net: usb: lan78xx: drop redundant device reference

Driver core holds a reference to the USB interface and its parent USB
device while the interface is bound to a driver and there is no need to
take additional references unless the structures are needed after
disconnect.

Drop the redundant device reference to reduce cargo culting, make it
easier to spot drivers where an extra reference is needed, and reduce
the risk of memory leaks when drivers fail to release it.

Signed-off-by: Johan Hovold <johan@kernel.org>
Link: https://patch.msgid.link/20260305105006.16415-1-johan@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/usb/lan78xx.c b/drivers/net/usb/lan78xx.c
index a0021df12fde24bd9386cb4339f999b1d0b9b4c0..2b6cb9266945d45c720a3a495c455b637385b571 100644 (file)
--- a/drivers/net/usb/lan78xx.c
+++ b/drivers/net/usb/lan78xx.c
@@ -4530,7 +4530,6 @@ static void intr_complete(struct urb *urb)
 static void lan78xx_disconnect(struct usb_interface *intf)
 {
        struct lan78xx_net *dev;
-       struct usb_device *udev;
        struct net_device *net;
 
        dev = usb_get_intfdata(intf);
@@ -4538,7 +4537,6 @@ static void lan78xx_disconnect(struct usb_interface *intf)
        if (!dev)
                return;
 
-       udev = interface_to_usbdev(intf);
        net = dev->net;
 
        rtnl_lock();
@@ -4567,7 +4565,6 @@ static void lan78xx_disconnect(struct usb_interface *intf)
        usb_free_urb(dev->urb_intr);
 
        free_netdev(net);
-       usb_put_dev(udev);
 }
 
 static void lan78xx_tx_timeout(struct net_device *net, unsigned int txqueue)
@@ -4629,13 +4626,11 @@ static int lan78xx_probe(struct usb_interface *intf,
        u8 *buf = NULL;
 
        udev = interface_to_usbdev(intf);
-       udev = usb_get_dev(udev);
 
        netdev = alloc_etherdev(sizeof(struct lan78xx_net));
        if (!netdev) {
                dev_err(&intf->dev, "Error: OOM\n");
-               ret = -ENOMEM;
-               goto out1;
+               return -ENOMEM;
        }
 
        SET_NETDEV_DEV(netdev, &intf->dev);
@@ -4784,8 +4779,6 @@ out3:
        lan78xx_free_tx_resources(dev);
 out2:
        free_netdev(netdev);
-out1:
-       usb_put_dev(udev);
 
        return ret;
 }