netdev - [PATCH v2 2/3] wifi: rtw88: usb: send Zero length packets if necessary

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Date:   Fri, 10 Feb 2023 12:16:31 +0100
From:   Sascha Hauer <s.hauer@...gutronix.de>
To:     linux-wireless@...r.kernel.org
Cc:     Neo Jou <neojou@...il.com>, Hans Ulli Kroll <linux@...i-kroll.de>,
        Ping-Ke Shih <pkshih@...ltek.com>,
        Yan-Hsuan Chuang <tony0620emma@...il.com>,
        Kalle Valo <kvalo@...nel.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        kernel@...gutronix.de, Alexander Hochbaum <alex@...udo.com>,
        Da Xue <da@...re.computer>, Po-Hao Huang <phhuang@...ltek.com>,
        Andreas Henriksson <andreas@...al.se>,
        Viktor Petrenko <g0000ga@...il.com>,
        Sascha Hauer <s.hauer@...gutronix.de>
Subject: [PATCH v2 2/3] wifi: rtw88: usb: send Zero length packets if necessary

Zero length packets are necessary when sending URBs with size
multiple of bulkout_size, otherwise the hardware just stalls.

Fixes: a82dfd33d1237 ("wifi: rtw88: Add common USB chip support")
Signed-off-by: Sascha Hauer <s.hauer@...gutronix.de>
---
 drivers/net/wireless/realtek/rtw88/usb.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/wireless/realtek/rtw88/usb.c b/drivers/net/wireless/realtek/rtw88/usb.c
index d9e995544e405..1a09c9288198a 100644
--- a/drivers/net/wireless/realtek/rtw88/usb.c
+++ b/drivers/net/wireless/realtek/rtw88/usb.c
@@ -271,6 +271,7 @@ static int rtw_usb_write_port(struct rtw_dev *rtwdev, u8 qsel, struct sk_buff *s
 		return -ENOMEM;
 
 	usb_fill_bulk_urb(urb, usbd, pipe, skb->data, skb->len, cb, context);
+	urb->transfer_flags |= URB_ZERO_PACKET;
 	ret = usb_submit_urb(urb, GFP_ATOMIC);
 
 	usb_free_urb(urb);
-- 
2.30.2