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| author |   Herbert Xu <herbert@gondor.apana.org.au> | 2014-12-21 07:16:24 +1100 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2014-12-23 23:20:21 -0500 |
| commit | 6bd373ebbac4b13ecd39ddc37a0dc5ad4c5e4585 (patch) | |
| tree | acd7a1d4a9f2ad46bd4cd652fe47af57af61c9cf /net | |
| parent | net: Detect drivers that reschedule NAPI and exhaust budget (diff) | |
| download | linux-dev-6bd373ebbac4b13ecd39ddc37a0dc5ad4c5e4585.tar.xz linux-dev-6bd373ebbac4b13ecd39ddc37a0dc5ad4c5e4585.zip | |
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>
Diffstat (limited to 'net')
| -rw-r--r-- | net/core/dev.c | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/net/core/dev.c b/net/core/dev.c index c0cf1293df06..b85eba9dfd88 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -4634,16 +4634,15 @@ static void net_rx_action(struct softirq_action *h) 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) && |