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From: Nigel Cunningham <ncunningham@crca.org.au>
To: Alan Stern <stern@rowland.harvard.edu>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	"Rafael J. Wysocki" <rjw@sisk.pl>,
	pm list <linux-pm@lists.linux-foundation.org>,
	ACPI Devel Maling List <linux-acpi@vger.kernel.org>,
	Greg KH <greg@kroah.com>, Len Brown <lenb@kernel.org>,
	LKML <linux-kernel@vger.kernel.org>,
	Alexey Starikovskiy <astarikovskiy@suse.de>,
	David Brownell <david-b@pacbell.net>, Pavel Machek <pavel@ucw.cz>,
	Oliver Neukum <oliver@neukum.org>
Subject: Re: [RFC][PATCH] PM: Introduce new top level suspend and hibernation callbacks (rev. 6)
Date: Wed, 02 Apr 2008 06:34:27 +1100	[thread overview]
Message-ID: <1207078467.23143.96.camel@nigel-laptop> (raw)
In-Reply-To: <Pine.LNX.4.44L0.0804011029010.3993-100000@iolanthe.rowland.org>

Hi.

On Tue, 2008-04-01 at 10:31 -0400, Alan Stern wrote:
> On Tue, 1 Apr 2008, Benjamin Herrenschmidt wrote:
> 
> > On Tue, 2008-04-01 at 19:15 +1100, Nigel Cunningham wrote:
> > > > + *   However, drivers may NOT assume anything about the availability of the
> > > > + *   user space at that time and it is not correct to request firmware from
> > > > + *   within @prepare() (it's too late to do that).
> > > 
> > > That doesn't sound good. It would be good to be able to get drivers to
> > > request firmware early in the process.
> > 
> > Agreed. Prepare() should still allow request_firmware and full userspace
> > communication / helper usage.
> 
> Pepare() is called after userspace has been frozen.  (Of course, once 
> the freezer goes away this won't matter any more.)
> 
> There is a separate notifier chain which drivers can subscribe to;
> notifications about impending sleeps are sent out while userspace is
> still alive.  Drivers can use that for request_firmware, memory
> allocation, and other things.

Then that should be mentioned here so that drivers authors can know that
it is possible to request firmware, allocate memory and so on at a stage
when you can still rely on userspace being alive.

Regards,

Nigel


  reply	other threads:[~2008-04-01 19:34 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-03-29 22:17 [RFC][PATCH 0/3] PM: Rework suspend and hibernation code for devices (rev. 3) Rafael J. Wysocki
2008-03-29 22:20 ` [RFC][PATCH 1/3] PM: Introduce new top level suspend and hibernation callbacks (rev. 5) Rafael J. Wysocki
2008-03-30  2:54   ` Rafael J. Wysocki
2008-03-31 21:29     ` [RFC][PATCH] PM: Introduce new top level suspend and hibernation callbacks (rev. 6) Rafael J. Wysocki
2008-04-01  8:15       ` Nigel Cunningham
2008-04-01  8:27         ` Benjamin Herrenschmidt
2008-04-01 14:31           ` Alan Stern
2008-04-01 19:34             ` Nigel Cunningham [this message]
2008-04-01 20:16           ` Rafael J. Wysocki
2008-04-01 20:12         ` Rafael J. Wysocki
2008-04-01 20:56           ` Alan Stern
2008-04-01 21:38             ` Nigel Cunningham
2008-04-01 21:59               ` Rafael J. Wysocki
2008-04-01 21:50             ` Rafael J. Wysocki
2008-04-02 14:11               ` Alan Stern
2008-04-02 14:22                 ` Oliver Neukum
2008-04-02 15:13                   ` Alan Stern
2008-04-02 15:28                     ` Oliver Neukum
2008-04-02 16:42                       ` Alan Stern
2008-04-02 20:11                         ` Oliver Neukum
2008-04-02 20:28                           ` Alan Stern
2008-04-01 21:35           ` Nigel Cunningham
2008-04-01 21:57             ` Rafael J. Wysocki
2008-04-01 22:32               ` Nigel Cunningham
2008-04-01 23:00                 ` Rafael J. Wysocki
2008-04-01  8:37       ` Pavel Machek
2008-04-01 20:23         ` Rafael J. Wysocki
2008-03-29 22:22 ` [RFC][PATCH 2/3] PM: New suspend and hibernation callbacks for platform bus type (rev. 3) Rafael J. Wysocki
2008-03-30  2:56   ` Rafael J. Wysocki
2008-03-29 22:23 ` [RFC][PATCH 3/3] PM: New suspend and hibernation callbacks for PCI " Rafael J. Wysocki

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