- Split buffers on page to prevent non-contiguous memory being passed to driver.
- Protect CIrpQueue::GetMappingWithTag, ReleaseMappingWithTag with spinlock to prevent race conditions
(GetMapping, ReleaseMapping do not need spinlock, they are only called from a service routine).
- Remove ASSERT in CIrpQueue::ReleaseMappingWithTag, when mappings are released out of order. Just ignore
the tag argument and release the next one in the list. This is what windows does, confirmed by calling
PortWavePciStream::ReleaseMapping() with tag argument set to 0, absolutly no difference observed.
Allowing out of order release is essential given that a driver is not permitted to hold a spinlock when calling
ReleaseMapping().
- Remove IIrpQueue::HasLastMappingFailed(), it never worked and there is no way it could work.
CPortPinWavePci::HandleKsStream() call MappingAvailable() non-conditionally, this is what Windows does,
verified by debug prints in ac97 driver.
- Implement CIrpQueue::NumData().
- Remove incorrect interlocked operations/volatile variables and several (now unused) class fields.