Hi,

On Tue, Jul 14, 2015 at 09:42:39AM +0800, Jun Nie wrote:
> 2015-07-13 20:00 GMT+08:00 Sebastian Reichel <sre@kernel.org>:
> > On Mon, Jul 06, 2015 at 04:35:30PM +0800, Jun Nie wrote:
> >> Register with kernel restart handler instead of setting arm_pm_restart
> >> directly.
> >>
> >> [...]
> >>
> >> +static int zx_restart_handler(struct notifier_block *this,
> >> +                           unsigned long mode, void *cmd)
> >> +{
> >> +     writel_relaxed(1, base + 0xb0);
> >> +     writel_relaxed(1, pcu_base + 0x34);
> >> +
> >> +     while (1)
> >> +             cpu_do_idle();
> >
> > mdelay(some_time);
> > pr_emerg("Unable to restart system\n");
> 
> I do not think these code can be executed as reset will happen after
> register writing and while loop will stop any further code execution.
> Please point out issue if any.

Please remove the while loop. Instead wait for a reasonable amount
of time. If something goes wrong print an error message and return
NOTIFY_DONE. You can see an example in syscon-reboot.c

-- Sebastian