Fix release_drive on unplugged devices (pci_piix3_xen_ide_unplug)

pci_piix3_xen_ide_unplug should completely unhook the unplugged
IDEDevice from the corresponding BlockBackend, otherwise the next call
to release_drive will try to detach the drive again.

Suggested-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>

diff --git a/hw/ide/piix.c b/hw/ide/piix.c
index c043a8de441211cb896f43880f15c653a7c7dd30..15729f0f713a1a0bb8419d5df885a9b59b3ba523 100644 (file)
--- a/hw/ide/piix.c
+++ b/hw/ide/piix.c
@@ -172,6 +172,7 @@ static int pci_piix3_xen_ide_unplug(DeviceState *dev)
     PCIIDEState *pci_ide;
     DriveInfo *di;
     int i;
+    IDEDevice *idedev;
 
     pci_ide = PCI_IDE(dev);
 
@@ -184,6 +185,12 @@ static int pci_piix3_xen_ide_unplug(DeviceState *dev)
             }
             bdrv_close(di->bdrv);
             pci_ide->bus[di->bus].ifs[di->unit].bs = NULL;
+            if (!(i % 2)) {
+                idedev = pci_ide->bus[di->bus].master;
+            } else {
+                idedev = pci_ide->bus[di->bus].slave;
+            }
+            idedev->conf.bs = NULL;
             drive_put_ref(di);
         }
     }