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tty: n_gsm: fix proper link termination after failed open
commite3b7468f08
upstream. Trying to open a DLCI by sending a SABM frame may fail with a timeout. The link is closed on the initiator side without informing the responder about this event. The responder assumes the link is open after sending a UA frame to answer the SABM frame. The link gets stuck in a half open state. This patch fixes this by initiating the proper link termination procedure after link setup timeout instead of silently closing it down. Fixes:e1eaea46bb
("tty: n_gsm line discipline") Cc: stable@vger.kernel.org Signed-off-by: Daniel Starke <daniel.starke@siemens.com> Link: https://lore.kernel.org/r/20220218073123.2121-3-daniel.starke@siemens.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -1502,7 +1502,7 @@ static void gsm_dlci_t1(unsigned long data)
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dlci->mode = DLCI_MODE_ADM;
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gsm_dlci_open(dlci);
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} else {
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gsm_dlci_close(dlci);
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gsm_dlci_begin_close(dlci); /* prevent half open link */
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}
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break;
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