Why could this code crash with "IRQL_NOT..."?
NTSTATUS USBBase::StartDataUrb(IN UCHAR data[4])
{
NTSTATUS status = STATUS_SUCCESS;
// Initialize the URB we use for writing the pipe
PURB urb = this->DataUrbMidi01;
USBD_PIPE_HANDLE Handle = this->MidiOut01;
ULONG urbflags = USBD_SHORT_TRANSFER_OK;
ULONG size = 4;
PUCHAR Data = data;
if (this->FirstStart) {
Data = ACTIVATION;
this->FirstStart = FALSE;
}
UsbBuildInterruptOrBulkTransferRequest(urb, sizeof
(_URB_BULK_OR_INTERRUPT_TRANSFER),
Handle, Data, NULL, size, urbflags, NULL);
PIRP Irp = this->DataIrpMidi01;
PIO_STACK_LOCATION stack =
IoGetNextIrpStackLocation(Irp);
stack->MajorFunction =
IRP_MJ_INTERNAL_DEVICE_CONTROL;
stack->Parameters.DeviceIoControl.IoControlCode =
IOCTL_INTERNAL_USB_SUBMIT_URB;
stack->Parameters.Others.Argument1 = (PVOID) urb;
Irp->Cancel = FALSE;
ASSERT(KeGetCurrentIrql() <= DISPATCH_LEVEL);
status = IoCallDriver(lowerDO, Irp);
!!! At this point!!!
return status;
}
Because of debug messages (code is deleted here) I know
the moment of system crash. It has to be somewhere in or
slightly after IoCallDriver(...). The routine is called
at passive level.
I'm thankfull for any suggestions.
