On Sat, Jan 3, 2009 at 6:20 PM, Microbit_Ubuntu
<microbit@xxxxxxxxxxxxxxxxxxxxxx> wrote:
> Hello all,
>
> I've just joined up with this list, so this is mainly an initial "ping"
> to see if I can post.
> I'm a newbie studying embedded linux on an Olimex SAM9-L9260 target,
> cross compiling on Ubuntu 8.10.
>
> Eventually I'd like to ask a couple of questions. On the subject of
> timer INTs, I actually just got timer callbacks going in this sort of
> newbie handler approach :
>
> static void timer_fire(unsigned long data)
> {
> mod_timer(&timer_ticktock, jiffies + (timer_tick*HZ));
> printk ("Timer fired at %lu jiffies\n",jiffies);
> }
>
since u used mod_timer(), did u also use del_timer() to delete the
timer in your exit module code?
(check for example, drivers/char/synclinkmp.c:shutdown() routine).
but from kernel/timer.c these are the API for xxx_timer():
EXPORT_SYMBOL(init_timer);
EXPORT_SYMBOL(init_timer_deferrable);
EXPORT_SYMBOL(__mod_timer);
EXPORT_SYMBOL(mod_timer);
EXPORT_SYMBOL(del_timer);
EXPORT_SYMBOL(try_to_del_timer_sync);
EXPORT_SYMBOL(del_timer_sync);
so it seemed there is another del_timer_sync(), or
try_to_del_timer_sync()....search the drivers subdirectory for
examples....i am not sure of the differences among these.
> All works perfect, but *very* occasionally upon unregistering (rmmod)
> the module I'll get a segmentation fault.
> I've tried with protecting the module exit code, but still seems to be a
> snag. I'll provide better detail when I post properly.
>
> I hope this post pings OK - this looks to be a great list.
>
>
> Best regards,
> Kris
>
>
>
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>
--
Regards,
Peter Teoh
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