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-rw-r--r--drivers/net/xen-netfront.c14
1 files changed, 11 insertions, 3 deletions
diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c
index 8315fe73ecd0..9dba69731f30 100644
--- a/drivers/net/xen-netfront.c
+++ b/drivers/net/xen-netfront.c
@@ -281,6 +281,7 @@ static void xennet_alloc_rx_buffers(struct netfront_queue *queue)
{
RING_IDX req_prod = queue->rx.req_prod_pvt;
int notify;
+ int err = 0;
if (unlikely(!netif_carrier_ok(queue->info->netdev)))
return;
@@ -295,8 +296,10 @@ static void xennet_alloc_rx_buffers(struct netfront_queue *queue)
struct xen_netif_rx_request *req;
skb = xennet_alloc_one_rx_buffer(queue);
- if (!skb)
+ if (!skb) {
+ err = -ENOMEM;
break;
+ }
id = xennet_rxidx(req_prod);
@@ -320,8 +323,13 @@ static void xennet_alloc_rx_buffers(struct netfront_queue *queue)
queue->rx.req_prod_pvt = req_prod;
- /* Not enough requests? Try again later. */
- if (req_prod - queue->rx.sring->req_prod < NET_RX_SLOTS_MIN) {
+ /* Try again later if there are not enough requests or skb allocation
+ * failed.
+ * Enough requests is quantified as the sum of newly created slots and
+ * the unconsumed slots at the backend.
+ */
+ if (req_prod - queue->rx.rsp_cons < NET_RX_SLOTS_MIN ||
+ unlikely(err)) {
mod_timer(&queue->rx_refill_timer, jiffies + (HZ/10));
return;
}