From: Sascha Hauer <s.hauer@pengutronix.de>
Date: Fri, 10 Feb 2023 12:16:31 +0100
Subject: [PATCH] wifi: rtw88: usb: send Zero length packets if necessary
References: bsc#1012628
Patch-mainline: 6.2.2
Git-commit: 07ce9fa6ab0e5e4cb5516a1f7c754ab2758fe5cd

commit 07ce9fa6ab0e5e4cb5516a1f7c754ab2758fe5cd upstream.

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@pengutronix.de>
Reviewed-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20230210111632.1985205-3-s.hauer@pengutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
 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 d9e99554..1a09c928 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);
-- 
2.35.3