Re: [PATCH v2 2/3] watchdog: sama5d4: Fix setting timeout when watchdog is disabled

[Guenter Roeck]

On 02/19/2017 03:52 PM, Alexandre Belloni wrote:
> On 19/02/2017 at 08:57:35 -0800, Guenter Roeck wrote:
> > > > That means if the watchdog is running, the timeout would not be updated.
> > > > It should be updated no matter if it is running or not.
> > >
> > > No, it is enabling the watchdog, then changing WDV and WDD and finally
> > > disabling the watchdog if necessary. So, WDV and WDD are always changed.
> > You are correct. Sorry for the noise.
> >
> > Seems odd that the watchdog must be _running_ to change the timeout.
> > Usually, if there is a restriction, it is the opposite. I hope this
> > doesn't cause race conditions, where the watchdog fires immediately
> > after being enabled due to a low timeout.
>
> While it is difficult to reproduce, I can confirm it races and sometimes
> reset the SoC without any good reason. It doesn't matter whether it is
> disabled or not

Outch :-(.

> I've raised the issue at Atmel last Thursday so I don't have any answer
> yet.

Please keep us in the loop.

Thanks,
Guenter