Re: Linux IDE bug in 2.4.21 and 2.4.22 ?

[Phil Dibowitz <phil@ipom.com>]

Bartlomiej Zolnierkiewicz wrote:
> On Tuesday 09 of September 2003 00:51, Phil Dibowitz wrote:
> 
>>Hey folks,
>>
>>I think I may have found a bug in the Linux IDE subsystem
>>introduced in 2.4.21 and still present in 2.4.22.
> 
> 
> Nope, user error :-).

I thought there was a reasonable chance of that! =)

> Nope, your CMD649 was handled by generic PCI IDE driver.

Ah, OK. Makes sense.

>>As of 2.4.21, this configuration no longer works -- which is not
>>necessarily a bug. I'm almost there, stay with me. =)
> 
> Assumption that current .config will work with future kernel versions is *false*.

Agreed. I said that wasn't a bug. =)

> Just add these two lines to your .config:
> CONFIG_BLK_DEV_VIA82CXXX=y
> CONFIG_BLK_DEV_CMD64X=y

Doh!! Didn't see the VIA driver down there at the bottom. Double doh! My 
appologies, I should have been able to figure that out.

That works quite well, thank you! Still have a question though...

> Your VIA IDE controller was handled by generic IDE chipset driver which
> did probe devices *after* PCI controllers are probed, so CMD649 took
> ide0 and ide1 first.

But, what about the case when I built in the generic driver, but made 
the CMD649 driver a module, and loaded it after boot. That shouldn't 
have *changed* what ide0 and ide1 are, right? I had ide0 and ide1 
assigned, did a modprobe, and CMD649 changed what ide0 adn ide1 where, 
and then forgot about the previous ones.. like all of a sudden it told 
the generic driver "no, no, you were wrong, there's no VIA chipset here, 
go back to sleep."

I may well be misunderstanding something precedence in the kernel here, 
but I figured while I'm bugging you, I might as well get the full picture.

Thanks for your time!
-- 
Phil Dibowitz                             phil@ipom.com
Freeware and Technical Pages              Insanity Palace of Metallica
http://www.phildev.net/                   http://www.ipom.com/

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