linux-kernel - Re: Help needed, Re: [Bug #14334] pcmcia suspend regression from 2.6.31.1 to 2.6.31.2

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Message-Id: <200910302132.44759.rjw@sisk.pl>
Date:	Fri, 30 Oct 2009 21:32:44 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	"Greg Kroah-Hartman" <gregkh@...e.de>,
	Jose Marino <braket@...mail.com>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Linux PCI <linux-pci@...r.kernel.org>,
	Dominik Brodowski <linux@...inikbrodowski.net>
Subject: Re: Help needed, Re: [Bug #14334] pcmcia suspend regression from 2.6.31.1 to 2.6.31.2 - Dell Inspiron 600m

On Friday 30 October 2009, Linus Torvalds wrote:
> 
> On Fri, 30 Oct 2009, Rafael J. Wysocki wrote:
> > 
> >
> > 1) Resume works if pcmcia_socket_dev_resume(dev) is moved to the "regular"
> >    resume phase, after resume_device_irqs().
> 
> Hmm. We really probably shouldn't call pcmcia_socket_dev_resume() in 
> early_resume. It takes mutexes etc, and it calls "socket_resume()", which 
> sleeps etc. That per se should be ok these days (since we don't actualyl 
> disable CPU irq's, just device irqs), but it also does that whole card 
> insertion events etc. And _that_ code I wouldn't trust at all.

I thought so when I worked on commit 0c570cdeb, but then it turned out to
work just fine with a number of boxes.

> The PCMCIA code is better than it used to be a long time ago, but some of 
> it is still pretty crazy. 
> 
> I get the feeling that we should just revert that commit 0c570cdeb,

Well, there's nothing wrong with doing the PCI stuff and restoring the state at
the _noirq stage IMO, so instead of reverting it altogether, I'd add
yenta_dev_suspend|resume() that would just call
pcmcia_socket_dev_suspend|resume() during "regular" suspend|resume.

> and instead always do PCMCIA suspend as a "eject" event. That way we have no 
> driver behind it to resume at resume time - and we'll see any plugged-in 
> device as just a new insertion. 

In fact I thought about that.

It looks like I need to find a CardBus adapter somewhere and clean that thing up.

That said, I'd really like to know what's going on in there. :-)

Thanks,
Rafael
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