From: Daniele Palmas <dnlplm@gmail.com>
Date: Thu, 31 May 2018 11:18:29 +0200
Subject: net: usb: cdc_mbim: add flag FLAG_SEND_ZLP
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Git-commit: 9f7c728332e8966084242fcd951aa46583bc308c
Patch-mainline: v4.17
References: networking-stable-18_06_08

Testing Telit LM940 with ICMP packets > 14552 bytes revealed that
the modem needs FLAG_SEND_ZLP to properly work, otherwise the cdc
mbim data interface won't be anymore responsive.

Signed-off-by: Daniele Palmas <dnlplm@gmail.com>
Acked-by: Bjørn Mork <bjorn@mork.no>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
 drivers/net/usb/cdc_mbim.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/usb/cdc_mbim.c
+++ b/drivers/net/usb/cdc_mbim.c
@@ -609,7 +609,7 @@ static const struct driver_info cdc_mbim
  */
 static const struct driver_info cdc_mbim_info_avoid_altsetting_toggle = {
 	.description = "CDC MBIM",
-	.flags = FLAG_NO_SETINT | FLAG_MULTI_PACKET | FLAG_WWAN,
+	.flags = FLAG_NO_SETINT | FLAG_MULTI_PACKET | FLAG_WWAN | FLAG_SEND_ZLP,
 	.bind = cdc_mbim_bind,
 	.unbind = cdc_mbim_unbind,
 	.manage_power = cdc_mbim_manage_power,