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tty: n_gsm: fix missing mux reset on config change at responder

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Currently, only the initiator resets the mux protocol if the user requests
new parameters that are incompatible to those of the current connection.
The responder also needs to reset the multiplexer if the new parameter set
requires this. Otherwise, we end up with an inconsistent parameter set
between initiator and responder.
Revert the old behavior to inform the peer upon an incompatible parameter
set change from the user on the responder side by re-establishing the mux
protocol in such case.

Fixes: 509067bbd2 ("tty: n_gsm: Delete gsm_disconnect when config requester")
Cc: stable@vger.kernel.org
Signed-off-by: Daniel Starke <daniel.starke@siemens.com>
Link: https://lore.kernel.org/r/20220414094225.4527-1-daniel.starke@siemens.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Daniel Starke 2022-04-14 02:42:06 -07:00 committed by Greg Kroah-Hartman
parent ce522ba9ef
commit 11451693e4
1 changed files with 1 additions and 1 deletions
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2
drivers/tty/n_gsm.c
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@ -2373,7 +2373,7 @@ static int gsm_config(struct gsm_mux *gsm, struct gsm_config *c)
* configuration
*/
if (gsm->initiator && (need_close || need_restart)) {
if (need_close || need_restart) {
int ret;
ret = gsm_disconnect(gsm);