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Add "run_scheduled_work()" workqueue function

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This allows workqueue users to run just their own pending work, rather
than wait for the whole workqueue to finish running.  This solves the
deadlock with networking libphy that was due to other workqueue entries
possibly needing a lock that was held by the routine that wanted to
flush its own work.

It's not wonderful: if you absolutely need to synchronize with the work
function having been executed, any user strictly speaking should have
its own completion tracking logic, since when we run things explicitly
by hand, the generic workqueue layer can no longer help us synchronize.

Also, this is strictly only usable for work that has been scheduled
without any delayed timers.  You can not mix the new interface with
schedule_delayed_work().

But it's better than what we had currently.

Acked-by: Maciej W. Rozycki <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Linus Torvalds 2006-12-07 09:28:19 -08:00
commit 68380b5813
3 changed files with 75 additions and 2 deletions
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3
drivers/net/phy/phy.c
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@ -587,8 +587,7 @@ int phy_stop_interrupts(struct phy_device *phydev)
* Finish any pending work; we might have been scheduled
* to be called from keventd ourselves, though.
*/
if (!current_is_keventd())
flush_scheduled_work();
run_scheduled_work(&phydev->phy_queue);
free_irq(phydev->irq, phydev);