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Date: Fri, 8 Nov 2019 19:50:26 +0100 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Daniel Wagner <dwagner@...e.de>, Andrew Lunn <andrew@...n.ch>, "David S. Miller" <davem@...emloft.net> Subject: [PATCH 4.14 38/62] net: usb: lan78xx: Connect PHY before registering MAC From: Andrew Lunn <andrew@...n.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 <dwagner@...e.de> Signed-off-by: Andrew Lunn <andrew@...n.ch> Tested-by: Daniel Wagner <dwagner@...e.de> Signed-off-by: David S. Miller <davem@...emloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- drivers/net/usb/lan78xx.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) --- a/drivers/net/usb/lan78xx.c +++ b/drivers/net/usb/lan78xx.c @@ -3642,10 +3642,14 @@ static int lan78xx_probe(struct usb_inte /* 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); @@ -3658,14 +3662,10 @@ static int lan78xx_probe(struct usb_inte 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:
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