-off-by: default avatarJoe Thornber <ejt@redhat.com>
      Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
      Cc: stable@vger.kernel.org # 3.9+
      9c1d4de5
    • Hannes Reinecke's avatar
      dm mpath: requeue I/O during pg_init · b63349a7
      Hannes Reinecke authored
      When pg_init is running no I/O can be submitted to the underlying
      devices, as the path priority etc might change.  When using queue_io for
      this, requests will be piling up within multipath as the block I/O
      scheduler just sees a _very fast_ device.  All of this queued I/O has to
      be resubmitted from within multipathing once pg_init is done.
      
      This approach has the problem that it's virtually impossible to
      abort I/O when pg_init is running, and we're adding heavy load
      to the devices after pg_init since all of the queued I/O needs to be
      resubmitted _before_ any requests can be pulled off of the request queue
      and normal operation continues.
      
      This patch will requeue the I/O that triggers the pg_init call, and
      return 'busy' when pg_init is in progress.  With these changes the block
      I/O scheduler will stop submitting I/O during pg_init, resulting in a
      quicker path switch and less I/O pressure (and memory consumption) after
      pg_init.
      Signed-off-by: default avatarHannes Reinecke <hare@suse.de>
      [patch header edited for clarity and typos by Mike Snitzer]
      Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
      b63349a7
  3. 01 Nov, 2013 1 commit
    • Shiva Krishna Merla's avatar
      dm mpath: fix race condition between multipath_dtr and pg_init_done · 954a73d5
      Shiva Krishna Merla authored
      Whenever multipath_dtr() is happening we must prevent queueing any
      further path activation work.  Implement this by adding a new
      'pg_init_disabled' flag to the multipath structure that denotes future
      path activation work should be skipped if it is set.  By disabling
      pg_init and then re-enabling in flush_multipath_work() we also avoid the
      potential for pg_init to be initiated while suspending an mpath device.
      
      Without this patch a race condition exists that may result in a kernel
      panic:
      
      1) If after pg_init_done() decrements pg_init_in_progress to 0, a call
         to wait_for_pg_init_completion() assumes there are no more pending path
         management commands.
      2) If pg_init_required is set by pg_init_done(), due to retryable
         mode_select errors, then process_queued_ios() will again queue the
         path activation work.
      3) If free_multipath() completes before activate_path() work is called a
         NULL pointer dereference like the following can be seen when
         accessing members of the recently destructed multipath:
      
      BUG: unable to handle kernel NULL pointer dereference at 0000000000000090
      RIP: 0010:[<ffffffffa003db1b>]  [<ffffffffa003db1b>] activate_path+0x1b/0x30 [dm_multipath]
      [<ffffffff81090ac0>] worker_thread+0x170/0x2a0
      [<ffffffff81096c80>] ? autoremove_wake_function+0x0/0x40
      
      [switch to disabling pg_init in flush_multipath_work & header edits by Mike Snitzer]
      Signed-off-by: default avatarShiva Krishna Merla <shivakrishna.merla@netapp.com>
      Reviewed-by: default avatarKrishnasamy Somasundaram <somasundaram.krishnasamy@netapp.com>
      Tested-by: default avatarSpeagle Andy <Andy.Speagle@netapp.com>
      Acked-by: default avatarJunichi Nomura <j-nomura@ce.jp.nec.com>
      Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
      Cc: stable@vger.kernel.org
      954a73d5
  4. 31 Oct, 2013 1 commit
  5. 13 Oct, 2013 17 commits
  6. 12 Oct, 2013 10 commits
  7. 11 Oct, 2013 2 commits
    • Linus Torvalds's avatar
      Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus · 46f37519
      Linus Torvalds authored
      Pull MIPS fix from Ralf Baechle:
       "Just one fix.  The stack protector was loading the value of the canary
        instead of its address"
      
      * 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus:
        MIPS: stack protector: Fix per-task canary switch
      46f37519
    • Linus Torvalds's avatar
      Merge branch 'drm-fixes' of git://people.freedesktop.org/~airlied/linux · cd4edf7a
      Linus Torvalds authored
      Pull drm fixes from Dave Airlie:
       "All over the map..
      
         - nouveau:
           disable MSI, needs more work, will try again next merge window
         - radeon:
            audio + uvd regression fixes, dpm fixes, reset fixes
         - i915:
           the dpms fix might fix your haswell
      
        And one pain in the ass revert, so we have VGA arbitration that when
        implemented 4-5 years ago really hoped that GPUs could remove
        themselves from arbitration completely once they had a kernel driver.
      
        It seems Intel hw designers decided that was too nice a facility to
        allow us to have so they removed it when they went on-die (so since
        Ironlake at least).  Now Alex Williamson added support for VGA
        arbitration for newer GPUs however this now exposes itself to
        userspace as requireing arbitration of GPU VGA regions and the X
        server gets involved and disables things that it can't handle when VGA
        access is possibly required around every operation.
      
        So in order to not break userspace we just reverted things back to the
        old known broken status so maybe we can try and design out way out.
      
        Ville also had a patch to use stop machine for the two times Intel
        needs to access VGA space, that might be acceptable with some rework,
        but for now myself and Daniel agreed to just go back"
      
      * 'drm-fixes' of git://people.freedesktop.org/~airlied/linux: (23 commits)
        Revert "i915: Update VGA arbiter support for newer devices"
        Revert "drm/i915: Delay disabling of VGA memory until vgacon->fbcon handoff is done"
        drm/radeon: re-enable sw ACR support on pre-DCE4
        drm/radeon/dpm: disable bapm on TN asics
        drm/radeon: improve soft reset on CIK
        drm/radeon: improve soft reset on SI
        drm/radeon/dpm: off by one in si_set_mc_special_registers()
        drm/radeon/dpm/btc: off by one in btc_set_mc_special_registers()
        drm/radeon: forever loop on error in radeon_do_test_moves()
        drm/radeon: fix hw contexts for SUMO2 asics
        drm/radeon: fix typo in CP DMA register headers
        drm/radeon/dpm: disable multiple UVD states
        drm/radeon: use hw generated CTS/N values for audio
        drm/radeon: fix N/CTS clock matching for audio
        drm/radeon: use 64-bit math to calculate CTS values for audio (v2)
        drm/edid: catch kmalloc failure in drm_edid_to_speaker_allocation
        Revert "drm/fb-helper: don't sleep for screen unblank when an oops is in progress"
        drm/gma500: fix things after get/put page helpers
        drm/nouveau/mc: disable msi support by default, it's busted in tons of places
        drm/i915: Only apply DPMS to the encoder if enabled
        ...
      cd4edf7a