mirror of
https://github.com/openwrt/openwrt.git
synced 2025-02-03 09:40:44 +00:00
764cc5c6a6
The 2nd gmac of mediatek soc ethernet may not be connected to a PHY and a phy-handle isn't always available. Unfortunately, mt7530 dsa driver assumes that the 2nd gmac is always connected to switch port 5 and setup mt7530 according to phy address of 2nd gmac node, causing null pointer dereferencing when phy-handle isn't defined in dts. This commit fix this setup code by checking return value of of_parse_phandle before using it. Signed-off-by: DENG Qingfang <dengqf6@mail2.sysu.edu.cn>
40 lines
1.5 KiB
Diff
40 lines
1.5 KiB
Diff
From 0452800f6db4ed0a42ffb15867c0acfd68829f6a Mon Sep 17 00:00:00 2001
|
|
From: Chuanhong Guo <gch981213@gmail.com>
|
|
Date: Fri, 3 Apr 2020 19:28:24 +0800
|
|
Subject: net: dsa: mt7530: fix null pointer dereferencing in port5 setup
|
|
MIME-Version: 1.0
|
|
Content-Type: text/plain; charset=UTF-8
|
|
Content-Transfer-Encoding: 8bit
|
|
|
|
The 2nd gmac of mediatek soc ethernet may not be connected to a PHY
|
|
and a phy-handle isn't always available.
|
|
Unfortunately, mt7530 dsa driver assumes that the 2nd gmac is always
|
|
connected to switch port 5 and setup mt7530 according to phy address
|
|
of 2nd gmac node, causing null pointer dereferencing when phy-handle
|
|
isn't defined in dts.
|
|
This commit fix this setup code by checking return value of
|
|
of_parse_phandle before using it.
|
|
|
|
Fixes: 38f790a80560 ("net: dsa: mt7530: Add support for port 5")
|
|
Signed-off-by: Chuanhong Guo <gch981213@gmail.com>
|
|
Reviewed-by: Vivien Didelot <vivien.didelot@gmail.com>
|
|
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
|
|
Tested-by: René van Dorst <opensource@vdorst.com>
|
|
Signed-off-by: David S. Miller <davem@davemloft.net>
|
|
---
|
|
drivers/net/dsa/mt7530.c | 3 +++
|
|
1 file changed, 3 insertions(+)
|
|
|
|
--- a/drivers/net/dsa/mt7530.c
|
|
+++ b/drivers/net/dsa/mt7530.c
|
|
@@ -1411,6 +1411,9 @@ mt7530_setup(struct dsa_switch *ds)
|
|
continue;
|
|
|
|
phy_node = of_parse_phandle(mac_np, "phy-handle", 0);
|
|
+ if (!phy_node)
|
|
+ continue;
|
|
+
|
|
if (phy_node->parent == priv->dev->of_node->parent) {
|
|
interface = of_get_phy_mode(mac_np);
|
|
id = of_mdio_parse_addr(ds->dev, phy_node);
|