[PATCH AUTOSEL 4.19 56/59] net: usb: lan78xx: Connect PHY before registering MAC
From: Sasha Levin <sashal@kernel.org>
Date: 2019-10-26 13:28:07
Also in:
linux-usb, lkml, stable
Subsystem:
networking drivers, the rest, usb lan78xx ethernet driver, usb networking drivers · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds, Thangaraj Samynathan, Rengarajan Sundararajan
From: Andrew Lunn <andrew@lunn.ch>
[ Upstream commit 38b4fe320119859c11b1dc06f6b4987a16344fa1 ]
As soon as the netdev is registers, the kernel can start using the
interface. If the driver connects the MAC to the PHY after the netdev
is registered, there is a race condition where the interface can be
opened without having the PHY connected.
Change the order to close this race condition.
Fixes: 92571a1aae40 ("lan78xx: Connect phy early")
Reported-by: Daniel Wagner <redacted>
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Tested-by: Daniel Wagner <redacted>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/usb/lan78xx.c | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)
diff --git a/drivers/net/usb/lan78xx.c b/drivers/net/usb/lan78xx.c
index e20266bd209e2..06d2499ba127c 100644
--- a/drivers/net/usb/lan78xx.c
+++ b/drivers/net/usb/lan78xx.c@@ -3796,10 +3796,14 @@ static int lan78xx_probe(struct usb_interface *intf, /* driver requires remote-wakeup capability during autosuspend. */ intf->needs_remote_wakeup = 1; + ret = lan78xx_phy_init(dev); + if (ret < 0) + goto out4; + ret = register_netdev(netdev); if (ret != 0) { netif_err(dev, probe, netdev, "couldn't register the device\n"); - goto out4; + goto out5; } usb_set_intfdata(intf, dev);
@@ -3812,14 +3816,10 @@ static int lan78xx_probe(struct usb_interface *intf, pm_runtime_set_autosuspend_delay(&udev->dev, DEFAULT_AUTOSUSPEND_DELAY); - ret = lan78xx_phy_init(dev); - if (ret < 0) - goto out5; - return 0; out5: - unregister_netdev(netdev); + phy_disconnect(netdev->phydev); out4: usb_free_urb(dev->urb_intr); out3:
--
2.20.1