[PATCH][net-next,v2] virtio_net: Remove u64_stats_update_begin()/end() for stats fetch

[Li RongQing]

This place is fetching the stats, u64_stats_update_begin()/end()
should not be used, and the fetcher of stats is in the same context
as the updater of the stats, so don't need any protection

Suggested-by: Jakub Kicinski <k...@kernel.org>
Signed-off-by: Li RongQing <lirongq...@baidu.com>
---
 drivers/net/virtio_net.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 61a57d1..6604339 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -2336,12 +2336,12 @@ static void virtnet_rx_dim_update(struct virtnet_info 
*vi, struct receive_queue
        if (!rq->packets_in_napi)
                return;
 
-       u64_stats_update_begin(&rq->stats.syncp);
+       /* Don't need protection when fetching stats, since fetcher and
+        * updater of the stats are in same context */
        dim_update_sample(rq->calls,
                          u64_stats_read(&rq->stats.packets),
                          u64_stats_read(&rq->stats.bytes),
                          &cur_sample);
-       u64_stats_update_end(&rq->stats.syncp);
 
        net_dim(&rq->dim, cur_sample);
        rq->packets_in_napi = 0;
-- 
2.9.4