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net: stmmac: fix system hang if change mac address after interface ifdown 

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: 5ec5582343 ("net: stmmac: add clocks management for gmac driver")
Signed-off-by: Joakim Zhang <qiangqing.zhang@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Joakim Zhang 2021-05-20 20:51:17 +08:00 committed by David S. Miller
parent b3dcb31277
commit 4691ffb18a
1 changed files with 10 additions and 1 deletions
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11
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
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@ -5891,12 +5891,21 @@ 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;
}