ethtool_get_rxrings() was a copy of ethtool_get_rxnfc(). Clean the code
that will never be executed for GRXRINGS specifically.

Signed-off-by: Breno Leitao <leitao@debian.org>
---
 net/ethtool/ioctl.c | 33 ++++++++++-----------------------
 1 file changed, 10 insertions(+), 23 deletions(-)

diff --git a/net/ethtool/ioctl.c b/net/ethtool/ioctl.c
index 4214ab33c3c81..a0f3de76cea03 100644
--- a/net/ethtool/ioctl.c
+++ b/net/ethtool/ioctl.c
@@ -1212,52 +1212,39 @@ static noinline_for_stack int ethtool_get_rxrings(struct net_device *dev,
 						  u32 cmd,
 						  void __user *useraddr)
 {
-	struct ethtool_rxnfc info;
-	size_t info_size = sizeof(info);
 	const struct ethtool_ops *ops = dev->ethtool_ops;
+	struct ethtool_rxnfc info;
+	size_t info_size;
 	int ret;
-	void *rule_buf = NULL;
 
 	if (!ops->get_rxnfc)
 		return -EOPNOTSUPP;
 
+	info_size = sizeof(info);
 	ret = ethtool_rxnfc_copy_struct(cmd, &info, &info_size, useraddr);
 	if (ret)
 		return ret;
 
-	if (info.cmd == ETHTOOL_GRXCLSRLALL) {
-		if (info.rule_cnt > 0) {
-			if (info.rule_cnt <= KMALLOC_MAX_SIZE / sizeof(u32))
-				rule_buf = kcalloc(info.rule_cnt, sizeof(u32),
-						   GFP_USER);
-			if (!rule_buf)
-				return -ENOMEM;
-		}
-	}
-
-	ret = ops->get_rxnfc(dev, &info, rule_buf);
+	ret = ops->get_rxnfc(dev, &info, NULL);
 	if (ret < 0)
-		goto err_out;
-
-	ret = ethtool_rxnfc_copy_to_user(useraddr, &info, info_size, rule_buf);
-err_out:
-	kfree(rule_buf);
+		return ret;
 
-	return ret;
+	return ethtool_rxnfc_copy_to_user(useraddr, &info, info_size, NULL);
 }
 
 static noinline_for_stack int ethtool_get_rxnfc(struct net_device *dev,
 						u32 cmd, void __user *useraddr)
 {
-	struct ethtool_rxnfc info;
-	size_t info_size = sizeof(info);
 	const struct ethtool_ops *ops = dev->ethtool_ops;
-	int ret;
+	struct ethtool_rxnfc info;
 	void *rule_buf = NULL;
+	size_t info_size;
+	int ret;
 
 	if (!ops->get_rxnfc)
 		return -EOPNOTSUPP;
 
+	info_size = sizeof(info);
 	ret = ethtool_rxnfc_copy_struct(cmd, &info, &info_size, useraddr);
 	if (ret)
 		return ret;

-- 
2.47.3