Tasklet API usage

#include<linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include<linux/fs.h>
#include<linux/slab.h>
#include<linux/timer.h>//timer_list
#include <linux/sched.h>//jiffies
#include <linux/list.h>//container_of
#include <linux/interrupt.h>


MODULE_AUTHOR("Tan xujia");
MODULE_LICENSE("Dual BSD/GPL");

DECLARE_WAIT_QUEUE_HEAD(wq);

struct tasklettest {
    
    struct tasklet_struct tsklt;;
    int count;
};

struct tasklettest *ttest;

void 
tasklet_fn(unsigned long data)
{
    
    printk("tasklet_fn\n");
    struct tasklettest *p =(struct tasklettest*)data;
    if (--(p->count)) {
    
        tasklet_hi_schedule(&p->tsklt);
        //tasklet_schedule(&p->tsklt);
    } else {
    
        //tasklet_kill(&ttest->tsklt);, There will be problems with this here 
        wake_up_interruptible(&wq);// Wake up the 
        printk("wait up\n");
    }
}

static
int __init hello_init (void)
{
    
    printk("hello_init\n");
    ttest = (struct tasklettest *)kzalloc(sizeof(*ttest), GFP_KERNEL);
    ttest->count = 10;
    tasklet_init(&ttest->tsklt, tasklet_fn, (unsigned long)ttest);
    tasklet_hi_schedule(&ttest->tsklt);
    //tasklet_schedule(&ttest->tsklt);
    wait_event_interruptible(wq, !ttest->count);// Wait until the conditions are met , The program continues 
    printk("wait event\n");   
    tasklet_kill(&ttest->tsklt);
    return 0;
}

static
void __exit hello_exit (void)
{
    
    //tasklet_kill(&ttest->tsklt);
    kfree(ttest);
    printk("hello_exit\n");
}

module_init(hello_init);
module_exit(hello_exit);

KERNELDIR ?= /lib/modules/$(shell uname -r)/build
PWD       := $(shell pwd)

obj-m	:=tasklet.o

all:
	make -C $(KERNELDIR) M=$(PWD) modules

clean:
	rm -rf *.o *~ core .depend .*.cmd *.ko *.mod.* .tmp_versions *.mod *.order *.symvers *.dwo