[wdmaudiodev] problems with additional DeviceObject
- From: Markus Bollinger <markusbollinger@xxxxxxxx>
- To: wdmaudiodev@xxxxxxxxxxxxx
- Date: Wed, 14 Jan 2004 09:59:08 -0800 (PST)
Hello!
In my driver (a WavePci audio driver) I use an
additional DeviceObject with a SymbolicLink to access
the driver directly via DeviceIoControl.
To do this I create Wrappers for IRP_MJ_CREATE,
IRP_MJ_CLOSE and IRP_MJ_DEVICE_CONTROL and replace it
with the functions initialised by PortClass.
When the DeviceObject is NOT the additional, I call
the original functions,
otherwise I work on my additional Device.
This works fine until I disable the card in the
"Device Manager":
In the Destructor of the AdapterCommon (which seems to
be called in IRP_MN_REMOVE_DEVICE) I do
STATUS_DELETE_PENDING for all chained IRP's,
IoDeleteSymbolicLink and IoDeleteDevice for my
additional device, but the driver gets not
unloaded from memory when a handle was open on the
SymbolicLink.
Next time I enable the card in the "Device Manager" I
have a UNEXPECTED_KERNEL_MODE_TRAP (with P1=8 double
fault).
When I close my application which has a handle un the
additional device before I disable the card, no
problem, the driver gets out of memory.
Any ideas ?
By the way, is it a problem with WHQL to have an
additional device ?
Markus
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