From: Guenter Roeck <linux@roeck-us.net>
To: Geert Uytterhoeven <geert@linux-m68k.org>,
Wolfram Sang <wsa@the-dreams.de>
Cc: Jerry Hoemann <jerry.hoemann@hpe.com>,
Wolfram Sang <wsa+renesas@sang-engineering.com>,
Linux Watchdog Mailing List <linux-watchdog@vger.kernel.org>,
Linux-Renesas <linux-renesas-soc@vger.kernel.org>,
Wim Van Sebroeck <wim@linux-watchdog.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v2 06/16] watchdog: hpwdt: drop warning after calling watchdog_init_timeout
Date: Wed, 24 Apr 2019 05:57:38 -0700 [thread overview]
Message-ID: <54286f3b-98f7-1b7c-8768-2c88ef73e9af@roeck-us.net> (raw)
In-Reply-To: <CAMuHMdVuZH86bOBsymuPj+68o+exAtao9509XUjoXkozyi1Hvg@mail.gmail.com>
On 4/24/19 1:38 AM, Geert Uytterhoeven wrote:
> Hi Wolfram,
>
> On Wed, Apr 17, 2019 at 9:46 PM Wolfram Sang <wsa@the-dreams.de> 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:
>>
>> 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;
>
> struct watchdog_info {
> ...
> __u8 identity[32]; /* Identity of the board */
> };
>
> Is identity[] guaranteed to be NUL-terminated?
>
I would hope so, because we export its contents via sysfs to userspace
with
return sprintf(buf, "%s\n", wdd->info->identity);
Also, there are already several pr_err() assuming that it is
a string,
Guenter
next prev parent reply other threads:[~2019-04-24 12:57 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 [this message]
2019-04-16 20:50 ` Wolfram Sang
2019-04-16 21:14 ` Guenter Roeck
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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