On Tue, Apr 16, 2019 at 10:50:03PM +0200, Wolfram Sang wrote: > Hi Jerry, > > > I applied patches 1,2 & 6 in testing. > > > > Note, that hpwdt is passing NULL as the third parameter to watchdog_init_timeout(). > > > > The second patch in this series is using "dev" as input to dev_err and dev_warn. > > > > This results in the following in dmesg when trying to load hpwdt w/ an invalid soft_margin: > > > > > > [ 80.848160] (NULL device *): driver supplied timeout (4294967295) out of range > > [ 80.855429] (NULL device *): falling back to default timeout (30) > > Thank you for this report. Yes, using 'dev' blindly is a bug. > > > if the call in hpwdt driver is changed to: > > > > if (watchdog_init_timeout(&hpwdt_dev, soft_margin, &dev->dev)) > > > > > > We see the message like we'd desire: > > > > [ 2061.167100] hpwdt 0000:01:00.0: driver supplied timeout (4294967295) out of range > > [ 2061.174633] hpwdt 0000:01:00.0: falling back to default timeout (30) > > The above observation makes sense, but I think we should fix the core > code and not the hpwdt driver. My suggestion would be to add something > like this to watchdog_init_timeout(): > > struct device *err_dev = dev ?: wdd->parent; > > And then use err_dev for all the printing. Guenter? > That is a good idea, and we should do that. Unfortunately, wdd->parent can also be NULL, either because there is no parent device (e.g. softdog.c), or because the driver author forgot to set ->parent. So we still need a fallback. Does it make sense to print watchdog_info->identity if both dev and wdd->parent are NULL ? Guenter
