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This structure contains the fields necessary in order for the Bus driver to carry out an IsochFreeBandwidth request.
hBandwidthSpecifies the bandwidth handle to release.
nMaxBytesPerFrameRequestedfulSpeedBytesPerFrameAvailableSpeedSelectednBandwidthUnitsRequiredIf successful, the bus driver sets Irp->IoStatus.Status to STATUS_SUCCESS, and the isochronous bandwidth is returned to the pool of available bandwidth.
A status of STATUS_INVALID_GENERATION also indicates success.
Do not resend the REQUEST_ISOCH_FREE_BANDWIDTH request in order to release isochronous bandwidth if the request failed with the STATUS_INVALID_GENERATION error code. In that case, it is safe to assume that isochronous bandwidth was released as a result of 1394 bus generation changes.