tree 58ba28e0df0ff650c90376f686b1387a3cd7f525
parent de693d02ee44920aaa2e33f9d7b482acd437fb75
author Daniel Starke <daniel.starke@siemens.com> 1656656210 +0200
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1661418684 +0200

tty: n_gsm: fix packet re-transmission without open control channel

[ Upstream commit 4fae831b3a71fc5a44cc5c7d0b8c1267ee7659f5 ]

In the current implementation control packets are re-transmitted even if
the control channel closed down during T2. This is wrong.
Check whether the control channel is open before re-transmitting any
packets. Note that control channel open/close is handled by T1 and not T2
and remains unaffected by this.

Fixes: e1eaea46bb40 ("tty: n_gsm line discipline")
Signed-off-by: Daniel Starke <daniel.starke@siemens.com>
Link: https://lore.kernel.org/r/20220701061652.39604-7-daniel.starke@siemens.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>