From: "Rafael J. Wysocki" <rjw@sisk.pl>
To: Oliver Neukum <oliver@neukum.org>
Cc: linux-pm@lists.linux-foundation.org,
Alan Stern <stern@rowland.harvard.edu>,
Partha Basak <p-basak2@ti.com>,
linux-omap@vger.kernel.org
Subject: Re: [linux-pm] [PATCH ver. 3] PM: add synchronous runtime interface for interrupt handlers
Date: Thu, 25 Nov 2010 21:03:29 +0100 [thread overview]
Message-ID: <201011252103.29401.rjw@sisk.pl> (raw)
In-Reply-To: <201011251958.49249.oliver@neukum.org>
On Thursday, November 25, 2010, Oliver Neukum wrote:
> Am Donnerstag, 25. November 2010, 16:52:39 schrieb Alan Stern:
> > When a device is declared irq-safe in this way, the PM core increments
> > the parent's usage count, so the parent will never be runtime
> > suspended. This prevents difficult situations in which an irq-safe
> > device can't resume because it is forced to wait for its non-irq-safe
> > parent.
>
> Shouldn't you walk further up the tree if the parent itself is irq-safe?
> It seems like a waste of power to not suspend a paren, that can be
> woken in irq.
Then we should walk up the tree if the parent's parent is irq-safe and so
on, which would make us spend uncertain amount of time in the ISR (or generally
with interrupts off). I think it's safer not to do that.
Thanks,
Rafael
next prev parent reply other threads:[~2010-11-25 20:04 UTC|newest]
Thread overview: 67+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-24 0:05 runtime_pm_get_sync() from ISR with IRQs disabled? Kevin Hilman
2010-09-24 15:13 ` [linux-pm] " Alan Stern
2010-09-24 18:54 ` Kevin Hilman
2010-09-24 20:04 ` Rafael J. Wysocki
2010-09-27 13:57 ` Alan Stern
2010-09-27 20:00 ` Rafael J. Wysocki
2010-09-27 20:39 ` Alan Stern
2010-09-27 21:09 ` Rafael J. Wysocki
2010-09-28 14:55 ` Alan Stern
2010-09-28 18:19 ` Rafael J. Wysocki
2010-09-30 18:25 ` [PATCH] PM: add synchronous runtime interface for interrupt handlers Alan Stern
2010-09-30 20:15 ` Rafael J. Wysocki
2010-09-30 21:42 ` Alan Stern
2010-09-30 22:41 ` Rafael J. Wysocki
2010-10-01 14:28 ` Alan Stern
2010-10-01 21:23 ` Rafael J. Wysocki
2010-10-02 14:12 ` Alan Stern
2010-10-02 22:06 ` Rafael J. Wysocki
2010-10-03 15:52 ` Alan Stern
2010-10-03 20:33 ` Rafael J. Wysocki
2010-10-05 21:44 ` Kevin Hilman
2010-10-06 15:58 ` Alan Stern
2010-10-06 19:33 ` Rafael J. Wysocki
2010-10-06 19:35 ` Kevin Hilman
2010-10-06 20:28 ` Alan Stern
2010-10-06 21:47 ` Rafael J. Wysocki
2010-10-07 15:26 ` Alan Stern
2010-10-07 16:52 ` Kevin Hilman
2010-10-07 17:35 ` Alan Stern
2010-10-07 21:11 ` Rafael J. Wysocki
2010-10-07 23:15 ` Kevin Hilman
2010-10-07 23:37 ` Rafael J. Wysocki
2010-10-07 23:55 ` Kevin Hilman
2010-10-08 16:22 ` Alan Stern
2010-10-08 21:04 ` Kevin Hilman
2010-10-08 19:57 ` Rafael J. Wysocki
2010-10-08 16:18 ` Alan Stern
2010-10-08 19:53 ` Rafael J. Wysocki
2010-10-09 11:09 ` [linux-pm] " Rafael J. Wysocki
2010-10-11 17:00 ` Alan Stern
2010-10-11 22:30 ` Rafael J. Wysocki
2010-11-19 15:45 ` [PATCH ver. 2] " Alan Stern
2010-11-20 12:56 ` Rafael J. Wysocki
2010-11-20 16:59 ` Alan Stern
2010-11-20 19:41 ` [linux-pm] " Alan Stern
2010-11-21 23:45 ` Rafael J. Wysocki
2010-11-21 23:41 ` Rafael J. Wysocki
2010-11-22 15:38 ` Alan Stern
2010-11-22 23:01 ` Rafael J. Wysocki
2010-11-23 3:19 ` Alan Stern
2010-11-23 22:51 ` Rafael J. Wysocki
2010-11-24 0:11 ` Kevin Hilman
2010-11-24 16:43 ` Alan Stern
2010-11-24 18:03 ` Kevin Hilman
2010-11-24 14:56 ` Alan Stern
2010-11-24 20:33 ` Rafael J. Wysocki
2010-11-25 15:52 ` [PATCH ver. 3] " Alan Stern
2010-11-25 18:58 ` [linux-pm] " Oliver Neukum
2010-11-25 20:03 ` Rafael J. Wysocki [this message]
2010-11-26 22:23 ` Rafael J. Wysocki
2010-10-06 23:51 ` [PATCH] " Kevin Hilman
2010-09-30 22:02 ` Rafael J. Wysocki
2010-10-01 14:12 ` Alan Stern
2010-10-01 21:14 ` Rafael J. Wysocki
2010-09-27 21:11 ` [linux-pm] runtime_pm_get_sync() from ISR with IRQs disabled? Kevin Hilman
2010-09-24 20:27 ` Alan Stern
2010-09-24 21:52 ` Kevin Hilman
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