[PATCH 14/15] workqueue: use mod_delayed_work() instead of cancel + queue

[Tejun Heo <tj@xxxxxxxxxx>]

Convert delayed_work users doing [__]cancel_delayed_work() +
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.

* net/core/link_watch.c: linkwatch_schedule_work() was doing a quite
  elaborate dancing around its delayed_work.  Collapse it such that
  linkwatch_work is queued for immediate execution if LW_URGENT and
  existing timer is kept otherwise.

Signed-off-by: Tejun Heo <tj@xxxxxxxxxx>
Cc: Jens Axboe <axboe@xxxxxxxxx>
Cc: Jiri Kosina <jkosina@xxxxxxx>
Cc: Doug Thompson <dougthompson@xxxxxxxxxxxx>
Cc: David Airlie <airlied@xxxxxxxx>
Cc: Roland Dreier <roland@xxxxxxxxxx>
Cc: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
Cc: "John W. Linville" <linville@xxxxxxxxxxxxx>
Cc: Henrique de Moraes Holschuh <ibm-acpi@xxxxxxxxxx>
Cc: Anton Vorontsov <cbou@xxxxxxx>
Cc: Zhang Rui <rui.zhang@xxxxxxxxx>
Cc: Len Brown <len.brown@xxxxxxxxx>
Cc: David Howells <dhowells@xxxxxxxxxx>
Cc: "J. Bruce Fields" <bfields@xxxxxxxxxxxx>
Cc: "David S. Miller" <davem@xxxxxxxxxxxxx>
Cc: Johannes Berg <johannes@xxxxxxxxxxxxxxxx>
---
 block/blk-core.c                       |    6 ++----
 block/blk-throttle.c                   |    7 +------
 block/genhd.c                          |    6 ++----
 drivers/block/floppy.c                 |    3 +--
 drivers/edac/edac_mc.c                 |   17 +----------------
 drivers/infiniband/core/addr.c         |    4 +---
 drivers/infiniband/core/mad.c          |   14 +++++---------
 drivers/infiniband/hw/nes/nes_hw.c     |    6 ++----
 drivers/infiniband/hw/nes/nes_nic.c    |    5 ++---
 drivers/input/keyboard/qt2160.c        |    3 +--
 drivers/input/mouse/synaptics_i2c.c    |    7 +------
 drivers/net/wireless/ipw2x00/ipw2100.c |    8 +++-----
 drivers/net/wireless/zd1211rw/zd_usb.c |    3 +--
 drivers/platform/x86/thinkpad_acpi.c   |   20 +++++---------------
 drivers/power/charger-manager.c        |    9 +++------
 drivers/power/ds2760_battery.c         |    9 +++------
 drivers/power/jz4740-battery.c         |    6 ++----
 drivers/thermal/thermal_sys.c          |   15 ++++++---------
 fs/afs/callback.c                      |    4 +---
 fs/afs/server.c                        |   10 ++--------
 fs/afs/vlocation.c                     |   14 +++-----------
 fs/nfs/nfs4renewd.c                    |    3 +--
 net/core/dst.c                         |    4 ++--
 net/core/link_watch.c                  |   21 ++++++---------------
 net/rfkill/input.c                     |    3 +--
 25 files changed, 58 insertions(+), 149 deletions(-)

diff --git a/block/blk-core.c b/block/blk-core.c
index 93eb3e4..43f6c17 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -319,10 +319,8 @@ EXPORT_SYMBOL(__blk_run_queue);
  */
 void blk_run_queue_async(struct request_queue *q)
 {
-	if (likely(!blk_queue_stopped(q))) {
-		__cancel_delayed_work(&q->delay_work);
-		queue_delayed_work(kblockd_workqueue, &q->delay_work, 0);
-	}
+	if (likely(!blk_queue_stopped(q)))
+		mod_delayed_work(kblockd_workqueue, &q->delay_work, 0);
 }
 EXPORT_SYMBOL(blk_run_queue_async);
 
diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index 5b06595..69516e6 100644
--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -930,12 +930,7 @@ throtl_schedule_delayed_work(struct throtl_data *td, unsigned long delay)
 
 	/* schedule work if limits changed even if no bio is queued */
 	if (total_nr_queued(td) || td->limits_changed) {
-		/*
-		 * We might have a work scheduled to be executed in future.
-		 * Cancel that and schedule a new one.
-		 */
-		__cancel_delayed_work(dwork);
-		queue_delayed_work(kthrotld_workqueue, dwork, delay);
+		mod_delayed_work(kthrotld_workqueue, dwork, delay);
 		throtl_log(td, "schedule work. delay=%lu jiffies=%lu",
 				delay, jiffies);
 	}
diff --git a/block/genhd.c b/block/genhd.c
index 9cf5583..ba16f2f 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -1524,10 +1524,8 @@ void disk_flush_events(struct gendisk *disk, unsigned int mask)
 
 	spin_lock_irq(&ev->lock);
 	ev->clearing |= mask;
-	if (!ev->block) {
-		cancel_delayed_work(&ev->dwork);
-		queue_delayed_work(system_nrt_freezable_wq, &ev->dwork, 0);
-	}
+	if (!ev->block)
+		mod_delayed_work(system_nrt_freezable_wq, &ev->dwork, 0);
 	spin_unlock_irq(&ev->lock);
 }
 
diff --git a/drivers/block/floppy.c b/drivers/block/floppy.c
index 553f43a..aebd1e8 100644
--- a/drivers/block/floppy.c
+++ b/drivers/block/floppy.c
@@ -671,7 +671,6 @@ static void __reschedule_timeout(int drive, const char *message)
 
 	if (drive == current_reqD)
 		drive = current_drive;
-	__cancel_delayed_work(&fd_timeout);
 
 	if (drive < 0 || drive >= N_DRIVE) {
 		delay = 20UL * HZ;
@@ -679,7 +678,7 @@ static void __reschedule_timeout(int drive, const char *message)
 	} else
 		delay = UDP->timeout;
 
-	queue_delayed_work(floppy_wq, &fd_timeout, delay);
+	mod_delayed_work(floppy_wq, &fd_timeout, delay);
 	if (UDP->flags & FD_DEBUG)
 		DPRINT("reschedule timeout %s\n", message);
 	timeout_message = message;
diff --git a/drivers/edac/edac_mc.c b/drivers/edac/edac_mc.c
index de5ba86e..9dbde5f 100644
--- a/drivers/edac/edac_mc.c
+++ b/drivers/edac/edac_mc.c
@@ -492,7 +492,7 @@ static void edac_mc_workq_setup(struct mem_ctl_info *mci, unsigned msec)
 		return;
 
 	INIT_DELAYED_WORK(&mci->work, edac_mc_workq_function);
-	queue_delayed_work(edac_workqueue, &mci->work, msecs_to_jiffies(msec));
+	mod_delayed_work(edac_workqueue, &mci->work, msecs_to_jiffies(msec));
 }
 
 /*
@@ -533,21 +533,6 @@ void edac_mc_reset_delay_period(int value)
 
 	mutex_lock(&mem_ctls_mutex);
 
-	/* scan the list and turn off all workq timers, doing so under lock
-	 */
-	list_for_each(item, &mc_devices) {
-		mci = list_entry(item, struct mem_ctl_info, link);
-
-		if (mci->op_state == OP_RUNNING_POLL)
-			cancel_delayed_work(&mci->work);
-	}
-
-	mutex_unlock(&mem_ctls_mutex);
-
-
-	/* re-walk the list, and reset the poll delay */
-	mutex_lock(&mem_ctls_mutex);
-
 	list_for_each(item, &mc_devices) {
 		mci = list_entry(item, struct mem_ctl_info, link);
 
diff --git a/drivers/infiniband/core/addr.c b/drivers/infiniband/core/addr.c
index 28058ae..eaec8d7 100644
--- a/drivers/infiniband/core/addr.c
+++ b/drivers/infiniband/core/addr.c
@@ -152,13 +152,11 @@ static void set_timeout(unsigned long time)
 {
 	unsigned long delay;
 
-	cancel_delayed_work(&work);
-
 	delay = time - jiffies;
 	if ((long)delay <= 0)
 		delay = 1;
 
-	queue_delayed_work(addr_wq, &work, delay);
+	mod_delayed_work(addr_wq, &work, delay);
 }
 
 static void queue_req(struct addr_req *req)
diff --git a/drivers/infiniband/core/mad.c b/drivers/infiniband/core/mad.c
index b0d0bc8..b593814 100644
--- a/drivers/infiniband/core/mad.c
+++ b/drivers/infiniband/core/mad.c
@@ -2013,13 +2013,11 @@ static void adjust_timeout(struct ib_mad_agent_private *mad_agent_priv)
 		if (time_after(mad_agent_priv->timeout,
 			       mad_send_wr->timeout)) {
 			mad_agent_priv->timeout = mad_send_wr->timeout;
-			__cancel_delayed_work(&mad_agent_priv->timed_work);
 			delay = mad_send_wr->timeout - jiffies;
 			if ((long)delay <= 0)
 				delay = 1;
-			queue_delayed_work(mad_agent_priv->qp_info->
-					   port_priv->wq,
-					   &mad_agent_priv->timed_work, delay);
+			mod_delayed_work(mad_agent_priv->qp_info->port_priv->wq,
+					 &mad_agent_priv->timed_work, delay);
 		}
 	}
 }
@@ -2052,11 +2050,9 @@ static void wait_for_response(struct ib_mad_send_wr_private *mad_send_wr)
 	list_add(&mad_send_wr->agent_list, list_item);
 
 	/* Reschedule a work item if we have a shorter timeout */
-	if (mad_agent_priv->wait_list.next == &mad_send_wr->agent_list) {
-		__cancel_delayed_work(&mad_agent_priv->timed_work);
-		queue_delayed_work(mad_agent_priv->qp_info->port_priv->wq,
-				   &mad_agent_priv->timed_work, delay);
-	}
+	if (mad_agent_priv->wait_list.next == &mad_send_wr->agent_list)
+		mod_delayed_work(mad_agent_priv->qp_info->port_priv->wq,
+				 &mad_agent_priv->timed_work, delay);
 }
 
 void ib_reset_mad_timeout(struct ib_mad_send_wr_private *mad_send_wr,
diff --git a/drivers/infiniband/hw/nes/nes_hw.c b/drivers/infiniband/hw/nes/nes_hw.c
index d42c9f4..9e0895b 100644
--- a/drivers/infiniband/hw/nes/nes_hw.c
+++ b/drivers/infiniband/hw/nes/nes_hw.c
@@ -2679,11 +2679,9 @@ static void nes_process_mac_intr(struct nes_device *nesdev, u32 mac_number)
 			}
 		}
 		if (nesadapter->phy_type[mac_index] == NES_PHY_TYPE_SFP_D) {
-			if (nesdev->link_recheck)
-				cancel_delayed_work(&nesdev->work);
 			nesdev->link_recheck = 1;
-			schedule_delayed_work(&nesdev->work,
-					      NES_LINK_RECHECK_DELAY);
+			mod_delayed_work(system_wq, &nesdev->work,
+					 NES_LINK_RECHECK_DELAY);
 		}
 	}
 
diff --git a/drivers/infiniband/hw/nes/nes_nic.c b/drivers/infiniband/hw/nes/nes_nic.c
index f3a3ecf..e43f6e4 100644
--- a/drivers/infiniband/hw/nes/nes_nic.c
+++ b/drivers/infiniband/hw/nes/nes_nic.c
@@ -243,10 +243,9 @@ static int nes_netdev_open(struct net_device *netdev)
 
 	spin_lock_irqsave(&nesdev->nesadapter->phy_lock, flags);
 	if (nesdev->nesadapter->phy_type[nesdev->mac_index] == NES_PHY_TYPE_SFP_D) {
-		if (nesdev->link_recheck)
-			cancel_delayed_work(&nesdev->work);
 		nesdev->link_recheck = 1;
-		schedule_delayed_work(&nesdev->work, NES_LINK_RECHECK_DELAY);
+		mod_delayed_work(system_wq, &nesdev->work,
+				 NES_LINK_RECHECK_DELAY);
 	}
 	spin_unlock_irqrestore(&nesdev->nesadapter->phy_lock, flags);
 
diff --git a/drivers/input/keyboard/qt2160.c b/drivers/input/keyboard/qt2160.c
index e7a5e36..76b7d43 100644
--- a/drivers/input/keyboard/qt2160.c
+++ b/drivers/input/keyboard/qt2160.c
@@ -156,8 +156,7 @@ static irqreturn_t qt2160_irq(int irq, void *_qt2160)
 
 	spin_lock_irqsave(&qt2160->lock, flags);
 
-	__cancel_delayed_work(&qt2160->dwork);
-	schedule_delayed_work(&qt2160->dwork, 0);
+	mod_delayed_work(system_wq, &qt2160->dwork, 0);
 
 	spin_unlock_irqrestore(&qt2160->lock, flags);
 
diff --git a/drivers/input/mouse/synaptics_i2c.c b/drivers/input/mouse/synaptics_i2c.c
index f1467570..063a174 100644
--- a/drivers/input/mouse/synaptics_i2c.c
+++ b/drivers/input/mouse/synaptics_i2c.c
@@ -376,12 +376,7 @@ static void synaptics_i2c_reschedule_work(struct synaptics_i2c *touch,
 
 	spin_lock_irqsave(&touch->lock, flags);
 
-	/*
-	 * If work is already scheduled then subsequent schedules will not
-	 * change the scheduled time that's why we have to cancel it first.
-	 */
-	__cancel_delayed_work(&touch->dwork);
-	schedule_delayed_work(&touch->dwork, delay);
+	mod_delayed_work(system_wq, &touch->dwork, delay);
 
 	spin_unlock_irqrestore(&touch->lock, flags);
 }
diff --git a/drivers/net/wireless/ipw2x00/ipw2100.c b/drivers/net/wireless/ipw2x00/ipw2100.c
index 95aa8e1..8a34202 100644
--- a/drivers/net/wireless/ipw2x00/ipw2100.c
+++ b/drivers/net/wireless/ipw2x00/ipw2100.c
@@ -2180,8 +2180,7 @@ static void isr_indicate_rf_kill(struct ipw2100_priv *priv, u32 status)
 
 	/* Make sure the RF Kill check timer is running */
 	priv->stop_rf_kill = 0;
-	cancel_delayed_work(&priv->rf_kill);
-	schedule_delayed_work(&priv->rf_kill, round_jiffies_relative(HZ));
+	mod_delayed_work(system_wq, &priv->rf_kill, round_jiffies_relative(HZ));
 }
 
 static void send_scan_event(void *data)
@@ -4321,9 +4320,8 @@ static int ipw_radio_kill_sw(struct ipw2100_priv *priv, int disable_radio)
 					  "disabled by HW switch\n");
 			/* Make sure the RF_KILL check timer is running */
 			priv->stop_rf_kill = 0;
-			cancel_delayed_work(&priv->rf_kill);
-			schedule_delayed_work(&priv->rf_kill,
-					      round_jiffies_relative(HZ));
+			mod_delayed_work(system_wq, &priv->rf_kill,
+					 round_jiffies_relative(HZ));
 		} else
 			schedule_reset(priv);
 	}
diff --git a/drivers/net/wireless/zd1211rw/zd_usb.c b/drivers/net/wireless/zd1211rw/zd_usb.c
index af83c43..ef2b171 100644
--- a/drivers/net/wireless/zd1211rw/zd_usb.c
+++ b/drivers/net/wireless/zd1211rw/zd_usb.c
@@ -1164,8 +1164,7 @@ void zd_usb_reset_rx_idle_timer(struct zd_usb *usb)
 {
 	struct zd_usb_rx *rx = &usb->rx;
 
-	cancel_delayed_work(&rx->idle_work);
-	queue_delayed_work(zd_workqueue, &rx->idle_work, ZD_RX_IDLE_INTERVAL);
+	mod_delayed_work(zd_workqueue, &rx->idle_work, ZD_RX_IDLE_INTERVAL);
 }
 
 static inline void init_usb_interrupt(struct zd_usb *usb)
diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c
index d5fd4a1..00d32a7 100644
--- a/drivers/platform/x86/thinkpad_acpi.c
+++ b/drivers/platform/x86/thinkpad_acpi.c
@@ -7683,25 +7683,15 @@ static int fan_set_speed(int speed)
 
 static void fan_watchdog_reset(void)
 {
-	static int fan_watchdog_active;
-
 	if (fan_control_access_mode == TPACPI_FAN_WR_NONE)
 		return;
 
-	if (fan_watchdog_active)
-		cancel_delayed_work(&fan_watchdog_task);
-
 	if (fan_watchdog_maxinterval > 0 &&
-	    tpacpi_lifecycle != TPACPI_LIFE_EXITING) {
-		fan_watchdog_active = 1;
-		if (!queue_delayed_work(tpacpi_wq, &fan_watchdog_task,
-				msecs_to_jiffies(fan_watchdog_maxinterval
-						 * 1000))) {
-			pr_err("failed to queue the fan watchdog, "
-			       "watchdog will not trigger\n");
-		}
-	} else
-		fan_watchdog_active = 0;
+	    tpacpi_lifecycle != TPACPI_LIFE_EXITING)
+		mod_delayed_work(tpacpi_wq, &fan_watchdog_task,
+			msecs_to_jiffies(fan_watchdog_maxinterval * 1000));
+	else
+		cancel_delayed_work(&fan_watchdog_task);
 }
 
 static void fan_watchdog_fire(struct work_struct *ignored)
diff --git a/drivers/power/charger-manager.c b/drivers/power/charger-manager.c
index 86935ec..0db0444 100644
--- a/drivers/power/charger-manager.c
+++ b/drivers/power/charger-manager.c
@@ -512,9 +512,8 @@ static void _setup_polling(struct work_struct *work)
 	if (!delayed_work_pending(&cm_monitor_work) ||
 	    (delayed_work_pending(&cm_monitor_work) &&
 	     time_after(next_polling, _next_polling))) {
-		cancel_delayed_work_sync(&cm_monitor_work);
 		next_polling = jiffies + polling_jiffy;
-		queue_delayed_work(cm_wq, &cm_monitor_work, polling_jiffy);
+		mod_delayed_work(cm_wq, &cm_monitor_work, polling_jiffy);
 	}
 
 out:
@@ -549,10 +548,8 @@ static void fullbatt_handler(struct charger_manager *cm)
 	if (cm_suspended)
 		device_set_wakeup_capable(cm->dev, true);
 
-	if (delayed_work_pending(&cm->fullbatt_vchk_work))
-		cancel_delayed_work(&cm->fullbatt_vchk_work);
-	queue_delayed_work(cm_wq, &cm->fullbatt_vchk_work,
-			   msecs_to_jiffies(desc->fullbatt_vchkdrop_ms));
+	mod_delayed_work(cm_wq, &cm->fullbatt_vchk_work,
+			 msecs_to_jiffies(desc->fullbatt_vchkdrop_ms));
 	cm->fullbatt_vchk_jiffies_at = jiffies + msecs_to_jiffies(
 				       desc->fullbatt_vchkdrop_ms);
 
diff --git a/drivers/power/ds2760_battery.c b/drivers/power/ds2760_battery.c
index 076e211..704e652 100644
--- a/drivers/power/ds2760_battery.c
+++ b/drivers/power/ds2760_battery.c
@@ -355,8 +355,7 @@ static void ds2760_battery_external_power_changed(struct power_supply *psy)
 
 	dev_dbg(di->dev, "%s\n", __func__);
 
-	cancel_delayed_work(&di->monitor_work);
-	queue_delayed_work(di->monitor_wqueue, &di->monitor_work, HZ/10);
+	mod_delayed_work(di->monitor_wqueue, &di->monitor_work, HZ/10);
 }
 
 
@@ -401,8 +400,7 @@ static void ds2760_battery_set_charged(struct power_supply *psy)
 
 	/* postpone the actual work by 20 secs. This is for debouncing GPIO
 	 * signals and to let the current value settle. See AN4188. */
-	cancel_delayed_work(&di->set_charged_work);
-	queue_delayed_work(di->monitor_wqueue, &di->set_charged_work, HZ * 20);
+	mod_delayed_work(di->monitor_wqueue, &di->set_charged_work, HZ * 20);
 }
 
 static int ds2760_battery_get_property(struct power_supply *psy,
@@ -616,8 +614,7 @@ static int ds2760_battery_resume(struct platform_device *pdev)
 	di->charge_status = POWER_SUPPLY_STATUS_UNKNOWN;
 	power_supply_changed(&di->bat);
 
-	cancel_delayed_work(&di->monitor_work);
-	queue_delayed_work(di->monitor_wqueue, &di->monitor_work, HZ);
+	mod_delayed_work(di->monitor_wqueue, &di->monitor_work, HZ);
 
 	return 0;
 }
diff --git a/drivers/power/jz4740-battery.c b/drivers/power/jz4740-battery.c
index 8dbc7bf..ffbed5e 100644
--- a/drivers/power/jz4740-battery.c
+++ b/drivers/power/jz4740-battery.c
@@ -173,16 +173,14 @@ static void jz_battery_external_power_changed(struct power_supply *psy)
 {
 	struct jz_battery *jz_battery = psy_to_jz_battery(psy);
 
-	cancel_delayed_work(&jz_battery->work);
-	schedule_delayed_work(&jz_battery->work, 0);
+	mod_delayed_work(system_wq, &jz_battery->work, 0);
 }
 
 static irqreturn_t jz_battery_charge_irq(int irq, void *data)
 {
 	struct jz_battery *jz_battery = data;
 
-	cancel_delayed_work(&jz_battery->work);
-	schedule_delayed_work(&jz_battery->work, 0);
+	mod_delayed_work(system_wq, &jz_battery->work, 0);
 
 	return IRQ_HANDLED;
 }
diff --git a/drivers/thermal/thermal_sys.c b/drivers/thermal/thermal_sys.c
index 2d7a9fe..a937838 100644
--- a/drivers/thermal/thermal_sys.c
+++ b/drivers/thermal/thermal_sys.c
@@ -694,17 +694,14 @@ thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
 static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
 					    int delay)
 {
-	cancel_delayed_work(&(tz->poll_queue));
-
-	if (!delay)
-		return;
-
 	if (delay > 1000)
-		queue_delayed_work(system_freezable_wq, &(tz->poll_queue),
-				      round_jiffies(msecs_to_jiffies(delay)));
+		mod_delayed_work(system_freezable_wq, &tz->poll_queue,
+				 round_jiffies(msecs_to_jiffies(delay)));
+	else if (delay)
+		mod_delayed_work(system_freezable_wq, &tz->poll_queue,
+				 msecs_to_jiffies(delay));
 	else
-		queue_delayed_work(system_freezable_wq, &(tz->poll_queue),
-				      msecs_to_jiffies(delay));
+		cancel_delayed_work(&tz->poll_queue);
 }
 
 static void thermal_zone_device_passive(struct thermal_zone_device *tz,
diff --git a/fs/afs/callback.c b/fs/afs/callback.c
index 587ef51..7ef637d 100644
--- a/fs/afs/callback.c
+++ b/fs/afs/callback.c
@@ -351,9 +351,7 @@ void afs_dispatch_give_up_callbacks(struct work_struct *work)
  */
 void afs_flush_callback_breaks(struct afs_server *server)
 {
-	cancel_delayed_work(&server->cb_break_work);
-	queue_delayed_work(afs_callback_update_worker,
-			   &server->cb_break_work, 0);
+	mod_delayed_work(afs_callback_update_worker, &server->cb_break_work, 0);
 }
 
 #if 0
diff --git a/fs/afs/server.c b/fs/afs/server.c
index d59b751..f342acf 100644
--- a/fs/afs/server.c
+++ b/fs/afs/server.c
@@ -285,12 +285,7 @@ static void afs_reap_server(struct work_struct *work)
 		expiry = server->time_of_death + afs_server_timeout;
 		if (expiry > now) {
 			delay = (expiry - now) * HZ;
-			if (!queue_delayed_work(afs_wq, &afs_server_reaper,
-						delay)) {
-				cancel_delayed_work(&afs_server_reaper);
-				queue_delayed_work(afs_wq, &afs_server_reaper,
-						   delay);
-			}
+			mod_delayed_work(afs_wq, &afs_server_reaper, delay);
 			break;
 		}
 
@@ -323,6 +318,5 @@ static void afs_reap_server(struct work_struct *work)
 void __exit afs_purge_servers(void)
 {
 	afs_server_timeout = 0;
-	cancel_delayed_work(&afs_server_reaper);
-	queue_delayed_work(afs_wq, &afs_server_reaper, 0);
+	mod_delayed_work(afs_wq, &afs_server_reaper, 0);
 }
diff --git a/fs/afs/vlocation.c b/fs/afs/vlocation.c
index 431984d..57bcb15 100644
--- a/fs/afs/vlocation.c
+++ b/fs/afs/vlocation.c
@@ -561,12 +561,7 @@ static void afs_vlocation_reaper(struct work_struct *work)
 		if (expiry > now) {
 			delay = (expiry - now) * HZ;
 			_debug("delay %lu", delay);
-			if (!queue_delayed_work(afs_wq, &afs_vlocation_reap,
-						delay)) {
-				cancel_delayed_work(&afs_vlocation_reap);
-				queue_delayed_work(afs_wq, &afs_vlocation_reap,
-						   delay);
-			}
+			mod_delayed_work(afs_wq, &afs_vlocation_reap, delay);
 			break;
 		}
 
@@ -614,13 +609,10 @@ void afs_vlocation_purge(void)
 	spin_lock(&afs_vlocation_updates_lock);
 	list_del_init(&afs_vlocation_updates);
 	spin_unlock(&afs_vlocation_updates_lock);
-	cancel_delayed_work(&afs_vlocation_update);
-	queue_delayed_work(afs_vlocation_update_worker,
-			   &afs_vlocation_update, 0);
+	mod_delayed_work(afs_vlocation_update_worker, &afs_vlocation_update, 0);
 	destroy_workqueue(afs_vlocation_update_worker);
 
-	cancel_delayed_work(&afs_vlocation_reap);
-	queue_delayed_work(afs_wq, &afs_vlocation_reap, 0);
+	mod_delayed_work(afs_wq, &afs_vlocation_reap, 0);
 }
 
 /*
diff --git a/fs/nfs/nfs4renewd.c b/fs/nfs/nfs4renewd.c
index 6930bec..1720d32 100644
--- a/fs/nfs/nfs4renewd.c
+++ b/fs/nfs/nfs4renewd.c
@@ -117,8 +117,7 @@ nfs4_schedule_state_renewal(struct nfs_client *clp)
 		timeout = 5 * HZ;
 	dprintk("%s: requeueing work. Lease period = %ld\n",
 			__func__, (timeout + HZ - 1) / HZ);
-	cancel_delayed_work(&clp->cl_renewd);
-	schedule_delayed_work(&clp->cl_renewd, timeout);
+	mod_delayed_work(system_wq, &clp->cl_renewd, timeout);
 	set_bit(NFS_CS_RENEWD, &clp->cl_res_state);
 	spin_unlock(&clp->cl_lock);
 }
diff --git a/net/core/dst.c b/net/core/dst.c
index 069d51d..ed5a0b4 100644
--- a/net/core/dst.c
+++ b/net/core/dst.c
@@ -214,8 +214,8 @@ void __dst_free(struct dst_entry *dst)
 	if (dst_garbage.timer_inc > DST_GC_INC) {
 		dst_garbage.timer_inc = DST_GC_INC;
 		dst_garbage.timer_expires = DST_GC_MIN;
-		cancel_delayed_work(&dst_gc_work);
-		schedule_delayed_work(&dst_gc_work, dst_garbage.timer_expires);
+		mod_delayed_work(system_wq, &dst_gc_work,
+				 dst_garbage.timer_expires);
 	}
 	spin_unlock_bh(&dst_garbage.lock);
 }
diff --git a/net/core/link_watch.c b/net/core/link_watch.c
index c3519c6..8e397a6 100644
--- a/net/core/link_watch.c
+++ b/net/core/link_watch.c
@@ -120,22 +120,13 @@ static void linkwatch_schedule_work(int urgent)
 		delay = 0;
 
 	/*
-	 * This is true if we've scheduled it immeditately or if we don't
-	 * need an immediate execution and it's already pending.
+	 * If urgent, schedule immediate execution; otherwise, don't
+	 * override the existing timer.
 	 */
-	if (schedule_delayed_work(&linkwatch_work, delay) == !delay)
-		return;
-
-	/* Don't bother if there is nothing urgent. */
-	if (!test_bit(LW_URGENT, &linkwatch_flags))
-		return;
-
-	/* It's already running which is good enough. */
-	if (!__cancel_delayed_work(&linkwatch_work))
-		return;
-
-	/* Otherwise we reschedule it again for immediate execution. */
-	schedule_delayed_work(&linkwatch_work, 0);
+	if (test_bit(LW_URGENT, &linkwatch_flags))
+		mod_delayed_work(system_wq, &linkwatch_work, 0);
+	else
+		schedule_delayed_work(&linkwatch_work, delay);
 }
 
 
diff --git a/net/rfkill/input.c b/net/rfkill/input.c
index 24c55c5..c9d931e 100644
--- a/net/rfkill/input.c
+++ b/net/rfkill/input.c
@@ -164,8 +164,7 @@ static void rfkill_schedule_global_op(enum rfkill_sched_op op)
 	rfkill_op_pending = true;
 	if (op == RFKILL_GLOBAL_OP_EPO && !rfkill_is_epo_lock_active()) {
 		/* bypass the limiter for EPO */
-		cancel_delayed_work(&rfkill_op_work);
-		schedule_delayed_work(&rfkill_op_work, 0);
+		mod_delayed_work(system_wq, &rfkill_op_work, 0);
 		rfkill_last_scheduled = jiffies;
 	} else
 		rfkill_schedule_ratelimited();
-- 
1.7.7.3

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