Patch "qmi_wwan: set FLAG_SEND_ZLP to avoid network initiated disconnect" has been added to the 4.9-stable tree

This is a note to let you know that I've just added the patch titled

qmi_wwan: set FLAG_SEND_ZLP to avoid network initiated disconnect

to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
qmi_wwan-set-flag_send_zlp-to-avoid-network-initiated-disconnect.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: "Bj�rn Mork" <[email protected]>
Date: Thu, 14 Dec 2017 19:55:50 +0100
Subject: qmi_wwan: set FLAG_SEND_ZLP to avoid network initiated disconnect

From: "Bj�rn Mork" <[email protected]>

[ Upstream commit 245d21190aec547c0de64f70c0e6de871c185a24 ]

It has been reported that the dummy byte we add to avoid ZLPs can be forwarded by the modem to the PGW/GGSN, and that some operators will drop the connection if this happens.

In theory, QMI devices are based on CDC ECM and should as such both support ZLPs and silently ignore the dummy byte. The latter assumption failed. Let's test out the first.

---
 drivers/net/usb/qmi_wwan.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

@@ -531,7 +531,7 @@ err:
 
 static const struct driver_info	qmi_wwan_info = {
 	.description	= "WWAN/QMI device",
-	.flags		= FLAG_WWAN,
+	.flags		= FLAG_WWAN | FLAG_SEND_ZLP,
 	.bind		= qmi_wwan_bind,
 	.unbind		= qmi_wwan_unbind,
 	.manage_power	= qmi_wwan_manage_power,

@@ -540,7 +540,7 @@ static const struct driver_info	qmi_wwan
 
 static const struct driver_info	qmi_wwan_info_quirk_dtr = {
 	.description	= "WWAN/QMI device",
-	.flags		= FLAG_WWAN,
+	.flags		= FLAG_WWAN | FLAG_SEND_ZLP,
 	.bind		= qmi_wwan_bind,
 	.unbind		= qmi_wwan_unbind,
 	.manage_power	= qmi_wwan_manage_power,

Patches currently in stable-queue which might be from [email protected] are

queue-4.9/qmi_wwan-set-flag_send_zlp-to-avoid-network-initiated-disconnect.patch