linux-kernel - Re: [linux-pm] [2.6.30-rc1-git2 regressions] Hibernation broken and (minor but annoying) audio problem

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Message-ID: <49DFF837.9080009@linux.intel.com>
Date:	Fri, 10 Apr 2009 18:53:59 -0700
From:	Arjan van de Ven <arjan@...ux.intel.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	"Rafael J. Wysocki" <rjw@...k.pl>,
	linux-pm@...ts.linux-foundation.org, Takashi Iwai <tiwai@...e.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [linux-pm] [2.6.30-rc1-git2 regressions] Hibernation broken and
 (minor but annoying) audio problem

Linus Torvalds wrote:
> 
> On Fri, 10 Apr 2009, Rafael J. Wysocki wrote:
>> I've just verified that the resume-after-hibernation issue goes away after
>> reverting commit 9710794383ee5008d67f1a6613a4717bf6de47bc
>> (async: remove the temporary (2.6.29) "async is off by default" code) , so it
>> is async-related.
> 
> Arjan? Clearly all the necessary fixes weren't found..
> 
> There _is_ a module loading problem wrt initmem - I think you found that 
> and we added a hack for it for the ACPI battery driver. I wonder if we're 
> hitting a similar issue now with module discovery: modules that use 
> "async_schedule()" to do their discovery asynchronously are now not 
> necessarily fully "done" when the module is loaded. 

this is both a "yes and no" kind of thing. It already happened for many cases
(USB, SCSI (and thus libata) etc) but now it can happen for more new cases.


> And so, anything that expected the devices to be available after module 
> load (like they used to) would be screwed.
> 
> IOW, maybe something like the totally untested patch appended here (that 
> should also allow us to make the ACPI battery code to go back to using 
> __init).
> 

this will work. It's a tad unfortunate that we basically end up synchronizing
at load time; maybe some time in the future we can make this opt-in/out ;-(
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