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From: "Russell King (Oracle)" <rmk+kernel@armlinux.org.uk>
To: Serge Semin <fancer.lancer@gmail.com>
Cc: Andrew Halaney <ahalaney@redhat.com>,
	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>,
	netdev@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com,
	linux-arm-kernel@lists.infradead.org
Subject: [PATCH net-next v2 4/6] net: stmmac: remove unnecessary netif_carrier_off()
Date: Wed, 29 May 2024 09:40:49 +0100	[thread overview]
Message-ID: <E1sCErZ-00EOPx-PF@rmk-PC.armlinux.org.uk> (raw)
In-Reply-To: <Zlbp7xdUZAXblOZJ@shell.armlinux.org.uk>

It is incorrect to call netif_carrier_off(), or in fact any driver
teardown, before unregister_netdev() has been called.

unregister_netdev() unpublishes the network device from userspace, and
takes the interface down if it was up prior to returning. Therefore,
once the call has returned, we are guaranteed that .ndo_stop() will
have been called for an interface that was up. Phylink will take the
carrier down via phylink_stop(), making any manipulation of the carrier
in the remove path unnecessary.

In the stmmac_release() path, the netif_carrier_off() call follows the
call to phylink_stop(), so this call is redundant.

Reviewed-by: Andrew Halaney <ahalaney@redhat.com>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 3ab93f89be90..ca19b232431a 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -4088,8 +4088,6 @@ static int stmmac_release(struct net_device *dev)
 	if (priv->plat->serdes_powerdown)
 		priv->plat->serdes_powerdown(dev, priv->plat->bsp_priv);
 
-	netif_carrier_off(dev);
-
 	stmmac_release_ptp(priv);
 
 	pm_runtime_put(priv->device);
@@ -7806,7 +7804,6 @@ void stmmac_dvr_remove(struct device *dev)
 
 	stmmac_stop_all_dma(priv);
 	stmmac_mac_set(priv, priv->ioaddr, false);
-	netif_carrier_off(ndev);
 	unregister_netdev(ndev);
 
 #ifdef CONFIG_DEBUG_FS
-- 
2.30.2


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WARNING: multiple messages have this Message-ID (diff)
From: "Russell King (Oracle)" <rmk+kernel@armlinux.org.uk>
To: Serge Semin <fancer.lancer@gmail.com>
Cc: Andrew Halaney <ahalaney@redhat.com>,
	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>,
	netdev@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com,
	linux-arm-kernel@lists.infradead.org
Subject: [PATCH net-next v2 4/6] net: stmmac: remove unnecessary netif_carrier_off()
Date: Wed, 29 May 2024 09:40:49 +0100	[thread overview]
Message-ID: <E1sCErZ-00EOPx-PF@rmk-PC.armlinux.org.uk> (raw)
In-Reply-To: <Zlbp7xdUZAXblOZJ@shell.armlinux.org.uk>

It is incorrect to call netif_carrier_off(), or in fact any driver
teardown, before unregister_netdev() has been called.

unregister_netdev() unpublishes the network device from userspace, and
takes the interface down if it was up prior to returning. Therefore,
once the call has returned, we are guaranteed that .ndo_stop() will
have been called for an interface that was up. Phylink will take the
carrier down via phylink_stop(), making any manipulation of the carrier
in the remove path unnecessary.

In the stmmac_release() path, the netif_carrier_off() call follows the
call to phylink_stop(), so this call is redundant.

Reviewed-by: Andrew Halaney <ahalaney@redhat.com>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 3ab93f89be90..ca19b232431a 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -4088,8 +4088,6 @@ static int stmmac_release(struct net_device *dev)
 	if (priv->plat->serdes_powerdown)
 		priv->plat->serdes_powerdown(dev, priv->plat->bsp_priv);
 
-	netif_carrier_off(dev);
-
 	stmmac_release_ptp(priv);
 
 	pm_runtime_put(priv->device);
@@ -7806,7 +7804,6 @@ void stmmac_dvr_remove(struct device *dev)
 
 	stmmac_stop_all_dma(priv);
 	stmmac_mac_set(priv, priv->ioaddr, false);
-	netif_carrier_off(ndev);
 	unregister_netdev(ndev);
 
 #ifdef CONFIG_DEBUG_FS
-- 
2.30.2


  parent reply	other threads:[~2024-05-29  8:41 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-05-29  8:40 [PATCH net-next v2 0/6] net: stmmac: cleanups Russell King (Oracle)
2024-05-29  8:40 ` Russell King (Oracle)
2024-05-29  8:40 ` [PATCH net-next v2 1/6] net: stmmac: Drop TBI/RTBI PCS flags Russell King
2024-05-29  8:40   ` Russell King
2024-05-29  8:40 ` [PATCH net-next v2 2/6] net: stmmac: dwxgmac2: remove useless NULL pointer initialisations Russell King (Oracle)
2024-05-29  8:40   ` Russell King (Oracle)
2024-05-29  8:40 ` [PATCH net-next v2 3/6] net: stmmac: remove pcs_rane() method Russell King (Oracle)
2024-05-29  8:40   ` Russell King (Oracle)
2024-05-29  8:40 ` Russell King (Oracle) [this message]
2024-05-29  8:40   ` [PATCH net-next v2 4/6] net: stmmac: remove unnecessary netif_carrier_off() Russell King (Oracle)
2024-05-29  8:40 ` [PATCH net-next v2 5/6] net: stmmac: include linux/io.h rather than asm/io.h Russell King (Oracle)
2024-05-29  8:40   ` Russell King (Oracle)
2024-05-29  8:40 ` [PATCH net-next v2 6/6] net: stmmac: ethqos: clean up setting serdes speed Russell King (Oracle)
2024-05-29  8:40   ` Russell King (Oracle)
2024-05-29 21:44   ` Andrew Halaney
2024-05-29 21:44     ` Andrew Halaney
2024-05-29  9:05 ` [PATCH net-next v2 0/6] net: stmmac: cleanups Serge Semin
2024-05-29  9:05   ` Serge Semin
2024-05-31  1:40 ` patchwork-bot+netdevbpf
2024-05-31  1:40   ` patchwork-bot+netdevbpf

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