linux-kernel - [PATCH v5] net: stmmac: fix 'ethtool -P' return -EBUSY

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Date:   Mon, 19 Jul 2021 21:08:45 +0800
From:   Hao Chen <chenhaoa@...ontech.com>
To:     peppe.cavallaro@...com
Cc:     alexandre.torgue@...s.st.com, joabreu@...opsys.com,
        davem@...emloft.net, kuba@...nel.org, mcoquelin.stm32@...il.com,
        linux@...linux.org.uk, netdev@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-kernel@...r.kernel.org, Hao Chen <chenhaoa@...ontech.com>
Subject: [PATCH v5] net: stmmac: fix 'ethtool -P' return -EBUSY

The permanent mac address should be available for query when the device
is not up.
NetworkManager, the system network daemon, uses 'ethtool -P' to obtain
the permanent address after the kernel start. When the network device
is not up, it will return the device busy error with 'ethtool -P'. At
that time, it is unable to access the Internet through the permanent
address by NetworkManager.
I think that the '.begin' is not used to check if the device is up, it's
just a pre hook for ethtool. We shouldn't check if the device is up
there.

Signed-off-by: Hao Chen <chenhaoa@...ontech.com>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c | 8 --------
 1 file changed, 8 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c
index d0ce608b81c3..8901dc9f758e 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c
@@ -410,13 +410,6 @@ static void stmmac_ethtool_setmsglevel(struct net_device *dev, u32 level)
 
 }
 
-static int stmmac_check_if_running(struct net_device *dev)
-{
-	if (!netif_running(dev))
-		return -EBUSY;
-	return 0;
-}
-
 static int stmmac_ethtool_get_regs_len(struct net_device *dev)
 {
 	struct stmmac_priv *priv = netdev_priv(dev);
@@ -1073,7 +1066,6 @@ static int stmmac_set_tunable(struct net_device *dev,
 static const struct ethtool_ops stmmac_ethtool_ops = {
 	.supported_coalesce_params = ETHTOOL_COALESCE_USECS |
 				     ETHTOOL_COALESCE_MAX_FRAMES,
-	.begin = stmmac_check_if_running,
 	.get_drvinfo = stmmac_ethtool_getdrvinfo,
 	.get_msglevel = stmmac_ethtool_getmsglevel,
 	.set_msglevel = stmmac_ethtool_setmsglevel,
-- 
2.20.1