linux-kernel - Re: Regression from 2.6.26: Hibernation (possibly suspend) broken on Toshiba R500 (bisected)

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Message-Id: <200812021649.27148.rjw@sisk.pl>
Date:	Tue, 2 Dec 2008 16:49:26 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Greg KH <greg@...ah.com>, Ingo Molnar <mingo@...e.hu>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Len Brown <lenb@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Takashi Iwai <tiwai@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: Regression from 2.6.26: Hibernation (possibly suspend) broken on Toshiba R500 (bisected)

On Tuesday, 2 of December 2008, Linus Torvalds wrote:
> 
> On Tue, 2 Dec 2008, Rafael J. Wysocki wrote:
> >  			r_size = resource_size(r);
> >  			/* For bridges size != alignment */
> > -			align = resource_alignment(r);
> > +			align = (i < PCI_BRIDGE_RESOURCES) ? r_size : r->start;
> 
> Hmm. This means that something set the alignment flags incorrectly. The 
> resource _should_ have IORESOURCE_SIZEALIGN set for a resource with size 
> alignment, and IORESOURCE_STARTALIGN for one that has start alignment.
> 
> Your patch doesn't fix anything, it just hides the bug.

Well, it's just a partial revert of commit
5f17cfce5776c566d64430f543a289e5cfa4538b ("PCI: fix pbus_size_mem() resource
alignment for CardBus controllers"). 

> It would be good to hear what resource this is, and where it got set. So 
> instead of that broken patch that just hides the problem, please try to 
> debug it with something like
> 
> 	resource_size_t expected_align;
> 
> 	expected_align = (i < PCI_BRIDGE_RESOURCES) ? r_size : r->start;
> 	align = resource_alignment(r);
> 	if (align != expected_align) {
> 		dev_warn(&dev->dev,
> 			"BAR %d %llx-%llx wrong alignment flags %lx %llx (%llx)\n",
> 			i,
> 			(unsigned long long) r->start,
> 			(unsigned long long) r->end,
> 			r->flags,
> 			(unsigned long long) align,
> 			(unsigned long long) expected_align);
> 		/* Hacky and wrong, but trying to keep things 
> 		align = expected_align;
> 	}
> 
> or something like that. And then we just need to figure out which setup 
> routine sets the wrong alignment flag,.

Yeah, I'll give it a try later today, when I get back from the Uni.

Thanks,
Rafael
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