Re: [Xenomai-core] rtdm_dev_register oops

[Jan Kiszka <jan.kiszka@domain.hid>]

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Stefan Kisdaroczi wrote:
> Am 18.05.2010 13:03, schrieb Jan Kiszka:
>> Stefan Kisdaroczi wrote:
>>> hi,
>>>
>>> i got a exception in rtdm_dev_register(). I didnt call rtdm_dev_unregister in my driver
>>> and after insmodding the module again I got a oops.
>> And that is surprising to you? :)
> 
> A bit.
> 
>> If you leave the previous device registered on rmmod, oopses are
>> programmed to occur: You leave references to unallocated memory behind.
> 
> If one device fails to unregister i can't register any other device anymore,

Then you have to find the bug that prevents proper deregistration.

> the rtdm registry is broken (cat /proc/xenomai/rtdm/names_devices hangs).

That hanging of /proc output is fixed in a series of mine that is yet
unmerged (as it is on hold, waiting for /proc infrastructure
refactorings by Philippe).

> That was surprising. If I have one corrupt file on my disk i can still
> create/access other files or list the filenames without exception.

If your filesystem hangs due to some bug of its own or in the underlying
layers, you won't be able to touch any further file on that system as well.

> 
> Please don't get me wrong, but its not obvious for me that a registry
> behaves like that, but i can life with it. Sorry for the noise.

Again, the problem is that the deregistration hangs. That needs to be
understood and resolved.

Jan


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