linux-kernel - [PATCH 3.16 168/366] xen-netfront: Remove the meaningless code

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Date:   Sun, 11 Nov 2018 19:49:05 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Li, Liang Z" <liang.z.li@...el.com>,
        "David Vrabel" <david.vrabel@...rix.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 3.16 168/366] xen-netfront: Remove the meaningless code

3.16.61-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: "Li, Liang Z" <liang.z.li@...el.com>

commit 905726c1c5a3ca620ba7d73c78eddfb91de5ce28 upstream.

The function netif_set_real_num_tx_queues() will return -EINVAL if
the second parameter < 1, so call this function with the second
parameter set to 0 is meaningless.

Signed-off-by: Liang Li <liang.z.li@...el.com>
Reviewed-by: David Vrabel <david.vrabel@...rix.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/net/xen-netfront.c | 7 -------
 1 file changed, 7 deletions(-)

--- a/drivers/net/xen-netfront.c
+++ b/drivers/net/xen-netfront.c
@@ -1330,10 +1330,6 @@ static struct net_device *xennet_create_
 	np                   = netdev_priv(netdev);
 	np->xbdev            = dev;
 
-	/* No need to use rtnl_lock() before the call below as it
-	 * happens before register_netdev().
-	 */
-	netif_set_real_num_tx_queues(netdev, 0);
 	np->queues = NULL;
 
 	err = -ENOMEM;
@@ -1992,9 +1988,6 @@ abort_transaction_no_dev_fatal:
 	xennet_disconnect_backend(info);
 	kfree(info->queues);
 	info->queues = NULL;
-	rtnl_lock();
-	netif_set_real_num_tx_queues(info->netdev, 0);
-	rtnl_unlock();
  out:
 	return err;
 }