[pvrusb2] Segmentation fault when unloading module

[William Crowell]

Mike et al,

There are a lot of changes in the V4L in 2.6.18 starting with git6 and as late 
as git16. The stock msp3400 has been affected as well.

I submitted a set of bug reports to kernel.org and I made modifications to 
several drivers in 2.6.18-git14. The official fixes were in git16.

There is a shift in the PCI layer with additional exported symbols to identify 
various PCI issues.

We do all of this work, just to watch TV.

Cheers,

Bill

On Monday 02 October 2006 10:32, Mike Isely wrote:
> The bottom of that stack is the msp3400 module.  What happened here is
> that doing the unload naturally caused the pvrusb2 driver to unregister
> the I2C adapter instance, which then causes all associated I2C chip-level
> drivers to disassociate from the adapter.  When the msp3400 module tried
> to disassociate it triggered the fault.
>
> Can this be easily reproduced?
>
> I've seen this happen before, but I could only cause it to happen if I was
> using 2.6.15, and in that case the msp3400 module first had to fail during
> initialization typically resulting from mis-identifying a cx25840 as an
> msp3400.  I see here that you're pointing out an msp3400 failure before
> you attempt to unload.  Sounds like the same problem may unfortunately
> still be in that module :-(
>
>   -Mike

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William G. Crowell, VP & CTO
Crowell Systems
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