On 11/04/2019 09:03:05-0700, Guenter Roeck wrote: > Hi Alexandre, > > On Thu, Apr 11, 2019 at 05:36:46PM +0200, Alexandre Belloni wrote: > > Readout the enabled state so it is possible to get the pre-userspace > > handler working. Also, avoid disabling the watchdog when nowayout is set to > > ensure the watchdog continues working and triggers if there is an issue > > later in the boot or if userspace fails to start. > > > > Signed-off-by: Alexandre Belloni <alexandre.belloni@xxxxxxxxxxx> > > --- > > drivers/watchdog/pnx4008_wdt.c | 6 +++++- > > 1 file changed, 5 insertions(+), 1 deletion(-) > > > > diff --git a/drivers/watchdog/pnx4008_wdt.c b/drivers/watchdog/pnx4008_wdt.c > > index 8e261799c84e..9e3714e3814c 100644 > > --- a/drivers/watchdog/pnx4008_wdt.c > > +++ b/drivers/watchdog/pnx4008_wdt.c > > @@ -209,7 +209,11 @@ static int pnx4008_wdt_probe(struct platform_device *pdev) > > watchdog_set_nowayout(&pnx4008_wdd, nowayout); > > watchdog_set_restart_priority(&pnx4008_wdd, 128); > > > > - pnx4008_wdt_stop(&pnx4008_wdd); /* disable for now */ > > + if (readl(WDTIM_CTRL(wdt_base)) & COUNT_ENAB) > > + set_bit(WDOG_HW_RUNNING, &pnx4008_wdd.status); > > + > > + if (!nowayout) > > + pnx4008_wdt_stop(&pnx4008_wdd); /* disable for now */ > > I don't see the point of stopping the watchdog here, even though that is the > old behavior. If it is possible to detect that the watchdog is running, we > can let the core handle pings until the watchdog device is opened. The code > above does that, but only if nowayout is set. That seems inconsistent and > unnecessary. Is there a downside to doing that unconditionally ? > I guess the downside is the change of behaviour. I don't think many will be affected but they will have to ensure the core pings the watchdog until the device is open. WATCHDOG_HANDLE_BOOT_ENABLED is y by default so that should be fine for most. Honestly, I would just never disable the watchdog, that is the whole point of this patch. If you are fine with that, I will just remove the line. > Nitpick: s/watchddog/watchdog/ in subject line. > I'll fix it. -- Alexandre Belloni, Bootlin Embedded Linux and Kernel engineering https://bootlin.com
