Re: [PATCH v4 04/11] watchdog: add support for sl28cpld watchdog

[Andy Shevchenko <andy.shevchenko@gmail.com>]

On Fri, Jun 5, 2020 at 1:24 PM Michael Walle <michael@walle.cc> wrote:
> Am 2020-06-05 10:14, schrieb Andy Shevchenko:
> > On Fri, Jun 5, 2020 at 12:14 AM Michael Walle <michael@walle.cc> wrote:

...

> >> +static bool nowayout = WATCHDOG_NOWAYOUT;
> >> +module_param(nowayout, bool, 0);
> >> +MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started
> >> (default="
> >> +                               __MODULE_STRING(WATCHDOG_NOWAYOUT)
> >> ")");
> >> +
> >> +static int timeout;
> >> +module_param(timeout, int, 0);
> >> +MODULE_PARM_DESC(timeout, "Initial watchdog timeout in seconds");
> >
> > Guenter ACKed this, but I'm wondering why we still need module
> > parameters...
>
> How would a user change the nowayout or the timeout? For the latter
> there is
> a device tree entry, but thats not easy changable by the user.

Yes, it's more question to VIm and Guenter than to you.

...

> >> +       if (status & WDT_CTRL_EN) {
> >> +               sl28cpld_wdt_start(wdd);
> >
> >> +               set_bit(WDOG_HW_RUNNING, &wdd->status);
> >
> > Do you need atomic op here? Why?
>
> I'd say consistency, all watchdog drivers do it like that. I just
> had a look at where this is used, but it looks like access from
> userspace is protected by a lock.

Okay then.

-- 
With Best Regards,
Andy Shevchenko