linux-kernel - [PATCH 3/3] drivers/net/ftgmac100: fix DHCP potential failure with systemd

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Message-Id: <20220223031436.124858-4-guoheyi@linux.alibaba.com>
Date:   Wed, 23 Feb 2022 11:14:36 +0800
From:   Heyi Guo <guoheyi@...ux.alibaba.com>
To:     linux-kernel@...r.kernel.org
Cc:     Heyi Guo <guoheyi@...ux.alibaba.com>, Andrew Lunn <andrew@...n.ch>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Joel Stanley <joel@....id.au>,
        Guangbin Huang <huangguangbin2@...wei.com>,
        Hao Chen <chenhao288@...ilicon.com>,
        Arnd Bergmann <arnd@...db.de>,
        Dylan Hung <dylan_hung@...eedtech.com>, netdev@...r.kernel.org
Subject: [PATCH 3/3] drivers/net/ftgmac100: fix DHCP potential failure with systemd

DHCP failures were observed with systemd 247.6. The issue could be
reproduced by rebooting Aspeed 2600 and then running ifconfig ethX
down/up.

It is caused by below procedures in the driver:

1. ftgmac100_open() enables net interface and call phy_start()
2. When PHY is link up, it calls netif_carrier_on() and then
adjust_link callback
3. ftgmac100_adjust_link() will schedule the reset task
4. ftgmac100_reset_task() will then reset the MAC in another schedule

After step 2, systemd will be notified to send DHCP discover packet,
while the packet might be corrupted by MAC reset operation in step 4.

Call ftgmac100_reset() directly instead of scheduling task to fix the
issue.

Signed-off-by: Heyi Guo <guoheyi@...ux.alibaba.com>
---
Cc: Andrew Lunn <andrew@...n.ch>
Cc: "David S. Miller" <davem@...emloft.net>
Cc: Jakub Kicinski <kuba@...nel.org>
Cc: Joel Stanley <joel@....id.au>
Cc: Guangbin Huang <huangguangbin2@...wei.com>
Cc: Hao Chen <chenhao288@...ilicon.com>
Cc: Arnd Bergmann <arnd@...db.de>
Cc: Dylan Hung <dylan_hung@...eedtech.com>
Cc: netdev@...r.kernel.org


---
 drivers/net/ethernet/faraday/ftgmac100.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/faraday/ftgmac100.c b/drivers/net/ethernet/faraday/ftgmac100.c
index c1deb6e5d26c5..d5356db7539a4 100644
--- a/drivers/net/ethernet/faraday/ftgmac100.c
+++ b/drivers/net/ethernet/faraday/ftgmac100.c
@@ -1402,8 +1402,17 @@ static void ftgmac100_adjust_link(struct net_device *netdev)
 	/* Disable all interrupts */
 	iowrite32(0, priv->base + FTGMAC100_OFFSET_IER);
 
-	/* Reset the adapter asynchronously */
-	schedule_work(&priv->reset_task);
+	/* Release phy lock to allow ftgmac100_reset to aquire it, keeping lock
+	 * order consistent to prevent dead lock.
+	 */
+	if (netdev->phydev)
+		mutex_unlock(&netdev->phydev->lock);
+
+	ftgmac100_reset(priv);
+
+	if (netdev->phydev)
+		mutex_lock(&netdev->phydev->lock);
+
 }
 
 static int ftgmac100_mii_probe(struct net_device *netdev)
-- 
2.17.1