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proper cleanup

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This commit is contained in:
twoneis 2025-03-27 17:16:15 +01:00
parent cf4111b64d
commit 232cd71f5d
1 changed files with 11 additions and 1 deletions
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12
code/lkm.c
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@ -28,8 +28,8 @@ static struct file_operations lkm_fops = {
static int static int
lkm_init(void) lkm_init(void)
{ {
int ret;
printk(KERN_INFO "lkm: init: start\n"); printk(KERN_INFO "lkm: init: start\n");
int ret;
ret = register_chrdev(0, DEVICE_NAME, &lkm_fops); ret = register_chrdev(0, DEVICE_NAME, &lkm_fops);
if (ret < 0) { if (ret < 0) {
@ -69,12 +69,20 @@ static void
lkm_exit(void) lkm_exit(void)
{ {
printk(KERN_INFO "lkm: exit: start\n"); printk(KERN_INFO "lkm: exit: start\n");
device_destroy(lkm_class, MKDEV(lkm_major, 0));
class_unregister(lkm_class);
unregister_chrdev(lkm_major, DEVICE_NAME);
printk(KERN_INFO "lkm: exit: done\n")
} }
int int
lkm_open(struct inode *inode, struct file *fp) lkm_open(struct inode *inode, struct file *fp)
{ {
printk(KERN_INFO "lkm: open: start\n"); printk(KERN_INFO "lkm: open: start\n");
printk(KERN_INFO "lkm: open: done\n");
return 0; return 0;
} }
@ -82,6 +90,7 @@ int
lkm_release(struct inode *inode, struct file *fp) lkm_release(struct inode *inode, struct file *fp)
{ {
printk(KERN_INFO "lkm: release: start\n"); printk(KERN_INFO "lkm: release: start\n");
printk(KERN_INFO "lkm: release: done\n");
return 0; return 0;
} }
@ -89,6 +98,7 @@ long
lkm_ioctl(struct file *fp, unsigned num, long unsigned int param) lkm_ioctl(struct file *fp, unsigned num, long unsigned int param)
{ {
printk(KERN_INFO "lkm: release: start\n"); printk(KERN_INFO "lkm: release: start\n");
printk(KERN_INFO "lkm: release: done\n");
return 0; return 0;
} }