CMUX 内存分配

CMUX部分BUG？

发布于 2020-12-17 11:07:18 浏览：809 订阅该版

```
**
 *  push cmux frame data into slist for different channel virtual serial
 *
 * @param cmux          cmux object
 * @param channel       the number of virtual serial
 * @param frame         the point of frame data
 *
 * @return  RT_EOK      successful
 *          RT_ENOMEM   allocate memory failed
 */
static rt_err_t cmux_frame_push(struct cmux *cmux, int channel, struct cmux_frame *frame)
{
    rt_base_t level;
    struct frame *frame_new = RT_NULL;
    rt_uint16_t frame_len = cmux->vcoms[channel].frame_index;

if (frame_len <= CMUX_MAX_FRAME_LIST_LEN)
    {
        frame_new = rt_malloc(sizeof(struct frame));
        if (frame_new == RT_NULL)
        {
            LOG_E("can't malloc <struct frame> to record data address.");
            return -RT_ENOMEM;
        }
        else
        {
            rt_memset(frame_new, 0, sizeof(struct frame));

frame_new->frame = frame;
            rt_slist_init(&frame_new->frame_list);
        }

level = rt_hw_interrupt_disable();
        rt_slist_append(&cmux->vcoms[channel].flist, &frame_new->frame_list);
        rt_hw_interrupt_enable(level);

LOG_D("new message for channel(%d) is append, Message total: %d.", channel, ++cmux->vcoms[channel].frame_index);

#ifdef CMUX_DEBUG
        LOG_D("CMUX_RX:");
        hex_dump(frame->data, frame->data_length);
#endif
        return RT_EOK;
    }
    LOG_E("malloc failed, the message for channel(%d) is long than CMUX_MAX_FRAME_LIST_LEN(%d).", channel, CMUX_MAX_FRAME_LIST_LEN);
    return -RT_ENOMEM;
}
```
![微信图片_20201217110623.png](/uploads/20201217/d5e32722b2bf057b3a2a2606d6720807.png)