linux-kernel - [PATCH 3/3] net-next/hinic: fix a bug in rx data flow

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Message-ID: <20181115200548.5326-3-xuechaojing@huawei.com>
Date:   Thu, 15 Nov 2018 20:05:48 +0000
From:   Xue Chaojing <xuechaojing@...wei.com>
To:     <davem@...emloft.net>
CC:     <linux-kernel@...r.kernel.org>, <xuechaojing@...wei.com>,
        <netdev@...r.kernel.org>, <wulike1@...wei.com>,
        <chiqijun@...wei.com>, <fy.wang@...wei.com>, <tony.qu@...wei.com>,
        <luoshaokai@...wei.com>
Subject: [PATCH 3/3] net-next/hinic: fix a bug in rx data flow

In rx_alloc_pkts(), there is a loop call of tasklet, which causes
100% cpu utilization, even no packets are being received. This patch
fixes this bug.

Signed-off-by: Xue Chaojing <xuechaojing@...wei.com>
---
 drivers/net/ethernet/huawei/hinic/hinic_rx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/huawei/hinic/hinic_rx.c b/drivers/net/ethernet/huawei/hinic/hinic_rx.c
index 93e8f207f6da..f86f2e693224 100644
--- a/drivers/net/ethernet/huawei/hinic/hinic_rx.c
+++ b/drivers/net/ethernet/huawei/hinic/hinic_rx.c
@@ -229,9 +229,9 @@ static int rx_alloc_pkts(struct hinic_rxq *rxq)
 		wmb();  /* write all the wqes before update PI */
 
 		hinic_rq_update(rxq->rq, prod_idx);
+		tasklet_schedule(&rxq->rx_task);
 	}
 
-	tasklet_schedule(&rxq->rx_task);
 	return i;
 }
 
-- 
2.17.1