[Qemu-devel] [PATCH] Fix backcompat for hotplug of SCSI controllers

["Daniel P. Berrange" <berrange@redhat.com>]

SCSI controllers have no trouble existing without any attached
disks. This could be achieved with the (legacy) monitor syntax

  pci_add pci_addr=auto storage if=scsi

This is now denied with

  scsi requires a backing file/device.
  failed to add if=scsi

There is no need for this denial and it breaks compatability
with existing QEMU usage, so remove the check for presence
of a drive.

  Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
---
 hw/pci-hotplug.c |    6 +-----
 1 files changed, 1 insertions(+), 5 deletions(-)

diff --git a/hw/pci-hotplug.c b/hw/pci-hotplug.c
index 081d6d1..616435a 100644
--- a/hw/pci-hotplug.c
+++ b/hw/pci-hotplug.c
@@ -182,14 +182,10 @@ static PCIDevice *qemu_pci_hot_add_storage(Monitor *mon,
 
     switch (type) {
     case IF_SCSI:
-        if (!dinfo) {
-            monitor_printf(mon, "scsi requires a backing file/device.\n");
-            return NULL;
-        }
         dev = pci_create(bus, devfn, "lsi53c895a");
         if (qdev_init(&dev->qdev) < 0)
             dev = NULL;
-        if (dev) {
+        if (dev && dinfo) {
             if (scsi_hot_add(&dev->qdev, dinfo, 0) != 0) {
                 qdev_unplug(&dev->qdev);
                 dev = NULL;
-- 
1.6.5.2