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 <[email protected]>
Reviewed-by: Yunsheng Lin <[email protected]>
Signed-off-by: Barry Song <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

Author: Barry Song

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>
@@ -1290,14 +1291,14 @@ 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) {
 			netdev_err(priv->netdev, "request irq(%d) fail\n",
 				   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);