[Patch net] net: use dev_change_tx_queue_len() for SIOCSIFTXQLEN

[Cong Wang]

As noticed by Eric, we need to switch to the helper
dev_change_tx_queue_len() for SIOCSIFTXQLEN call path too,
otheriwse still miss dev_qdisc_change_tx_queue_len().

Fixes: 6a643ddb5624 ("net: introduce helper dev_change_tx_queue_len()")
Reported-by: Eric Dumazet <eduma...@google.com>
Signed-off-by: Cong Wang <xiyou.wangc...@gmail.com>
---
 net/core/dev_ioctl.c | 11 ++---------
 1 file changed, 2 insertions(+), 9 deletions(-)

diff --git a/net/core/dev_ioctl.c b/net/core/dev_ioctl.c
index a04e1e88bf3a..50537ff961a7 100644
--- a/net/core/dev_ioctl.c
+++ b/net/core/dev_ioctl.c
@@ -285,16 +285,9 @@ static int dev_ifsioc(struct net *net, struct ifreq *ifr, 
unsigned int cmd)
                if (ifr->ifr_qlen < 0)
                        return -EINVAL;
                if (dev->tx_queue_len ^ ifr->ifr_qlen) {
-                       unsigned int orig_len = dev->tx_queue_len;
-
-                       dev->tx_queue_len = ifr->ifr_qlen;
-                       err = call_netdevice_notifiers(
-                                       NETDEV_CHANGE_TX_QUEUE_LEN, dev);
-                       err = notifier_to_errno(err);
-                       if (err) {
-                               dev->tx_queue_len = orig_len;
+                       err = dev_change_tx_queue_len(dev, ifr->ifr_qlen);
+                       if (err)
                                return err;
-                       }
                }
                return 0;
 
-- 
2.14.4