net: hold netdev instance lock during ioctl operations

Convert all ndo_eth_ioctl invocations to dev_eth_ioctl which does the
locking. Reflow some of the dev_siocxxx to drop else clause.

Cc: Saeed Mahameed <[email protected]>
Signed-off-by: Stanislav Fomichev <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

1 files changed, 30 insertions, 0 deletions

diff --git a/net/core/dev_api.c b/net/core/dev_api.c
index 21584f57e050..059413d9ef9d 100644
--- a/net/core/dev_api.c
+++ b/net/core/dev_api.c
@@ -222,3 +222,33 @@ void dev_close(struct net_device *dev)
 	netdev_unlock_ops(dev);
 }
 EXPORT_SYMBOL(dev_close);
+
+int dev_eth_ioctl(struct net_device *dev,
+		  struct ifreq *ifr, unsigned int cmd)
+{
+	const struct net_device_ops *ops = dev->netdev_ops;
+	int ret = -ENODEV;
+
+	if (!ops->ndo_eth_ioctl)
+		return -EOPNOTSUPP;
+
+	netdev_lock_ops(dev);
+	if (netif_device_present(dev))
+		ret = ops->ndo_eth_ioctl(dev, ifr, cmd);
+	netdev_unlock_ops(dev);
+
+	return ret;
+}
+EXPORT_SYMBOL(dev_eth_ioctl);
+
+int dev_set_mtu(struct net_device *dev, int new_mtu)
+{
+	int ret;
+
+	netdev_lock_ops(dev);
+	ret = netif_set_mtu(dev, new_mtu);
+	netdev_unlock_ops(dev);
+
+	return ret;
+}
+EXPORT_SYMBOL(dev_set_mtu);