[vbox-dev] Fix to #13789

[a.urakov at drweb.com]

Diffs attached

30.01.2015 17:49, a.urakov at drweb.com пишет:
> Hello!
>
> We would like to contribute to VirtualBox under MIT license. We send 
> our changes to fix bug described at 
> https://www.virtualbox.org/ticket/13789 .
>
> The idea is that functions /Medium::removeRegistry()/ and 
> /Medium::addRegistry()/ themselves take write locks on mediums, so we 
> get read lock only for /Medium::getAnyMachineBackref()/ call in 
> /VirtualBox::unregisterMachine()/ function. Also we release read lock 
> on medium after we got its parent and before we are going to iterate 
> through parents in /Machine::detachAllMedia()/ function.
>
> Regards,
> Alexander
>

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