linux-kernel - Re: Machine crashes right *after* ~successful resume

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Date:	Wed, 15 Oct 2014 11:39:17 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
Cc:	Wilmer van der Gaast <wilmer@...st.net>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Pavel Machek <pavel@....cz>,
	Rafael Wysocki <rafael.j.wysocki@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: Machine crashes right *after* ~successful resume

On Wed, Oct 15, 2014 at 6:58 AM, Bjorn Helgaas <bhelgaas@...gle.com> wrote:
> [+cc Yinghai, author of 928bea964827 ("PCI: Delay enabling bridges
> until they're needed")]
>
> On Wed, Oct 15, 2014 at 5:16 AM, Wilmer van der Gaast <wilmer@...st.net>
>> Not sure why 2e8b... was initially found guilty by git bisect, I fear
>> that my testing was not thorough enough. I've verified a couple of times
>> now that 928bea96... does cause crashes and the previous revision does not.

so third resume will not work? that is strange.
second and third should not use same code path...

>>
>> 928bea... seems to reshuffle PCI initialisation a little bit and has
>> caused more troubles, judging from a Google query for it. Some changes
>> were made already as a result, and this unfortunately makes a revert on
>> a later kernel tree (to see if that fixes the problem for me) much less
>> straight-forward. :-(
>
> More details (from initial post) here: http://roy.gaast.net/~wilmer/.lkml/

Please check if attached reverting patch would work on 3.17.

Yinghai

View attachment "revert_928bea9_from_3.17.patch" of type "text/x-patch" (7187 bytes)