insmod错误

createwindow 发表于 2011-05-10 13:26

本帖最后由 createwindow 于 2011-05-12 09:30 编辑

以下为代码#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/fs.h>
#include <linux/cdev.h>
#include <linux/device.h>

MODULE_LICENSE ("GPL");

int hello_major = 120;
int hello_minor = 0;
int number_of_devices = 1;

struct cdev cdev;
static dev_t dev;

struct file_operations hello_fops = {
   .owner = THIS_MODULE
};

static void char_reg_setup_cdev (void)
{
int error;
cdev_init (&cdev, &hello_fops);
cdev.owner = THIS_MODULE;
cdev.ops = &hello_fops;
error = cdev_add (&cdev, dev, 1);
if (error)
   printk (KERN_NOTICE "Error %d adding char_reg_setup_cdev", error);

}

struct class *my_class;

static int __init hello_2_init (void)
{
int result;
dev = MKDEV(hello_minor, hello_minor);
result = register_chrdev_region (dev, number_of_devices, "hello");
if (result<0) {
   printk (KERN_WARNING "hello: can't get major number %d\n", hello_major);
   return result;
}

char_reg_setup_cdev ();

/* create your own class under /sysfs */
my_class = class_create(THIS_MODULE, "my_class");
if(IS_ERR(my_class))
{
   printk("Err: failed in creating class.\n");
   return -1;
}

/* register your own device in sysfs, and this will cause udev to create corresponding device node */
device_create( my_class, NULL, dev, "hello%d", 0 );

printk (KERN_INFO "Registered character driver\n");
return 0;
}

static void __exit hello_2_exit (void)
{
cdev_del (&cdev);
device_destroy(my_class, dev);
class_destroy(my_class);
unregister_chrdev_region (dev, number_of_devices);

printk (KERN_INFO "char driver cleaned up\n");
}

module_init (hello_2_init);
module_exit (hello_2_exit);成功编译后，insmod hello.ko,只提示"killed".
若再次insmod hello.ko则会提示insmod error inserting 'hello.ko ':-1 file exists。运行lsmod |grep hello，显示
hello                28491
如果rmmod hello.ko，则提示ERROR: Module hello is in use

内核版本为2.6.38.2

请大家指教。

createwindow 发表于 2011-05-12 07:51

有人帮忙吗:dizzy:

dreamice 发表于 2011-05-12 12:55

写个简单的调试一下吧，一个helloworld写这么多

Trigger_Huang 发表于 2011-05-12 18:45

建议先手动创建设备节点，OK后再自动创建，step by step。
建议用动态的方式分配dev_t
建议注意一些常用的内核编程习惯

createwindow 发表于 2011-05-12 22:17

回复 3# dreamice

试过简单的了，下面是改过的版本。问题依旧。但是删除device_create()后，结果是正常的。非常奇怪#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/fs.h>
#include <linux/cdev.h>
#include <linux/slab.h>
#include <linux/device.h>

MODULE_LICENSE ("GPL");

static struct cdev ctest;
static dev_t devno;

struct file_operations hello_fops = {
.owner = THIS_MODULE,
};

struct class *my_class;

int __init heiman_init (void)
{
int error;

if (alloc_chrdev_region(&devno, 0, 1, "heiman") < 0) {
printk(KERN_DEBUG "CAN'T register a device\n");
return -1;
}

my_class = class_create(THIS_MODULE, "heiman");
cdev_init (&ctest, &hello_fops);
ctest.owner = THIS_MODULE;
error = cdev_add (&ctest, devno, 1);
device_create( my_class, NULL, devno, "heiman%d", 0);

printk (KERN_INFO "Registered character driver\n");
return 0;
}

static void __exit heiman_exit (void)
{
unregister_chrdev_region(devno, 1);
device_destroy(my_class, devno);
cdev_del(&ctest);
class_destroy(my_class);

printk (KERN_INFO "char driver cleaned up\n");
return;
}

module_init(heiman_init);
module_exit(heiman_exit);

spray428 发表于 2011-06-02 17:56

device_create( my_class, NULL, dev, "hello%d", 0 );用错拉！
改成device_create( my_class, NULL, MKDEV(hello_major, 0), NULL ,"hello%d", 0);就可以了，你那个代码是从网上抄来的吧！

/**
* device_create - creates a device and registers it with sysfs
* @class: pointer to the struct class that this device should be registered to
* @parent: pointer to the parent struct device of this new device, if any
* @devt: the dev_t for the char device to be added
* @drvdata: the data to be added to the device for callbacks
* @fmt: string for the device's name
*
* This function can be used by char device classes.A struct device
* will be created in sysfs, registered to the specified class.
*
* A "dev" file will be created, showing the dev_t for the device, if
* the dev_t is not 0,0.
* If a pointer to a parent struct device is passed in, the newly created
* struct device will be a child of that device in sysfs.
* The pointer to the struct device will be returned from the call.
* Any further sysfs files that might be required can be created using this
* pointer.
*
* Returns &struct device pointer on success, or ERR_PTR() on error.
*
* Note: the struct class passed to this function must have previously
* been created with a call to class_create().
*/
struct device *device_create(struct class *class, struct device *parent,
dev_t devt, void *drvdata, const char *fmt, ...)
{
va_list vargs;
struct device *dev;

va_start(vargs, fmt);
dev = device_create_vargs(class, parent, devt, drvdata, fmt, vargs);
va_end(vargs);
return dev;
}
EXPORT_SYMBOL_GPL(device_create);

windman521 发表于 2011-06-02 22:47

实不相瞒，是你的device_create缺少一个参数。
device_create( my_class, NULL, devno, “hello0", "heiman%d", 0);

bin_linux96 发表于 2011-06-07 19:21

重启电脑就可以解决了。哈哈，

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insmod错误