From: Pavel Machek <pavel@ucw.cz>
To: Oliver Neukum <oliver@neukum.org>
Cc: linux-kernel@vger.kernel.org
Subject: Re: error to be returned while suspended
Date: Thu, 5 Oct 2006 00:44:48 +0200 [thread overview]
Message-ID: <20061004224448.GL8440@elf.ucw.cz> (raw)
In-Reply-To: <200610041834.57639.oliver@neukum.org>
Hi!
> > > which error should a character device return if a read/write cannot be
> > > serviced because the device is suspended? Shouldn't there be an error
> > > code specific to that?
> >
> > If you are talking system suspend, then userspace should not run while
> > devices are suspended.
> >
> > If you are talking runtime suspend, you should probably just wake the
> > device up on first access.
>
> Do you really think a device driver should override an explicitely
> selected power state?
(So we are talking runtime suspend?)
No, I do not know what the right interface is. I started to suspect
that drivers should suspend/resume devices automatically, without
userland help. Maybe having autosuspend_timeout in sysfs is enough.
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
next prev parent reply other threads:[~2006-10-04 22:45 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-10-03 11:23 error to be returned while suspended Oliver Neukum
2006-10-03 12:51 ` linux-os (Dick Johnson)
2006-10-03 13:02 ` Oliver Neukum
2006-10-03 14:17 ` linux-os (Dick Johnson)
2006-10-04 11:19 ` Pavel Machek
2006-10-04 16:34 ` Oliver Neukum
2006-10-04 22:44 ` Pavel Machek [this message]
2006-10-05 7:07 ` Oliver Neukum
2006-10-05 8:57 ` Pavel Machek
2006-10-05 16:21 ` [linux-usb-devel] " Alan Stern
2006-10-05 16:35 ` Oliver Neukum
2006-10-05 18:24 ` Alan Stern
2006-10-05 18:43 ` Oliver Neukum
2006-10-05 20:48 ` Alan Stern
2006-10-05 21:25 ` Oliver Neukum
2006-10-05 21:45 ` Alan Stern
2006-10-06 7:21 ` Oliver Neukum
2006-10-06 17:48 ` Alan Stern
2006-10-06 11:25 ` Pavel Machek
2006-10-06 2:47 ` David Brownell
2006-10-06 7:04 ` Oliver Neukum
2006-10-06 11:27 ` Pavel Machek
2006-10-06 14:09 ` Oliver Neukum
2006-10-06 21:10 ` David Brownell
2006-10-07 10:49 ` Oliver Neukum
2006-10-07 11:08 ` Pavel Machek
2006-10-07 17:16 ` Oliver Neukum
2006-10-08 0:03 ` David Brownell
2006-10-08 2:03 ` Alan Stern
2006-10-08 7:07 ` Oliver Neukum
2006-10-08 14:27 ` Alan Stern
2006-10-08 19:36 ` Pavel Machek
2006-10-08 19:57 ` Oliver Neukum
2006-10-08 21:06 ` Pavel Machek
2006-10-08 6:40 ` Oliver Neukum
2006-10-09 15:56 ` David Brownell
2006-10-08 6:51 ` Oliver Neukum
2006-10-08 7:14 ` Oliver Neukum
2006-10-08 13:24 ` Oliver Neukum
2006-10-08 14:32 ` Alan Stern
2006-10-08 19:41 ` /sys/.../power/state " Pavel Machek
2006-10-08 19:19 ` Pavel Machek
[not found] ` <200610080838.03488.oliver@neukum.org>
[not found] ` <200610080020.49158.david-b@pacbell.net>
2006-10-08 8:39 ` Oliver Neukum
2006-10-08 14:16 ` Dmitry Torokhov
2006-10-06 11:23 ` Pavel Machek
2006-10-06 11:21 ` Pavel Machek
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