cmd646: allow MRDMODE interrupt status bits clearing from PCI config space
Make sure that we also update the normal DMA interrupt status bits at the same time, and alter the IRQ if being cleared accordingly. Signed-off-by: NMark Cave-Ayland <mark.cave-ayland@ilande.co.uk> Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>
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