Hello!
I have been playing around with the usbsamp KMDF sample application and I have a question. What is the expected behavior when unplugging my USB device?
When I unplug my device now an assert in UsbSamp_EvtDeviceReleaseHardware() fails:
status = WdfUsbTargetDeviceSelectConfig(pDeviceContext->WdfUsbTargetDevice,
WDF_NO_OBJECT_ATTRIBUTES,
&configParams);
ASSERT(NT_SUCCESS(status));
The value of status after unplugging the device is STATUS_DEVICE_POWER_FAILURE (0xC000009D). Is this to be expected? Or is my device (or code) misbehaving?
Regards,
Mattias
The ASSERT is incorrect and should be removed, I will have the sample updated. Deconfiguring the device during ReleaseHardware has questionable value to begin with in my opinion, you could easily get rid of the WdfUsbTargetDeviceSelectConfig in this callback.
d
-----Original Message-----
From: xxxxx@lists.osr.com [mailto:xxxxx@lists.osr.com] On Behalf Of Mattias Br?ndstr?m
Sent: Thursday, October 25, 2007 7:35 AM
To: Windows System Software Devs Interest List
Subject: [ntdev] usbsamp, EvtDeviceReleaseHardware
Hello!
I have been playing around with the usbsamp KMDF sample application and I have a question. What is the expected behavior when unplugging my USB device?
When I unplug my device now an assert in UsbSamp_EvtDeviceReleaseHardware() fails:
status = WdfUsbTargetDeviceSelectConfig(pDeviceContext->WdfUsbTargetDevice,
WDF_NO_OBJECT_ATTRIBUTES,
&configParams);
ASSERT(NT_SUCCESS(status));
The value of status after unplugging the device is STATUS_DEVICE_POWER_FAILURE (0xC000009D). Is this to be expected? Or is my device (or code) misbehaving?
Regards,
Mattias
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