[PATCH v3] net: stmmac: fix 'ethtool -P' return -EBUSY

From: Hao Chen
Date: Mon Jul 19 2021 - 05:00:27 EST


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.

Signed-off-by: Hao Chen <chenhaoa@xxxxxxxxxxxxx>
---
drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c
index d0ce608b81c3..8fbb58c95507 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c
@@ -15,6 +15,7 @@
#include <linux/phylink.h>
#include <linux/net_tstamp.h>
#include <asm/io.h>
+#include <linux/pm_runtime.h>

#include "stmmac.h"
#include "dwmac_dma.h"
@@ -412,8 +413,10 @@ 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;
+ struct stmmac_priv *priv = netdev_priv(dev);
+
+ pm_runtime_get_sync(priv->device);
+
return 0;
}

--
2.20.1