w1: ds2490: 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/20260305111613.18546-1-johan@kernel.org
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Link: https://patch.msgid.link/20260403084450.6314-2-krzk@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/w1/masters/ds2490.c b/drivers/w1/masters/ds2490.c
index 35e75d07ef5d61e3eda70a6931a5a00230c31b06..aa1f57f743979ba55f9ab5b7b58e077a14f4600b 100644 (file)
--- a/drivers/w1/masters/ds2490.c
+++ b/drivers/w1/masters/ds2490.c
@@ -1022,11 +1022,8 @@ static int ds_probe(struct usb_interface *intf,
        if (!dev)
                return -ENOMEM;
 
-       dev->udev = usb_get_dev(udev);
-       if (!dev->udev) {
-               err = -ENOMEM;
-               goto err_out_free;
-       }
+       dev->udev = udev;
+
        memset(dev->ep, 0, sizeof(dev->ep));
 
        usb_set_intfdata(intf, dev);
@@ -1085,9 +1082,8 @@ static int ds_probe(struct usb_interface *intf,
 
 err_out_clear:
        usb_set_intfdata(intf, NULL);
-       usb_put_dev(dev->udev);
-err_out_free:
        kfree(dev);
+
        return err;
 }
 
@@ -1107,7 +1103,6 @@ static void ds_disconnect(struct usb_interface *intf)
 
        usb_set_intfdata(intf, NULL);
 
-       usb_put_dev(dev->udev);
        kfree(dev);
 }