qdev: add return value to init() callbacks.

Sorry folks, but it has to be.  One more of these invasive qdev patches.

We have a serious design bug in the qdev interface:  device init
callbacks can't signal failure because the init() callback has no
return value.  This patch fixes it.

We have already one case in-tree where this is needed:
Try -device virtio-blk-pci (without drive= specified) and watch qemu
segfault.  This patch fixes it.

With usb+scsi being converted to qdev we'll get more devices where the
init callback can fail for various reasons.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/hw/ssi.c b/hw/ssi.c
index a5133be..54ad1a1 100644
--- a/hw/ssi.c
+++ b/hw/ssi.c
@@ -18,7 +18,7 @@ static struct BusInfo ssi_bus_info = {
     .size = sizeof(SSIBus),
 };
 
-static void ssi_slave_init(DeviceState *dev, DeviceInfo *base_info)
+static int ssi_slave_init(DeviceState *dev, DeviceInfo *base_info)
 {
     SSISlaveInfo *info = container_of(base_info, SSISlaveInfo, qdev);
     SSISlave *s = SSI_SLAVE_FROM_QDEV(dev);
@@ -31,7 +31,7 @@ static void ssi_slave_init(DeviceState *dev, DeviceInfo *base_info)
     }
 
     s->info = info;
-    info->init(s);
+    return info->init(s);
 }
 
 void ssi_register_slave(SSISlaveInfo *info)