Re: [PATCH] PM: acquire device locks prior to suspending

Alan Stern
2007-12-13T16:02:36Z

On Wed, 12 Dec 2007, Andrew Morton wrote:

> On Fri, 21 Sep 2007 15:37:40 -0400 (EDT) Alan Stern <stern@rowland.harvard.edu> wrote:
>
> > This patch (as994) reorganizes the way suspend and resume
> > notifications are sent to drivers. The major changes are that now the
> > PM core acquires every device semaphore before calling the methods,
> > and calls to device_add() during suspends will fail.
>
> Causes my t61p to deadlock during suspend-to-RAM. Really late - the little
> moon symbol has started to flash but the LCD is still powered and the
> cursor still blinks. Only a poweroff restores control.

Is there any chance of debugging this? You have removed the patch from
the current -mm source. Does anybody else report a similar problem?

Proper debugging would require, to begin with, enabling
CONFIG_PM_VERBOSE and booting with no_console_suspend.

Alan Stern