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From: Guenter Roeck <linux@roeck-us.net>
To: Fabio Estevam <festevam@gmail.com>
Cc: wim@linux-watchdog.org, linux-watchdog@vger.kernel.org,
	Yongcai Huang <Anson.Huang@nxp.com>,
	Shawn Guo <shawnguo@kernel.org>,
	NXP Linux Team <linux-imx@nxp.com>,
	Sascha Hauer <kernel@pengutronix.de>
Subject: Re: [PATCH 1/5] watchdog: imx7ulp: Fix reboot hang
Date: Mon, 4 Nov 2019 06:06:45 -0800
Message-ID: <69c3f4b9-6ca5-f44d-0ebc-d6fac368ec45@roeck-us.net> (raw)
In-Reply-To: <CAOMZO5AvCHo6pOfX32Bz-r8AjmbuqFWc5YUho9S1Gz8Tdo2SBA@mail.gmail.com>

On 11/4/19 5:45 AM, Fabio Estevam wrote:
> Hi Guenter,
> 
> On Sat, Nov 2, 2019 at 12:36 PM Guenter Roeck <linux@roeck-us.net> wrote:
>>
>> On Tue, Oct 29, 2019 at 02:40:33PM -0300, Fabio Estevam wrote:
>>> The following hang is observed when a 'reboot' command is issued:
>>>
>>> # reboot
>>> # Stopping network: OK
>>> Stopping klogd: OK
>>> Stopping syslogd: OK
>>> umount: devtmpfs busy - remounted read-only
>>> [    8.612079] EXT4-fs (mmcblk0p2): re-mounted. Opts: (null)
>>> The system is going down NOW!
>>> Sent SIGTERM to all processes
>>> Sent SIGKILL to all processes
>>> Requesting system reboot
>>> [   10.694753] reboot: Restarting system
>>> [   11.699008] Reboot failed -- System halted
>>>
>>> Fix this problem by adding a .restart ops member.
>>>
>>> Fixes: 41b630f41bf7 ("watchdog: Add i.MX7ULP watchdog support")
>>> Signed-off-by: Fabio Estevam <festevam@gmail.com>
>>
>> Reviewed-by: Guenter Roeck <linux@roeck-us.net>
>>
>> However, just to be sure: This registers the watchdog based restart handler
>> as restart handler of last resort. I assume this on purpose, I just want
>> to make sure it is intentional since it is not explicitly mentioned in
>> the commit message.
> 
> To be honest, I thought that registering the restart handler was mandatory.
> 
Maybe I should have said "there is no call to watchdog_set_restart_priority()".

> By the way, I have just noticed that even though this patch fixes the
> reboot on a imx7ulp evk board, it does not work on a imx7ulp com
> board.
> 
> I will debug this, so please discard this patch for now. The other
> ones of this series should be fine to apply.
> 

Thanks for the update.

Guenter

  reply index

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-29 17:40 Fabio Estevam
2019-10-29 17:40 ` [PATCH 2/5] watchdog: imx7ulp: Pass the wdog instance inimx7ulp_wdt_enable() Fabio Estevam
2019-11-02 15:37   ` Guenter Roeck
2019-10-29 17:40 ` [PATCH 3/5] watchdog: imx7ulp: Remove unused structure member Fabio Estevam
2019-11-02 15:39   ` Guenter Roeck
2019-10-29 17:40 ` [PATCH 4/5] watchdog: imx7ulp: Remove inline annotations Fabio Estevam
2019-11-02 15:39   ` Guenter Roeck
2019-10-29 17:40 ` [PATCH 5/5] watchdog: imx7ulp: Use definitions instead of magic values Fabio Estevam
2019-11-02 15:41   ` Guenter Roeck
2019-11-02 15:36 ` [PATCH 1/5] watchdog: imx7ulp: Fix reboot hang Guenter Roeck
2019-11-04 13:45   ` Fabio Estevam
2019-11-04 14:06     ` Guenter Roeck [this message]
2019-11-07 17:46       ` Fabio Estevam
2019-11-08 14:39         ` Guenter Roeck

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