327 	k_mutex_lock(&cmux->transmit_rb_lock, K_FOREVER);  in modem_cmux_transmit_cmd_frame()
331 		k_mutex_unlock(&cmux->transmit_rb_lock);  in modem_cmux_transmit_cmd_frame()
341 	k_mutex_unlock(&cmux->transmit_rb_lock);  in modem_cmux_transmit_cmd_frame()
351 	k_mutex_lock(&cmux->transmit_rb_lock, K_FOREVER);  in modem_cmux_transmit_data_frame()
354 		k_mutex_unlock(&cmux->transmit_rb_lock);  in modem_cmux_transmit_data_frame()
368 		k_mutex_unlock(&cmux->transmit_rb_lock);  in modem_cmux_transmit_data_frame()
374 	k_mutex_unlock(&cmux->transmit_rb_lock);  in modem_cmux_transmit_data_frame()
410 	k_mutex_lock(&cmux->transmit_rb_lock, K_FOREVER);  in modem_cmux_on_fcon_command()
412 	k_mutex_unlock(&cmux->transmit_rb_lock);  in modem_cmux_on_fcon_command()
418 	k_mutex_lock(&cmux->transmit_rb_lock, K_FOREVER);  in modem_cmux_on_fcoff_command()
420 	k_mutex_unlock(&cmux->transmit_rb_lock);  in modem_cmux_on_fcoff_command()
441 	k_mutex_lock(&cmux->transmit_rb_lock, K_FOREVER);  in modem_cmux_on_cld_command()
443 	k_mutex_unlock(&cmux->transmit_rb_lock);  in modem_cmux_on_cld_command()
458 	k_mutex_lock(&cmux->transmit_rb_lock, K_FOREVER);  in modem_cmux_on_control_frame_ua()
460 	k_mutex_unlock(&cmux->transmit_rb_lock);  in modem_cmux_on_control_frame_ua()
537 	k_mutex_lock(&cmux->transmit_rb_lock, K_FOREVER);  in modem_cmux_on_control_frame_sabm()
539 	k_mutex_unlock(&cmux->transmit_rb_lock);  in modem_cmux_on_control_frame_sabm()
944 	k_mutex_lock(&cmux->transmit_rb_lock, K_FOREVER);  in modem_cmux_transmit_handler()
977 	k_mutex_unlock(&cmux->transmit_rb_lock);  in modem_cmux_transmit_handler()
1254 	k_mutex_init(&cmux->transmit_rb_lock);  in modem_cmux_init()