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tty: n_gsm: fix wrong T1 retry count handling

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[ Upstream commit f30e10caa80aa1f35508bc17fc302dbbde9a833c ]

n_gsm is based on the 3GPP 07.010 and its newer version is the 3GPP 27.010.
See https://portal.3gpp.org/desktopmodules/Specifications/SpecificationDetails.aspx?specificationId=1516
The changes from 07.010 to 27.010 are non-functional. Therefore, I refer to
the newer 27.010 here. Chapter 5.7.3 states that the valid range for the
maximum number of retransmissions (N2) is from 0 to 255 (both including).
gsm_dlci_t1() handles this number incorrectly by performing N2 - 1
retransmission attempts. Setting N2 to zero results in more than 255
retransmission attempts.
Fix gsm_dlci_t1() to comply with 3GPP 27.010.

Fixes: e1eaea46bb40 ("tty: n_gsm line discipline")
Signed-off-by: Daniel Starke <daniel.starke@siemens.com>
Link: https://lore.kernel.org/r/20220707113223.3685-1-daniel.starke@siemens.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Daniel Starke 2022-07-07 13:32:20 +02:00 committed by Greg Kroah-Hartman
parent 3aaa98e7b5
commit 8b2af39c72
1 changed files with 2 additions and 2 deletions
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4
drivers/tty/n_gsm.c
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@ -1546,8 +1546,8 @@ static void gsm_dlci_t1(unsigned long data)
switch (dlci->state) {
case DLCI_OPENING:
dlci->retries--;
if (dlci->retries) {
dlci->retries--;
gsm_command(dlci->gsm, dlci->addr, SABM|PF);
mod_timer(&dlci->t1, jiffies + gsm->t1 * HZ / 100);
} else if (!dlci->addr && gsm->control == (DM | PF)) {
@ -1562,8 +1562,8 @@ static void gsm_dlci_t1(unsigned long data)
break;
case DLCI_CLOSING:
dlci->retries--;
if (dlci->retries) {
dlci->retries--;
gsm_command(dlci->gsm, dlci->addr, DISC|PF);
mod_timer(&dlci->t1, jiffies + gsm->t1 * HZ / 100);
} else