linux-kernel - [PATCH v4 2/2] net: mdio: rework mdio_uevent for mdio ethernet phy device

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Message-Id: <1638609208-10339-2-git-send-email-zhuyinbo@loongson.cn>
Date:   Sat,  4 Dec 2021 17:13:28 +0800
From:   Yinbo Zhu <zhuyinbo@...ngson.cn>
To:     Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-kbuild@...r.kernel.org
Cc:     zhuyinbo@...ngson.cn
Subject: [PATCH v4 2/2] net: mdio: rework mdio_uevent for mdio ethernet phy device

The of_device_uevent_modalias is service for 'of' type platform driver
, which ask the first args must be 'of' that use MODULE_DEVICE_TABLE
when driver was exported, but ethernet phy is a kind of 'mdio' type
device and it is inappropriate if driver use 'of' type for exporting,
in fact, most mainstream ethernet phy driver hasn't used 'of' type,
even though phy driver was exported use 'of' type and it's irrelevant
with mdio_uevent, at this time, platform_uevent was responsible for
reporting uevent to match modules.alias configure, so, whatever that
of_device_uevent_modalias was unnecessary, this patch was to remove it
and add phy_id as modio uevent then ethernet phy module auto load
function will work well.

Signed-off-by: Yinbo Zhu <zhuyinbo@...ngson.cn>
---

 drivers/net/phy/mdio_bus.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/net/phy/mdio_bus.c b/drivers/net/phy/mdio_bus.c
index 6865d93..999f0d4 100644
--- a/drivers/net/phy/mdio_bus.c
+++ b/drivers/net/phy/mdio_bus.c
@@ -962,12 +962,12 @@ static int mdio_bus_match(struct device *dev, struct device_driver *drv)
 
 static int mdio_uevent(struct device *dev, struct kobj_uevent_env *env)
 {
-	int rc;
+	struct phy_device *pdev;
 
-	/* Some devices have extra OF data and an OF-style MODALIAS */
-	rc = of_device_uevent_modalias(dev, env);
-	if (rc != -ENODEV)
-		return rc;
+	pdev = to_phy_device(dev);
+
+	if (add_uevent_var(env, "MODALIAS=mdio:p%08X", pdev->phy_id))
+		return -ENOMEM;
 
 	return 0;
 }
@@ -991,7 +991,7 @@ static int mdio_uevent(struct device *dev, struct kobj_uevent_env *env)
 };
 
 struct bus_type mdio_bus_type = {
-	.name		= "mdio_bus",
+	.name		= "mdio",
 	.dev_groups	= mdio_bus_dev_groups,
 	.match		= mdio_bus_match,
 	.uevent		= mdio_uevent,
-- 
1.8.3.1