linux-kernel - [PATCH] usb: gadget: u_ether: Continue to send skbs if remote wakeup fails

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Message-Id: <20250503141958.584143-1-zlyang_001@163.com>
Date: Sat,  3 May 2025 22:19:58 +0800
From: Zhilin Yang <zlyang_001@....com>
To: gregkh@...uxfoundation.org
Cc: linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Zhilin Yang <zlyang_001@....com>
Subject: [PATCH] usb: gadget: u_ether: Continue to send skbs if remote wakeup fails

While UDC suspends, u_ether attempts to remote wakeup the host if there
are any pending transfers. If there are no pending transfers, the
is_suspend flag is set. If the is_suspend flag is set, it attempts to
wakeup the host when start to transmit skbs. However, if wakeup fails,
for example, wakeup is not supported, skbs will never be sent.

To fix this, stop to queue skbs and return NETDEV_TX_BUSY only if remote
wakeup operation is successful.

Fixes: 17c2c87c3786 ("usb: gadget: u_ether: Set is_suspend flag if remote wakeup fails")
Signed-off-by: Zhilin Yang <zlyang_001@....com>
---
 drivers/usb/gadget/function/u_ether.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/usb/gadget/function/u_ether.c b/drivers/usb/gadget/function/u_ether.c
index f58590bf5e02..9d746ed3f072 100644
--- a/drivers/usb/gadget/function/u_ether.c
+++ b/drivers/usb/gadget/function/u_ether.c
@@ -473,10 +473,11 @@ static netdev_tx_t eth_start_xmit(struct sk_buff *skb,
 
 	if (dev->port_usb && dev->port_usb->is_suspend) {
 		DBG(dev, "Port suspended. Triggering wakeup\n");
-		netif_stop_queue(net);
-		spin_unlock_irqrestore(&dev->lock, flags);
-		ether_wakeup_host(dev->port_usb);
-		return NETDEV_TX_BUSY;
+		if (!ether_wakeup_host(dev->port_usb)) {
+			netif_stop_queue(net);
+			spin_unlock_irqrestore(&dev->lock, flags);
+			return NETDEV_TX_BUSY;
+		}
 	}
 
 	spin_unlock_irqrestore(&dev->lock, flags);
-- 
2.25.1