virtio_net: do not reschedule rx refill forever
We currently fill all of RX ring, then add_buf
returns ENOSPC, which gets mis-detected as an out of
memory condition and causes us to reschedule the work,
and so on forever. Fix this by oom = err == -ENOMEM;
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Cc: stable@kernel.org # .34.x
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 1edb7a6..ee75711 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -415,7 +415,7 @@
static bool try_fill_recv(struct virtnet_info *vi, gfp_t gfp)
{
int err;
- bool oom = false;
+ bool oom;
do {
if (vi->mergeable_rx_bufs)
@@ -425,10 +425,9 @@
else
err = add_recvbuf_small(vi, gfp);
- if (err < 0) {
- oom = true;
+ oom = err == -ENOMEM;
+ if (err < 0)
break;
- }
++vi->num;
} while (err > 0);
if (unlikely(vi->num > vi->max))
