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Merge branch 'for-2.6.38' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq

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* 'for-2.6.38' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq: (33 commits)
  usb: don't use flush_scheduled_work()
  speedtch: don't abuse struct delayed_work
  media/video: don't use flush_scheduled_work()
  media/video: explicitly flush request_module work
  ioc4: use static work_struct for ioc4_load_modules()
  init: don't call flush_scheduled_work() from do_initcalls()
  s390: don't use flush_scheduled_work()
  rtc: don't use flush_scheduled_work()
  mmc: update workqueue usages
  mfd: update workqueue usages
  dvb: don't use flush_scheduled_work()
  leds-wm8350: don't use flush_scheduled_work()
  mISDN: don't use flush_scheduled_work()
  macintosh/ams: don't use flush_scheduled_work()
  vmwgfx: don't use flush_scheduled_work()
  tpm: don't use flush_scheduled_work()
  sonypi: don't use flush_scheduled_work()
  hvsi: don't use flush_scheduled_work()
  xen: don't use flush_scheduled_work()
  gdrom: don't use flush_scheduled_work()
  ...

Fixed up trivial conflict in drivers/media/video/bt8xx/bttv-input.c
as per Tejun.
This commit is contained in:
Linus Torvalds
2011-01-07 16:58:04 -08:00
parent e744070fd4 569ff2de2e
commit 23d69b09b7
80 changed files with 289 additions and 156 deletions
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60
kernel/workqueue.c
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@@ -932,6 +932,38 @@ static void insert_work(struct cpu_workqueue_struct *cwq,
wake_up_worker(gcwq);
}
/*
* Test whether @work is being queued from another work executing on the
* same workqueue. This is rather expensive and should only be used from
* cold paths.
*/
static bool is_chained_work(struct workqueue_struct *wq)
{
unsigned long flags;
unsigned int cpu;
for_each_gcwq_cpu(cpu) {
struct global_cwq *gcwq = get_gcwq(cpu);
struct worker *worker;
struct hlist_node *pos;
int i;
spin_lock_irqsave(&gcwq->lock, flags);
for_each_busy_worker(worker, i, pos, gcwq) {
if (worker->task != current)
continue;
spin_unlock_irqrestore(&gcwq->lock, flags);
/*
* I'm @worker, no locking necessary. See if @work
* is headed to the same workqueue.
*/
return worker->current_cwq->wq == wq;
}
spin_unlock_irqrestore(&gcwq->lock, flags);
}
return false;
}
static void __queue_work(unsigned int cpu, struct workqueue_struct *wq,
struct work_struct *work)
{
@@ -943,7 +975,9 @@ static void __queue_work(unsigned int cpu, struct workqueue_struct *wq,
debug_work_activate(work);
if (WARN_ON_ONCE(wq->flags & WQ_DYING))
/* if dying, only works from the same workqueue are allowed */
if (unlikely(wq->flags & WQ_DYING) &&
WARN_ON_ONCE(!is_chained_work(wq)))
return;
/* determine gcwq to use */
@@ -2936,11 +2970,35 @@ EXPORT_SYMBOL_GPL(__alloc_workqueue_key);
*/
void destroy_workqueue(struct workqueue_struct *wq)
{
unsigned int flush_cnt = 0;
unsigned int cpu;
/*
* Mark @wq dying and drain all pending works. Once WQ_DYING is
* set, only chain queueing is allowed. IOW, only currently
* pending or running work items on @wq can queue further work
* items on it. @wq is flushed repeatedly until it becomes empty.
* The number of flushing is detemined by the depth of chaining and
* should be relatively short. Whine if it takes too long.
*/
wq->flags |= WQ_DYING;
reflush:
flush_workqueue(wq);
for_each_cwq_cpu(cpu, wq) {
struct cpu_workqueue_struct *cwq = get_cwq(cpu, wq);
if (!cwq->nr_active && list_empty(&cwq->delayed_works))
continue;
if (++flush_cnt == 10 ||
(flush_cnt % 100 == 0 && flush_cnt <= 1000))
printk(KERN_WARNING "workqueue %s: flush on "
"destruction isn't complete after %u tries\n",
wq->name, flush_cnt);
goto reflush;
}
/*
* wq list is used to freeze wq, remove from list after
* flushing is complete in case freeze races us.