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Message-Id: <20230717152709.574773-11-vladimir.oltean@nxp.com>
Date: Mon, 17 Jul 2023 18:27:07 +0300
From: Vladimir Oltean <vladimir.oltean@....com>
To: netdev@...r.kernel.org
Cc: "David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>, Andrew Lunn <andrew@...n.ch>,
Florian Fainelli <f.fainelli@...il.com>,
Maxim Georgiev <glipus@...il.com>,
Horatiu Vultur <horatiu.vultur@...rochip.com>,
Köry Maincent <kory.maincent@...tlin.com>,
Maxime Chevallier <maxime.chevallier@...tlin.com>,
Richard Cochran <richardcochran@...il.com>,
Vadim Fedorenko <vadim.fedorenko@...ux.dev>,
Gerhard Engleder <gerhard@...leder-embedded.com>,
Hangbin Liu <liuhangbin@...il.com>,
Russell King <linux@...linux.org.uk>,
Heiner Kallweit <hkallweit1@...il.com>,
Jacob Keller <jacob.e.keller@...el.com>,
Jay Vosburgh <j.vosburgh@...il.com>,
Andy Gospodarek <andy@...yhouse.net>,
Wei Fang <wei.fang@....com>,
Shenwei Wang <shenwei.wang@....com>,
Clark Wang <xiaoning.wang@....com>,
NXP Linux Team <linux-imx@....com>,
UNGLinuxDriver@...rochip.com,
Lars Povlsen <lars.povlsen@...rochip.com>,
Steen Hegelund <Steen.Hegelund@...rochip.com>,
Daniel Machon <daniel.machon@...rochip.com>,
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Sergey Organov <sorganov@...il.com>,
Michal Kubecek <mkubecek@...e.cz>,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH v8 net-next 10/12] net: transfer rtnl_lock() requirement from ethtool_set_ethtool_phy_ops() to caller
phy_init() and phy_exit() will have to do more stuff under rtnl_lock()
in a future change. Since rtnl_unlock() -> netdev_run_todo() does a lot
of stuff under the hood, it's a pity to lock and unlock the rtnetlink
mutex twice in a row.
Change the calling convention such that the only caller of
ethtool_set_ethtool_phy_ops(), phy_device.c, provides a context where
the rtnl_mutex is already acquired.
Note that phy_exit() wasn't performing the opposite teardown of
phy_init(). Reverse mdio_bus_init() with ethtool_set_ethtool_phy_ops(),
so that this is now the case.
Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
Changes in v8:
- Patch is new
drivers/net/phy/phy_device.c | 8 +++++++-
net/ethtool/common.c | 3 +--
2 files changed, 8 insertions(+), 3 deletions(-)
diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index 0c2014accba7..ab53d10f1844 100644
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -30,6 +30,7 @@
#include <linux/phy_led_triggers.h>
#include <linux/pse-pd/pse.h>
#include <linux/property.h>
+#include <linux/rtnetlink.h>
#include <linux/sfp.h>
#include <linux/skbuff.h>
#include <linux/slab.h>
@@ -3451,11 +3452,14 @@ static int __init phy_init(void)
{
int rc;
+ rtnl_lock();
+ ethtool_set_ethtool_phy_ops(&phy_ethtool_phy_ops);
+ rtnl_unlock();
+
rc = mdio_bus_init();
if (rc)
return rc;
- ethtool_set_ethtool_phy_ops(&phy_ethtool_phy_ops);
features_init();
rc = phy_driver_register(&genphy_c45_driver, THIS_MODULE);
@@ -3477,7 +3481,9 @@ static void __exit phy_exit(void)
phy_driver_unregister(&genphy_c45_driver);
phy_driver_unregister(&genphy_driver);
mdio_bus_exit();
+ rtnl_lock();
ethtool_set_ethtool_phy_ops(NULL);
+ rtnl_unlock();
}
subsys_initcall(phy_init);
diff --git a/net/ethtool/common.c b/net/ethtool/common.c
index 5fb19050991e..f5598c5f50de 100644
--- a/net/ethtool/common.c
+++ b/net/ethtool/common.c
@@ -665,9 +665,8 @@ const struct ethtool_phy_ops *ethtool_phy_ops;
void ethtool_set_ethtool_phy_ops(const struct ethtool_phy_ops *ops)
{
- rtnl_lock();
+ ASSERT_RTNL();
ethtool_phy_ops = ops;
- rtnl_unlock();
}
EXPORT_SYMBOL_GPL(ethtool_set_ethtool_phy_ops);
--
2.34.1
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