linux-kernel - [PATCH v2 2/2] Revert "usb: gadget: u_ether: Replace netif_stop_queue with netif_device

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Message-ID: <20240620203954.20254-3-ftoth@exalondelft.nl>
Date: Thu, 20 Jun 2024 22:38:31 +0200
From: Ferry Toth <ftoth@...londelft.nl>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Ferry Toth <ftoth@...londelft.nl>,
	Hardik Gajjar <hgajjar@...adit-jv.com>,
	"Ricardo B. Marliere" <ricardo@...liere.net>,
	Kees Cook <kees@...nel.org>,
	Richard Acayan <mailingradian@...il.com>,
	Linyu Yuan <quic_linyyuan@...cinc.com>,
	Justin Stitt <justinstitt@...gle.com>,
	linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Andy Shevchenko <andriy.shevchenko@...el.com>,
	s.hauer@...gutronix.de,
	jonathanh@...dia.com,
	paul@...pouillou.net,
	quic_eserrao@...cinc.com,
	erosca@...adit-jv.com,
	regressions@...mhuis.info,
	Ferry Toth <fntoth@...il.com>,
	stable@...r.kernel.org
Subject: [PATCH v2 2/2] Revert "usb: gadget: u_ether: Replace netif_stop_queue with netif_device_detach"

This reverts commit f49449fbc21e7e9550a5203902d69c8ae7dfd918.

This commit breaks u_ether on some setups (at least Merrifield). The fix
"usb: gadget: u_ether: Re-attach netif device to mirror detachment" party
restores u-ether. However the netif usb: remains up even usb is switched
from device to host mode. This creates problems for user space as the
interface remains in the routing table while not realy present and network
managers (connman) not detecting a network change.

Various attempts to find the root cause were unsuccesful up to now. Therefore
revert until a solution is found.

Link: https://lore.kernel.org/linux-usb/20231006141231.7220-1-hgajjar@de.adit-jv.com/
Reported-by: Andy Shevchenko <andriy.shevchenko@...el.com>
Reported-by: Ferry Toth <fntoth@...il.com>
Fixes: f49449fbc21e ("usb: gadget: u_ether: Replace netif_stop_queue with netif_device_detach")
Cc: stable@...r.kernel.org
---
 drivers/usb/gadget/function/u_ether.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/gadget/function/u_ether.c b/drivers/usb/gadget/function/u_ether.c
index aa0511c3a62c..95191083b455 100644
--- a/drivers/usb/gadget/function/u_ether.c
+++ b/drivers/usb/gadget/function/u_ether.c
@@ -1200,7 +1200,7 @@ void gether_disconnect(struct gether *link)
 
 	DBG(dev, "%s\n", __func__);
 
-	netif_device_detach(dev->net);
+	netif_stop_queue(dev->net);
 	netif_carrier_off(dev->net);
 
 	/* disable endpoints, forcing (synchronous) completion
-- 
2.43.0