openwrt/target/linux/generic/backport-5.10/787-v5.12-r8152-check-if-the-pointer-of-the-function-exists.patch

From e78b75f5be204a0a235da995d01c778dc282bb42 Mon Sep 17 00:00:00 2001
From: Hayes Wang <hayeswang@realtek.com>
Date: Fri, 19 Feb 2021 17:04:41 +0800
Subject: [PATCH] r8152: check if the pointer of the function exists

commit c79515e47935c747282c6ed2ee5b2ef039756eeb upstream.

Return error code if autosuspend_en, eee_get, or eee_set don't exist.

Signed-off-by: Hayes Wang <hayeswang@realtek.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
 drivers/net/usb/r8152.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

--- a/drivers/net/usb/r8152.c
+++ b/drivers/net/usb/r8152.c
@@ -5737,6 +5737,9 @@ static int rtl8152_runtime_suspend(struc
 	struct net_device *netdev = tp->netdev;
 	int ret = 0;
 
+	if (!tp->rtl_ops.autosuspend_en)
+		return -EBUSY;
+
 	set_bit(SELECTIVE_SUSPEND, &tp->flags);
 	smp_mb__after_atomic();
 
@@ -6136,6 +6139,11 @@ rtl_ethtool_get_eee(struct net_device *n
 	struct r8152 *tp = netdev_priv(net);
 	int ret;
 
+	if (!tp->rtl_ops.eee_get) {
+		ret = -EOPNOTSUPP;
+		goto out;
+	}
+
 	ret = usb_autopm_get_interface(tp->intf);
 	if (ret < 0)
 		goto out;
@@ -6158,6 +6166,11 @@ rtl_ethtool_set_eee(struct net_device *n
 	struct r8152 *tp = netdev_priv(net);
 	int ret;
 
+	if (!tp->rtl_ops.eee_set) {
+		ret = -EOPNOTSUPP;
+		goto out;
+	}
+
 	ret = usb_autopm_get_interface(tp->intf);
 	if (ret < 0)
 		goto out;