From: Guenter Roeck <linux@roeck-us.net>
To: Wolfram Sang <wsa@the-dreams.de>
Cc: Jerry Hoemann <jerry.hoemann@hpe.com>,
Wolfram Sang <wsa+renesas@sang-engineering.com>,
linux-watchdog@vger.kernel.org,
linux-renesas-soc@vger.kernel.org,
Wim Van Sebroeck <wim@linux-watchdog.org>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2 06/16] watchdog: hpwdt: drop warning after calling watchdog_init_timeout
Date: Tue, 16 Apr 2019 14:14:13 -0700 [thread overview]
Message-ID: <20190416211413.GB26442@roeck-us.net> (raw)
In-Reply-To: <20190416205003.GA8268@kunai>
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
next prev parent reply other threads:[~2019-04-16 21:14 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-16 10:24 [PATCH v2 00/16] watchdog: refactor init_timeout and update users Wolfram Sang
2019-04-16 10:25 ` [PATCH v2 01/16] watchdog: refactor watchdog_init_timeout Wolfram Sang
2019-04-16 13:23 ` Guenter Roeck
2019-04-16 10:25 ` [PATCH v2 02/16] watchdog: add error messages when initializing timeout fails Wolfram Sang
2019-04-16 10:25 ` [PATCH v2 03/16] watchdog: cadence_wdt: drop warning after calling watchdog_init_timeout Wolfram Sang
2019-04-16 10:25 ` [PATCH v2 04/16] watchdog: cadence_wdt: still probe if user supplied timeout is invalid Wolfram Sang
2019-04-16 10:25 ` [PATCH v2 05/16] watchdog: ebc-c384_wdt: drop warning after calling watchdog_init_timeout Wolfram Sang
2019-04-16 10:28 ` William Breathitt Gray
2019-04-16 10:25 ` [PATCH v2 06/16] watchdog: hpwdt: " Wolfram Sang
2019-04-16 20:34 ` Jerry Hoemann
2019-04-16 20:48 ` Guenter Roeck
2019-04-16 20:55 ` Wolfram Sang
2019-04-16 21:20 ` Guenter Roeck
2019-04-16 22:17 ` Wolfram Sang
2019-04-16 22:38 ` Guenter Roeck
2019-04-17 19:45 ` Wolfram Sang
2019-04-17 20:17 ` Guenter Roeck
2019-04-17 21:18 ` Wolfram Sang
2019-04-17 22:00 ` Guenter Roeck
2019-04-24 8:38 ` Geert Uytterhoeven
2019-04-24 12:57 ` Guenter Roeck
2019-04-16 20:50 ` Wolfram Sang
2019-04-16 21:14 ` Guenter Roeck [this message]
2019-04-16 10:25 ` [PATCH v2 07/16] watchdog: i6300esb: " Wolfram Sang
2019-04-16 10:25 ` [PATCH v2 08/16] watchdog: imx_sc_wdt: " Wolfram Sang
2019-04-16 10:25 ` [PATCH v2 09/16] watchdog: ni903x_wdt: " Wolfram Sang
2019-04-16 10:25 ` [PATCH v2 10/16] watchdog: nic7018_wdt: " Wolfram Sang
2019-04-16 10:25 ` [PATCH v2 11/16] watchdog: renesas_wdt: " Wolfram Sang
2019-04-16 10:25 ` [PATCH v2 12/16] watchdog: sp5100_tco: " Wolfram Sang
2019-04-16 10:25 ` [PATCH v2 13/16] watchdog: st_lpc_wdt: " Wolfram Sang
2019-04-16 10:25 ` [PATCH v2 14/16] watchdog: stm32_iwdg: " Wolfram Sang
2019-04-16 10:25 ` [PATCH v2 15/16] watchdog: xen_wdt: " Wolfram Sang
2019-04-16 10:25 ` [PATCH v2 16/16] watchdog: ziirave_wdt: " Wolfram Sang
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20190416211413.GB26442@roeck-us.net \
--to=linux@roeck-us.net \
--cc=jerry.hoemann@hpe.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-renesas-soc@vger.kernel.org \
--cc=linux-watchdog@vger.kernel.org \
--cc=wim@linux-watchdog.org \
--cc=wsa+renesas@sang-engineering.com \
--cc=wsa@the-dreams.de \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).