linux-kernel - Re: [Bug 41722] Clevo M5X0JE hangs in ACPI init

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Mon, 9 Jan 2012 11:22:07 -0800
From:	Jesse Barnes <jbarnes@...tuousgeek.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Rogério Brito <rbrito@....usp.br>,
	bugzilla-daemon@...zilla.kernel.org,
	Edward Donovan <edward.donovan@...ble.net>,
	Thomas Gleixner <tglx@...utronix.de>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	linux-kernel@...r.kernel.org,
	Márcia Coutinho de Brito 
	<mcbrito@...il.com>, Yinghai Lu <yinghai@...nel.org>,
	Ram Pai <linuxram@...ibm.com>
Subject: Re: [Bug 41722] Clevo M5X0JE hangs in ACPI init

On Sun, 8 Jan 2012 14:23:29 -0800
Linus Torvalds <torvalds@...ux-foundation.org> wrote:

> On Sun, Jan 8, 2012 at 2:13 PM, Rogério Brito <rbrito@....usp.br> wrote:
> >
> > It doesn't boot with a vanilla kernel. It only boots when I pass the options
> > above *and* compile the kernel with the following patch applied:
> >
> > ,----[ do_not_size_subtractive_decoding_transparent_pci_to_pci_bridges.patch ]
> > | diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
> > | index 86b69f85..84543f5 100644
> > | --- a/drivers/pci/setup-bus.c
> > | +++ b/drivers/pci/setup-bus.c
> > | @@ -849,6 +849,10 @@ void __ref __pci_bus_size_bridges(struct pci_bus *bus,
> > |               break;
> > |
> > |       case PCI_CLASS_BRIDGE_PCI:
> > | +             /* don't size subtractive decoding (transparent)
> > | +              * PCI-to-PCI bridges */
> > | +             if (bus->self->transparent)
> > | +                     break;
> > |               pci_bridge_check_ranges(bus);
> > |               if (bus->self->is_hotplug_bridge) {
> > |                       additional_io_size  = pci_hotplug_io_size;
> > `----
> 
> Ahh. I'd forgotten about that particular PCI patch.
> 
> That is definitely the right thing to do, and commit 8fa5913d54f3
> ("PCI: remove transparent bridge sizing") did exactly that, but then
> we reverted it in commit 12c22d6ef299 because it caused some odd
> problems for some people.
> 
> I think we should try to re-do that "avoid sizing transparent bridges"
> commit, because it really should make it much easier to do PCI
> allocations under some very common situations (there's a *lot* of
> common intel transparent PCI bridges).
> 
> Jesse, Yinghai, Ram - should we try to just re-do that commit in this
> merge window, and see how that goes? We can always revert it again if
> it causes problems..

I don't remember what problems we hit, but if Ram and Yinghai are
willing to take a look at them we should go ahead and try again.

Thanks,
-- 
Jesse Barnes, Intel Open Source Technology Center

Download attachment "signature.asc" of type "application/pgp-signature" (837 bytes)