PRB: Bandwidth Leak of USB Device on Surprise Removal (264946)


The information in this article applies to:

  • Microsoft Windows 2000 Server
  • Microsoft Windows 2000 Advanced Server
  • Microsoft Windows 2000 Professional
  • Microsoft Windows 98
This article was previously published under Q264946

SYMPTOMS

Universal serial bus (USB) audio and video stream devices may not work if you surprise-remove the device while the application is using the device, and then plug the device back in.

CAUSE

The USB hub driver in Windows 2000 releases bandwidth only on IRP_MN_REMOVE_DEVICE IRP, not on IRP_MN_SURPRISE_REMOVAL.

Therefore, when a USB device is surprise-removed and if the application has a handle to the device open, the system will not send an IRP_MN_REMOVE_DEVICE until the handle is closed. As a result, the bandwidth is not released. If you plug the device back in again, the device will not work because the system will not be able to release enough bandwidth.

RESOLUTION

To work around this problem, either exit the application that is using the device, or restart the system.
Modification Type:MinorLast Reviewed:12/20/2004
Keywords:kbprb kbUSB KB264946
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