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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
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

  reply index

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

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