1 files changed, 18 insertions, 0 deletions
diff --git a/hw/scsi/scsi-bus.c b/hw/scsi/scsi-bus.c
index 4403717c4a..ceceafb2cd 100644
--- a/hw/scsi/scsi-bus.c
+++ b/hw/scsi/scsi-bus.c
@@ -1616,6 +1616,24 @@ static int scsi_ua_precedence(SCSISense sense)
     return (sense.asc << 8) | sense.ascq;
 }
 
+void scsi_bus_set_ua(SCSIBus *bus, SCSISense sense)
+{
+    int prec1, prec2;
+    if (sense.key != UNIT_ATTENTION) {
+        return;
+    }
+
+    /*
+     * Override a pre-existing unit attention condition, except for a more
+     * important reset condition.
+     */
+    prec1 = scsi_ua_precedence(bus->unit_attention);
+    prec2 = scsi_ua_precedence(sense);
+    if (prec2 < prec1) {
+        bus->unit_attention = sense;
+    }
+}
+
 void scsi_device_set_ua(SCSIDevice *sdev, SCSISense sense)
 {
     int prec1, prec2;