From: Dan Williams <dcbw@redhat.com>
To: Matthew Garrett <mjg59@srcf.ucam.org>
Cc: Michael Wu <flamingice@sourmilk.net>,
Stephen Hemminger <shemminger@osdl.org>,
Arjan van de Ven <arjan@infradead.org>,
linux-kernel@vger.kernel.org, netdev@vger.kernel.org
Subject: Re: Network drivers that don't suspend on interface down
Date: Wed, 20 Dec 2006 22:14:08 -0500 [thread overview]
Message-ID: <1166670848.23168.21.camel@localhost.localdomain> (raw)
In-Reply-To: <20061221021832.GA723@srcf.ucam.org>
On Thu, 2006-12-21 at 02:18 +0000, Matthew Garrett wrote:
> On Wed, Dec 20, 2006 at 09:05:27PM -0500, Michael Wu wrote:
>
> > Softmac isn't the only wireless code that likes to be configured after going
> > up first. Configuring after the card goes up has generally been more
> > reliable, though that should not be necessary and is a bug IMHO.
>
> Ok, that's nice to know.
>
> > In order to scan, we need to have the radio on and we need to be able to send
> > and receive. What are you gonna turn off?
>
> The obvious route would be to power the card down, but come back up
> every two minutes to perform a scan, or if userspace explicitly requests
> one. Would this cause problems in some cases?
Seriously, having all these different capabilities when the card is
"down" is just madness. Down == Down!!! Furthermore, every card is
going to support some other subset of capabilities when it's "down".
When you bring "up" prism54 fullmac card, you have to power up the
hardware, reload the firmware, let the firmware boot, and then talk to
it. Doing that every 2 minutes is just a waste of time, effort, and
power.
If you want to scan, just bring the darn card up to do it. It's so much
simpler that way, and I just don't see what having all this "every 2
minutes do a scan" policy really buys us. That doesn't belong in the
kernel. If something wants to scan, userspace can wake the card up and
do the scan. It's userspace that's using the scan results to configure
the card anyway, so userspace can do the scan.
Simple == good. Down == down. Lets just agree on that and save
ourselves a lot of pain.
Dan
next prev parent reply other threads:[~2006-12-21 3:12 UTC|newest]
Thread overview: 122+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-12-19 18:52 Changes to sysfs PM layer break userspace Matthew Garrett
2006-12-19 19:34 ` Arjan van de Ven
2006-12-19 19:44 ` Matthew Garrett
2006-12-19 20:03 ` Arjan van de Ven
2006-12-19 20:08 ` Matthew Garrett
2006-12-19 20:23 ` Arjan van de Ven
2006-12-19 20:32 ` Matthew Garrett
2006-12-19 20:55 ` Arjan van de Ven
2006-12-21 0:08 ` Kyle Moffett
2006-12-19 21:34 ` David Brownell
2006-12-20 0:25 ` Matthew Garrett
2006-12-20 3:59 ` Changes to " David Brownell
2006-12-20 4:26 ` Matthew Garrett
2006-12-20 5:14 ` David Brownell
2006-12-20 5:34 ` Greg KH
2006-12-20 5:52 ` Matthew Garrett
2006-12-20 7:50 ` Arjan van de Ven
2006-12-20 12:53 ` Network drivers that don't suspend on interface down Matthew Garrett
2006-12-20 13:38 ` Arjan van de Ven
2006-12-20 14:31 ` Matthew Garrett
2006-12-20 15:51 ` Arjan van de Ven
2006-12-20 22:49 ` Stephen Hemminger
2006-12-20 23:37 ` Rick Jones
2006-12-19 23:51 ` Stephen Hemminger
2006-12-21 0:11 ` Francois Romieu
2006-12-20 0:26 ` Stephen Hemminger
2006-12-21 11:18 ` Francois Romieu
2006-12-21 1:12 ` Matthew Garrett
2006-12-21 2:05 ` Michael Wu
2006-12-21 2:18 ` Matthew Garrett
2006-12-21 2:38 ` Daniel Drake
2006-12-21 2:45 ` Matthew Garrett
2006-12-21 3:08 ` Daniel Drake
2006-12-21 3:25 ` Matthew Garrett
2006-12-21 3:37 ` Dan Williams
2006-12-21 3:29 ` Dan Williams
2006-12-21 3:14 ` Dan Williams [this message]
2006-12-21 13:14 ` jamal
2006-12-21 2:29 ` Daniel Drake
2006-12-21 2:10 ` Jesse Brandeburg
2006-12-21 8:54 ` Arjan van de Ven
2006-12-22 1:03 ` Herbert Xu
2006-12-23 8:54 ` Pavel Machek
2006-12-20 15:27 ` Olivier Galibert
2006-12-20 15:34 ` Arjan van de Ven
2006-12-20 16:40 ` Olivier Galibert
2006-12-20 17:21 ` Arjan van de Ven
2006-12-20 20:40 ` Benny Amorsen
2006-12-20 21:49 ` Arjan van de Ven
2006-12-20 21:15 ` Stefan Rompf
2006-12-20 14:00 ` Jiri Benc
2006-12-20 18:12 ` Dan Williams
2006-12-21 1:15 ` Matthew Garrett
2006-12-21 1:57 ` Michael Wu
2006-12-21 2:20 ` Matthew Garrett
2006-12-21 3:02 ` Dan Williams
2006-12-21 3:06 ` Dan Williams
2006-12-21 3:14 ` Matthew Garrett
2006-12-21 3:32 ` Dan Williams
2006-12-21 13:19 ` Sven-Haegar Koch
2006-12-21 17:16 ` Dan Williams
2006-12-21 18:27 ` Valdis.Kletnieks
2006-12-22 1:25 ` Matt Domsch
2006-12-20 16:04 ` Maciej W. Rozycki
2006-12-22 21:09 ` Changes to PM layer break userspace Pavel Machek
2006-12-24 7:02 ` David Brownell
2006-12-28 13:31 ` Alan
2006-12-28 16:04 ` Arjan van de Ven
2006-12-29 5:27 ` David Brownell
2006-12-20 2:15 ` Changes to sysfs " Andrew Morton
2006-12-20 2:35 ` Randy Dunlap
2006-12-20 3:49 ` Andrew Morton
2006-12-20 3:29 ` David Brownell
2006-12-21 3:51 ` Andrew Morton
2006-12-21 4:56 ` David Brownell
2006-12-21 5:02 ` Andrew Morton
2006-12-21 7:05 ` David Brownell
2006-12-21 8:27 ` Arjan van de Ven
2006-12-22 20:44 ` Pavel Machek
2006-12-23 14:02 ` Stefan Seyfried
2006-12-19 21:22 ` David Brownell
2006-12-19 22:57 ` Matthew Garrett
2006-12-19 23:36 ` Changes to " David Brownell
2006-12-20 0:09 ` Matthew Garrett
2006-12-20 3:19 ` David Brownell
2006-12-20 3:43 ` Matthew Garrett
2006-12-20 4:15 ` David Brownell
2006-12-20 4:56 ` [PATCH 1/2] Fix /sys/device/.../power/state Matthew Garrett
2006-12-20 21:18 ` David Brownell
2006-12-21 1:29 ` Matthew Garrett
2006-12-21 3:04 ` David Brownell
2006-12-21 4:06 ` Matthew Garrett
2006-12-21 4:51 ` David Brownell
2007-01-25 5:00 ` [PATCH] Fix /sys/device/.../power/state regression Matthew Garrett
2007-01-26 19:59 ` Andrew Morton
2007-01-26 20:42 ` Greg KH
2007-01-27 1:26 ` Matthew Garrett
2007-01-27 17:19 ` Pavel Machek
2007-01-26 20:41 ` Greg KH
2007-01-26 21:56 ` David Brownell
2007-01-26 22:19 ` Greg KH
2007-01-26 23:15 ` Matthew Garrett
2007-01-27 0:42 ` David Brownell
2007-01-27 0:56 ` Andrew Morton
2007-01-27 2:40 ` David Brownell
2007-01-27 17:38 ` Pavel Machek
2007-01-27 22:42 ` Matthew Garrett
2007-01-31 10:34 ` Pavel Machek
2007-01-27 1:19 ` Matthew Garrett
2007-01-27 3:02 ` David Brownell
2007-01-29 17:36 ` Stephen Hemminger
2007-01-27 13:17 ` Pavel Machek
2007-01-30 18:43 ` Eric Piel
2007-01-30 18:47 ` Oliver Neukum
2007-01-30 19:01 ` Eric Piel
2007-01-31 10:55 ` Jiri Kosina
2007-01-31 11:03 ` Oliver Neukum
2006-12-20 4:56 ` [PATCH 2/2] Update feature-removal-schedule.txt Matthew Garrett
2006-12-22 20:47 ` Changes to PM layer break userspace Pavel Machek
2006-12-21 5:25 Network drivers that don't suspend on interface down David Brownell
2006-12-21 7:08 ` Stephen Hemminger
2006-12-21 8:11 ` David Brownell
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