各位帮忙看一下这个有点问题的驱动程序

复制代码 /********************************************************** * * *说明：本程序为一个基于Linux操作系的简单LED驱动模块， *          本模块主要应用内核定时器进行定时LED，由于 *         比较简单，所以在此不再进行说明 * **环境： *        1)操作系统：Linux *        2)内核版本：kernel-2.6.13 *        3)CPU     ：S3C2440 *        4)开发板  ：Mini2440 * *硬件连接： *        1)：LED1 -- GPB5 *        2)：LED2 -- GPB6 *        3)：LED3 -- GPB7 *        4)：LED4 -- GPB8 * *编译环境:arm-linux-gcc-3.4.1 * *作者：soon *部门：长沙理工大学 计通学院  计算机07级04班 *最后修改时间：2010.5.19 * * **********************************************************/ #ifndef _LED_C_ #define _LED_C_ #include <linux/module.h> #include <linux/kernel.h> #include <linux/fs.h> #include <linux/errno.h> #include <linux/types.h> #include <linux/fcntl.h> #include <linux/cdev.h> #include <linux/version.h> #include <linux/vmalloc.h> #include <linux/ctype.h> #include <linux/pagemap.h> #include <linux/ioctl.h> #include <linux/interrupt.h> #include <linux/time.h> #include <linux/timer.h> #include <asm/io.h> #include <asm/irq.h> #include <asm/signal.h> #include <asm/hardware.h> #include <asm/uaccess.h> #include <asm/arch/regs-gpio.h> #include <asm/arch/regs-timer.h> #include <asm/mach/time.h> #include <asm/hardware/clock.h> #ifndef LED_MAJOR #define LED_MAJOR 240 #endif #ifndef LED_MINOR #define LED_MINOR 0 #endif MODULE_AUTHOR("soon"); MODULE_LICENSE("Dual BSD/GPL"); static unsigned int led_inc=0; static unsigned int led_count = 0; struct LED_dev {     struct cdev cdev;     }; /*定义LED相应的CPU引脚*/ static unsigned long led_table [] = {     S3C2410_GPB5,     S3C2410_GPB6,     S3C2410_GPB7,     S3C2410_GPB8, }; /*相应引脚的工作方式*/ static unsigned int led_cfg_table [] = {     S3C2410_GPB5_OUTP,     S3C2410_GPB6_OUTP,     S3C2410_GPB7_OUTP,     S3C2410_GPB8_OUTP, }; static struct LED_dev *LED_devices; static struct timer_list *LED_TIMER; static void kerneltimer_timerover(unsigned long arg); static void kerneltimer_registertimer(void) {   init_timer(LED_TIMER);     LED_TIMER->expires = get_jiffies_64() + (5 * HZ/100);     LED_TIMER->function = kerneltimer_timerover;     add_timer(LED_TIMER); } static void kerneltimer_timerover(unsigned long arg) {     unsigned int i;          /*如果led_count > 3,则led_count = 0*/     led_count &= 0x3;          for(i = 0; i < led_count; i++)       s3c2410_gpio_setpin(led_table[i],1);          s3c2410_gpio_setpin(led_table[led_count],0);          led_count ++;     kerneltimer_registertimer();      } static int LED_open(struct inode *inode, struct file *filp) {     struct LED_dev *dev;          if(led_inc > 0)return -ERESTARTSYS;              LED_TIMER = kmalloc(sizeof(struct timer_list), GFP_KERNEL);          if(!LED_TIMER)      return -ENOMEM;              kerneltimer_registertimer();          led_inc++;        dev = container_of(inode->i_cdev, struct LED_dev, cdev);     filp->private_data = dev;          return 0; } static int LED_release(struct inode *inode, struct file *filp) {     led_inc--;     return 0; } static struct file_operations LED_fops = {     .owner   =    THIS_MODULE,     .open    =    LED_open,     .release =    LED_release, }; static void LED_cleanup_module(void) {     unsigned int i = 0;         dev_t devno = MKDEV(LED_MAJOR, LED_MINOR);     if (LED_devices) {         cdev_del(&LED_devices->cdev);         kfree(LED_devices);     }          if(LED_TIMER)         kfree(LED_TIMER);     for(; i < 4; i ++)      s3c2410_gpio_setpin(led_table[i], 1);     unregister_chrdev_region(devno,1); } static int LED_init_module(void) {     int result;     unsigned int i;     dev_t dev = 0;     dev = MKDEV(LED_MAJOR,LED_MINOR);     result = register_chrdev_region(dev,1,"Led_Test");          if (result < 0)         return result;          LED_devices = kmalloc(sizeof(struct LED_dev), GFP_KERNEL);          if (!LED_devices){         result = -ENOMEM;         goto fail;     }          memset(LED_devices, 0, sizeof(struct LED_dev));          cdev_init(&LED_devices->cdev, &LED_fops);     LED_devices->cdev.owner = THIS_MODULE;     LED_devices->cdev.ops = &LED_fops;     result = cdev_add (&LED_devices->cdev, dev, 1);     if(result)         goto fail;   for (i = 0; i < 4; i++) {         s3c2410_gpio_cfgpin(led_table[i], led_cfg_table[i]);         s3c2410_gpio_setpin(led_table[i], 1);     }          return 0; fail:     LED_cleanup_module();     return result; } module_init(LED_init_module); module_exit(LED_cleanup_module); #endif /********************************************************** || || || ||                    END || || || **********************************************************/ 如果不方便，可以进行一下调试，MAJOR = 240；MINOR = 0； 驱动加载为： mknod /dev/Led_Test c 240 0

由于程序比较简单，所以没有必要加注释，

这个程序有点问题，也就是注销驱动模块或者运行一段时间后，会死机。小弟不知道是什么原因。