[wdmaudiodev] Re: PortCls does not revoke mappings before hibernation
- From: Eugene Muzychenko <eugene@xxxxxxxxxxxxxx>
- To: Jeff Pages <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Fri, 22 Oct 2010 10:55:36 +0700
Hello Jeff,
> // released or revoked, except when going to sleep. To handle this case,
> // we firstly terminate any DMA activity on the stream and then release
> // any mappings from the released queue. Any mappings in the waiting
> // queue are kept for use when reawakened.
I'm afraid such behavior could be incorrect. During normal system
operation, you cannot leave acquired mappings in a queue because
PortCls automatically revokes all of them when a stream state is
switched to KSSTATE_STOP. So most likely it's a PortCls bug and it
should revoke all mappings during preparations to sleep/hibernation
states.
Regards,
Eugene
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