linux-kernel - Re: [linux-pm] [PATCH] Remove process freezer from suspend to RAM pathway

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Message-Id: <E1I63Nv-0006Z9-00@dorka.pomaz.szeredi.hu>
Date:	Wed, 04 Jul 2007 13:51:03 +0200
From:	Miklos Szeredi <miklos@...redi.hu>
To:	rjw@...k.pl
CC:	paulus@...ba.org, mjg59@...f.ucam.org,
	linux-pm@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [linux-pm] [PATCH] Remove process freezer from suspend to RAM pathway

> Still, my position is this:
> 
> 1) The freezer (in the modified form, with the freezing of kernel threads
> limited to the ones that want to be frozen) is needed for hibernation.
> 
> 2) The freezer is generally not needed for suspend, _but_ there are drivers
> in the tree that rely on it being used.  Thus, at some point in time we can
> remove the freezer from the suspend code path, _but_ no sooner than we are
> sure that the majority of drivers is prepared for that.

And we won't know if drivers are OK until we remove the freezer,
catch-22.

So I think we need to disable the freezer at least in -mm and/or
optionally in -linus.

I applied Matthew's patch, and suspend did in fact stop working
(thinkpad t60), but there was nothing catastrophic.  Here's the dmesg
if somebody is interested:

Suspending console(s)
usb_endpoint usbdev5.3_ep83: PM: suspend 0->2, parent 5-2:1.0 already 2
usb_endpoint usbdev5.3_ep02: PM: suspend 0->2, parent 5-2:1.0 already 2
usb_endpoint usbdev5.3_ep81: PM: suspend 0->2, parent 5-2:1.0 already 2
hub 2-0:1.0: suspend error -16
suspend_device(): usb_suspend+0x0/0x1c() returns -16
Could not suspend device usb2: error -16
usb_endpoint usbdev5.3_ep81: PM: resume from 0, parent 5-2:1.0 still 2
usb_endpoint usbdev5.3_ep02: PM: resume from 0, parent 5-2:1.0 still 2
usb_endpoint usbdev5.3_ep83: PM: resume from 0, parent 5-2:1.0 still 2
Some devices failed to suspend

Miklos
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