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s390x: follow qdev tree to detect SCSI device on a CCW bus 

Do not make assumptions on the parent type of the SCSIDevice, instead
use object_dynamic_cast all the way up to the CcwDevice.  This is cleaner
because there is no guarantee that the bus is on a virtio-scsi device;
that is only the case for the default configuration of QEMU's s390x
target.

Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2022-03-28 09:40:00 +02:00
parent d8701185f4
commit 7d2eb76d04
1 changed files with 12 additions and 8 deletions
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20
hw/s390x/ipl.c
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@ -375,14 +375,18 @@ static CcwDevice *s390_get_ccw_device(DeviceState *dev_st, int *devtype)
object_dynamic_cast(OBJECT(dev_st),
TYPE_SCSI_DEVICE);
if (sd) {
SCSIBus *bus = scsi_bus_from_device(sd);
VirtIOSCSI *vdev = container_of(bus, VirtIOSCSI, bus);
VirtIOSCSICcw *scsi_ccw = container_of(vdev, VirtIOSCSICcw,
vdev);
ccw_dev = (CcwDevice *)object_dynamic_cast(OBJECT(scsi_ccw),
TYPE_CCW_DEVICE);
tmp_dt = CCW_DEVTYPE_SCSI;
SCSIBus *sbus = scsi_bus_from_device(sd);
VirtIODevice *vdev = (VirtIODevice *)
object_dynamic_cast(OBJECT(sbus->qbus.parent),
TYPE_VIRTIO_DEVICE);
if (vdev) {
ccw_dev = (CcwDevice *)
object_dynamic_cast(OBJECT(qdev_get_parent_bus(DEVICE(vdev))->parent),
TYPE_CCW_DEVICE);
if (ccw_dev) {
tmp_dt = CCW_DEVTYPE_SCSI;
}
}
}
}
}