From: Eric Bénard Date: Wed, 9 Mar 2011 18:24:49 +0000 (+0100) Subject: n_gsm: fix UIH control byte : P bit should be 0 X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=ed43b47b29bce303f86e1bff69b6f9924f5afcc4;p=GitHub%2FLineageOS%2Fandroid_kernel_samsung_universal7580.git n_gsm: fix UIH control byte : P bit should be 0 * the GSM 07.10 specification says in 5.4.3.1 that 'both stations shall set the P bit to 0' thanks to Alan Cox for finding this explanation in the spec * without this fix, on Telit & Sim.com modems, opening a new DLC randomly fails. Not setting PF bit of the control byte gives a reliable behaviour on these modems. Signed-off-by: Eric Bénard Cc: Alan Cox Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/tty/n_gsm.c b/drivers/tty/n_gsm.c index 0d90be48463..176f63256b3 100644 --- a/drivers/tty/n_gsm.c +++ b/drivers/tty/n_gsm.c @@ -1250,8 +1250,7 @@ static void gsm_control_response(struct gsm_mux *gsm, unsigned int command, static void gsm_control_transmit(struct gsm_mux *gsm, struct gsm_control *ctrl) { - struct gsm_msg *msg = gsm_data_alloc(gsm, 0, ctrl->len + 1, - gsm->ftype|PF); + struct gsm_msg *msg = gsm_data_alloc(gsm, 0, ctrl->len + 1, gsm->ftype); if (msg == NULL) return; msg->data[0] = (ctrl->cmd << 1) | 2 | EA; /* command */