xen-netback: correctly check failed allocation

Since vzalloc can be failed in memory pressure,
writes -ENOMEM to xenstore to indicate error.

Signed-off-by: Insu Yun <wuninsu@gmail.com>
Acked-by: Wei Liu <wei.liu2@citrix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/xen-netback/xenbus.c b/drivers/net/xen-netback/xenbus.c
index 929a6e7e5ecfe9249569c0059516e531fb0b79eb..56ebd8267386e6a91cabf506962e15f5d83531ec 100644 (file)
--- a/drivers/net/xen-netback/xenbus.c
+++ b/drivers/net/xen-netback/xenbus.c
@@ -788,6 +788,12 @@ static void connect(struct backend_info *be)
        /* Use the number of queues requested by the frontend */
        be->vif->queues = vzalloc(requested_num_queues *
                                  sizeof(struct xenvif_queue));
+       if (!be->vif->queues) {
+               xenbus_dev_fatal(dev, -ENOMEM,
+                                "allocating queues");
+               return;
+       }
+
        be->vif->num_queues = requested_num_queues;
        be->vif->stalled_queues = requested_num_queues;