net: introduce helper dev_change_tx_queue_len()
This patch promotes the local change_tx_queue_len() to a core
helper function, dev_change_tx_queue_len(), so that rtnetlink
and net-sysfs could share the code. This also prepares for the
following patch.
Note, the -EFAULT in the original code doesn't make sense,
we should propagate the errno from notifiers.
Cc: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index e04af7b..061e27c 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -2337,19 +2337,11 @@ static int do_setlink(const struct sk_buff *skb,
if (tb[IFLA_TXQLEN]) {
unsigned int value = nla_get_u32(tb[IFLA_TXQLEN]);
- unsigned int orig_len = dev->tx_queue_len;
- if (dev->tx_queue_len ^ value) {
- dev->tx_queue_len = value;
- err = call_netdevice_notifiers(
- NETDEV_CHANGE_TX_QUEUE_LEN, dev);
- err = notifier_to_errno(err);
- if (err) {
- dev->tx_queue_len = orig_len;
- goto errout;
- }
- status |= DO_SETLINK_MODIFIED;
- }
+ err = dev_change_tx_queue_len(dev, value);
+ if (err)
+ goto errout;
+ status |= DO_SETLINK_MODIFIED;
}
if (tb[IFLA_GSO_MAX_SIZE]) {
