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qmi_wwan: set FLAG_SEND_ZLP to avoid network initiated disconnect

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[ Upstream commit 245d21190a ]

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>
This commit is contained in:
Bjørn Mork
2017-12-14 19:55:50 +01:00
committed by Greg Kroah-Hartman
parent a9a14b17f7
commit 5ff0741646
1 changed files with 2 additions and 2 deletions
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4
drivers/net/usb/qmi_wwan.c
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@@ -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_info = {
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,