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tty: n_gsm: fix missing mux reset on config change at responder
commit 1145169 upstream. 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: 509067b ("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>
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