Patch "qmi_wwan: set FLAG_SEND_ZLP to avoid network initiated disconnect" has been added to the 4.14-stable tree

Patch "qmi_wwan: set FLAG_SEND_ZLP to avoid network initiated disconnect" has been added to the 4.14-stable tree

[gregkh]

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 4.14-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-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Thu Mar 22 14:26:48 CET 2018
From: "Bj�rn Mork" <bjorn@mork.no>
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" <bjorn@mork.no>


[ 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.

Signed-off-by: Bjørn Mork <bjorn@mork.no>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/net/usb/qmi_wwan.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/net/usb/qmi_wwan.c
+++ b/drivers/net/usb/qmi_wwan.c
@@ -826,7 +826,7 @@ 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,
@@ -835,7 +835,7 @@ 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 bjorn@mork.no are

queue-4.14/qmi_wwan-set-flag_send_zlp-to-avoid-network-initiated-disconnect.patch