bug: kernel timer added twice

[walking]

I tried to write a simple module where add_timer() was used to make the
kernel call my function after a time. The two simple source files are
listed (omit header file).

module.c as follows:
int init_module(void)
{
unsigned long timeout;
timeout=10;
my_timeout(timeout);
}

auto.c as follows:

void my_timeout(signed long timeout)
{
struct timer_list timer;
unsigned long expire;

expire = timeout +jiffies;

timer.expires=expire;
timer.data=0;
timer.function=autoprint;

add_timer(&timer);
}

void *autoprint(unsigned long data)
{
printk(KERN_DEBUG "hello world\n");
}

It passed compilation, but failed in execution. After I inserted the module, it said, "bug: kernel timer added twice". However, I just use add_timer() ONCE, so I am very confused. Could anyone give me any suggestion? Thanks a lot!

[afrolinux]

You do not have any hook funcions that could call add_timer countiunosly (before the had expired), So only possible way you get that message is if the timer have been set for long time enough allowing you to unload and load the module between.

I suggest you to do del/detach_timer in clean_module. And also to reboot your box toreset all timers your kernel had set up.


afrolinux

[walking]

You do not have any hook funcions that could call add_timer countiunosly (before the had expired), So only possible way you get that message is if the timer have been set for long time enough allowing you to unload and load the module between.

I suggest you to do del/detach_timer in clean_module. And also to reboot your box toreset all timers your kernel had set up.


afrolinux

Thanks a lot. Got it.