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workqueue: use mod_delayed_work() instead of __cancel + queue

Browse Source 
Now that mod_delayed_work() is safe to call from IRQ handlers,
__cancel_delayed_work() followed by queue_delayed_work() can be
replaced with mod_delayed_work().

Most conversions are straight-forward except for the following.

* 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@kernel.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Tomi Valkeinen <tomi.valkeinen@ti.com>
This commit is contained in:
Tejun Heo 2012-08-21 13:18:24 -07:00
parent e0aecdd874
commit e7c2f96744
7 changed files with 17 additions and 44 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
block/blk-core.c
View File

@ -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);

7
block/blk-throttle.c
View File

@ -929,12 +929,7 @@ 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);
}

3
drivers/block/floppy.c
View File

@ -672,7 +672,6 @@ 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;
@ -680,7 +679,7 @@ 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;

14
drivers/infiniband/core/mad.c
View File

@ -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,

3
drivers/input/keyboard/qt2160.c
View File

@ -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);

7
drivers/input/mouse/synaptics_i2c.c
View File

@ -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);
}

21
net/core/link_watch.c
View File

@ -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);
}