struct ring_buffer { int head; int tail; struct msg *data; int size; unsigned int capacity; }; struct msg { u16 module_id; u16 cmd_id; u16 cmd_subid; u16 complete; u8 data[128]; };struct pokemon_uart_port { struct uart_port port; struct clk *clk; const struct vendor_data *vendor; unsigned int im; /* interrupt mask */ unsigned int old_status; unsigned int fifosize; unsigned int old_cr; /* state during shutdown */ unsigned int fixed_baud; struct ring_buffer *tx_buf; struct ring_buffer *rx_buf; char type[12]; };struct ring_buffer* ring_buffer_init(unsigned int capacity) { struct ring_buffer* rbuf=kmalloc(sizeof(struct ring_buffer),GFP_KERNEL); rbuf->capacity=capacity; rbuf->head = rbuf->size=0; rbuf->tail = capacity - 1; rbuf->data = kmalloc(rbuf->capacity * sizeof(struct msg), GFP_KERNEL); printk(KERN_DEBUG "ring_buffer create successfully!/n"); return rbuf; }static int pokemon_uart_probe(struct amba_device *dev, const struct amba_id *id) { struct pokemon_uart_port *pup; struct vendor_data *vendor = id->data; int portnr, ret; portnr = pokemon_find_free_port(); if (portnr < 0) return portnr; pup = devm_kzalloc(&dev->dev, sizeof(struct pokemon_uart_port), GFP_KERNEL); if(!pup) return -ENOMEM; pup->clk = devm_clk_get(&dev->dev, NULL); if(IS_ERR(pup->clk)) return PTR_ERR(pup->clk); pup->port.irq = dev->irq[0]; pup->port.line = portnr; pup->vendor = vendor; pup->fifosize = 32; pup->port.iotype = pup->vendor->access_32b ? UPIO_MEM32 : UPIO_MEM; pup->port.ops = &pokemon_uart_ops; snprintf(pup->type, sizeof(pup->type), "PL011 rev%u", amba_rev(dev)); pup->tx_buf = ring_buffer_init(10); pup->rx_buf = ring_buffer_init(10); ret = pokemon_setup_port(&dev->dev, pup, &dev->res, portnr); if (ret) return ret; amba_set_drvdata(dev, pup); return pokemon_register_port(pup); }检查一下这段linux内核驱动代码中,有无代码逻辑和格式错误,如果有,请给出详细修改建议
时间: 2024-04-25 19:26:30 浏览: 115
以下是我发现的代码逻辑和格式错误:
1. 在函数 `ring_buffer_init()` 中,`/n` 应该改为 `\n`。
2. 在函数 `pokemon_uart_probe()` 中,`if(IS_ERR(pup->clk))` 应该改为 `if (IS_ERR(pup->clk))`。
以下是修改建议:
1. 在函数 `ring_buffer_init()` 中,应该在申请内存之后检查是否成功,如果失败应该释放已经申请的内存。
2. 在函数 `pokemon_uart_probe()` 中,应该在 `devm_kzalloc()` 之后检查是否成功,如果失败应该返回错误码。
3. 在函数 `pokemon_uart_probe()` 中,应该在调用 `pokemon_setup_port()` 之后检查返回值,如果失败应该返回错误码。
4. 在函数 `pokemon_uart_probe()` 中,应该在调用 `amba_set_drvdata()` 之前检查 `pup` 是否为 NULL,如果为 NULL 应该返回错误码。
5. 在函数 `pokemon_uart_probe()` 中,应该在调用 `pokemon_register_port()` 之后检查返回值,如果失败应该返回错误码。
6. 在函数 `pokemon_uart_probe()` 中,可以考虑在 `snprintf()` 之前检查 `sizeof(pup->type)` 是否足够大。
相关问题
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; };
好的,你的问题是如何在Linux内核驱动中构建一个存放 `struct msg` 结构体的队列,队列结构体定义如下:
```c
struct ring_buffer {
int head;
int tail;
struct msg *data;
int size;
unsigned int capacity;
};
```
在驱动中,可以使用循环队列来实现这个结构体。循环队列是一种环形缓冲区,可以在队列的两端添加和删除元素。队列的头和尾指针可以通过取模运算循环使用缓冲区的空间。
首先,需要在驱动中定义一个 `struct ring_buffer` 类型的变量,例如:
```c
struct ring_buffer msg_queue;
```
然后,可以在驱动初始化的时候分配队列所需的内存空间,并将队列头和尾指针、队列容量等参数初始化:
```c
msg_queue.head = 0;
msg_queue.tail = 0;
msg_queue.size = 0;
msg_queue.capacity = QUEUE_CAPACITY;
msg_queue.data = kmalloc(sizeof(struct msg) * QUEUE_CAPACITY, GFP_KERNEL);
if (!msg_queue.data) {
printk(KERN_ERR "Failed to allocate memory for message queue\n");
return -ENOMEM;
}
```
其中 `QUEUE_CAPACITY` 是队列的容量,可以根据实际情况设置。
接下来,可以定义一些函数来实现队列的基本操作,例如入队、出队、查看队列头等。下面是一个简单的入队函数示例:
```c
void queue_push(struct ring_buffer *queue, struct msg *msg_ptr)
{
if (queue->size == queue->capacity) {
printk(KERN_WARNING "Message queue is full\n");
return;
}
queue->data[queue->tail] = *msg_ptr;
queue->tail = (queue->tail + 1) % queue->capacity;
queue->size++;
}
```
这个函数首先检查队列是否已满,如果已满则输出警告并返回。否则,将传入的 `msg_ptr` 指向的结构体复制到队列的尾部,并更新队列的尾指针和大小。
出队函数的实现类似,只需要从队列头取出消息并返回即可。
注意,在使用队列时需要考虑队列头指针和尾指针的循环使用,以及队列空间的限制。同时,由于队列存储的是结构体指针,需要注意内存的分配和释放问题。
struct ring_buffer { int head; int tail; struct msg data; int size; unsigned int capacity; };struct ring_buffer ring_buffer_init(unsigned int capacity) { struct ring_buffer* rbuf=kmalloc(sizeof(struct ring_buffer),GFP_KERNEL); rbuf->capacity=capacity; rbuf->head = rbuf->size=0; rbuf->tail = capacity - 1; rbuf->data = kmalloc(rbuf->capacity * sizeof(struct msg), GFP_KERNEL); printk(KERN_DEBUG "ring_buffer create successfully!/n"); return rbuf; } int ring_buffer_is_empty(struct ring_buffer* rbuf){ return (rbuf->size == 0); } int ring_buffer_is_full(struct ring_buffer* rbuf) { return (rbuf->size == rbuf->capacity); } void ring_buffer_in(struct ring_buffer* rbuf, struct msg msg) { if(ring_buffer_is_full(rbuf)){ return; } rbuf->tail = (rbuf->tail + 1) % rbuf->capacity; rbuf->data[rbuf->tail] = msg; rbuf->size = rbuf->size + 1; } struct msg ring_buffer_out(struct ring_buffer* rbuf) { struct msg rsv_msg; if(ring_buffer_is_empty(rbuf)) { pr_info("buffer is empty!\n"); rsv_msg.complete=-1; return rsv_msg; } rsv_msg=rbuf->data[rbuf->head]; rbuf->head=(rbuf->head+1) % rbuf->capacity; rbuf->size = rbuf->size - 1; return rsv_msg; } void destroy_ring_buffer(struct ring_buffer* rbuf){ kfree(rbuf->data); kfree(rbuf); }以上代码是我写的关于操作环形队列的函数,请检查这些函数有无代码上的编译和格式错误,修改后,在一个Linux内核驱动内调用这些函数,完成队列操作,给出详细代码
以下是完整的队列操作代码,包括驱动的初始化和退出函数:
```
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/slab.h>
struct msg {
int data;
int complete;
};
struct ring_buffer {
int head;
int tail;
struct msg *data;
int size;
unsigned int capacity;
};
struct ring_buffer *ring_buffer_init(unsigned int capacity) {
struct ring_buffer *rbuf = kmalloc(sizeof(struct ring_buffer), GFP_KERNEL);
rbuf->capacity = capacity;
rbuf->head = rbuf->size = 0;
rbuf->tail = capacity - 1;
rbuf->data = kmalloc(rbuf->capacity * sizeof(struct msg), GFP_KERNEL);
printk(KERN_DEBUG "ring_buffer create successfully!\n");
return rbuf;
}
int ring_buffer_is_empty(struct ring_buffer *rbuf) {
return (rbuf->size == 0);
}
int ring_buffer_is_full(struct ring_buffer *rbuf) {
return (rbuf->size == rbuf->capacity);
}
void ring_buffer_in(struct ring_buffer *rbuf, struct msg msg) {
if (ring_buffer_is_full(rbuf)) {
return;
}
rbuf->tail = (rbuf->tail + 1) % rbuf->capacity;
rbuf->data[rbuf->tail] = msg;
rbuf->size = rbuf->size + 1;
}
struct msg ring_buffer_out(struct ring_buffer *rbuf) {
struct msg rsv_msg;
if (ring_buffer_is_empty(rbuf)) {
pr_info("buffer is empty!\n");
rsv_msg.complete = -1;
return rsv_msg;
}
rsv_msg = rbuf->data[rbuf->head];
rbuf->head = (rbuf->head + 1) % rbuf->capacity;
rbuf->size = rbuf->size - 1;
return rsv_msg;
}
void destroy_ring_buffer(struct ring_buffer *rbuf) {
kfree(rbuf->data);
kfree(rbuf);
}
static int __init my_driver_init(void) {
struct ring_buffer *rbuf = ring_buffer_init(10);
struct msg msg1 = {1, 0};
struct msg msg2 = {2, 0};
struct msg msg3 = {3, 0};
ring_buffer_in(rbuf, msg1);
ring_buffer_in(rbuf, msg2);
ring_buffer_in(rbuf, msg3);
struct msg out1 = ring_buffer_out(rbuf);
struct msg out2 = ring_buffer_out(rbuf);
struct msg out3 = ring_buffer_out(rbuf);
printk(KERN_DEBUG "out1: %d, out2: %d, out3: %d\n", out1.data, out2.data, out3.data);
destroy_ring_buffer(rbuf);
return 0;
}
static void __exit my_driver_exit(void) {
printk(KERN_DEBUG "my_driver exit\n");
}
module_init(my_driver_init);
module_exit(my_driver_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Your Name");
MODULE_DESCRIPTION("A simple example Linux module.");
MODULE_VERSION("0.01");
```
上面的代码在驱动初始化函数中创建了一个容量为 10 的环形队列,然后向队列中插入了三个元素,接着连续地从队列中取出三个元素并打印,最后在驱动退出函数中销毁了队列。
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