linux-kernel - Re: [PATCH] ata: uncomment ata_timing for XFER_PIO

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Message-ID: <50CB116D.7050701@openvz.org>
Date:	Fri, 14 Dec 2012 15:45:49 +0400
From:	Konstantin Khlebnikov <khlebnikov@...nvz.org>
To:	Borislav Petkov <bp@...en8.de>, linux-kernel@...r.kernel.org,
	Jeff Garzik <jgarzik@...hat.com>
CC:	Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: [PATCH] ata: uncomment ata_timing for XFER_PIO_SLOW

Borislav Petkov wrote:
> On Fri, Dec 14, 2012 at 03:01:37PM +0400, Konstantin Khlebnikov wrote:
>> This patch uncomments ata timings for XFER_PIO_SLOW,
>> otherwise ata_timing_find_mode() returns NULL and kernel crashes in
>> pacpi_set_dmamode() after null-pointer dereference.
>>
>> The same problem was mentioned recently in debug patch v3.7-rc5-72-gcd705d5
>> ("libata debugging: Warn when unable to find timing descriptor based on xfer_mode")
>>
>> I'm not sure about this patch, because I have no idea what this XFER_PIO_SLOW
>
> No, this is already fixed by:
>
>
> Btw, this patch will go to stable since I can't find it in 3.7, I'm
> guessing Jeff will send it to Linus soonish since it is in his NEXT
> branch.
>
> Until that happens, you could test 3.7 by cherrypicking the patch above
> ontop of it or by simply applying it by hand since it is only two lines.
>
> Or, you could wait and test -rc1 when it comes out after the world ends :-).

Ah, thanks. Sorry for noise. I'll check this again in current linux-next.

>
>> means and why this bug so rare (3 times during 4 days boot-reboot test) I caught
>> this on completely ordinary PC with nvidia MCP61 chipset, sata hdd and ide dvd-rom.
>>
>> Signed-off-by: Konstantin Khlebnikov<khlebnikov@...nvz.org>
>> Signed-off-by: Borislav Petkov<bp@...en8.de>
>> Signed-off-by: Jeff Garzik<jgarzik@...hat.com>
>
> Btw, just FYI, this is not how S-o-b chaining works. Take a look
> at<Documentation/SubmittingPatches>  for details on how it is done
> correctly.

ouch :facepalm: how I missed this... just copy-paste error. sorry again.

>
> HTH.
>

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