FAILED: patch "[PATCH] usb: gadget: f_ecm: Fix net_device lifecycle with device_move" failed to apply to 6.1-stable tree

FAILED: patch "[PATCH] usb: gadget: f_ecm: Fix net_device lifecycle with device_move" failed to apply to 6.1-stable tree

[gregkh]

The patch below does not apply to the 6.1-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.1.y
git checkout FETCH_HEAD
git cherry-pick -x b2cc4fae67a51f60d81d6af2678696accb07c656
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2026040803-tassel-exchange-8916@gregkh' --subject-prefix 'PATCH 6.1.y' HEAD^..

Possible dependencies:



thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From b2cc4fae67a51f60d81d6af2678696accb07c656 Mon Sep 17 00:00:00 2001
From: Kuen-Han Tsai <khtsai@google.com>
Date: Fri, 20 Mar 2026 16:54:47 +0800
Subject: [PATCH] usb: gadget: f_ecm: Fix net_device lifecycle with device_move

The net_device is allocated during function instance creation and
registered during the bind phase with the gadget device as its sysfs
parent. When the function unbinds, the parent device is destroyed, but
the net_device survives, resulting in dangling sysfs symlinks:

  console:/ # ls -l /sys/class/net/usb0
  lrwxrwxrwx ... /sys/class/net/usb0 ->
  /sys/devices/platform/.../gadget.0/net/usb0
  console:/ # ls -l /sys/devices/platform/.../gadget.0/net/usb0
  ls: .../gadget.0/net/usb0: No such file or directory

Use device_move() to reparent the net_device between the gadget device
tree and /sys/devices/virtual across bind and unbind cycles. During the
final unbind, calling device_move(NULL) moves the net_device to the
virtual device tree before the gadget device is destroyed. On rebinding,
device_move() reparents the device back under the new gadget, ensuring
proper sysfs topology and power management ordering.

To maintain compatibility with legacy composite drivers (e.g., multi.c),
the bound flag is used to indicate whether the network device is shared
and pre-registered during the legacy driver's bind phase.

Fixes: fee562a6450b ("usb: gadget: f_ecm: convert to new function interface with backward compatibility")
Cc: stable@vger.kernel.org
Signed-off-by: Kuen-Han Tsai <khtsai@google.com>
Link: https://patch.msgid.link/20260320-usb-net-lifecycle-v1-4-4886b578161b@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/gadget/function/f_ecm.c b/drivers/usb/gadget/function/f_ecm.c
index e0c02121374e..e495bac4efeb 100644
--- a/drivers/usb/gadget/function/f_ecm.c
+++ b/drivers/usb/gadget/function/f_ecm.c
@@ -681,6 +681,7 @@ ecm_bind(struct usb_configuration *c, struct usb_function *f)
 	struct usb_ep		*ep;
 
 	struct f_ecm_opts	*ecm_opts;
+	struct net_device	*net __free(detach_gadget) = NULL;
 	struct usb_request	*request __free(free_usb_request) = NULL;
 
 	if (!can_support_ecm(cdev->gadget))
@@ -688,18 +689,18 @@ ecm_bind(struct usb_configuration *c, struct usb_function *f)
 
 	ecm_opts = container_of(f->fi, struct f_ecm_opts, func_inst);
 
-	mutex_lock(&ecm_opts->lock);
+	scoped_guard(mutex, &ecm_opts->lock)
+		if (ecm_opts->bind_count == 0 && !ecm_opts->bound) {
+			if (!device_is_registered(&ecm_opts->net->dev)) {
+				gether_set_gadget(ecm_opts->net, cdev->gadget);
+				status = gether_register_netdev(ecm_opts->net);
+			} else
+				status = gether_attach_gadget(ecm_opts->net, cdev->gadget);
 
-	gether_set_gadget(ecm_opts->net, cdev->gadget);
-
-	if (!ecm_opts->bound) {
-		status = gether_register_netdev(ecm_opts->net);
-		ecm_opts->bound = true;
-	}
-
-	mutex_unlock(&ecm_opts->lock);
-	if (status)
-		return status;
+			if (status)
+				return status;
+			net = ecm_opts->net;
+		}
 
 	ecm_string_defs[1].s = ecm->ethaddr;
 
@@ -790,6 +791,9 @@ ecm_bind(struct usb_configuration *c, struct usb_function *f)
 
 	ecm->notify_req = no_free_ptr(request);
 
+	ecm_opts->bind_count++;
+	retain_and_null_ptr(net);
+
 	DBG(cdev, "CDC Ethernet: IN/%s OUT/%s NOTIFY/%s\n",
 			ecm->port.in_ep->name, ecm->port.out_ep->name,
 			ecm->notify->name);
@@ -836,7 +840,7 @@ static void ecm_free_inst(struct usb_function_instance *f)
 	struct f_ecm_opts *opts;
 
 	opts = container_of(f, struct f_ecm_opts, func_inst);
-	if (opts->bound)
+	if (device_is_registered(&opts->net->dev))
 		gether_cleanup(netdev_priv(opts->net));
 	else
 		free_netdev(opts->net);
@@ -906,9 +910,12 @@ static void ecm_free(struct usb_function *f)
 static void ecm_unbind(struct usb_configuration *c, struct usb_function *f)
 {
 	struct f_ecm		*ecm = func_to_ecm(f);
+	struct f_ecm_opts	*ecm_opts;
 
 	DBG(c->cdev, "ecm unbind\n");
 
+	ecm_opts = container_of(f->fi, struct f_ecm_opts, func_inst);
+
 	usb_free_all_descriptors(f);
 
 	if (atomic_read(&ecm->notify_count)) {
@@ -918,6 +925,10 @@ static void ecm_unbind(struct usb_configuration *c, struct usb_function *f)
 
 	kfree(ecm->notify_req->buf);
 	usb_ep_free_request(ecm->notify, ecm->notify_req);
+
+	ecm_opts->bind_count--;
+	if (ecm_opts->bind_count == 0 && !ecm_opts->bound)
+		gether_detach_gadget(ecm_opts->net);
 }
 
 static struct usb_function *ecm_alloc(struct usb_function_instance *fi)
diff --git a/drivers/usb/gadget/function/u_ecm.h b/drivers/usb/gadget/function/u_ecm.h
index 77cfb89932be..7f666b9dea02 100644
--- a/drivers/usb/gadget/function/u_ecm.h
+++ b/drivers/usb/gadget/function/u_ecm.h
@@ -15,17 +15,26 @@
 
 #include <linux/usb/composite.h>
 
+/**
+ * struct f_ecm_opts - ECM function options
+ * @func_inst: USB function instance.
+ * @net: The net_device associated with the ECM function.
+ * @bound: True if the net_device is shared and pre-registered during the
+ *         legacy composite driver's bind phase (e.g., multi.c). If false,
+ *         the ECM function will register the net_device during its own
+ *         bind phase.
+ * @bind_count: Tracks the number of configurations the ECM function is
+ *              bound to, preventing double-registration of the @net device.
+ * @lock: Protects the data from concurrent access by configfs read/write
+ *        and create symlink/remove symlink operations.
+ * @refcnt: Reference counter for the function instance.
+ */
 struct f_ecm_opts {
 	struct usb_function_instance	func_inst;
 	struct net_device		*net;
 	bool				bound;
+	int				bind_count;
 
-	/*
-	 * Read/write access to configfs attributes is handled by configfs.
-	 *
-	 * This is to protect the data from concurrent access by read/write
-	 * and create symlink/remove symlink.
-	 */
 	struct mutex			lock;
 	int				refcnt;
 };