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tty: n_gsm: fix flow control handling in tx path

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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>
This commit is contained in:
Daniel Starke 2022-07-07 13:32:22 +02:00 committed by Greg Kroah-Hartman
parent 18a948c7d9
commit 59ff0680ec
1 changed files with 1 additions and 1 deletions
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2
drivers/tty/n_gsm.c
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@ -891,7 +891,7 @@ static int gsm_data_kick(struct gsm_mux *gsm)
/* Serialize control messages and control channel messages first */
list_for_each_entry_safe(msg, nmsg, &gsm->tx_ctrl_list, list) {
if (gsm->constipated && !gsm_is_flow_ctrl_msg(msg))
return -EAGAIN;
continue;
ret = gsm_send_packet(gsm, msg);
switch (ret) {
case -ENOSPC: