linux-kernel - [PATCH][6.2] Revert "usb: gadget: u_ether: Do not make UDC parent of the net device"

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Date:   Thu,  9 Feb 2023 10:56:26 +0000
From:   Paul Cercueil <paul@...pouillou.net>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Paul Cercueil <paul@...pouillou.net>,
        Sascha Hauer <s.hauer@...gutronix.de>
Subject: [PATCH][6.2] Revert "usb: gadget: u_ether: Do not make UDC parent of the net device"

This reverts commit 321b59870f850a10dbb211ecd2bd87b41497ea6f.

This commit broke USB networking on Ingenic SoCs and maybe elsewhere.
The actual reason is unknown; and while a proper fix would be better,
we're sitting at -rc7 now, so a revert is justified - and we can work on
re-introducing this change for 6.3.

Fixes: 321b59870f85 ("usb: gadget: u_ether: Do not make UDC parent of the net device")
Signed-off-by: Paul Cercueil <paul@...pouillou.net>
Cc: Sascha Hauer <s.hauer@...gutronix.de>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/usb/gadget/function/u_ether.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/usb/gadget/function/u_ether.c b/drivers/usb/gadget/function/u_ether.c
index 8f12f3f8f6ee..e06022873df1 100644
--- a/drivers/usb/gadget/function/u_ether.c
+++ b/drivers/usb/gadget/function/u_ether.c
@@ -798,6 +798,7 @@ struct eth_dev *gether_setup_name(struct usb_gadget *g,
 	net->max_mtu = GETHER_MAX_MTU_SIZE;
 
 	dev->gadget = g;
+	SET_NETDEV_DEV(net, &g->dev);
 	SET_NETDEV_DEVTYPE(net, &gadget_type);
 
 	status = register_netdev(net);
@@ -872,6 +873,8 @@ int gether_register_netdev(struct net_device *net)
 	struct usb_gadget *g;
 	int status;
 
+	if (!net->dev.parent)
+		return -EINVAL;
 	dev = netdev_priv(net);
 	g = dev->gadget;
 
@@ -902,6 +905,7 @@ void gether_set_gadget(struct net_device *net, struct usb_gadget *g)
 
 	dev = netdev_priv(net);
 	dev->gadget = g;
+	SET_NETDEV_DEV(net, &g->dev);
 }
 EXPORT_SYMBOL_GPL(gether_set_gadget);
 
-- 
2.39.1