From: Matthew Garrett <mjg59@srcf.ucam.org>
To: Willy Tarreau <w@1wt.eu>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>,
Daniel Barkalow <barkalow@iabervon.org>,
nigel@nigel.suspend2.net, Robert Hancock <hancockr@shaw.ca>,
linux-kernel <linux-kernel@vger.kernel.org>,
Jeff Garzik <jeff@garzik.org>, Pavel Machek <pavel@ucw.cz>,
pm list <linux-pm@lists.osdl.org>
Subject: Re: [PATCH] Re: NAK new drivers without proper power management?
Date: Sun, 11 Feb 2007 12:13:40 +0000 [thread overview]
Message-ID: <20070211121339.GB4204@srcf.ucam.org> (raw)
In-Reply-To: <20070211065404.GA943@1wt.eu>
On Sun, Feb 11, 2007 at 07:54:04AM +0100, Willy Tarreau wrote:
> instead of modifying all drivers to explicitly state that they don't support
> it, we should start with a test of the NULL pointer for .suspend which should
> mean exactly the same without modifying the drivers. I find it obvious that
> a driver which does provide a suspend function will not support it. And if
> some drivers (eg /dev/null) can support it anyway, it's better to change
> *those* drivers to explicitly mark them as compatible.
No, that doesn't work. In the absence of suspend/resume methods, the PCI
layer will implement basic PM itself. In some cases, this works. In
others, it doesn't. There's no way to automatically determine which is
which without modifying the drivers.
--
Matthew Garrett | mjg59@srcf.ucam.org
next prev parent reply other threads:[~2007-02-11 12:14 UTC|newest]
Thread overview: 81+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <fa.xSKPgY66Q+DPCZ1pszFFfdrJ0To@ifi.uio.no>
[not found] ` <fa.FzHdYYYH5Ru57c8/yRxLylpH0Kk@ifi.uio.no>
[not found] ` <fa.DuG12yQo+RR4jIjJTnoOwtKM0Ao@ifi.uio.no>
[not found] ` <fa.Jy0FJQtASvVEpsy8Q96uoHtyEVA@ifi.uio.no>
2007-02-10 1:50 ` NAK new drivers without proper power management? Robert Hancock
2007-02-10 1:59 ` Lee Revell
2007-02-10 2:09 ` Nigel Cunningham
2007-02-10 2:22 ` Lee Revell
2007-02-10 3:21 ` Kevin Fox
2007-02-10 20:40 ` Adrian Bunk
2007-02-10 4:35 ` Joseph Fannin
2007-02-13 21:08 ` Pavel Machek
2007-02-10 12:47 ` Stefan Richter
2007-02-10 2:05 ` Nigel Cunningham
2007-02-10 3:27 ` Dmitry Torokhov
2007-02-10 4:18 ` Nigel Cunningham
2007-02-10 3:02 ` [PATCH] " Nigel Cunningham
2007-02-10 9:34 ` Rafael J. Wysocki
2007-02-10 9:34 ` Rafael J. Wysocki
2007-02-10 10:02 ` Nigel Cunningham
2007-02-10 10:30 ` Rafael J. Wysocki
2007-02-10 10:30 ` Rafael J. Wysocki
2007-02-10 17:52 ` Daniel Barkalow
2007-02-10 17:52 ` Daniel Barkalow
2007-02-10 19:50 ` Rafael J. Wysocki
2007-02-10 19:50 ` Rafael J. Wysocki
2007-02-11 6:54 ` Willy Tarreau
2007-02-11 6:54 ` Willy Tarreau
2007-02-11 12:13 ` Matthew Garrett [this message]
2007-02-11 13:09 ` Willy Tarreau
2007-02-11 13:09 ` Willy Tarreau
2007-02-11 13:19 ` Matthew Garrett
2007-02-11 13:37 ` Willy Tarreau
2007-02-11 13:37 ` Willy Tarreau
2007-02-11 13:50 ` Rafael J. Wysocki
2007-02-11 13:50 ` Rafael J. Wysocki
2007-02-11 13:57 ` Willy Tarreau
2007-02-11 13:57 ` Willy Tarreau
2007-02-11 14:36 ` Rafael J. Wysocki
2007-02-11 14:36 ` Rafael J. Wysocki
2007-02-11 15:19 ` Pekka Enberg
2007-02-11 15:19 ` Pekka Enberg
2007-02-11 18:31 ` Rafael J. Wysocki
2007-02-11 18:31 ` Rafael J. Wysocki
2007-02-11 17:27 ` Daniel Barkalow
2007-02-11 18:53 ` Rafael J. Wysocki
2007-02-11 18:53 ` Rafael J. Wysocki
2007-02-11 23:06 ` Nigel Cunningham
2007-02-11 23:06 ` Nigel Cunningham
2007-02-11 23:10 ` Rafael J. Wysocki
2007-02-11 23:10 ` Rafael J. Wysocki
2007-02-11 21:04 ` Stefan Richter
2007-02-11 21:04 ` Stefan Richter
2007-02-11 21:10 ` Pavel Machek
2007-02-11 17:36 ` Robert Hancock
2007-02-11 22:49 ` Nigel Cunningham
2007-02-11 19:37 ` Pavel Machek
2007-02-11 19:37 ` Pavel Machek
[not found] ` <fa.DhkemAgVI60diqZy0t9GzpwyLmk@ifi.uio.no>
[not found] ` <fa.E/NjHlgg0HqDg5CgZjnCHFi2AMM@ifi.uio.no>
[not found] ` <fa.kop49l/7yexJoUGrzk6vVeIP934@ifi.uio.no>
2007-02-10 23:20 ` Robert Hancock
2007-02-11 0:44 ` Rafael J. Wysocki
2007-02-11 17:01 ` Pavel Machek
2007-02-11 22:40 ` Nigel Cunningham
2007-02-11 23:29 ` Rafael J. Wysocki
2007-02-11 23:40 ` Nigel Cunningham
[not found] ` <fa.EgQN5JpU6xrZSLyOY0kWjJ26hUM@ifi.uio.no>
2007-02-11 18:31 ` Robert Hancock
2007-02-11 21:52 ` Willy Tarreau
2007-02-11 22:26 ` Nigel Cunningham
2007-02-11 22:46 ` Willy Tarreau
2007-02-11 23:18 ` Nigel Cunningham
2007-02-11 23:38 ` Willy Tarreau
2007-02-11 23:45 ` Nigel Cunningham
2007-02-12 0:26 ` Alan
2007-02-12 5:19 ` Willy Tarreau
2007-02-12 20:20 ` Rafael J. Wysocki
2007-02-12 22:36 ` Nigel Cunningham
2007-02-11 23:23 ` Alan
2007-02-11 23:38 ` Rafael J. Wysocki
2007-02-11 23:41 ` Rafael J. Wysocki
2007-02-11 23:47 ` Nigel Cunningham
2007-02-11 23:50 ` Rafael J. Wysocki
2007-02-11 23:55 ` Nigel Cunningham
2007-02-12 0:09 ` Rafael J. Wysocki
2007-02-12 0:15 ` Nigel Cunningham
2007-02-12 12:19 ` Pavel Machek
[not found] ` <fa.O1YH4k5KtBGCNs5i2yB17bPvPGw@ifi.uio.no>
[not found] ` <fa.RfzClbTP/7B79AoEbQLNj3ABfIk@ifi.uio.no>
[not found] ` <fa.AaJ/ugmiUmPO8uC+y1rS9JLuuMc@ifi.uio.no>
2007-02-12 0:59 ` Robert Hancock
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