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| author | Alexey Khoroshilov <khoroshilov@ispras.ru> | 2014-11-24 13:58:00 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-11-24 16:14:45 -0500 |
| commit | 2dd34339ac6305c4f2f4e589b858212e339d31e9 (patch) | |
| tree | 0ee36ed91c86226b7fed62c6fbd98066bab6fef2 /drivers/net/xen-netback/xenbus.c | |
| parent | be6572fdb1bfbe23b2624d477de50af50b02f5d6 (diff) | |
| download | lwn-2dd34339ac6305c4f2f4e589b858212e339d31e9.tar.gz lwn-2dd34339ac6305c4f2f4e589b858212e339d31e9.zip | |
xen-netback: do not report success if backend_create_xenvif() fails
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>
Diffstat (limited to 'drivers/net/xen-netback/xenbus.c')
| -rw-r--r-- | drivers/net/xen-netback/xenbus.c | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/drivers/net/xen-netback/xenbus.c b/drivers/net/xen-netback/xenbus.c index 4e56a27f9689..fab0d4b42f58 100644 --- a/drivers/net/xen-netback/xenbus.c +++ b/drivers/net/xen-netback/xenbus.c @@ -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) |