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Re: Bug#345067: My understanding of the IDE mess, and why it does not make sense to apply the proposed patch

On Wed, Mar 08, 2006 at 10:35:38PM -0800, Jurij Smakov wrote:
> On Thu, 9 Mar 2006, Sven Luther wrote:

> >As quoted from http://wiki.debian.org/LinuxKernelIdeProblem, it is no clear
> >that ide-generic and via82cxxx to take only one example do exactly the same
> >thing, and there is no way both could be needed at the same time, and in 
> >fact
> >it is contrary, what do i say, anathema, to both the linux ide layer and 
> >the
> >yaird design document, to even imagine that.

> I've independently done the analysis of the IDE layer initialization and 
> can confirm the technical part of Sven's conclusion: ide-generic takes 
> over all hardware interfaces (hwifs), which do not have the 'present' flag 
> set in their corresponding entry in the ide_hwifs[] structure. Normally, 
> the native IDE drivers set this flag during their initialization (via82cxxx 
> does it through the chain of calls ide_setup_pci_device() -> 
> probe_hwif_init_with_fixup() -> hwif_init()). So, if ide-generic is loaded 
> last, it will pick up only the interfaces, which have not been claimed by 
> any native drivers, which is the desired result. Looking at the code I 
> cannot see how the native drivers can depend in any way on the ide-generic 
> being loaded before them.

What version of the kernel was this analysis done with?  The workaround in
yaird is explicitly commented as existing for the benefit of older kernel
versions; can you assure us that this aspect of the driver design is
unchanged from 2.6.8 through 2.6.15?

Steve Langasek                   Give me a lever long enough and a Free OS
Debian Developer                   to set it on, and I can move the world.
vorlon@debian.org                                   http://www.debian.org/

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