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

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Date:	Wed, 4 Jul 2007 11:42:03 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Paul Mackerras <paulus@...ba.org>
cc:	Miklos Szeredi <miklos@...redi.hu>, <rjw@...k.pl>,
	<mjg59@...f.ucam.org>,
	Linux-pm mailing list <linux-pm@...ts.linux-foundation.org>,
	Kernel development list <linux-kernel@...r.kernel.org>
Subject: Re: [linux-pm] [PATCH] Remove process freezer from suspend to RAM
 pathway

On Wed, 4 Jul 2007, Miklos Szeredi wrote:

> 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

Remember what I wrote a few minutes ago about khubd and ksuspend_usbd
wanting to resume devices during a system suspend transition?  This is
exactly what happens when those threads aren't frozen.

Alan Stern

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