tty: n_gsm: fix flow control handling in tx path

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[ Upstream commit 59ff0680ec ]

The current implementation constipates all transmission paths during flow
control except for flow control frames. However, these may not be located
at the beginning of the transmission queue of the control channel.
Ensure that flow control frames in the transmission queue for the control
channel are always handled even if constipated by skipping through other
messages.

Fixes: 0af021678d ("tty: n_gsm: fix deadlock and link starvation in outgoing data path")
Signed-off-by: Daniel Starke <daniel.starke@siemens.com>
Link: https://lore.kernel.org/r/20220707113223.3685-3-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 2022-07-07 13:32:22 +02:00 • committed by Greg Kroah-Hartman

parent e5e39b5244

commit 96114c3b26

1 changed files with 1 additions and 1 deletions

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drivers/tty/n_gsm.c

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