linux-kernel - Re: [Bug 10030] Suspend doesn't work when SD card is inserted

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Date:	Wed, 20 Feb 2008 21:58:07 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Pierre Ossman <drzeus-mmc@...eus.cx>
Cc:	Alan Stern <stern@...land.harvard.edu>,
	Zdenek Kabelac <zdenek.kabelac@...il.com>,
	Kernel development list <linux-kernel@...r.kernel.org>
Subject: Re: [Bug 10030] Suspend doesn't work when SD card is inserted

On Wednesday, 20 of February 2008, Pierre Ossman wrote:
> On Wed, 20 Feb 2008 14:26:16 -0500 (EST)
> Alan Stern <stern@...land.harvard.edu> wrote:
> 
> > 
> > Do I understand this correctly?  You've got special handling for the 
> > case where a bus handler doesn't have a resume routine, but no special 
> > handling for the case where it doesn't have a suspend routine?
> 
> Hmm... There should be checks for both, but the code seems to suggest otherwise.
> 
> > Why bother to remove the device if neither routine exists (there won't be 
> > any need to revive it since the bus never got suspended)?
> 
> The bus always gets suspended. The checks are to determine if state is saved or not. If it isn't, then a suspend/resume is treated as a removal/insertion.
> 
> > And why not simply fail the suspend if the resume routine doesn't exist
> > and the suspend routine does?  Maybe with an error message in the
> > system log.
> 
> For the asymmetric case, I guess that would do. But I still want to remove devices when the bus handler has no suspend handling.

I think I know how to handle that, but there's a more urgent issue I need to
fix first.  Stay tuned. :-)

Thanks,
Rafael
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