Re: [PLUG] cdrom mounting

[Will Dyson <will_dyson@pobox.com>]

Arthur S. Alexion wrote:
> Looks like modprobe choked on me. Here's the output:
>
> [root@pcp01425459pcs dev]# modprobe ide-cd
> /lib/modules/2.4.7-10/kernel/drivers/ide/ide-cd.o: unresolved symbol 
> unregister_cdrom_R94f2f104

[snip]

> I figure I should fix this before I play with anything more advanced.
>
> How do I fix this driver problem?  (BTW, this is a lot of help and I 
> really appreciate it.)

Hmm. Thats interesting.

See how all the symobls have a string of gibberish at the end? That shows 
that something called 'modversions' was enabled when this module was built 
(as redhat cusomarily does for their kernels).

Modversions attempts to prevent problems where a module is compiled for 
one kernel, but used in different kernel where the interface has changed. 
It does this by making a checksum of the functions involved, and appending 
this checksum to the symbol names. That way, if the function that the 
symbol comes from changes, the module will no longer be loadable (because 
the symbol name in the kernel will differ from that in the module).

Of course, the module is also unloadable if the module uses modversion, 
but the kernel doesn't.

I can't imagine how either of these situations could have arisen in an 
offical redhat kernel. Try something for me: run the following command and 
tell us the output

	grep 'unregister_cdrom' /proc/ksyms

Also, the output of

	uname -a

might be helpful. In any case, I suspect that the solution is to get a new 
kernel RPM and install it.

--
Will Dyson
"Back off man, I'm a scientist!" -Dr. Peter Venkman


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