From: "Rafael J. Wysocki" <rjw@sisk.pl>
To: Oliver Neukum <oliver@neukum.name>
Cc: linux-kernel@vger.kernel.org, nigel@nigel.suspend2.net,
pm list <linux-pm@lists.osdl.org>
Subject: Re: question on resume()
Date: Wed, 31 Jan 2007 09:49:03 +0100 [thread overview]
Message-ID: <200701310949.04110.rjw@sisk.pl> (raw)
In-Reply-To: <200701310940.26040.oliver@neukum.name>
On Wednesday, 31 January 2007 09:40, Oliver Neukum wrote:
> Am Mittwoch, 31. Januar 2007 09:33 schrieb Rafael J. Wysocki:
> > On Tuesday, 30 January 2007 23:32, Rafael J. Wysocki wrote:
>
> > > Generally, you are safe if your driver only calls wake_up() from a process
> > > context, but not from .resume() or .suspend() routines (or from an
> > > unfreezeable kernel thread).
> >
> > Ah, sorry, I've just realized I was wrong. Processes in TASK_UNINTERRUPTIBLE
> > cannot be frozen! So, the above only applies to wake_up_interruptible().
>
> So the kernel will wait for tasks in TASK_UNINTERRUPTIBLE to finish IO
> before it calls suspend()? I am confused.
Yes, it will. The process freezer can only return success if there are no more
TASK_UNINTERRUPTIBLE tasks. Otherwise it fails (after a timeout).
Greetings,
Rafael
--
If you don't have the time to read,
you don't have the time or the tools to write.
- Stephen King
next prev parent reply other threads:[~2007-01-31 8:49 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-01-29 11:06 question on resume() Oliver Neukum
2007-01-29 11:24 ` Nigel Cunningham
2007-01-29 11:34 ` Oliver Neukum
2007-01-29 20:14 ` Nigel Cunningham
2007-01-29 21:04 ` Oliver Neukum
2007-01-29 21:21 ` Nigel Cunningham
2007-01-29 23:10 ` Rafael J. Wysocki
2007-01-30 16:32 ` Rafael J. Wysocki
2007-01-30 16:50 ` Oliver Neukum
2007-01-30 22:32 ` Rafael J. Wysocki
2007-01-30 22:32 ` Rafael J. Wysocki
2007-01-31 8:33 ` Rafael J. Wysocki
2007-01-31 8:33 ` Rafael J. Wysocki
2007-01-31 8:40 ` Oliver Neukum
2007-01-31 8:40 ` Oliver Neukum
2007-01-31 8:49 ` Rafael J. Wysocki [this message]
2007-01-31 9:04 ` Oliver Neukum
2007-01-31 9:04 ` Oliver Neukum
2007-01-31 9:36 ` Pavel Machek
2007-01-31 9:36 ` [linux-pm] " Pavel Machek
2007-01-31 10:14 ` Oliver Neukum
2007-01-31 10:14 ` [linux-pm] " Oliver Neukum
2007-01-31 10:30 ` Pavel Machek
2007-01-31 15:54 ` Alan Stern
2007-01-31 15:54 ` [linux-pm] " Alan Stern
2007-01-31 16:12 ` Oliver Neukum
2007-01-31 16:12 ` [linux-pm] " Oliver Neukum
2007-01-31 16:27 ` Alan Stern
2007-01-31 16:27 ` [linux-pm] " Alan Stern
2007-01-31 18:04 ` Woodruff, Richard
2007-01-31 18:04 ` [linux-pm] " Woodruff, Richard
2007-01-31 15:48 ` Alan Stern
2007-01-31 15:48 ` [linux-pm] " Alan Stern
2007-01-31 18:52 ` Rafael J. Wysocki
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