netdev - [PATCH 4/6] net: stmmac: fix system hang if change mac address after interface ifdown

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Date:   Fri, 19 Nov 2021 10:53:57 +0800
From:   Meng Li <Meng.Li@...driver.com>
To:     stable@...r.kernel.org, davem@...emloft.net, kuba@...nel.org,
        mcoquelin.stm32@...il.com, linux@...linux.org.uk, andrew@...n.ch,
        qiangqing.zhang@....com
Cc:     linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        meng.li@...driver.com
Subject: [PATCH 4/6] net: stmmac: fix system hang if change mac address after interface ifdown

From: Joakim Zhang <qiangqing.zhang@....com>

commit 4691ffb18ac908609aab07d13af7995b6b89d33c upstream.

Fix system hang with below sequences:
~# ifconfig ethx down
~# ifconfig ethx hw ether xx:xx:xx:xx:xx:xx

After ethx down, stmmac all clocks gated off and then register access causes
system hang.

Fixes: 5ec55823438e ("net: stmmac: add clocks management for gmac driver")
Signed-off-by: Joakim Zhang <qiangqing.zhang@....com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Meng Li <Meng.Li@...driver.com>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 51626edc6a4c..cccf98f66ff4 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -4324,12 +4324,21 @@ static int stmmac_set_mac_address(struct net_device *ndev, void *addr)
 	struct stmmac_priv *priv = netdev_priv(ndev);
 	int ret = 0;
 
+	ret = pm_runtime_get_sync(priv->device);
+	if (ret < 0) {
+		pm_runtime_put_noidle(priv->device);
+		return ret;
+	}
+
 	ret = eth_mac_addr(ndev, addr);
 	if (ret)
-		return ret;
+		goto set_mac_error;
 
 	stmmac_set_umac_addr(priv, priv->hw, ndev->dev_addr, 0);
 
+set_mac_error:
+	pm_runtime_put(priv->device);
+
 	return ret;
 }
 
-- 
2.17.1