diff options
| author | Zhenguo Zhao <Zhenguo.Zhao1@unisoc.com> | 2021-08-20 20:17:47 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-09-14 10:50:27 +0200 |
| commit | cc0f42122a7e7a5ede9c5f2a41199128b8449eda (patch) | |
| tree | 0eee023acbd9181136490acec62eb7d115a3a7d8 /drivers/tty/n_gsm.c | |
| parent | cd936621379d513bd768319219840b003a45e729 (diff) | |
tty: n_gsm: Modify CR,PF bit when config requester
When n_gsm config "initiator=0",as requester,gsmld receives dlci SABM/DISC
control command frame,but send UA frame is error.
Example:
Gsmld receive dlc0 SABM frame "f9 03 3f 01 1c f9",now it sends UA
frame "f9 01 63 01 a3 f9",CR and PF bit are 0,but it should be set
1 from requster to initiator.
Kernel test log as follows:
Before modify
[ 271.732031] c1 gsmld_receive: 00000000: f9 03 3f 01 1c f9
[ 271.741719] c1 <-- 0) C: SABM(P)
[ 271.749483] c1 gsmld_output: 00000000: f9 01 63 01 a3 f9
[ 271.758337] c1 --> 0) R: UA(F)
After modify
[ 261.233188] c0 gsmld_receive: 00000000: f9 03 3f 01 1c f9
[ 261.242767] c0 <-- 0) C: SABM(P)
[ 261.250497] c0 gsmld_output: 00000000: f9 03 73 01 d7 f9
[ 261.259759] c0 --> 0) C: UA(P)
Signed-off-by: Zhenguo Zhao <Zhenguo.Zhao1@unisoc.com>
Link: https://lore.kernel.org/r/1629461872-26965-3-git-send-email-zhenguo6858@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/n_gsm.c')
| -rw-r--r-- | drivers/tty/n_gsm.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/drivers/tty/n_gsm.c b/drivers/tty/n_gsm.c index 25ba5e669fb9..3ba0391e2a5e 100644 --- a/drivers/tty/n_gsm.c +++ b/drivers/tty/n_gsm.c @@ -601,7 +601,7 @@ static void gsm_send(struct gsm_mux *gsm, int addr, int cr, int control) static inline void gsm_response(struct gsm_mux *gsm, int addr, int control) { - gsm_send(gsm, addr, 0, control); + gsm_send(gsm, addr, 1, control); } /** @@ -1786,9 +1786,9 @@ static void gsm_queue(struct gsm_mux *gsm) if (dlci == NULL) return; if (dlci->dead) - gsm_response(gsm, address, DM); + gsm_response(gsm, address, DM|PF); else { - gsm_response(gsm, address, UA); + gsm_response(gsm, address, UA|PF); gsm_dlci_open(dlci); } break; @@ -1796,11 +1796,11 @@ static void gsm_queue(struct gsm_mux *gsm) if (cr == 1) goto invalid; if (dlci == NULL || dlci->state == DLCI_CLOSED) { - gsm_response(gsm, address, DM); + gsm_response(gsm, address, DM|PF); return; } /* Real close complete */ - gsm_response(gsm, address, UA); + gsm_response(gsm, address, UA|PF); gsm_dlci_close(dlci); break; case UA: |