Re: DRIVER vs. PHYSDEVDRIVER for block susbsystem

[Andrey Borzenkov <arvidjaar@mail.ru>]

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On Saturday 25 March 2006 21:50, Kay Sievers wrote:
> On Sat, Mar 25, 2006 at 09:24:30PM +0300, Andrey Borzenkov wrote:
> > The example persistent rules distributed with udev use DRIVER matching
> > for SUBSYSTEM=block. Unfortunately, it appears that DRIVER is simply not
> > defined in this case - it is fetched only for the case when devpath is
> > /devices/* not /block/*.
>
> No DRIVER matches up the whole chain of devices. But the driver value of
> block is "" which matches successfully the non-match of the values it is
> compared against.
>
> The rules have changed and should work that way:
>  
> http://www.kernel.org/git/?p=linux/hotplug/udev.git;a=blob;hb=HEAD;f=etc/ud
>ev/60-persistent-storage.rules
>

Those rules will never match for ide-cs or ide-floppy as intended (while this 
"fixes" it for ide-cdrom, sure :)

> We should not introduce any new users of the "device" link or the
> PHYSDEV* values, they will go away some day along with the odd idea
> to distinguish between class and physical devices.
>
> > Is DRIVER expected to be set for SUBSYSTEM=block (I will submit patch)?
> > Otherwise it would be nice to fix examples in rules.
>
> No, class devices don't have a driver for now.
>

In this case adding driver for block devices looks like the right thing, does 
not it? Strictly speaking, it could be generalized to "if device symlink 
exists, fetch driver from it"; this will go away when sysfs layout will have 
changed.
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