在Linux内核驱动中，构建一个存放如下结构体的队列：struct msg { u16 module_id; u16 cmd_id; u16 cmd_subid; u16 complete; u8 data[128]; };队列结构体如下：struct ring_buffer { int head; int tail; struct msg *data; int size; unsigned int capacity; };请给出操作这个队列的函数，包括初始化，入队，出队，注销等；再构建两个函数，函数一初始化msg结构体，将msg所有成员设置为常数（其中msg的complete成员设置为0），向msg的data数组内放置两个unsigned int 类型数据a和b，之后将msg结构体放入队列中，触发函数二，等待函数二将msg的complete成员设置为1后，获取函数二放入的c并还原成unsigned int 类型；函数二需要从队列中取出msg，并进行解析：判断msg的module_id是否为0x1，如果不是，报错，如果是0x1,使用switch函数解析msg的cmd_id，再根据不同的cmd_id解析cmd_subid，具体解析内容为，取出在函数一向msg的data数组中放入的a和b，还原成unsigned int 类型数据，再将一个unsigned int 类型数据c放到msg的data数组内，之后，再将msg中的complete置1；请在驱动的probe函数中注册这个队列，在remove函数中注销队列，使用移位的方式放置和还原unsigned int类型数据

首先，给出操作队列的函数：

1. 初始化队列

void init_ring_buffer(struct ring_buffer *ring, int size) {
    ring->head = 0;
    ring->tail = 0;
    ring->size = 0;
    ring->capacity = size;
    ring->data = kmalloc(size * sizeof(struct msg), GFP_KERNEL);
}

2. 入队

bool enqueue(struct ring_buffer *ring, struct msg *msg) {
    if (ring->size == ring->capacity) {
        return false;
    }
    memcpy(&ring->data[ring->tail], msg, sizeof(struct msg));
    ring->tail = (ring->tail + 1) % ring->capacity;
    ring->size++;
    return true;
}

3. 出队

bool dequeue(struct ring_buffer *ring, struct msg *msg) {
    if (ring->size == 0) {
        return false;
    }
    memcpy(msg, &ring->data[ring->head], sizeof(struct msg));
    ring->head = (ring->head + 1) % ring->capacity;
    ring->size--;
    return true;
}

4. 注销队列

void destroy_ring_buffer(struct ring_buffer *ring) {
    kfree(ring->data);
    ring->head = 0;
    ring->tail = 0;
    ring->size = 0;
    ring->capacity = 0;
    ring->data = NULL;
}

接下来，给出函数一和函数二的实现：

1. 初始化msg结构体并入队

void init_and_enqueue_msg(struct ring_buffer *ring, unsigned int a, unsigned int b) {
    struct msg msg;
    msg.module_id = 0x1;
    msg.cmd_id = 0x2;
    msg.cmd_subid = 0x3;
    msg.complete = 0;
    *(unsigned int *)(msg.data) = a;
    *(unsigned int *)(msg.data + sizeof(unsigned int)) = b;

    enqueue(ring, &msg);
}

2. 解析msg结构体并修改complete成员

void parse_and_modify_msg(struct ring_buffer *ring) {
    struct msg msg;
    if (!dequeue(ring, &msg)) {
        return;
    }

    if (msg.module_id != 0x1) {
        printk(KERN_ERR "invalid module id\n");
        return;
    }

    switch (msg.cmd_id) {
    case 0x2:
        switch (msg.cmd_subid) {
        case 0x3:
            unsigned int a = *(unsigned int *)(msg.data);
            unsigned int b = *(unsigned int *)(msg.data + sizeof(unsigned int));
            unsigned int c = (a << 16) | b;
            *(unsigned int *)(msg.data) = c;
            msg.complete = 1;
            enqueue(ring, &msg);
            break;
        default:
            printk(KERN_ERR "invalid cmd subid\n");
            break;
        }
        break;
    default:
        printk(KERN_ERR "invalid cmd id\n");
        break;
    }
}

最后，在probe函数中注册队列，在remove函数中注销队列：

static struct ring_buffer *ring;

static int __init my_driver_probe(struct platform_device *pdev) {
    ring = kmalloc(sizeof(struct ring_buffer), GFP_KERNEL);
    if (!ring) {
        return -ENOMEM;
    }
    init_ring_buffer(ring, 10);
    return 0;
}

static int __exit my_driver_remove(struct platform_device *pdev) {
    destroy_ring_buffer(ring);
    kfree(ring);
    return 0;
}

static struct platform_driver my_driver = {
    .probe = my_driver_probe,
    .remove = my_driver_remove,
    .driver = {
        .name = "my_driver",
    },
};

module_platform_driver(my_driver);