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xen-netback: do not report success if backend_create_xenvif() fails

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If xenvif_alloc() or xenbus_scanf() fail in backend_create_xenvif(),
xenbus is left in offline mode but netback_probe() reports success.

The patch implements propagation of error code for backend_create_xenvif().

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
Acked-by: Wei Liu <wei.liu2@citrix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alexey Khoroshilov 2014-11-24 13:58:00 +03:00 committed by David S. Miller
parent be6572fdb1
commit 2dd34339ac
1 changed files with 9 additions and 6 deletions
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15
drivers/net/xen-netback/xenbus.c
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@ -39,7 +39,7 @@ struct backend_info {
static int connect_rings(struct backend_info *be, struct xenvif_queue *queue);
static void connect(struct backend_info *be);
static int read_xenbus_vif_flags(struct backend_info *be);
static void backend_create_xenvif(struct backend_info *be);
static int backend_create_xenvif(struct backend_info *be);
static void unregister_hotplug_status_watch(struct backend_info *be);
static void set_backend_state(struct backend_info *be,
enum xenbus_state state);
@ -352,7 +352,9 @@ static int netback_probe(struct xenbus_device *dev,
be->state = XenbusStateInitWait;
/* This kicks hotplug scripts, so do it immediately. */
backend_create_xenvif(be);
err = backend_create_xenvif(be);
if (err)
goto fail;
return 0;
@ -397,19 +399,19 @@ static int netback_uevent(struct xenbus_device *xdev,
}
static void backend_create_xenvif(struct backend_info *be)
static int backend_create_xenvif(struct backend_info *be)
{
int err;
long handle;
struct xenbus_device *dev = be->dev;
if (be->vif != NULL)
return;
return 0;
err = xenbus_scanf(XBT_NIL, dev->nodename, "handle", "%li", &handle);
if (err != 1) {
xenbus_dev_fatal(dev, err, "reading handle");
return;
return (err < 0) ? err : -EINVAL;
}
be->vif = xenvif_alloc(&dev->dev, dev->otherend_id, handle);
@ -417,10 +419,11 @@ static void backend_create_xenvif(struct backend_info *be)
err = PTR_ERR(be->vif);
be->vif = NULL;
xenbus_dev_fatal(dev, err, "creating interface");
return;
return err;
}
kobject_uevent(&dev->dev.kobj, KOBJ_ONLINE);
return 0;
}
static void backend_disconnect(struct backend_info *be)