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/i2c.c b/hw/i2c.c
index 7a1b358..5473772 100644
--- a/hw/i2c.c
+++ b/hw/i2c.c
@@ -149,14 +149,14 @@ void i2c_slave_load(QEMUFile *f, i2c_slave *dev)
     }
 }
 
-static void i2c_slave_qdev_init(DeviceState *dev, DeviceInfo *base)
+static int i2c_slave_qdev_init(DeviceState *dev, DeviceInfo *base)
 {
     I2CSlaveInfo *info = container_of(base, I2CSlaveInfo, qdev);
     i2c_slave *s = I2C_SLAVE_FROM_QDEV(dev);
 
     s->info = info;
 
-    info->init(s);
+    return info->init(s);
 }
 
 void i2c_register_slave(I2CSlaveInfo *info)