firewire: Clear all interrupt bits before shutting down.

Some flaky controllers doesn't honor the masterIntEnable bits
and can generate bus reset events even if that bit is cleared.

Signed-off-by: Kristian Høgsberg <krh@redhat.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
diff --git a/drivers/firewire/fw-ohci.c b/drivers/firewire/fw-ohci.c
index 5081541..3746792 100644
--- a/drivers/firewire/fw-ohci.c
+++ b/drivers/firewire/fw-ohci.c
@@ -1943,7 +1943,8 @@
 	struct fw_ohci *ohci;
 
 	ohci = pci_get_drvdata(dev);
-	reg_write(ohci, OHCI1394_IntMaskClear, OHCI1394_masterIntEnable);
+	reg_write(ohci, OHCI1394_IntMaskClear, ~0);
+	flush_writes(ohci);
 	fw_core_remove_card(&ohci->card);
 
 	/* FIXME: Fail all pending packets here, now that the upper