[Qemu-devel] Re: [PATCH 7/8] Introduce reset notifier order

[Jan Kiszka <jan.kiszka@web.de>]

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Paul Brook wrote:
> On Friday 01 May 2009, Jan Kiszka wrote:
>> Add the parameter 'order' to qemu_register_reset and sort callbacks on
>> registration. On system reset, callbacks with lower order will be
>> invoked before those with higher order. Update all existing users to the
>> standard order 0.
>>
>> Note: At least for x86, the existing users seem to assume that handlers
>> are called in their registration order. Therefore, the patch preserves
>> this property. If someone feels bored, (s)he could try to identify this
>> dependency and express it properly on callback registration.
> 
> Why do we need this? Why isn't creation order good enough?

At latest when properly deregistering reset handlers again on device
unplug, the registration order is no longer a static thing, manifested
in the code organization - which can also break due to refactoring, BTW.

Jan


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