netdev - [PATCH net-next] net: hns: use IRQ_NOAUTOEN to avoid irq is enabled due to request

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Date:   Fri, 11 Sep 2020 13:55:10 +1200
From:   Barry Song <song.bao.hua@...ilicon.com>
To:     <davem@...emloft.net>, <kuba@...nel.org>, <netdev@...r.kernel.org>
CC:     <linuxarm@...wei.com>, Barry Song <song.bao.hua@...ilicon.com>,
        "Salil Mehta" <salil.mehta@...wei.com>,
        Yunsheng Lin <linyunsheng@...wei.com>
Subject: [PATCH net-next] net: hns: use IRQ_NOAUTOEN to avoid irq is enabled due to request_irq

Rather than doing request_irq and then disabling the irq immediately, it
should be safer to use IRQ_NOAUTOEN flag for the irq. It removes any gap
between request_irq() and disable_irq().

Cc: Salil Mehta <salil.mehta@...wei.com>
Reviewed-by: Yunsheng Lin <linyunsheng@...wei.com>
Signed-off-by: Barry Song <song.bao.hua@...ilicon.com>
---
 drivers/net/ethernet/hisilicon/hns/hns_enet.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/hisilicon/hns/hns_enet.c b/drivers/net/ethernet/hisilicon/hns/hns_enet.c
index 22522f8a5299..34cc469656e8 100644
--- a/drivers/net/ethernet/hisilicon/hns/hns_enet.c
+++ b/drivers/net/ethernet/hisilicon/hns/hns_enet.c
@@ -11,6 +11,7 @@
 #include <linux/io.h>
 #include <linux/ip.h>
 #include <linux/ipv6.h>
+#include <linux/irq.h>
 #include <linux/module.h>
 #include <linux/phy.h>
 #include <linux/platform_device.h>
@@ -1293,6 +1294,7 @@ static int hns_nic_init_irq(struct hns_nic_priv *priv)
 
 		rd->ring->ring_name[RCB_RING_NAME_LEN - 1] = '\0';
 
+		irq_set_status_flags(rd->ring->irq, IRQ_NOAUTOEN);
 		ret = request_irq(rd->ring->irq,
 				  hns_irq_handle, 0, rd->ring->ring_name, rd);
 		if (ret) {
@@ -1300,7 +1302,6 @@ static int hns_nic_init_irq(struct hns_nic_priv *priv)
 				   rd->ring->irq);
 			goto out_free_irq;
 		}
-		disable_irq(rd->ring->irq);
 
 		cpu = hns_nic_init_affinity_mask(h->q_num, i,
 						 rd->ring, &rd->mask);
-- 
2.25.1