gpib: agilent_82357a: 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/20260305102745.12032-2-johan@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/gpib/agilent_82357a/agilent_82357a.c b/drivers/gpib/agilent_82357a/agilent_82357a.c
index e1349afbf9333fda9cb8ee78880cfcaa00b76608..770ba6eb40d1dab0e4cb431b4bab83a173f2c4b9 100644 (file)
--- a/drivers/gpib/agilent_82357a/agilent_82357a.c
+++ b/drivers/gpib/agilent_82357a/agilent_82357a.c
@@ -1479,7 +1479,7 @@ static int agilent_82357a_driver_probe(struct usb_interface *interface,
 
        if (mutex_lock_interruptible(&agilent_82357a_hotplug_lock))
                return -ERESTARTSYS;
-       usb_dev = usb_get_dev(interface_to_usbdev(interface));
+       usb_dev = interface_to_usbdev(interface);
        for (i = 0; i < MAX_NUM_82357A_INTERFACES; ++i) {
                if (!agilent_82357a_driver_interfaces[i]) {
                        agilent_82357a_driver_interfaces[i] = interface;
@@ -1490,14 +1490,12 @@ static int agilent_82357a_driver_probe(struct usb_interface *interface,
                }
        }
        if (i == MAX_NUM_82357A_INTERFACES) {
-               usb_put_dev(usb_dev);
                mutex_unlock(&agilent_82357a_hotplug_lock);
                dev_err(&usb_dev->dev, "out of space in agilent_82357a_driver_interfaces[]\n");
                return -1;
        }
        path = kmalloc(path_length, GFP_KERNEL);
        if (!path) {
-               usb_put_dev(usb_dev);
                mutex_unlock(&agilent_82357a_hotplug_lock);
                return -ENOMEM;
        }
@@ -1539,7 +1537,6 @@ static void agilent_82357a_driver_disconnect(struct usb_interface *interface)
        }
        if (i == MAX_NUM_82357A_INTERFACES)
                dev_err(&usb_dev->dev, "unable to find interface - bug?\n");
-       usb_put_dev(usb_dev);
 
        mutex_unlock(&agilent_82357a_hotplug_lock);
 }