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

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

[Paul Cercueil]

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@crapouillou.net>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.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

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

[Sascha Hauer]

On Thu, Feb 09, 2023 at 10:56:26AM +0000, Paul Cercueil wrote:
> 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@crapouillou.net>
> Cc: Sascha Hauer <s.hauer@pengutronix.de>
> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> ---
>  drivers/usb/gadget/function/u_ether.c | 4 ++++
>  1 file changed, 4 insertions(+)

Acked-by: Sascha Hauer <s.hauer@pengutronix.de>

Sascha

> 
> 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
> 
> 

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