net: Always poll at least one device in net_rx_action
We should only perform the softnet_break check after we have polled
at least one device in net_rx_action. Otherwise a zero or negative
setting of netdev_budget can lock up the whole system.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/core/dev.c b/net/core/dev.c
index c0cf129..b85eba9 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -4634,16 +4634,15 @@
while (!list_empty(&list)) {
struct napi_struct *n;
+ n = list_first_entry(&list, struct napi_struct, poll_list);
+ budget -= napi_poll(n, &repoll);
+
/* If softirq window is exhausted then punt.
* Allow this to run for 2 jiffies since which will allow
* an average latency of 1.5/HZ.
*/
if (unlikely(budget <= 0 || time_after_eq(jiffies, time_limit)))
goto softnet_break;
-
-
- n = list_first_entry(&list, struct napi_struct, poll_list);
- budget -= napi_poll(n, &repoll);
}
if (!sd_has_rps_ipi_waiting(sd) &&