[问答]

驱动错误。。求解

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问答对人有帮助，内容完整，我也想知道答案 0 自己按照韦东山视频的 led灯驱动第一次加载正常卸载时提示如下 [root@FriendlyARM /first_drv]# rmmod first_drv Unable to handle kernel NULL pointer dereference at virtual address 00000000 pgd = c3abc000 [00000000] pgd=33a39031, pte=00000000, *ppte=00000000 Internal error: Oops: 17 [#1] last sysfs file: /sys/devices/virtual/firstdrv_leds/firstdrv_leds/dev Modules linked in: [last unloaded: first_drv] CPU: 0 Not tainted (2.6.32.2-FriendlyARM #1) PC is at remove_vm_area+0x78/0xac LR is at __vunmap+0x2c/0x10c pc : [] lr : [] psr: a0000013 sp : c3a89ed0 ip : c3a63f40 fp : c3a89ee4 r10: 00000000 r9 : c3a88000 r8 : beadff62 r7 : 00000001 r6 : bf000000 r5 : bf000894 r4 : c3948b20 r3 : 00000000 r2 : 00000000 r1 : bf000000 r0 : bf000000 Flags: NzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: c000717f Table: 33abc000 DAC: 00000015 Process rmmod (pid: 719, stack limit = 0xc3a88270) Stack: (0xc3a89ed0 to 0xc3a8a000) 9ec0: 00000000 bf000894 c3a89f04 c3a89ee8 9ee0: c0092a60 c00915dc bf00084c bf000894 c3a88000 c3a89f44 c3a89f14 c3a89f08 9f00: c0092bbc c0092a44 c3a89f24 c3a89f18 c0034ec4 c0092b98 c3a89f3c c3a89f28 9f20: c006e0a0 c0034ec0 00000000 bf00084c c3a89fa4 c3a89f40 c006e25c c006dfc0 9f40: c008d3e4 73726966 72645f74 c3a90076 00000000 00001000 4001f000 c0030088 9f60: c3a88000 00000000 c3a89f84 c3a89f78 c0060f28 c014a150 c3a89fa4 00a89f88 9f80: c008d484 beadff62 00000001 00000000 00000081 c0030088 00000000 c3a89fa8 9fa0: c002fee0 c006e0d0 beadff62 00000001 beadff62 00000880 4022a024 00000000 9fc0: beadff62 00000001 00000000 00000081 00000001 00000000 beadfe88 00000000 9fe0: 00000000 beadfb10 00018250 401c886c 60000010 beadff62 00000000 00000000 Backtrace: [] (remove_vm_area+0x0/0xac) from [] (__vunmap+0x2c/0x10c) r5:bf000894 r4:00000000 [] (__vunmap+0x0/0x10c) from [] (vfree+0x34/0x4c) r7:c3a89f44 r6:c3a88000 r5:bf000894 r4:bf00084c [] (vfree+0x0/0x4c) from [] (module_free+0x14/0x18) [] (module_free+0x0/0x18) from [] (free_module+0xf0/0x110) [] (free_module+0x0/0x110) from [] (sys_delete_module+0x19c/0x208) r5:bf00084c r4:00000000 [] (sys_delete_module+0x0/0x208) from [] (ret_fast_syscall+0x0/0x28) r8:c0030088 r7:00000081 r6:00000000 r5:00000001 r4:beadff62 Code: e1540002 059f3034 0a000003 e1a03002 (e5922000) ---[ end trace d708ca1bf775c8f6 ]--- Segmentation fault 再次加载时 linux就没反应了 0
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答案对人有帮助，有参考价值 0 驱动源代码： #include #include #include #include #include #include #include #include #include #include #include #include #define DEVICE_NAME "firstdrv_leds" /* 加载模式后，执行”cat /proc/devices”命令看到的设备名称 / #define LED_MAJOR 231 / 主设备号 / static struct class firstdrv_class; static struct device firstdrv_class_devs[5]; / bit0<=>D10, 0:亮, 1:灭 * bit1<=>D11, 0:亮, 1:灭 * bit2<=>D12, 0:亮, 1:灭 / static char leds_status = 0x0; static DECLARE_MUTEX(leds_lock); // 定义赋值 //static int minor; static unsigned long gpio_va; #define GPIO_OFT(x) ((x) - 0x56000000) #define GPBCON ((volatile unsigned long )(gpio_va + GPIO_OFT(0x56000010))) #define GPBDAT ((volatile unsigned long )(gpio_va + GPIO_OFT(0x56000014))) static int first_drv_open(struct inode inode, struct file file) { int minor = MINOR(inode->i_rdev); //MINOR(inode->i_cdev); switch(minor) { case 0: / /dev/leds / { // 配置引脚为输出 //s3c2410_gpio_cfgpin(S3C2410_GPB(5), S3C2410_GPB(5)_OUTP); //s3c2410_gpio_cfgpin(S3C2410_GPB(6), S3C2410_GPB(6)_OUTP); //s3c2410_gpio_cfgpin(S3C2410_GPB(7), S3C2410_GPB(7)_OUTP); //s3c2410_gpio_cfgpin(S3C2410_GPB(8), S3C2410_GPB(8)_OUTP); GPBCON &= ~(0x3<<(52)); GPBCON \|= (1<<(52)); GPBCON &= ~(0x3<<(62)); GPBCON \|= (1<<(62)); GPBCON &= ~(0x3<<(72)); GPBCON \|= (1<<(72)); GPBCON &= ~(0x3<<(82)); GPBCON \|= (1<<(82)); // 都输出0 //s3c2410_gpio_setpin(S3C2410_GPB(5), 0); //s3c2410_gpio_setpin(S3C2410_GPB(6), 0); //s3c2410_gpio_setpin(S3C2410_GPB(7), 0); //s3c2410_gpio_setpin(S3C2410_GPB(8), 0); GPBDAT &= ~(1<<5); GPBDAT &= ~(1<<6); GPBDAT &= ~(1<<7); GPBDAT &= ~(1<<8); down(&leds_lock); leds_status = 0x0; up(&leds_lock); break; } case 1: / /dev/led1 / { s3c2410_gpio_cfgpin(S3C2410_GPB(5), S3C2410_GPIO_OUTPUT); s3c2410_gpio_setpin(S3C2410_GPB(5), 0); down(&leds_lock); leds_status &= ~(1<<0); up(&leds_lock); break; } case 2: / /dev/led2 / { s3c2410_gpio_cfgpin(S3C2410_GPB(6), S3C2410_GPIO_OUTPUT); s3c2410_gpio_setpin(S3C2410_GPB(6), 0); down(&leds_lock); leds_status &= ~(1<<1); up(&leds_lock); break; } case 3: / /dev/led3 / { s3c2410_gpio_cfgpin(S3C2410_GPB(7), S3C2410_GPIO_OUTPUT); s3c2410_gpio_setpin(S3C2410_GPB(7), 0); down(&leds_lock); leds_status &= ~(1<<2); up(&leds_lock); break; } case 4: / /dev/led4 / { s3c2410_gpio_cfgpin(S3C2410_GPB(8), S3C2410_GPIO_OUTPUT); s3c2410_gpio_setpin(S3C2410_GPB(8), 0); down(&leds_lock); leds_status &= ~(1<<3); up(&leds_lock); break; } } return 0; } static int first_drv_read(struct file filp, char __user buff, size_t count, loff_t offp) { int minor = MINOR(filp->f_dentry->d_inode->i_rdev); char val; switch (minor) { case 0: /* /dev/leds / { copy_to_user(buff, (const void )&leds_status, 1); break; } case 1: /* /dev/led1 / { down(&leds_lock); val = leds_status & 0x1; up(&leds_lock); copy_to_user(buff, (const void )&val, 1); break; } case 2: /* /dev/led2 / { down(&leds_lock); val = (leds_status>>1) & 0x1; up(&leds_lock); copy_to_user(buff, (const void )&val, 1); break; } case 3: /* /dev/led3 / { down(&leds_lock); val = (leds_status>>2) & 0x1; up(&leds_lock); copy_to_user(buff, (const void )&val, 1); break; } case 4: /* /dev/led4 / { down(&leds_lock); val = (leds_status>>3) & 0x1; up(&leds_lock); copy_to_user(buff, (const void )&val, 1); break; } } return 1; } static int first_drv_write(struct file file, const char __user buf, size_t count, loff_t * ppos) { int minor = MINOR( file ->f_dentry->d_inode->i_rdev); char val; copy_from_user(&val, buf, 1); switch (minor) { case 0: /* /dev/leds / { s3c2410_gpio_setpin(S3C2410_GPB(5), (val & 0x1)); s3c2410_gpio_setpin(S3C2410_GPB(6), (val & 0x1)); s3c2410_gpio_setpin(S3C2410_GPB(7), (val & 0x1)); s3c2410_gpio_setpin(S3C2410_GPB(8), (val & 0x1)); down(&leds_lock); leds_status = val; up(&leds_lock); break; } case 1: / /dev/led1 / { s3c2410_gpio_setpin(S3C2410_GPB(5), val); if (val == 0) { down(&leds_lock); leds_status &= ~(1<<0); up(&leds_lock); } else { down(&leds_lock); leds_status \|= (1<<0); up(&leds_lock); } break; } case 2: / /dev/led2 / { s3c2410_gpio_setpin(S3C2410_GPB(6), val); if (val == 0) { down(&leds_lock); leds_status &= ~(1<<1); up(&leds_lock); } else { down(&leds_lock); leds_status \|= (1<<1); up(&leds_lock); } break; } case 3: / /dev/led3 / { s3c2410_gpio_setpin(S3C2410_GPB(7), val); if (val == 0) { down(&leds_lock); leds_status &= ~(1<<2); up(&leds_lock); } else { down(&leds_lock); leds_status \|= (1<<2); up(&leds_lock); } break; } case 4: / /dev/led4 */ { s3c2410_gpio_setpin(S3C2410_GPB(8), val); if (val == 0) { down(&leds_lock); leds_status &= ~(1<<3); up(&leds_lock); } else { down(&leds_lock); leds_status \|= (1<<3); up(&leds_lock); } break; } } return 1; } static struct file_operations first_drv_fops = { .owner = THIS_MODULE, .open = first_drv_open, .read = first_drv_read, .write = first_drv_write, }; int first_drv_init(void) { int ret; int minor = 0; gpio_va = ioremap(0x56000000, 0x100000); if (!gpio_va) { return -EIO; } ret = register_chrdev(LED_MAJOR, DEVICE_NAME, &first_drv_fops); if (ret < 0) { printk(DEVICE_NAME " can't register major numbern"); return ret; } firstdrv_class = class_create(THIS_MODULE, "firstdrv_leds"); if (IS_ERR(firstdrv_class)) return PTR_ERR(firstdrv_class); firstdrv_class_devs[0] = device_create(firstdrv_class, NULL, MKDEV(LED_MAJOR, 0), NULL, "firstdrv_leds"); for (minor = 1; minor < 5; minor++) { firstdrv_class_devs[minor] = device_create(firstdrv_class, NULL, MKDEV(LED_MAJOR, minor), NULL, "firstdrv_led%d", minor); if (unlikely(IS_ERR(firstdrv_class_devs[minor]))) return PTR_ERR(firstdrv_class_devs[minor]); } printk(DEVICE_NAME " initializedn"); return 0; } void first_drv_exit(void) { int minor; unregister_chrdev(LED_MAJOR, DEVICE_NAME); for (minor = 0; minor < 5; minor++) { device_unregister(firstdrv_class_devs[minor]); } class_destroy(firstdrv_class); iounmap(&gpio_va); } module_init(first_drv_init); module_exit(first_drv_exit); MODULE_LICENSE("GPL");

2013-9-1 15:33:05 评论举报 jew900711