[PATCH] hw/ufs: avoid generating the same ID string for different LU devices

[Akinobu Mita <akinobu.mita@gmail.com>]

QEMU would not start when trying to create two UFS host controllers and
a UFS logical unit for each with the following options:

-device ufs,id=bus0 \
-device ufs-lu,drive=drive1,bus=bus0,lun=0 \
-device ufs,id=bus1 \
-device ufs-lu,drive=drive2,bus=bus1,lun=0 \

This is because the same ID string ("0:0:0/scsi-disk") is generated
for both UFS logical units.

To fix this issue, prepend the parent pci device's path to make
the ID string unique.
("0000:00:03.0/0:0:0/scsi-disk" and "0000:00:04.0/0:0:0/scsi-disk")

Fixes: 096434fea13a ("hw/ufs: Modify lu.c to share codes with SCSI subsystem")
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
---
 hw/ufs/ufs.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/hw/ufs/ufs.c b/hw/ufs/ufs.c
index 68c5f1f6c9..eccdb852a0 100644
--- a/hw/ufs/ufs.c
+++ b/hw/ufs/ufs.c
@@ -1323,9 +1323,17 @@ static bool ufs_bus_check_address(BusState *qbus, DeviceState *qdev,
     return true;
 }
 
+static char *ufs_bus_get_dev_path(DeviceState *dev)
+{
+    BusState *bus = qdev_get_parent_bus(dev);
+
+    return qdev_get_dev_path(bus->parent);
+}
+
 static void ufs_bus_class_init(ObjectClass *class, void *data)
 {
     BusClass *bc = BUS_CLASS(class);
+    bc->get_dev_path = ufs_bus_get_dev_path;
     bc->check_address = ufs_bus_check_address;
 }
 
-- 
2.34.1