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From: Andrew Halaney <ahalaney@redhat.com>
Date: Mon, 29 Apr 2024 16:45:05 -0500
Subject: [PATCH RFC/RFT net-next] net: stmmac: drop the ethtool begin()
 callback
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Message-Id: <20240429-stmmac-no-ethtool-begin-v1-1-04c629c1c142@redhat.com>
To: Alexandre Torgue <alexandre.torgue@foss.st.com>, 
 Jose Abreu <joabreu@synopsys.com>, "David S. Miller" <davem@davemloft.net>, 
 Eric Dumazet <edumazet@google.com>, Jakub Kicinski <kuba@kernel.org>, 
 Paolo Abeni <pabeni@redhat.com>, 
 Maxime Coquelin <mcoquelin.stm32@gmail.com>, 
 Abhishek Chauhan <quic_abchauha@quicinc.com>, 
 Sagar Cheluvegowda <quic_scheluve@quicinc.com>
Cc: netdev@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, 
 linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, 
 Andrew Halaney <ahalaney@redhat.com>

This callback doesn't seem to serve much purpose, and prevents things
like:

    - systemd.link files from disabling autonegotiation
    - carrier detection in NetworkManager

prior to userspace bringing the link up.

The only fear I can think of is accessing unclocked resources due to
pm_runtime, but ethtool ioctls handle that as of commit
f32a21376573 ("ethtool: runtime-resume netdev parent before ethtool ioctl ops")

Signed-off-by: Andrew Halaney <ahalaney@redhat.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 542e2633a6f5..c2e2723f7c6a 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c
@@ -438,13 +438,6 @@ 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);
@@ -1273,7 +1266,6 @@ 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,

---
base-commit: a59668a9397e7245b26e9be85d23f242ff757ae8
change-id: 20240424-stmmac-no-ethtool-begin-f306f2f1f2f4

Best regards,
-- 
Andrew Halaney <ahalaney@redhat.com>