• Tejun Heo's avatar
    workqueue: use mod_delayed_work() instead of cancel + queue · 41f63c53
    Tejun Heo authored
    
    
    Convert delayed_work users doing cancel_delayed_work() followed by
    queue_delayed_work() to mod_delayed_work().
    
    Most conversions are straight-forward.  Ones worth mentioning are,
    
    * drivers/edac/edac_mc.c: edac_mc_workq_setup() converted to always
      use mod_delayed_work() and cancel loop in
      edac_mc_reset_delay_period() is dropped.
    
    * drivers/platform/x86/thinkpad_acpi.c: No need to remember whether
      watchdog is active or not.  @fan_watchdog_active and related code
      dropped.
    
    * drivers/power/charger-manager.c: Seemingly a lot of
      delayed_work_pending() abuse going on here.
      [delayed_]work_pending() are unsynchronized and racy when used like
      this.  I converted one instance in fullbatt_handler().  Please
      conver the rest so that it invokes workqueue APIs for the intended
      target state rather than trying to game work item pending state
      transitions.  e.g. if timer should be modified - call
      mod_delayed_work(), canceled - call cancel_delayed_work[_sync]().
    
    * drivers/thermal/thermal_sys.c: thermal_zone_device_set_polling()
      simplified.  Note that round_jiffies() calls in this function are
      meaningless.  round_jiffies() work on absolute jiffies not delta
      delay used by delayed_work.
    
    v2: Tomi pointed out that __cancel_delayed_work() users can't be
        safely converted to mod_delayed_work().  They could be calling it
        from irq context and if that happens while delayed_work_timer_fn()
        is running, it could deadlock.  __cancel_delayed_work() users are
        dropped.
    Signed-off-by: default avatarTejun Heo <tj@kernel.org>
    Acked-by: default avatarHenrique de Moraes Holschuh <hmh@hmh.eng.br>
    Acked-by: default avatarDmitry Torokhov <dmitry.torokhov@gmail.com>
    Acked-by: default avatarAnton Vorontsov <cbouatmailru@gmail.com>
    Acked-by: default avatarDavid Howells <dhowells@redhat.com>
    Cc: Tomi Valkeinen <tomi.valkeinen@ti.com>
    Cc: Jens Axboe <axboe@kernel.dk>
    Cc: Jiri Kosina <jkosina@suse.cz>
    Cc: Doug Thompson <dougthompson@xmission.com>
    Cc: David Airlie <airlied@linux.ie>
    Cc: Roland Dreier <roland@kernel.org>
    Cc: "John W. Linville" <linville@tuxdriver.com>
    Cc: Zhang Rui <rui.zhang@intel.com>
    Cc: Len Brown <len.brown@intel.com>
    Cc: "J. Bruce Fields" <bfields@fieldses.org>
    Cc: Johannes Berg <johannes@sipsolutions.net>
    41f63c53
addr.c 11.1 KB