blink driver power saving

The blink driver wakes up every jiffies which wastes power unnecessarily.
Using a notifier gives same effect. Also add ability to unload module.

Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
[ We should really just delete the whole thing. The blink driver is
  broken in many other ways too  -Linus ]
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 20 insertions, 2 deletions

diff --git a/drivers/misc/blink.c b/drivers/misc/blink.c
index 634431ce1184..97f7253ce2d3 100644
--- a/drivers/misc/blink.c
+++ b/drivers/misc/blink.c
@@ -16,12 +16,30 @@ static void do_blink(unsigned long data)
         add_timer(&blink_timer);
 }
 
-static int blink_init(void)
+static int blink_panic_event(struct notifier_block *blk,
+                             unsigned long event, void *arg)
 {
-        printk(KERN_INFO "Enabling keyboard blinking\n");
         do_blink(0);
         return 0;
 }
 
+static struct notifier_block blink_notify = {
+        .notifier_call = blink_panic_event,
+};
+
+static __init int blink_init(void)
+{
+        printk(KERN_INFO "Enabling keyboard blinking\n");
+        atomic_notifier_chain_register(&panic_notifier_list, &blink_notify);
+        return 0;
+}
+
+static __exit void blink_remove(void)
+{
+        del_timer_sync(&blink_timer);
+        atomic_notifier_chain_unregister(&panic_notifier_list, &blink_notify);
+}
+
 module_init(blink_init);
+module_exit(blink_remove);