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For cases when the mailbox background operation is not complete, do not "handle" the interrupt, as it was not from this device. And furthermore there are no racy scenarios such as the hw being out of sync with the driver and starting a new background op behind its back. Reported-by: Jonathan Cameron <Jonathan.Cameron@Huawei.com> Fixes: ccadf1310fb (cxl/mbox: Add background cmd handling machinery) Signed-off-by: Davidlohr Bueso <dave@stgolabs.net> Reviewed-by: Dave Jiang <dave.jiang@intel.com> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Link: https://lore.kernel.org/r/20230612181038.14421-2-dave@stgolabs.net Signed-off-by: Dan Williams <dan.j.williams@intel.com>