tty: n_gsm: fix missing timer to handle stalled links

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[ Upstream commit c568f7086c ]

The current implementation does not handle the situation that no data is in
the internal queue and needs to be sent out while the user tty fifo is
full.
Add a timer that moves more data from user tty down to the internal queue
which is then serialized on the ldisc. This timer is triggered if no data
was moved from a user tty to the internal queue within 10 * T1.

Fixes: e1eaea46bb ("tty: n_gsm line discipline")
Signed-off-by: Daniel Starke <daniel.starke@siemens.com>
Link: https://lore.kernel.org/r/20220701061652.39604-4-daniel.starke@siemens.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Daniel Starke 2022-07-01 08:16:47 +02:00 • committed by Greg Kroah-Hartman

parent e5e1eed823

commit 692e847a8e

1 changed files with 35 additions and 8 deletions

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drivers/tty/n_gsm.c

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