Use tasklet to schedule printing our default greeting.

diff --git a/hellochar.c b/hellochar.c
index d8adcf9..91e8d69 100644 (file)
--- a/hellochar.c
+++ b/hellochar.c
@@ -21,7 +21,7 @@
 #include <linux/cdev.h>
 #include <linux/slab.h>
 #include <linux/spinlock.h>
-#include <linux/timer.h>
+#include <linux/interrupt.h>
 
 MODULE_LICENSE("GPL");
 
@@ -41,14 +41,13 @@ static void hello_world(unsigned long greeting)
        printk(KERN_INFO "%s", (char *) greeting);
 }
 
-static DEFINE_TIMER(hello_timer, hello_world, 0, def_greeting);
+static DECLARE_TASKLET(hello_tasklet, hello_world, def_greeting);
 
 static ssize_t hello_read(struct file *fp, char __user *buf, size_t sz,
        loff_t *pos)
 {
-       printk(KERN_INFO "Adding timer...\n");
-       hello_timer.expires = jiffies + 5 * HZ;
-       add_timer(&hello_timer);
+       printk(KERN_INFO "Scheduling tasklet...\n");
+       tasklet_schedule(&hello_tasklet);
        return 0;
 }
 
@@ -98,7 +97,7 @@ reg_out:
 
 static void __exit ch_exit(void)
 {
-       del_timer_sync(&hello_timer);
+       tasklet_kill(&hello_tasklet);
        cdev_del(dev);
        unregister_chrdev_region(devnum, 256);
 }