[PATCH v2] greybus: es2: drop redundant device reference

[Johan Hovold]

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@xxxxxxxxxx>
---

Changes in v2
 - drop temporary udev variable as reported by the kernel test robot
   (W=1 warning)


 drivers/greybus/es2.c | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/drivers/greybus/es2.c b/drivers/greybus/es2.c
index 6ae0ac828afa..a97868009191 100644
--- a/drivers/greybus/es2.c
+++ b/drivers/greybus/es2.c
@@ -772,7 +772,6 @@ static int check_urb_status(struct urb *urb)
 
 static void es2_destroy(struct es2_ap_dev *es2)
 {
-	struct usb_device *udev;
 	struct urb *urb;
 	int i;
 
@@ -804,10 +803,7 @@ static void es2_destroy(struct es2_ap_dev *es2)
 	gb_hd_cport_release_reserved(es2->hd, ES2_CPORT_CDSI1);
 	gb_hd_cport_release_reserved(es2->hd, ES2_CPORT_CDSI0);
 
-	udev = es2->usb_dev;
 	gb_hd_put(es2->hd);
-
-	usb_put_dev(udev);
 }
 
 static void cport_in_callback(struct urb *urb)
@@ -1257,7 +1253,7 @@ static int ap_probe(struct usb_interface *interface,
 	bool bulk_in_found = false;
 	bool arpc_in_found = false;
 
-	udev = usb_get_dev(interface_to_usbdev(interface));
+	udev = interface_to_usbdev(interface);
 
 	num_cports = apb_get_cport_count(udev);
 	if (num_cports < 0) {
-- 
2.52.0