fix off-by-one error in pci_piix3_xen_ide_unplug

Fix off-by-one error when unplugging disks, which would otherwise leave the last ATA disk plugged, with obvious consequences. Also rewrite loop to be more readable.

upstream-commit-id: d4f9e806c20607cafe7bb0d9eba14ccb160390a1

Signed-off-by: James Harper <james.harper@ejbdigital.com.au>
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>

diff --git a/hw/ide/piix.c b/hw/ide/piix.c
index e6e6c0bb7a46a0dca30e009084b716ba67fa49c3..c043a8de441211cb896f43880f15c653a7c7dd30 100644 (file)
--- a/hw/ide/piix.c
+++ b/hw/ide/piix.c
@@ -171,11 +171,11 @@ static int pci_piix3_xen_ide_unplug(DeviceState *dev)
 {
     PCIIDEState *pci_ide;
     DriveInfo *di;
-    int i = 0;
+    int i;
 
     pci_ide = PCI_IDE(dev);
 
-    for (; i < 3; i++) {
+    for (i = 0; i < 4; i++) {
         di = drive_get_by_index(IF_IDE, i);
         if (di != NULL && !di->media_cd) {
             DeviceState *ds = bdrv_get_attached_dev(di->bdrv);