From: Thadeu Lima de Souza Cascardo <cascardo@holoscopio.com>
Date: Fri, 21 May 2010 15:16:12 +0000 (-0400)
Subject: Use tasklet to schedule printing our default greeting.
X-Git-Url: http://git.cascardo.eti.br/?p=cascardo%2Fkernel%2Fsamples%2Fchar2%2F.git;a=commitdiff_plain;h=refs%2Fheads%2Ftasklet

Use tasklet to schedule printing our default greeting.
---

diff --git a/hellochar.c b/hellochar.c
index d8adcf9..91e8d69 100644
--- 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);
 }