linux-kernel - Re: ohci1394_dma=early crash since 2.6.32 (was Re: [Bug #14487] PANIC: early exception 08 rip 246:10 error ffffffff810251b5 cr2 0)

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Message-ID: <4B6A9DE6.6080501@gmail.com>
Date:	Thu, 04 Feb 2010 02:13:58 -0800
From:	"Justin P. Mattock" <justinmattock@...il.com>
To:	Jan Beulich <JBeulich@...ell.com>
CC:	Ingo Molnar <mingo@...e.hu>, Dan Carpenter <error27@...il.com>,
	bernhard.kaindl@....net, Thomas Gleixner <tglx@...utronix.de>,
	linux1394-devel@...ts.sourceforge.net,
	Stefan Richter <stefanr@...6.in-berlin.de>,
	Rafael Wysocki <rjw@...k.pl>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	ebiderman@...ssion.com, hpa@...or.com
Subject: Re: ohci1394_dma=early crash since 2.6.32 (was Re: [Bug		 #14487]
 PANIC: early exception 08 rip 246:10 error		 ffffffff810251b5 cr2 0)

On 02/04/10 01:57, Jan Beulich wrote:
>>>> "Justin P. Mattock"<justinmattock@...il.com>  04.02.10 10:48>>>
>> I see:
>>
>> ohci.registers = (void *)fix_to_virt(FIX_OHCI1394_BASE);
>>
>> then I think it calls:
>>
>> set_fixmap_nocache(FIX_OHCI1394_BASE, ohci_base);
>>
>> I'm guessing somewhere with the fix_to_virt might be something
>> (but could be wrong);
>
> No, it ought to be that set_fixmap_nocache().
>
> Jan
>
>


hmm..
as a quick test I did try:

set_fixmap(FIX_OHCI1394_BASE, ohci_base);
(maybe ohci_base)

which still hit, maybe something else
in the set of calls is hitting
i.g. address specific or something.
(I'll have to keep looking on this);

Justin P. mattock

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