linux-kernel - Re: Patch "USB: Work around BIOS bugs by quiescing USB controllers earlier" causes MCEs

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Date:	Tue, 6 Oct 2009 06:44:01 +0200
From:	Nick Piggin <npiggin@...e.de>
To:	Mikael Pettersson <mikpe@...uu.se>
Cc:	David Woodhouse <dwmw2@...radead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Patch "USB: Work around BIOS bugs by quiescing USB controllers earlier" causes MCEs

On Fri, Oct 02, 2009 at 09:28:32PM +0200, Mikael Pettersson wrote:
> Mikael Pettersson writes:
>  > Nick Piggin writes:
>  >  > Hi,
>  >  > 
>  >  > Your patch db8be50c4307dac2b37305fc59c8dc0f978d09ea is causing my
>  >  > ia64 Altix system to die with an MCE in early boot.
>  > 
>  > The same commit has been confirmed by two people on the ARM list
>  > to cause boot failures on two different Intel XScale IOP machines.
>  > The machines have serial consoles, but only show
>  > 
>  > Uncompressing Linux... done. Booting the kernel.
>  > 
>  > before they hang.
> 
> I've just investigated this on one of my ARM boxes that this commit kills.
> 
> The commit changed quirk_usb_early_handoff to be a FIXUP_HEADER, which
> caused it to be invoked during the early stages of the platform's PCI
> init (arch/arm/kernel/bios32.c). quirk_usb_handoff_uhci() gets a bogus
> I/O base address, passes that down to uhci_reset_hc(), causing a kernel
> page fault in the first "outw(UHCI_USBCMD_HCRESET, base + UHCI_USBCMD);",
> causing the kernel to oops.
> 
> (All this occurs before the serial console works, so I had to add a
> platform-specific puts() and lots of tracing statements.)
> 
> Changing this quirk back to a FIXUP_FINAL allows the platform's PCI
> init to complete. Later on the generic pci_init() calls the quirk,
> which now gets the correct I/O base address, and the outw()s in
> uhci_reset_hc() don't fail.

Thanks for this, I guess we await David's response.
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