linux-kernel - [PATCH v2] tty: n_gsm: CR bit value should be 0 when config "initiator=0"

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Date:   Wed, 16 Jun 2021 19:53:22 +0800
From:   Zhenguo Zhao <zhenguo6858@...il.com>
To:     zhenguo6858@...il.com, gregkh@...uxfoundation.org,
        jirislaby@...nel.org
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH v2] tty: n_gsm: CR bit value should be 0 when config "initiator=0"

From: Zhenguo Zhao <zhenguo.zhao1@...soc.com>

config "initiator=0",gsmld will receives dlci SABM/DISC control command
frame,as slaver,the CR bit value check should be 1.

if check "cr == 0",it will goto invalid,so it can't send UA response
frame and open slaver dlci.

Signed-off-by: Zhenguo Zhao <zhenguo.zhao1@...soc.com>
---
 drivers/tty/n_gsm.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/tty/n_gsm.c b/drivers/tty/n_gsm.c
index 5fea02c..becca2c 100644
--- a/drivers/tty/n_gsm.c
+++ b/drivers/tty/n_gsm.c
@@ -1779,7 +1779,7 @@ static void gsm_queue(struct gsm_mux *gsm)
 
 	switch (gsm->control) {
 	case SABM|PF:
-		if (cr == 0)
+		if (cr == 1)
 			goto invalid;
 		if (dlci == NULL)
 			dlci = gsm_dlci_alloc(gsm, address);
@@ -1793,7 +1793,7 @@ static void gsm_queue(struct gsm_mux *gsm)
 		}
 		break;
 	case DISC|PF:
-		if (cr == 0)
+		if (cr == 1)
 			goto invalid;
 		if (dlci == NULL || dlci->state == DLCI_CLOSED) {
 			gsm_response(gsm, address, DM);
-- 
1.9.1