Re: [PATCH v2 06/16] watchdog: hpwdt: drop warning after calling watchdog_init_timeout

Guenter Roeck
2019-04-17T20:18:02Z

On Wed, Apr 17, 2019 at 09:45:28PM +0200, Wolfram Sang wrote:
>
> > Yes, that works as well. Note that it will actually print something like
> > "watchdog: <device>: ..." due to the pr_fmt() at the top of watchdog_core.c.
> > I guess that should be ok.
>
> I have the following diff applied on top of patch 2. Works with and
> without a parent device. I am not super happy casting 'identity' but
> since its u8-type is exported to userspace, I think we can't avoid it.
> Guenter, is this cast safe? Here is the diff:
>
I would think it is safe, but question is if it is it needed - ie do you see
a warning if it isn't there ? Presumably yes; if so, let's just do it.

Thanks,
Guenter

> diff --git a/drivers/watchdog/watchdog_core.c b/drivers/watchdog/watchdog_core.c
> index cd3ca6b366ef..62be9e52a4de 100644
> --- a/drivers/watchdog/watchdog_core.c
> +++ b/drivers/watchdog/watchdog_core.c
> @@ -115,6 +115,8 @@ static void watchdog_check_min_max_timeout(struct watchdog_device *wdd)
> int watchdog_init_timeout(struct watchdog_device *wdd,
> unsigned int timeout_parm, struct device *dev)
> {
> + const char *dev_str = wdd->parent ? dev_name(wdd->parent) :
> + (const char *)wdd->info->identity;
> unsigned int t = 0;
> int ret = 0;
>
> @@ -126,8 +128,8 @@ int watchdog_init_timeout(struct watchdog_device *wdd,
> wdd->timeout = timeout_parm;
> return 0;
> }
> - dev_err(dev, "driver supplied timeout (%u) out of range\n",
> - timeout_parm);
> + pr_err("%s: driver supplied timeout (%u) out of range\n",
> + dev_str, timeout_parm);
> ret = -EINVAL;
> }
>
> @@ -138,12 +140,13 @@ int watchdog_init_timeout(struct watchdog_device *wdd,
> wdd->timeout = t;
> return 0;
> }
> - dev_err(dev, "DT supplied timeout (%u) out of range\n", t);
> + pr_err("%s: DT supplied timeout (%u) out of range\n", dev_str, t);
> ret = -EINVAL;
> }
>
> if (ret < 0 && wdd->timeout)
> - dev_warn(dev, "falling back to default timeout (%u)\n", wdd->timeout);
> + pr_warn("%s: falling back to default timeout (%u)\n", dev_str,
> + wdd->timeout);
>
> return ret;
> }
>