From 4e5de00fb124d82f9c4ce2ac433ed3d691783c01 Mon Sep 17 00:00:00 2001
From: Jinhua Cao <caojinhua1@huawei.com>
Date: Wed, 9 Feb 2022 19:58:21 +0800
Subject: [PATCH] virtio-scsi: bugfix: fix qemu crash for hotplug scsi disk
 with dataplane

The vm will trigger a disk sweep operation after plugging
a controller who's io type is iothread.  If attach a scsi
disk immediately, the sg_inqury request in vm will trigger
the assert in virtio_scsi_ctx_check(), which is called by
virtio_scsi_handle_cmd_req_prepare().

Add judgment in virtio_scsi_handle_cmd_req_prepare() and
return IO Error directly if the device has not been
initialized.

Signed-off-by: Jinhua Cao <caojinhua1@huawei.com>
---
 hw/scsi/virtio-scsi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/scsi/virtio-scsi.c b/hw/scsi/virtio-scsi.c
index 9c751bf296..bc7feb404a 100644
--- a/hw/scsi/virtio-scsi.c
+++ b/hw/scsi/virtio-scsi.c
@@ -781,7 +781,7 @@ static int virtio_scsi_handle_cmd_req_prepare(VirtIOSCSI *s, VirtIOSCSIReq *req)
                               req->req.cmd.tag, req->req.cmd.cdb[0]);
 
     d = virtio_scsi_device_get(s, req->req.cmd.lun);
-    if (!d) {
+    if (!d || !d->qdev.realized) {
         req->resp.cmd.response = VIRTIO_SCSI_S_BAD_TARGET;
         virtio_scsi_complete_cmd_req(req);
         return -ENOENT;
-- 
2.27.0