From: Fiona Ebner <f.ebner@proxmox.com>

Commit 3089637461 ("scsi: Don't ignore most usb-storage properties")
removed the call to object_property_set_int() and thus the 'set'
method for the bootindex property was also not called anymore. Here
that method is device_set_bootindex() (as configured by
scsi_dev_instance_init() -> device_add_bootindex_property()) which as
a side effect registers the device via add_boot_device_path().

As reported by a downstream user [0], the bootindex property did not
have the desired effect anymore for legacy drives. Fix the regression
by explicitly calling the add_boot_device_path() function after
checking that the bootindex is not yet used (to avoid
add_boot_device_path() calling exit()).

[0]: https://forum.proxmox.com/threads/149772/post-679433

Cc: qemu-stable@nongnu.org
Fixes: 3089637461 ("scsi: Don't ignore most usb-storage properties")
Suggested-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>
Link: https://lore.kernel.org/r/20240710152529.1737407-1-f.ebner@proxmox.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
(cherry picked from commit 57a8a80d1a5b28797b21d30bfc60601945820e51)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

diff --git a/hw/scsi/scsi-bus.c b/hw/scsi/scsi-bus.c
index 9e40b0c920..53eff5dd3d 100644
--- a/hw/scsi/scsi-bus.c
+++ b/hw/scsi/scsi-bus.c
@@ -384,6 +384,7 @@ SCSIDevice *scsi_bus_legacy_add_drive(SCSIBus *bus, BlockBackend *blk,
     DeviceState *dev;
     SCSIDevice *s;
     DriveInfo *dinfo;
+    Error *local_err = NULL;
 
     if (blk_is_sg(blk)) {
         driver = "scsi-generic";
@@ -403,6 +404,14 @@ SCSIDevice *scsi_bus_legacy_add_drive(SCSIBus *bus, BlockBackend *blk,
     s = SCSI_DEVICE(dev);
     s->conf = *conf;
 
+    check_boot_index(conf->bootindex, &local_err);
+    if (local_err) {
+        object_unparent(OBJECT(dev));
+        error_propagate(errp, local_err);
+        return NULL;
+    }
+    add_boot_device_path(conf->bootindex, dev, NULL);
+
     qdev_prop_set_uint32(dev, "scsi-id", unit);
     if (object_property_find(OBJECT(dev), "removable")) {
         qdev_prop_set_bit(dev, "removable", removable);
-- 
2.39.2